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Ultrasonic monitoring device, system and method for ash deposition and slagging of coal gasifier water-cooled wall

A monitoring device and monitoring system technology, applied in the direction of measuring devices, using ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of reduced heat transfer performance, reduced efficiency of coal gasifier, and affecting work safety, etc., to achieve low cost and avoid The phenomenon of dust accumulation and slagging, and the effect of ensuring safe operation

Pending Publication Date: 2021-04-09
BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ash accumulation and slagging on the water wall will cause many hazards, because the thermal conductivity of the ash is small, which will increase the heat conduction resistance on the water wall surface where the ash accumulates, reduce the heat transfer performance, cause the exhaust gas temperature to increase, and reduce the efficiency of the coal gasifier
The slagging and ash accumulation on the water wall will not only reduce the heat absorption of the furnace, but also increase the temperature of the flue gas at the outlet of the furnace, causing the temperature of the tube wall of the high-temperature superheater and reheater to rise, and in severe cases, it will cause slagging and affect other components. Safety at Work
In addition, when the heat absorption of the parallel tubes is seriously uneven due to slagging and ash accumulation on the water wall, it will also cause overheating and affect the safe operation of the coal gasifier

Method used

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  • Ultrasonic monitoring device, system and method for ash deposition and slagging of coal gasifier water-cooled wall
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  • Ultrasonic monitoring device, system and method for ash deposition and slagging of coal gasifier water-cooled wall

Examples

Experimental program
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Effect test

Embodiment 1

[0030] See attached figure 1 An ultrasonic monitoring device for ash accumulation and slagging on the water wall of a coal gasification furnace is installed in the coal gasification furnace. The monitoring device 1 includes: a waveguide 11 and an ultrasonic sensor 12 .

[0031] One end of the waveguide 11 passes through the outer wall 2 of the coal gasifier, and is attached to the inner wall of the water-cooled wall 3 of the coal gasifier; the waveguide 11 is fixed to the outer wall 2 by the first fixing device 13; the first fixing device 13 Ensure that one end surface of the waveguide 11 is flush with the inner wall surface of the water-cooled wall 3 to prevent the waveguide 11 from moving. In this example, the waveguide 11 is made of stainless steel. Stainless steel has a high temperature resistance of 800°C, can be used in high temperature environments, and has the characteristics of strong corrosion resistance, high toughness, and low sound attenuation. The shape of the ...

Embodiment 2

[0038] See attached figure 2 , 3 4. Ultrasonic monitoring system for ash accumulation and slagging on the water wall of coal gasifier, which uses the monitoring device 1 described in Embodiment 1. The monitoring device 1 is divided into 3 layers at equal intervals on the water wall 3, and each layer is surrounded by Four monitoring devices 1 are arranged in the direction; all monitoring devices 1 are connected with the computer 4 to form a monitoring system.

[0039] The ash accumulation and slagging of the water wall 3 vary with different heights, and the same height may also be different due to various factors. The 12 monitoring devices 1 are all connected to the computer 4 through data lines, and can realize online monitoring of the ash thickness of the entire coal gasifier.

Embodiment 3

[0041] Ultrasonic monitoring method for ash accumulation and slagging on the water wall of a coal gasifier, which uses the monitoring system described in Example 2. Since the monitoring system is arranged in three layers from top to bottom in the entire coal gasifier, each layer has 11 waveguides. The temperature is different, so to get the thickness value, the sound velocity at different temperatures must be obtained first. Establish the relationship between the temperature and the waveguide 11 and the sound velocity of the ash through experiments, and obtain the sound velocity under the temperature environment where the monitoring device 1 of each layer is located; use the formula to obtain the thickness of the ash:

[0042]

[0043] Wherein: d is the thickness of ash; t is the time when the ultrasonic sensor 12 receives the reflection signal from the bottom of the ash; h is the length of the waveguide 11; c 1 is the speed of sound in the waveguide 11; c 2 is the speed of ...

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Abstract

The invention discloses an online monitoring device, system and method for the ash deposition and slagging thickness of a water-cooled wall, and relates to the technical field of ultrasonic detection. The ultrasonic monitoring device for ash deposition and slagging of the coal gasifier water-cooled wall is installed in a coal gasifier and comprises a wave guide pipe and an ultrasonic sensor. One end of the wave guide pipe penetrates through the outer wall of the coal gasifier and is attached to the inner wall face of the water-cooled wall of the coal gasifier; the waveguide is fixed on the outer wall through a first fixing device; the other end of the waveguide is attached to an ultrasonic sensor, and the ultrasonic sensor is fixed to the waveguide through a second fixing device; and the ultrasonic sensor is in signal connection with a computer. The ash pollution degree of the water-cooled wall can be accurately monitored in real time, guidance is provided for ash blowing of the coal gasifier, the serious ash accumulation and slagging phenomenon in the operation process can be avoided, and safe operation of the coal gasifier is guaranteed.

Description

technical field [0001] The invention relates to the technical field of ultrasonic detection, in particular to an online monitoring device, system and method for the thickness of ash and slagging on a water wall. Background technique [0002] Fouling and slagging of water walls is a very common problem. Ash accumulation and slagging on the water wall will cause many hazards, because the thermal conductivity of the ash is small, which will increase the thermal resistance of the water wall surface where the ash accumulates, reduce the heat transfer performance, cause the exhaust gas temperature to increase, and reduce the efficiency of the coal gasifier. The slagging and ash accumulation on the water wall will not only reduce the heat absorption of the furnace, but also increase the temperature of the flue gas at the outlet of the furnace, causing the temperature of the tube wall of the high-temperature superheater and reheater to rise, and in severe cases, it will cause slaggi...

Claims

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Application Information

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IPC IPC(8): G01B17/02
CPCG01B17/02
Inventor 孙富韬孙海涛吴佳灵陈瑞典武东健李文峰刘溢孟祥军张晓菲卢超王阔传李小广
Owner BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH
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