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Biomass solid fuel ash high-temperature melting monitoring device based on capacitance measurement

A technology of high-temperature melting and solid fuel, applied in the direction of material capacitance, etc., can solve the problems of difficult to monitor accurately and take preventive measures in time, and achieve the effect of convenient operation and simple structure

Active Publication Date: 2015-04-08
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above methods are difficult to timely and accurately monitor the occurrence and development of ash melting in the process of biomass gasification and combustion, so it is difficult to take preventive measures in time

Method used

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  • Biomass solid fuel ash high-temperature melting monitoring device based on capacitance measurement
  • Biomass solid fuel ash high-temperature melting monitoring device based on capacitance measurement
  • Biomass solid fuel ash high-temperature melting monitoring device based on capacitance measurement

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Embodiment 1

[0028] figure 1 Shown is a schematic diagram of the structure of the ash melting capacitance testing experimental device, which is mainly composed of a pair of capacitor plates 1 and 2, an ash melting container 3 made of corundum, and an electric heating jacket 4. The capacitor plates 1 and 2 are connected to a capacitance tester 5. For the convenience of measurement and the improvement of accuracy, the change of capacitance before and after melting is designed to be greater than 10PF. Refer to the calculation method of parallel plate capacitance, and the reference value of dielectric constant is 2-10. Load the biomass ash sample 6 (i.e. ash) in the ash melting container 3 and put the ash melting container 3 into the electric heating jacket 4, control the temperature rise through the electric heating program to make the temperature in the ash melting container 3 reach the melting point of the ash sample , the temperature of the ash melting container 3 is measured by a thermoco...

Embodiment 2

[0031] image 3 It is a structural diagram of a real-time capacitance monitoring device for biomass ash melting in the process of biomass gasification and combustion, taking the fixed-bed gasifier, which is widely used in industry, as an example. The biomass raw material enters the fixed-bed gasifier from the top of the furnace, and the carbon-containing ash produced after the gasification reaction is concentrated at the bottom of the furnace, and the air entering from the bottom of the furnace undergoes an oxidation reaction with carbon to release heat, forming a high-temperature melting zone at the bottom of the furnace. Due to the uneven temperature distribution of the fixed bed, even if the overall temperature is controlled below the ash melting point of the biomass, the local temperature is still easy to reach and exceed the ash melting point, causing local ash melting and sintering. Measures such as heating, the molten slag can grow, and the melting area is further expan...

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Abstract

The invention discloses a biomass solid fuel ash high-temperature melting monitoring device based on capacitance measurement. The biomass solid fuel ash high-temperature melting monitoring device comprises a capacitance plate group and a capacitance tester, wherein the capacitance plate group consists of two capacitance plates which are arranged oppositely, and a high-temperature melting area is arranged between the capacitance plate group; ash is arranged in the high-temperature melting area and used as a dielectric medium of the capacitance plate group; the capacitance tester is electrically connected with the capacitance plate group and used for monitoring a capacitance value of the capacitance plate group in real time and determining the melting time of the ash according to the dielectric constant before and after the melting of the ash. The ash is used as the dielectric medium of the capacitance plate group, the capacitance value of the capacitance plate group is changed due to the variation of the dielectric constant before and after the ash is molten, and the melting occurrence and development situation of the ash can be timely and accurately controlled and prevented by monitoring the capacitance value of the capacitance plate group in real time.

Description

technical field [0001] The invention relates to a high-temperature melting monitoring device for biomass solid fuel ash and slag based on capacitance measurement, in particular to monitoring the process and state of ash and slag melting when biomass is gasified and burned in a fixed-bed gasifier. Background technique [0002] Biomass, as an important renewable energy source, has been widely used in energy utilization such as gasification and combustion. Biomass solid fuel contains a certain amount of ash, which is a mixture of various minerals and has the characteristics of deformation, softening and melting at high temperatures. Due to the high content of alkali metals such as potassium and sodium in biomass ash, its ash melting point is low, and the ash melting problem has become one of the main problems restricting the utilization of biomass gasification combustion. Biomass is gasified and burned in the fixed-bed gasifier. When the temperature in the furnace reaches or e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22
Inventor 阴秀丽赖喜锐周肇秋袁洪友吴创之
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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