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Double-fluidized-bed reactor for endothermic reactions and method for supplying heat for endothermic reactions

An endothermic reaction and double fluidized bed technology, applied in chemical instruments and methods, chemical/physical processes, etc., can solve the problem of unsuitable long-term continuous operation, equipment corrosion, and cannot directly solve the problem of heat supply for strong endothermic chemical reactions And other issues

Active Publication Date: 2012-03-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although molten salt can reach a higher heating temperature, it may have a corrosive effect on the equipment, the operation is difficult, and it is not suitable for long-term continuous operation, so it is rarely used in industrial fluidized bed reactors
In addition, the existing fluidized bed reactors enhance heat transfer through fluidized operation, but cannot directly solve the problem of heat supply for strong endothermic chemical reactions at medium and high temperatures

Method used

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  • Double-fluidized-bed reactor for endothermic reactions and method for supplying heat for endothermic reactions
  • Double-fluidized-bed reactor for endothermic reactions and method for supplying heat for endothermic reactions
  • Double-fluidized-bed reactor for endothermic reactions and method for supplying heat for endothermic reactions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] use as figure 1 The endothermic reaction shown is the non-oxidative catalytic dehydrogenation of propane using a dual fluidized bed reactor. Propane dehydrogenation is a strong endothermic reaction with a reaction temperature of 600°C.

[0062] Firstly, the nozzles in the heat supply fluidized bed body 2 are ignited to raise the temperature of the bed body.

[0063] Next, inert Al with an average particle diameter of 60-200 microns 2 o 3 The particles are used as heat carrier particles in the fluidized bed body 2 for heating, and air is passed through to make them fluidized. The combustion of the gas causes the temperature of the second fluidized bed to rise.

[0064] Then, Pt-Sn / Al with an average particle size of 60-100 microns 2 o 3 Catalyst particles are introduced into the fluidized bed body 1 for endothermic reaction, and nitrogen gas is fed to make it fluidized. When the bed temperature of the first fluidized bed rises to the reaction temperature, pass the...

Embodiment 2

[0067] use as figure 1 The endothermic reaction shown is a dual fluidized bed reactor for hydrocarbon steam reforming. The reaction temperature of this reaction was 550°C.

[0068] Among them, the reaction gas is natural gas and steam, and the product gas is synthesis gas. Catalyst particles Ni / Al in fluidized bed body 1 for endothermic reaction 2 o 3 Under the action of reaction gas, it is in a bubbling or turbulent fluidization state.

[0069] Different from Embodiment 1, in order to make the second fluidized bed layer 21 generate heat, first pass hot air (for example, by auxiliary combustion chamber heating) in the internal fluidized bed, make the fluidized bed bed for heat supply Layer 21 heats up. When the temperature rises to 380°C, light diesel oil is injected through the fuel nozzle 23 to make it combust to heat the fluidized bed layer 21 for heating so as to provide heat for the steam reforming of hydrocarbons. Wherein, the heat carrier particles in the fluidize...

Embodiment 3

[0072] use as figure 2 The endothermic reaction shown is the non-oxidative catalytic dehydrogenation of butane using a dual fluidized bed reactor. Butane dehydrogenation is a strong endothermic process with a reaction temperature of 450°C.

[0073] The reaction gas is butane, and the catalyst is the same as in Example 1.

[0074] The heat carrier particles in the fluidized bed body 2 for heating are inert Al with an average diameter of 60-150 microns 2 o 3 , which circulates between the fluidized bed body 2 for heat supply and the double fluidized bed reactor 3 for heating endothermic reaction through the riser, and the double fluidized bed reactor 3 for heating endothermic reaction can be an external combustion tube Furnace. The external combustion tube furnace relies on fuel combustion to obtain heat, so that the flowing heat carrier particles in the tube furnace can be heated to above 550 °C.

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Abstract

The invention discloses a double-fluidized-bed reactor for endothermic reactions and a method for supplying heat for endothermic reactions. The double-fluidized-bed reactor comprises: a bed body of a fluidized bed for endothermic reactions, which is closed and in which a first fluidized bed layer consisting of particles of catalyst for endothermic reactions or reactant particles, is arranged, wherein the bottom of the bed body is provided with a first gas distributor which is connected with a gas source of the first gas to supply the first gas to the first fluidized bed layer; and a bed body of a fluidized bed for supplying heat, which is closed and in which a second fluidized bed layer consisting of hot carrier particles is arranged, wherein the bottom of the bed body a second gas distributor which is connected with a gas source of a second gas for supplying the second gas to the second fluidized bed layer. The bed body of the fluidized bed for endothermic reactions and the bed body of the fluidized bed for supplying heat are embedded together. The double-fluidized-bed reactor for endothermic reactions, which is disclosed by the embodiment of the invention has the advantages of safety, stability, high heat conductivity and the like and is particularly suitable for supplying heat to medium / high temperature endothermic reactions at a temperature of above 400 DEG C.

Description

technical field [0001] The invention relates to the technical field of chemical reaction devices, in particular to a double fluidized bed reactor for endothermic reaction and a heat supply method for endothermic reaction. Background technique [0002] The chemical reaction process is usually accompanied by a certain thermal effect. According to the chemical potential change of the material before and after the reaction, it can be known that some reactions absorb heat, and some reactions release heat. Correspondingly, the chemical reactor design needs to set the heat supply or heat removal means according to the heat of reaction. Among them, the problem of stable and uniform heat supply for endothermic reactions at medium and high temperatures (referring to above 400°C) is a difficult point in chemical industry. [0003] Tube furnace reactors are commonly used in industry to implement strongly endothermic reactions under high temperature conditions. Specifically, the endoth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/26
Inventor 王垚魏飞褚玥李云鑫吴同威
Owner TSINGHUA UNIV
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