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CN-121991725-A - System and method for preparing methanol based on coupling green hydrogen by biomass high-temperature gasification technology

CN121991725ACN 121991725 ACN121991725 ACN 121991725ACN-121991725-A

Abstract

The invention discloses a system and a method for preparing methanol based on biomass high-temperature gasification technology coupling green hydrogen, and relates to the field of methanol preparation, wherein the system is sequentially connected with a solid bulk material compressor, a high-temperature gasification furnace, a waste heat recovery boiler, a cloth bag dust remover and a modularized purifying device along a material flow; the outlet of the modularized purifying device is connected to the inlet of the gas proportioning system, the gas proportioning system is also provided with a hydrogen outlet for connecting a hydrogen storage tank, and the outlet of the gas proportioning system is connected to the inlet of the methanol synthesis reaction tower. According to the technical scheme, a methanol production system with high-temperature gasification of biomass and deep coupling of green hydrogen preparation is constructed, and efficient conversion of renewable resources and collaborative optimization of hydrocarbon elements are realized through system integration and process innovation.

Inventors

  • GUO HAO
  • CAI WEIQI

Assignees

  • 武汉中皓峻茂科技有限公司

Dates

Publication Date
20260508
Application Date
20260126

Claims (10)

  1. 1. System for preparing methanol based on biomass high-temperature gasification technology coupling green hydrogen, which is characterized in that the system is sequentially connected with: A discharge port of the solid bulk material compressor (1) is connected to a feed port of the high-temperature gasification furnace (2); the synthesis gas outlet of the high-temperature gasification furnace (2) is sequentially connected with a waste heat recovery boiler (5), a bag-type dust remover (7) and a modularized purifying device (9); the bottom ash outlet of the cloth bag dust collector (7) is connected to a return port of the high-temperature gasification furnace (2) through a return device (8); The outlet of the modularized purifying device (9) is connected to the inlet of the gas proportioning system (20); The gas proportioning system (20) is also provided with a hydrogen outlet for connecting a hydrogen storage tank (11), and the outlet of the hydrogen outlet is connected to the inlet of the methanol synthesis reaction tower (13); The outlet of the methanol synthesis reaction tower (13) is connected to the inlet of the gas-liquid separator (14); The liquid phase outlet of the gas-liquid separator (14) is connected to the inlet of the methanol rectifying tower (15), and the gas phase outlet of the gas-liquid separator is connected back to the inlet of the methanol synthesis reaction tower (13); The steam outlet of the high-temperature high-pressure steam generator (6) is connected to the steam inlet of the high-temperature gasification furnace (2), and the heat energy output end of the waste heat recovery boiler (5) provides a heat source for the high-temperature high-pressure steam generator (6).
  2. 2. The biomass high-temperature gasification technology coupling green hydrogen-based methanol preparation system according to claim 1, further comprising an air separation device (3) with an oxygen outlet connected to the gasifying agent (4) inlet of the high-temperature gasification furnace (2), and a green hydrogen supply system (10), wherein the green hydrogen supply system (10) outlet is connected to the hydrogen storage tank (11) inlet, and the methanol rectifying tower (15) outlet is connected to the methanol storage tank (12); The gas proportioning system (20) is configured to control the addition amount of hydrogen so that the molar ratio of H 2 to CO in the synthesis gas entering the methanol synthesis reaction tower (13) is 1:2.0-1:2.2, and the molar ratio of H 2 to CO 2 is 1:3.0-1:3.2.
  3. 3. The biomass high-temperature gasification technology coupling green hydrogen-based methanol preparation system according to claim 1, wherein the gas proportioning system (20) comprises a mixed gas conveying pipe (21) with one end communicated with an outlet of a modularized purification device (9) and the other end communicated with an inlet of a methanol synthesis reaction tower (13), and a first gas monitoring module, a primary mixing device (30), a second gas monitoring module and a secondary mixing device (40) which are sequentially arranged in the mixed gas conveying pipe (21) along a gas conveying direction; The primary mixing device (30) comprises a hydrogen storage tank (11) with an input end communicated with the hydrogen storage tank, a first hydrogen supply part (31) with an output end extending into the mixed gas conveying pipe (21), and an adder (32) arranged at the output end of the first hydrogen supply part (31); The secondary mixing device (40) comprises a flow dividing column (41) arranged in the mixed gas conveying pipe (21), a plurality of flow dividing holes (42) penetrating through the flow dividing column (41) and distributed in an annular array, two mixed gas conveying components (43) symmetrically arranged at two ends of the flow dividing column (41) and corresponding to the positions of the flow dividing holes (42), and a second hydrogen supply component (44) with an input end communicated with a hydrogen storage tank (11) and an output end extending into each flow dividing hole (42); The mixed gas conveying device further comprises a bending part (45) arranged at the end part of the mixed gas conveying pipe (21), and a power part (46) arranged on the outer wall of the bending part (45) and used for driving the mixed gas conveying part (43) to move.
