Method for detecting fluidity of slag in coal gasifier

A detection method and fluidity technology are applied in the detection field of slag fluidity in coal gasification furnaces to achieve the effects of improving measurement accuracy, performance and spatial resolution

Active Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many difficulties in detecting the fluidity of slag in the gasifier, and the conditions above and in the slag pool are relatively mild

Method used

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  • Method for detecting fluidity of slag in coal gasifier
  • Method for detecting fluidity of slag in coal gasifier
  • Method for detecting fluidity of slag in coal gasifier

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Such as figure 1 As shown, the structure of the lower part of the coal gasification device in this embodiment includes a pressure shell 1, a gasification chamber surrounded by a gasifier wall 2, a converging wall 3 at the bottom of the gasifier wall, a slag screen 4, a spray ring 5, Slag pond 6, lower slag outlet 7, spray water 9, slag pond liquid level 10. After the molten slag 8 comes out from the lower slag port 7, it falls freely under the action of gravity, falls into the slag pool 6, and quickly (cools) decomposes into dense glass-like small particles and flows downward into the slag pool at the bottom of the gasifier 6. Discharge after being crushed by a slag breaker. In order to remove the heat generated by solidification and cooling of the molten slag, the gray water in the slag pool 6 circulates in the slag pool 6 and is injected through the spray ring 5 on the slag pool 6 after being cooled by an external cooler. A large number of sounds will be emitted dur...

Embodiment 2

[0078] The experimental device of this embodiment is as figure 2 Shown, the difference with embodiment 1 is: 1, adopt such as figure 2 The arrangement of the acoustic wave receiving device shown in the figure: one end of the probe 11 is welded on the wall of the slag pool 6 and the wall of the slag screen 4, and the other end passes through the pressure shell 1 to connect the acoustic wave sensor 12, and is uniformly arranged in the circumferential direction in the slag pool 6 4 sets of acoustic wave sensors 12 and probes 11, 2 sets of acoustic wave sensors 12 and probes 11 are evenly arranged circumferentially above the slag pool 6;

[0079] 2. In this embodiment, an acceleration sensor is used to collect acoustic signals. The frequency response range of the acceleration sensor is 1-30KHz, the system sampling frequency is 200KHz, and the sampling time is 30s;

[0080] 3. Use E as a characteristic parameter to establish a prediction model. Other implementations are the sam...

Embodiment 3

[0082] The experimental device of this embodiment is as image 3 As shown, the difference from Example 1 is: using such as image 3 In the arrangement shown, no probe is used, the acoustic wave sensor 12 is directly attached to the outer wall surface of the slag pool 6 and the slag screen 4, and multiple acoustic wave sensors are respectively arranged above the slag pool and the slag pool. Other implementations are the same as in Example 1. The measured value F of the finally obtained slag fluidity index is 10.16, and the actual value F 0 is 10.08, and the relative deviation B is 0.79%.

[0083] In Example 1, Example 2 and Example 3, the viscosity of the molten slag can be controlled within ±5% of the target value, effectively avoiding the occurrence of slag plugging.

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Abstract

The invention discloses a method for detecting fluidity of slag in a coal gasifier. The method comprises the following steps of: acquiring a sound wave signal; preprocessing the sound wave signal; extracting feature parameters of the sound wave signal; building a prediction model; and detecting the fluidity of the slag. The method for detecting the fluidity of the slag in the coal gasifier by combining an acoustic emission sensor or an acceleration sensor and a wave guiding rod has the characteristics of stability, safety, environmental friendliness and the like, and is applicable to on-line detection of an industrial production process; a sound wave receiving device array is adopted, and measurement accuracy is improved by multi-sensor data fusion; and on-line detection of the fluidity of the slag is realized by a slag fluidity index number detecting technology based on sound wave detection. Compared with the prior art, the method is sensitive and is high in detection accuracy; and early warning of slag blockage is realized by a slag blockage early warning and control technology based on slag fluidity index number detection, the viscosity of the slag can be controlled within a range above or below an objective value by 5%, and the slag blockage is effectively avoided.

Description

technical field [0001] The invention relates to a method for detecting, early warning and controlling slag blocking of slag fluidity in a coal gasifier, in particular to a detection method for slag fluidity in a coal gasifier. Background technique [0002] Slagging is one of the ubiquitous problems in dry pulverized coal gasification process. Taking the Shell pulverized coal gasification process as an example, there are mainly two forms of slag plugging: lower slag port plugging and slag pool shelf slag. When the furnace temperature is low, the flow ability of molten slag becomes poor, and the slag layer gradually accumulates near the converging wall and the slag mouth and becomes thicker or even solidified, resulting in slag plugging at the slag mouth; The upper slag layer may peel off from the furnace, and slag will be placed in the lower slag mouth, so that the molten slag will continue to accumulate near the lower slag mouth, and finally cause the slag mouth to block th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
Inventor 黄正梁盛新王靖岱黄晓华赵锦波汪永庆何乐路张传玉阳永荣潘功胜
Owner CHINA PETROLEUM & CHEM CORP
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