Fluidized-fixed composite bed reaction adsorption reinforced hydrogen production device and method by methane vapor reforming

Abstract

The invention discloses a fluidized-fixed composite bed reaction adsorption reinforced hydrogen production device by methane vapor reforming, which mainly comprises a fluidized-fixed composite bed reactor, a primary cyclone separator, a secondary cyclone separator and a regenerator. The invention also discloses a reaction adsorption reinforced hydrogen production method by methane vapor reforming, which comprises steps as follows: a nickel-base reforming catalyst is fixed and filled into the composite reactor in a specific mode; a nano or micro CaO-base CO2 adsorbent in a fluidized state can contact a catalyst bed layer, and the reaction adsorbs CO2 released by the reforming reaction; and the CO2 enters the separators and regenerator through the catalyst bed layer, and enters the fluidized-fixed composite bed reactor to be recycled. The method and device disclosed by the invention avoids the possibility of the catalyst entering the high-temperature regenerator, thereby prolonging the service life of the catalyst; and the invention solves the problem of unmatched service life between the catalyst and adsorbent when a single fixed bed or fluidized bed reactor is used for reaction adsorption to reinforce the methane vapor reforming reaction.

Description

technical field

[0001] The invention relates to the technical fields of energy, chemical industry, oil refining, etc., and in particular to a device and method for reaction adsorption enhanced methane steam reforming to produce hydrogen. Background technique

[0002] Hydrogen production by steam methane reforming (SMR for short) has been used for the first time in 1926 and has become the most widely used method for hydrogen production from natural gas in industry. The traditional SMR hydrogen production process includes preheating and pretreatment of feedstock, reforming, water vapor displacement (including high and low temperature conversion), CO removal and methanation. The reforming reaction uses a fixed-bed reactor, the reaction temperature is 750-920°C, the reaction pressure is 2-3MPa, and the catalyst is generally a nickel-based catalyst. This process has problems such as high reaction temperature, low concentration of hydrogen at the outlet, and many steps in the rea...

Examples

Embodiment 1

[0042] use as figure 1 In the device for hydrogen production by adsorption-enhanced steam reforming of methane, the fluidized-fixed composite bed reactor 1 adopts a riser reactor, and the dosage and specifications of the adsorbent and catalyst are as follows:

[0043] Nano-CaO-based CO 2 Adsorbent microspheres: the bulk density is 0.8g / cm 3 , the average particle size is 5 microns, and the amount of adsorbent is 3000g. riser reactor press figure 2 (a) is filled with a nickel-based catalyst, the catalyst is a Raschig ring with a diameter of 10mm and a length of 6mm, and a bulk density of 1.5g / cm 3 , catalyst consumption 1500g, bed porosity 0.4.

[0044] The operation steps are as follows:

[0045] (1) Pass the preheated mixture of water vapor and methane into the riser reactor 1, drive the adsorbent on the first gas distributor 7, and contact the catalyst 3 filled in the middle of the riser reactor. Adsorption enhanced reforming reaction; wherein the molar ratio of water...

Embodiment 2

[0051] use as figure 1 The shown adsorption enhanced methane steam reforming hydrogen production reaction device, the fluidized-fixed composite bed reactor 1 adopts a riser reactor, and the dosage and specifications of the adsorbent and catalyst are as follows:

[0052] Nano-CaO-based CO 2 Adsorbent microspheres: bulk density 0.8g / cm 3 , the average particle size is 100 microns, and the amount of adsorbent is 3000g. Nickel-based catalyst packed in riser reactor: according to figure 2 As shown in (b) filled with catalyst, the catalyst is a cylinder with a diameter of 10mm and a length of 6mm, with a solid density of 2g / cm 3 , catalyst consumption 1500g, bed porosity 0.7.

[0053] The specific operation steps are the same as in Example 1, wherein the mol ratio of water vapor and methane is 2:1, and the methane flow rate is 12L / min, the gas velocity of the riser reactor is 0.6m / s, and the temperature of the riser reactor is 650 °C, the regeneration temperature is 800°C, the...

Embodiment 3

[0056] use as figure 1 The shown adsorption enhanced methane steam reforming hydrogen production reaction device, the fluidized-fixed composite bed reactor 1 adopts a fluidized bed reactor, and the dosage and specifications of the adsorbent and catalyst are as follows:

[0057] Nano-CaO-based CO 2 Adsorbent microspheres, bulk density 0.8g / cm 3 , the average particle size is 20 microns, and the amount of adsorbent is 3000g. Nickel-based catalyst packed in fluidized bed reactor: according to figure 2 (c) shown in the filling, the shape is a seven-hole sphere, the particle size is 16mm, and the solid density is 2g / cm 3 , catalyst consumption 1500g, bed porosity 0.5.