  4. 4. A system for preparing methanol based on biomass high temperature gasification technology coupled with green hydrogen according to claim 3, wherein said first gas monitoring module comprises an infrared gas analyzer with a detection end extending into said mixed gas delivery tube (21) and a first thermal conductivity type hydrogen analyzer; the second gas monitoring module comprises a second thermal conductivity type hydrogen analyzer with a detection end extending into the mixed gas conveying pipe (21).
  5. 5. The biomass-based high temperature gasification technology coupled green hydrogen methanol production system according to claim 3, wherein the adder (32) comprises an input pipe (321), a plurality of first (322), second (323) and third (324) risers disposed on the outer wall of the input pipe (321) in a circular array, and gas nozzles (325) disposed at the ends of the first (322), second (323) and third (324) risers; The first vertical pipe (322), the second vertical pipe (323) and the third vertical pipe (324) are sequentially arranged along the airflow direction, and the heights of the first vertical pipe (322), the second vertical pipe (323) and the third vertical pipe (324) are sequentially increased.
  6. 6. The biomass high temperature gasification technology coupling green hydrogen based methanol production system according to claim 5, wherein the first hydrogen supply unit (31) comprises a first gas source tube (311) with one end connected to the exhaust end of the hydrogen storage tank (11) and the other end connected to the input tube (321), and a first flow sensor (312) and an electric control valve (313) sequentially arranged on the first gas source tube (311) and positioned outside the mixed gas delivery tube (21).
  7. 7. The biomass high-temperature gasification technology coupling green hydrogen methanol preparation system according to claim 3, wherein the mixed gas transmission component (43) comprises a plurality of tooth wall rings (431) rotatably connected with the outer wall of the split column (41), a positioning column (432) positioned at the center of the tooth wall rings (431), and a plurality of blades (433) arranged between the tooth wall rings (431) and the positioning column (432) and distributed in an annular array; The plurality of tooth wall rings (431) are in one-to-one correspondence with the plurality of flow dividing holes (42).
  8. 8. A system for preparing methanol based on coupling green hydrogen by biomass high temperature gasification technology according to claim 3, wherein the second hydrogen supply part (44) comprises a jet box (441) embedded in the split hole (42), an air flow ring (442) sleeved outside the mixed gas conveying pipe (21) and communicated with a plurality of jet boxes (441) through a pipeline, a second air source pipe (443) with one end communicated with the air flow ring (442) and the other end communicated with the exhaust end of the hydrogen storage tank (11), and a second flow sensor (444) and a piezoelectric micro-tuning valve (445) arranged on the second air source pipe (443).
  9. 9. The biomass high-temperature gasification technology coupling green hydrogen methanol preparation system according to claim 7, wherein the power component (46) comprises two power gears (461) symmetrically arranged at two ends of the split column (41), a driving motor (462) fixedly arranged on the outer wall of the bending part (45) through a bracket, a driving rod (463) arranged at the execution end of the driving motor (462) and connected with the two power gears (461) on the outer wall, and a plurality of stirring rods (464) arranged on the outer wall of the driving rod (463); The outer wall of the power gear (461) is meshed with the toothed wall ring (431), and the stirring rod (464) is positioned in the mixed gas conveying pipe (21) and positioned on one side of the flow dividing column (41) close to the bending part (45).
  10. 10. A method for preparing methanol based on coupling green hydrogen by a biomass high-temperature gasification technology, the system for preparing methanol based on coupling green hydrogen by a biomass high-temperature gasification technology as claimed in any one of claims 1 to 9, comprising the following steps: firstly, biomass pretreatment and high-temperature gasification, namely drying and compressing biomass materials, and then sending the biomass materials into a high-temperature gasification furnace (2) for high-temperature gasification to generate crude synthesis gas; Step two, purifying the synthesis gas and recovering waste heat, and sequentially carrying out waste heat recovery, dust removal and purification treatment on the crude synthesis gas to obtain purified synthesis gas; step three, optimizing the hydrogen-carbon ratio and synthesizing the methanol, supplementing green hydrogen into the purified synthesis gas through a gas proportioning system (20), adjusting the hydrogen-carbon ratio, and then sending the purified synthesis gas into a methanol synthesis reaction tower (13) for synthesis reaction to obtain a reacted gas containing crude methanol; Step four, product separation and unreacted gas circulation, wherein the reacted gas is subjected to gas-liquid separation, the obtained liquid phase crude methanol is rectified to obtain a methanol product, and the unreacted gas is returned to a methanol synthesis reaction tower (13) for recycling; And fifthly, returning ash and slag and recycling carbon, and returning the ash and slag collected in the dust removing step to the high-temperature gasification furnace (2) for secondary gasification.

