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CN-122006540-A - Biomass coal mixture with high biomass content and production equipment and method thereof

CN122006540ACN 122006540 ACN122006540 ACN 122006540ACN-122006540-A

Abstract

The invention relates to the technical field of biomass resource utilization, and particularly discloses a biomass coal mixture with high biomass content, and production equipment and method thereof. The production equipment comprises a hammer mill for crushing and drying biomass particles, a medium-speed coal mill for crushing and drying coal, a cloth bag dust remover and an induced draft fan connected with a gas outlet of the cloth bag dust remover, wherein a mixing pipe horizontally penetrates through the cloth bag dust remover, two end ports of the mixing pipe are respectively connected with a discharge port of the hammer mill and a discharge port of the medium-speed coal mill, the flow guide pipe is arranged in the cloth bag dust remover, the top end port of the flow guide pipe is communicated with the mixing pipe, and the bottom end port of the flow guide pipe faces the discharge port of the cloth bag dust remover. According to the invention, biomass particles and coal are respectively crushed to prepare the pulverized coal and biomass powder with high sphericity, small length-diameter ratio and better fluidity, so that the high-proportion mixing of biomass in the pulverized coal can be realized, and the pulverized coal with excellent fluidity can be utilized to drive the biomass powder with poor fluidity to enter the entrained-flow gasifier.

Inventors

  • TAN XUAN
  • DU SHAOHUA
  • YANG YANG
  • GUO XIAOLEI
  • LI HUANHUAN
  • WANG LEI

Assignees

  • 中国石油化工股份有限公司
  • 中安联合煤化有限责任公司
  • 华东理工大学

Dates

Publication Date
20260512
Application Date
20260305

Claims (10)

  1. 1. A production device of biomass coal mixture with high biomass content is characterized by comprising a hammer mill for crushing and drying biomass particles, a medium-speed coal mill for crushing and drying coal, a cloth bag dust remover and a draught fan connected with a gas outlet of the cloth bag dust remover, wherein a mixing pipe horizontally penetrates through the cloth bag dust remover, two end ports of the mixing pipe are respectively connected with discharge ports of the hammer mill and the medium-speed coal mill, the flow guide pipe is arranged in the cloth bag dust remover, the top end port of the flow guide pipe is communicated with the mixing pipe, and the bottom end port of the flow guide pipe faces to the discharge port of the cloth bag dust remover.
  2. 2. The production equipment of the biomass coal mixture with high biomass content according to claim 1, wherein the center of the mixing pipe is positioned on the central axis of the bag-type dust collector, and the top end port of the flow guide pipe is communicated with the center of the mixing pipe.
  3. 3. The production equipment of the biomass coal mixture with high biomass content according to claim 1, wherein the distance between the bottom end port of the guide pipe and the discharge port of the bag-type dust collector is 1-10m, and a level gauge is arranged in the bag-type dust collector.
  4. 4. The apparatus for producing a biomass coal mixture with high biomass content according to claim 1, wherein the apparent gas velocity in the mixing pipe is 5-25m/s and the apparent gas velocity in the draft tube is 1-10m/s.
  5. 5. A method for producing a biomass coal mixture with a high biomass content, characterized in that it uses the production apparatus as claimed in any one of claims 1 to 4, comprising the steps of: S1, adding centimeter-level biomass particles into a hammer mill, crushing to micrometer level, and drying to obtain dried biomass powder; s2, adding coal into a medium-speed coal mill, crushing to a micron level, and drying to obtain dried coal powder; S3, starting an induced draft fan, conveying the dried biomass powder and the dried coal powder into a mixing pipe by means of inert gas respectively, forming uniform mixed powder after the dried biomass powder and the dried coal powder are impacted in the mixing pipe, falling down along a flow guide pipe, flowing out from an outlet of the flow guide pipe, and finally settling at the cone bottom of a bag-type dust collector to obtain the biomass coal mixture.
  6. 6. The method for producing the biomass coal mixture with high biomass content according to claim 5, wherein in the step S1, the drying is realized by introducing 25-300 ℃ heat-loaded inert gas into a hammer mill, wherein the biomass particles are agriculture and forestry waste particles, and the agriculture and forestry waste is at least one of wheat straw, rice straw, cotton straw and corn straw.
  7. 7. The method of producing a high biomass content biomass coal mixture according to claim 5, wherein in step S1, the dry biomass powder has a particle size of <2000 μm, a moisture content of <15wt%, a sphericity of >0.4, and an aspect ratio of <4.
  8. 8. The method for producing a biomass coal mixture with high biomass content according to claim 5, wherein in step S2, the drying is performed by introducing 100-400 ℃ heat-loaded inert gas into a medium speed coal mill.
  9. 9. The method for producing a high biomass content biomass coal mixture according to claim 5, wherein in step S2, the particle size of the dry pulverized coal is <1000 μm and the moisture content is <10wt%.
  10. 10. A high biomass content biomass coal mixture, characterized in that it is produced by the production method according to any one of claims 5 to 9.