[0058] The specific operation steps are the same as in Example 1, wherein the mol ratio of water vapor and methane is 6:1, and the methane flow rate is 15L / min, the fluidized bed reactor gas velocity is 3m / s, and the fluidized bed reactor The temperature is 600°C, the regeneration temperature is 800°C, the reg...

technical field

[0001] The invention relates to the technical fields of energy, chemical industry, oil refining, etc., and in particular to a device and method for reaction adsorption enhanced methane steam reforming to produce hydrogen. Background technique

[0002] Hydrogen production by steam methane reforming (SMR for short) has been used for the first time in 1926 and has become the most widely used method for hydrogen production from natural gas in industry. The traditional SMR hydrogen production process includes preheating and pretreatment of feedstock, reforming, water vapor displacement (including high and low temperature conversion), CO removal and methanation. The reforming reaction uses a fixed-bed reactor, the reaction temperature is 750-920°C, the reaction pressure is 2-3MPa, and the catalyst is generally a nickel-based catalyst. This process has problems such as high reaction temperature, low concentration of hydrogen at the outlet, and many steps in the rea...

Examples

Embodiment 1

[0042] use as figure 1 In the device for hydrogen production by adsorption-enhanced steam reforming of methane, the fluidized-fixed composite bed reactor 1 adopts a riser reactor, and the dosage and specifications of the adsorbent and catalyst are as follows:

[0043] Nano-CaO-based CO 2 Adsorbent microspheres: the bulk density is 0.8g / cm 3 , the average particle size is 5 microns, and the amount of adsorbent is 3000g. riser reactor press figure 2 (a) is filled with a nickel-based catalyst, the catalyst is a Raschig ring with a diameter of 10mm and a length of 6mm, and a bulk density of 1.5g / cm 3 , catalyst consumption 1500g, bed porosity 0.4.

[0044] The operation steps are as follows:

[0045] (1) Pass the preheated mixture of water vapor and methane into the riser reactor 1, drive the adsorbent on the first gas distributor 7, and contact the catalyst 3 filled in the middle of the riser reactor. Adsorption enhanced reforming reaction; wherein the molar ratio of water...

Embodiment 2

[0051] use as figure 1 The shown adsorption enhanced methane steam reforming hydrogen production reaction device, the fluidized-fixed composite bed reactor 1 adopts a riser reactor, and the dosage and specifications of the adsorbent and catalyst are as follows:

[0052] Nano-CaO-based CO 2 Adsorbent microspheres: bulk density 0.8g / cm 3 , the average particle size is 100 microns, and the amount of adsorbent is 3000g. Nickel-based catalyst packed in riser reactor: according to figure 2 As shown in (b) filled with catalyst, the catalyst is a cylinder with a diameter of 10mm and a length of 6mm, with a solid density of 2g / cm 3 , catalyst consumption 1500g, bed porosity 0.7.

[0053] The specific operation steps are the same as in Example 1, wherein the mol ratio of water vapor and methane is 2:1, and the methane flow rate is 12L / min, the gas velocity of the riser reactor is 0.6m / s, and the temperature of the riser reactor is 650 °C, the regeneration temperature is 800°C, the...

Embodiment 3

[0056] use as figure 1 The shown adsorption enhanced methane steam reforming hydrogen production reaction device, the fluidized-fixed composite bed reactor 1 adopts a fluidized bed reactor, and the dosage and specifications of the adsorbent and catalyst are as follows:

[0057] Nano-CaO-based CO 2 Adsorbent microspheres, bulk density 0.8g / cm 3 , the average particle size is 20 microns, and the amount of adsorbent is 3000g. Nickel-based catalyst packed in fluidized bed reactor: according to figure 2 (c) shown in the filling, the shape is a seven-hole sphere, the particle size is 16mm, and the solid density is 2g / cm 3 , catalyst consumption 1500g, bed porosity 0.5.

[0058] The specific operation steps are the same as in Example 1, wherein the mol ratio of water vapor and methane is 6:1, and the methane flow rate is 15L / min, the fluidized bed reactor gas velocity is 3m / s, and the fluidized bed reactor The temperature is 600°C, the regeneration temperature is 800°C, the reg...

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