Description

System and method for preparing methanol based on coupling green hydrogen by biomass high-temperature gasification technology Technical Field The invention mainly relates to the technical field of methanol preparation, in particular to a system and a method for preparing methanol based on biomass high-temperature gasification technology coupling green hydrogen. Background With the advancement of global energy structure transformation and "two carbon" targets, the development of low carbon, renewable liquid fuels and chemical production technologies has become an important direction. Biomass is the only renewable organic carbon resource, and the efficient conversion and utilization of the biomass has strategic significance for replacing fossil raw materials and reducing carbon emission. Methanol is an important basic chemical raw material and potential clean fuel, and a green synthesis path thereof is of great interest. The gasification of biomass to produce synthesis gas, and further the synthesis of methanol, is one of the effective ways to realize the high-value utilization of biomass. At present, the technology for preparing methanol by biomass mainly relies on catalytic synthesis of gasified synthetic gas after tempering and purifying. However, the route has obvious technical bottlenecks that firstly, the synthesis gas generated by biomass gasification is low in hydrogen-carbon ratio and contains a certain proportion of CO 2, and the requirement of the traditional methanol synthesis on the ideal hydrogen-carbon ratio is difficult to directly meet, so that the synthesis reaction efficiency is low, the catalyst is easy to deactivate, and the methanol yield is not ideal. Secondly, the hydrogen supplementing in the prior art mostly depends on fossil energy to prepare hydrogen or external hydrogen sources, and is not deeply coupled with renewable energy sources, so that the carbon emission reduction benefit of the whole life cycle is weakened. In addition, the traditional gas mixing and proportioning device often has uneven mixing and lag regulation, so that the real-time accurate control of the components of the synthesis gas is difficult to realize, and the stability and the economy of the process are affected. Therefore, development of a novel system and method capable of effectively integrating renewable energy hydrogen production and biomass gasification technologies is needed, and internal circulation of carbon elements and efficient utilization of energy are realized while the problem of imbalance of the hydrogen-carbon ratio of synthesis gas is solved. Disclosure of Invention Based on the above, the present invention aims to provide a system and a method for preparing methanol based on biomass high-temperature gasification technology coupled with green hydrogen, so as to solve the technical problems set forth in the background art. The system for preparing the methanol by coupling green hydrogen based on the biomass high-temperature gasification technology is sequentially connected with a solid bulk material compressor, a discharge hole of the solid bulk material compressor is connected to a feed inlet of a high-temperature gasification furnace, a synthesis gas outlet of the high-temperature gasification furnace is sequentially connected with a waste heat recovery boiler, a bag-type dust collector and a modularized purification device, a bottom ash outlet of the bag-type dust collector is connected to a material returning hole of the high-temperature gasification furnace through a material returning device, an outlet of the modularized purification device is connected to an inlet of a gas proportioning system, the gas proportioning system is further provided with a hydrogen outlet for connecting a hydrogen storage tank, an outlet of the hydrogen storage tank is connected to an inlet of a methanol synthesis reaction tower, an outlet of the methanol synthesis reaction tower is connected to an inlet of a gas-liquid separator, a liquid phase outlet of the gas-liquid separator is connected to an inlet of the methanol rectification tower, a gas phase outlet of the gas-liquid separator is connected back to an inlet of the methanol synthesis reaction tower, a steam outlet of the high-temperature high-pressure water vapor generator is connected to a steam inlet of the high-temperature heat source recovery boiler, and a heat energy output end of the high-temperature heat source generator provides waste heat energy for the high-temperature water vapor generator. Preferably, the oxygen outlet of the system is connected to the gasifying agent inlet of the high-temperature gasifying furnace, the system further comprises a green hydrogen supply system, the outlet of the green hydrogen supply system is connected to the inlet of the hydrogen storage tank, the outlet of the methanol rectifying tower is connected to the methanol storage tank, the gas proportioning system is configured to control the addition amount of