Description

Biomass coal mixture with high biomass content and production equipment and method thereof Technical Field The invention relates to the technical field of biomass resource utilization, in particular to a biomass coal mixture with high biomass content, and production equipment and method thereof. Background The modern coal chemical industry is one of industries with larger carbon emission in China. Biomass is the only renewable carbon source, a certain proportion of biomass is mixed with coal to form biomass-coal mixed powder which is used as an entrained flow gasification raw material, so that the carbon emission of a coal chemical device can be remarkably reduced, and the biomass-coal mixed powder is one of the important directions of carbon emission reduction of modern coal chemical enterprises. The biomass composition is complex, the fiber content is high, and the stable operation of the pneumatic conveying and feeding unit is not facilitated. The biomass is carbonized into coke by high-temperature pyrolysis in the prior art, and then enters a traditional roller mill to be mixed with coal dust for pulverizing. However, most of the volatile components of biomass are lost in the pyrolysis stage, and the energy loss is large and is not fully utilized. When the mixing proportion of biomass in the pulverized coal gasification device is small, biomass particles can also be directly fed into a roller mill to be mixed with pulverized coal for pulverizing. But industrial practice shows that on one hand, the flue gas temperature for drying the pulverized coal is up to 320 ℃, the mixing proportion of the particles is limited, otherwise, the pulverizing safety risk is high, on the other hand, wheat straw is taken as an example, and is ground in a roller mill together with the pulverized coal to prepare the powder, and the aspect ratio of the wheat straw particles is large (> 3) and the sphericity is low (< 0.4), so that the roller mill for preparing the pulverized coal is difficult to be suitable for preparing the biomass fine powder. Industrial practice shows that when the mixing proportion of biomass particles exceeds 15%, the powder feeding system starts to obviously generate the phenomenon of bucket-locking bridge arching, and the fluidity of mixed powder is poor. In conclusion, how to realize high-proportion mixing of biomass in pulverized coal and high-pressure feeding of biomass-coal mixed powder of high-proportion biomass, meets the requirement of entrained flow gasification raw material carbon reduction, and is a key technology of pulverized coal gasification technology of coupled biomass. Disclosure of Invention Based on the above, the invention aims to provide a biomass coal mixture with high biomass content, and production equipment and method thereof, so that high-proportion mixing of biomass in pulverized coal is realized, high-pressure feeding of biomass-coal mixed powder of the high-proportion biomass is realized, and the requirement of entrained flow gasification raw material carbon reduction is met. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention provides production equipment of biomass coal mixture with high biomass content, which comprises a hammer mill for crushing and drying biomass particles, a medium-speed coal mill for crushing and drying coal, a cloth bag dust remover and a draught fan connected with a gas outlet of the cloth bag dust remover, wherein a mixing pipe horizontally penetrates through the cloth bag dust remover, two end ports of the mixing pipe are respectively connected with discharge ports of the hammer mill and the medium-speed coal mill, the flow guide pipe is arranged in the cloth bag dust remover, the top end port of the flow guide pipe is communicated with the mixing pipe, and the bottom end port of the flow guide pipe faces to the discharge port of the cloth bag dust remover. According to the invention, under the action of the induced draft fan, coal dust and biomass powder respectively enter the mixing pipe from the ports at the two ends of the mixing pipe, the coal dust and biomass powder form uniform mixed powder after being impacted at the center of the bag-type dust collector, fall down along the draft pipe, flow out from the outlet of the draft pipe, finally settle at the cone bottom of the bag-type dust collector and are discharged from the outlet of the bag-type dust collector. According to the invention, the mixing pipe and the flow guide pipe are arranged in the bag-type dust remover, the dried biomass powder and the dried coal powder are firstly mixed in the mixing pipe and then are introduced into the bag-type dust remover through the flow guide pipe, so that segregation of the two powders due to differences of density, particle size and the like in the process of falling into the bag is prevented. As a further improvement of the scheme, the hammer mill is in a hammer type or blade type and is