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Device and method for preparing hydrogen-rich gas based on pyrolysis gas conversion of double fluidized beds

A dual-fluidized bed, pyrolysis gas technology, applied in the field of clean energy technology and coal chemical industry, can solve the problems of low energy utilization efficiency, less pyrolysis gas, less hydrogen content, etc., and achieve the effect of being conducive to stable operation.

Active Publication Date: 2022-02-15
浙江百能科技有限公司
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Problems solved by technology

[0008] Aiming at the shortcomings of low energy utilization efficiency, tar condensation and precipitation to block pipelines, low quality of recovered tar, small amount of pyrolysis gas and low hydrogen content in traditional medium and low temperature pyrolysis gas treatment, the present invention discloses a pyrolysis gas conversion based on a double fluidized bed. Device and method for producing hydrogen-rich gas, the system has high stability, high energy utilization efficiency, and high hydrogen yield

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  • Device and method for preparing hydrogen-rich gas based on pyrolysis gas conversion of double fluidized beds

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Effect test

Embodiment 1

[0059] The pyrolysis gas temperature at the outlet of the pyrolysis furnace is 650°C, the dust content is 12g / Nm3, the water vapor content is 26%, and the tar content is 115g / Nm 3 , The flue gas temperature at the outlet of the circulating fluidized bed boiler is 950°C. The pyrolysis gas is mixed with the high-temperature steam produced by the superheater on the flue gas side after being treated by the pressure reducing valve. After mixing, the steam content is 73%, and the water-to-carbon ratio is about 6. The mixed steam-rich pyrolysis gas is passed into the catalytic reactor, and the tar and water vapor in the pyrolysis gas undergo a reforming reaction under the action of the catalyst to generate hydrogen-rich gas. The outside of the reforming reactor is surrounded by a high-temperature heat exchanger. The hot-end medium of the high-temperature heat exchanger is high-temperature flue gas. The inlet temperature is 950°C, the outlet temperature is 850°C, and the catalytic rea...

Embodiment 2

[0062] The pyrolysis gas temperature at the outlet of the pyrolysis furnace is 700°C, the dust content is 15g / Nm3, the water vapor content is 13%, the tar content is 76g / Nm3, and the flue gas temperature at the outlet of the circulating fluidized bed boiler is 950°C. The pyrolysis gas is mixed with the high-temperature steam produced by the superheater on the flue gas side after being treated by the pressure reducing valve. After mixing, the steam content is 65%, and the water-to-carbon ratio is about 7. The mixed steam-rich pyrolysis gas is passed into the catalytic reactor, and the tar and water vapor in the pyrolysis gas undergo a reforming reaction under the action of the catalyst to generate hydrogen-rich gas. The outside of the reforming reactor is surrounded by a high-temperature heat exchanger. The hot-end medium of the high-temperature heat exchanger is high-temperature flue gas. The inlet temperature is 950°C, the outlet temperature is 850°C, and the catalytic reactio...

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Abstract

The invention discloses a device and method for preparing hydrogen-rich gas based on pyrolysis gas conversion of double fluidized beds. The device comprises a pyrolyzing furnace, a circulating fluidized bed, and a catalytic reactor, a superheater, a high-temperature dust remover, a waste heat boiler, an intercooler, a fan and a hydrogen-rich gas storage tank which are sequentially connected with the pyrolyzing furnace, and a cyclone dust collector, a high-temperature heat exchanger and a superheater which are sequentially connected with the circulating fluidized bed. A process route for preparing hydrogen-rich gas through catalytic reforming of tar water vapor under a high-temperature condition is adopted, and waste heat recovery is carried out through a combined mode of the superheater and the waste heat boiler, so that a mode of spraying ammonia water for quenching and electrically capturing tar is avoided; the problems that sensible heat of high-temperature pyrolysis gas is wasted, tar is condensed and separated out to block a pipeline, the pyrolysis gas amount is small and the hydrogen content is small are solved, heat needed by the device and high-temperature steam needed by reforming reaction both come from the circulating fluidized bed boiler side, steam or energy does not need to be supplemented externally, and the purposes of energy utilization and material utilization of the whole device are optimal are achieved.

Description

technical field [0001] The invention relates to a coal gas conversion and purification process for producing hydrogen-rich gas, which belongs to the fields of clean energy technology and coal chemical industry, and specifically relates to a device and method for producing hydrogen-rich gas based on dual-fluidized bed pyrolysis gas conversion. Background technique [0002] The active development of new energy and the efficient and clean utilization of traditional energy are the current energy patterns in our country. New energy currently being applied and researched mainly includes: solar energy, wind energy, biomass energy, nuclear energy and hydrogen energy. Hydrogen energy occupies a very important position in new energy due to its excellent properties of large reserves, high calorific value, multi-purpose and non-polluting. At present, the production methods of hydrogen energy mainly include hydrogen production from natural gas, hydrogen production from electrolysis of w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/38C01B3/32C01B3/56C01B3/50
CPCC01B3/388C01B3/326C01B3/56C01B3/50C01B2203/0233C01B2203/0495Y02P20/10Y02P20/52Y02P20/129
Inventor 张相常涛雷祖磊刘晓燕张江林
Owner 浙江百能科技有限公司
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