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Method for removing tar from biomass thermal conversion gas-phase product

A biomass and conversion gas technology, applied in the direction of chemical instruments and methods, separation methods, removal of gas pollutants, etc., can solve problems such as hazards, electrostatic precipitator explosion, and separation effects that are difficult to achieve by conventional methods. The effect of strong applicability and simple structure

Inactive Publication Date: 2017-11-10
BEIJING FORESTRY UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

However, there will always be a small amount of uncondensed tar or tar tiny particles mixed in the gas phase product, if it is not removed, it will coke in the subsequent conveying equipment, pipeline network, stove or reactor using this non-condensable gas as raw material , causing great harm to
[0004] For the removal of tar, conventional gas-liquid separation methods such as cyclone separator, tower scrubber, wire screen liquid remover, and electrostatic decoker are generally used. However, since the pyrolysis gas contains flammable and explosive gases, the electrostatic precipitator may It will cause an explosion, and the tar particles are very small, so it is difficult to achieve the ideal separation effect by conventional methods

Method used

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  • Method for removing tar from biomass thermal conversion gas-phase product
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  • Method for removing tar from biomass thermal conversion gas-phase product

Examples

Experimental program
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Effect test

Embodiment 1

[0024] In a fluidized bed pyrolysis reactor with an annual processing capacity of 1,000 tons of biomass raw materials, the biomass quickly completes the pyrolysis process to form high-temperature gas-phase products and carbon powder. The high-temperature gas-phase products generated include liquid phases that can be condensed at room temperature Products and non-condensable non-condensable gas, high-temperature gas and carbon powder leave the reactor together with the fluidized gas entering the reactor. After gas-solid separation at high temperature to remove most of the carbon powder inside, after multi-stage condensation and cooling Separate the liquid phase product to obtain a non-condensable gas with a lower temperature and remove most of the tar. In this implementation, the gas phase product is cooled by low-temperature water, and the temperature can reach 20 ° C. A part of it is returned to the front of the reactor as fluidizing gas for preheating Part of the system is us...

Embodiment 2

[0028] In the rotary kiln pyrolysis reactor with a processing capacity of 1000 kg of biomass raw material per hour, the biomass completes the pyrolysis process under negative pressure (absolute pressure 30kPa), and the high-temperature gas phase products and carbon powder flow out of the reactor. After gas-solid separation at high temperature to remove most of the carbon powder inside, the liquid phase product is separated after multi-stage condensation and cooling to obtain a non-condensable gas with a lower temperature and most of the tar removed. In this implementation, the gas phase product After cooling with low-temperature water, the temperature can reach 20°C, and white smoke can still be observed in the gas phase product.

[0029] Introduce the method described in the present invention, as attached figure 2 As shown, the pyrolysis gas mixed with a small amount of tar from the condensation section is sprayed from the gas inlet 1 through the atomization pump 3 and the V...

Embodiment 3

[0032] In a fixed-bed carbonization reactor with a processing capacity of 1 kg of biomass raw material per hour, the biomass completes the thermal cracking process under a slight positive pressure (absolute pressure 2kPa), and forms a high-temperature gas phase product that flows out of the reactor and undergoes multi-stage condensation and cooling. Finally, the liquid phase product is separated to obtain a non-condensable gas with a lower temperature and most of the tar removed. In this implementation, the gas phase product is cooled with low-temperature water, and the temperature can reach 10 ° C. It can still be observed that there is yellowish white in the gas phase product. of soot.

[0033] Introduce the method described in the present invention, as attached image 3 As shown, the pyrolysis gas mixed with a small amount of tar from the condensation section is sprayed from the gas inlet 1 through the atomization pump 3 and the Venturi atomization nozzle 5. After atomizati...

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Abstract

The invention discloses a method for removing tar from a biomass thermal conversion gas-phase product. The method mainly comprises the two steps of fogging and separating. The technical scheme is characterized in that a circulation liquid is sprayed through a Venturi tube or a nozzle, and is in full contact with pyrolysis gas mingled with the tar, so that tar particles are enlarged and then separate gas and liquid in a cyclone separator, and the tar is prevented from coking in a subsequent pipeline and equipment. By means of the method, the risk of explosive gas explosion caused by static electricity tar removal is avoided, the whole process is simple in equipment and low in operation cost, and continuous and efficient operation can be achieved.

Description

technical field [0001] The invention relates to the technical field of biomass thermal conversion, in particular to a method for purifying and separating biomass rapid pyrolysis gas. Background technique [0002] With the shortage of petroleum, biomass has received extensive attention due to its advantages of large output, recyclability, and low pollution. The utilization of biomass resources can be effectively realized through thermal conversion, among which carbonization (conversion temperature is generally less than 500°C), rapid Pyrolysis (transformation temperature 450°C-700°C) and gasification (transformation temperature greater than 700°C) are the three main means of thermal conversion. With the different conditions such as the reaction temperature of each conversion means, the three phase products of gas, liquid and solid The yield and component distribution are also very different, and then the solid carbon, liquid phase product, and combustible gas with the highest...

Claims

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Application Information

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IPC IPC(8): C10K1/08C10K1/10C10K1/00B01D50/00
CPCB01D50/00C10K1/002C10K1/08C10K1/101B01D50/10B01D50/40B01D50/20B01D50/60
Inventor 杨晓晓李瑞操洪戚婷婷
Owner BEIJING FORESTRY UNIVERSITY
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