Intermediate temperate pressure swing adsorption method for using bifunctional adsorbent in adsorption enhanced type vapor reforming and water-vapor transformation reactions

Abstract

The invention discloses an intermediate temperature pressure swing adsorption method for using a bifunctional adsorbent in adsorption enhanced type vapor reforming and water-vapor transformation reactions, belonging to the technical field of clean energy. According to the method, the bifunctional adsorbent which has dual functions of catalytic reaction and decarburization desulphurization is added into a reactor. The process ensures that multiple hydrogen production reactions are performed in the same reactor under an intermediate temperature condition, so that the investment in system equipment is reduced and the process flow is simplified; the temperature of a reforming reactor is low, the requirement for steel products is lowered, and the equipment cost is reduced; the sensitive heat of raw material gas can be directly recovered, the overall thermal efficiency of a system is improved, heat exchange equipment of the system is reduced, and the system cost is reduced; the adsorption / regeneration of the adsorbent can be realized without temperature rise and drop, the energy consumption is reduced, the regeneration speed of the adsorbent is high, and the gas treating capacity of a pressure swing adsorption system can be improved.

Description

technical field [0001] The invention belongs to the technical field of clean energy, and specifically relates to a method for using a dual-function adsorbent to carry out adsorption-enhanced steam reforming, water-gas shift reaction and medium temperature pressure swing adsorption. Background technique [0002] With the increasingly prominent energy and environmental issues, H 2 As a clean and efficient fuel, it has attracted much attention, and hydrogen is also an important raw material in the chemical industry. Methane steam reforming is the main way of traditional large-scale industrial hydrogen production. In addition, other hydrocarbon fuels can be steam reformed and coal gasification synthesis gas can also be produced by water gas shift reaction. Taking the steam reforming of methane as an example, in the traditional industrial route, the raw material gas needs to go through three process steps of reforming reactor, water gas shift reactor and purification device to f...

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Problems solved by technology

[0009] At present, the PSA gas separation method has been widely used in natural gas, coal-fired boiler flue gas, synthetic ammonia shift gas, roasting tail gas in alumina production, and CO in lime kiln gas. 2 This method overcomes the disadvantages of wet decarbonization, complex operation in desulfurization, high energy consumption, high cost, and large equipment corrosion.

However, the traditional PSA adsorption separation process is limited by the adsorbent and equipment working conditions, and often can only choose normal temperature operation (such as 20-45°C)

At the same time, common PSA adsorbents (such as molecular sieves) for H 2 The presence of O is also very sensitive, in the H 2 When O coexists with other gases, it will preferentially absorb H 2 O, so the pressure swing adsorption process and the reforming reaction or water-gas shift reaction cannot be carried out simultaneously in the same reactor, and the product gas of the reforming reaction or water-gas shift reaction needs to be cooled and dehydrated before passing through an independent PSA system. Purify hydrogen

If the catalyst and adsorbent are directly mixed or used in combination, on the one hand, the catalytic reaction and the adsorption reaction are not coupled in situ, and the efficiency is low; on the other hand, the amount of catalyst and adsorbent required will increase, which will increase the volume of the reactor. thus increasing equipment cost

In addition, some feedstock gases may also contain H 2 S, desulfurization device needs to be installed, system complexity and investment cost increase

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