Rotary kiln and poly-generation system utilizing rotary kiln for producing metal hydride

Abstract

The invention discloses a rotary kiln and a poly-generation system utilizing the rotary kiln for producing metal hydride. The poly-generation system comprises a lime production sub-system, a pulverized coal production sub-system, a calcium carbide production sub-system, a magnesium metal production sub-system, a waste heat utilizing and gas recycling sub-system, a metal hydrogen storage sub-system and a cement clinker production subsystem. Limestone, magnesite / dolomite, quartz sand and coal serve as raw materials, and the limestone is roasted into lime; in a lime kiln built through zirconia bricks, the lime and the coke powder are subjected to the high-temperature reaction so that liquid calcium carbide can be obtained; the magnesite / dolomite is roasted into magnesium oxide, and the calcium carbide, the magnesium oxide and the quartz sand are mixed to generate magnesium; high-concentration carbon dioxide, coal pyrolysis gas and calcium carbide tail gas obtained through decomposing of the limestone and the magnesite are recycled and processed, and hydrogen and food-level carbon dioxide are obtained; magnesium hydride is generated through union of hydrogen and magnesium; and carbide slag and magnesium slag are processed, and cement clinker and carbon powder are obtained. According to the poly-generation system, emission of solid waste is avoided, and carbon emission is greatly reduced.

Description

technical field

[0001] The invention relates to the field of rotary kilns, in particular to a rotary kiln and a polygeneration system for producing metal hydrides using the rotary kiln. Background technique

[0002] Hydrogen energy is considered to be an important secondary energy source in the new century due to its outstanding features such as high combustion efficiency, clean combustion products, easy low-cost storage and transportation, and diversified uses. Large-scale and economical hydrogen production, safe and efficient storage and transportation are urgent problems to be solved. Today, the hydrogen storage and transportation methods used in practical applications are mainly high-pressure containers, liquid hydrogen storage tanks and metal hydride hydrogen storage devices. The outstanding advantages of using metal hydrides to store and transport hydrogen are good safety, and the hydrogen storage density per unit weight is much higher than that of high-pressure conta...

Examples

Embodiment 1

[0037] A polygeneration system for the production of metal hydrides utilizing zirconia bricks such as Figure 1-12 As shown, it includes lime production subsystem, coal powder production subsystem and calcium carbide production subsystem, metal magnesium production subsystem, waste heat utilization and gas recovery subsystem, metal hydrogen storage subsystem, and cement clinker production subsystem.

[0038] Such as figure 1As shown, the raw materials required by the whole system are limestone, anthracite, magnesite / dolomite, and quartz sand. The lime production subsystem uses limestone as raw material and obtains lime through calcination and crushing; the pulverized coal production subsystem crushes coal, and then mixes Coal and lime are pyrolyzed to obtain lime powder and coke powder; then, in the calcium carbide production subsystem, the rotary kiln is used as the main equipment for liquid calcium carbide production; liquid calcium carbide, magnesite / dolomite, and quartz sa...

Embodiment 2

[0049] The difference between this embodiment and Embodiment 1 is that part of the ordinary refractory bricks is built as an indirect passage structure, which is mainly composed of refractory bricks to form an inner cylinder, an outer cylinder, and an intermediate support structure. The bricks form the inner cylinder, the refractory bricks on the outer ring and the steel structure form the outer cylinder, and refractory materials are built between the inner cylinder and the outer cylinder to form a support. The inner ring and the outer ring in the present invention may refer to one layer of refractory bricks, or multiple layers of refractory bricks, so as to ensure the stability of the overall structure. The material inlet and material outlet connected to the partition channel are set on the steel structure, and the powdery or granular material is transported into the partition channel by the carbon dioxide gas flow. The material is organic and / or inorganic, and the material is...

Embodiment 3

[0051] The difference between this embodiment and embodiment 1 is: as Figure 13 As shown, the lime production subsystem and the calcium carbide production subsystem are combined, and the combination of the rotary kiln 3 and the vertical kiln 38 is used to produce lime and calcium carbide. All the refractory materials of the rotary kiln 3 are built with zirconia bricks, and the length of the rotary kiln 3 is 6 meters. A vertical kiln 38 is arranged at the kiln tail of the rotary kiln 3, and a vertical preheating passage 36 is arranged in the kiln chamber in the vertical kiln 38. The preheating passage 36 is isolated from the kiln chamber, and the combustion exhaust gas at the kiln tail is drawn out through the exhaust gas outlet. From the bottom of the shaft kiln to the kiln chamber between the shaft kiln and the preheating channel. In this embodiment, two preheating channels 36 with square holes are provided. The preheating channels 36 include a wear-resistant silicon carbid...

technical field

[0001] The invention relates to the field of rotary kilns, in particular to a rotary kiln and a polygeneration system for producing metal hydrides using the rotary kiln. Background technique

[0002] Hydrogen energy is considered to be an important secondary energy source in the new century due to its outstanding features such as high combustion efficiency, clean combustion products, easy low-cost storage and transportation, and diversified uses. Large-scale and economical hydrogen production, safe and efficient storage and transportation are urgent problems to be solved. Today, the hydrogen storage and transportation methods used in practical applications are mainly high-pressure containers, liquid hydrogen storage tanks and metal hydride hydrogen storage devices. The outstanding advantages of using metal hydrides to store and transport hydrogen are good safety, and the hydrogen storage density per unit weight is much higher than that of high-pressure conta...

Examples

Embodiment 1

[0037] A polygeneration system for the production of metal hydrides utilizing zirconia bricks such as Figure 1-12 As shown, it includes lime production subsystem, coal powder production subsystem and calcium carbide production subsystem, metal magnesium production subsystem, waste heat utilization and gas recovery subsystem, metal hydrogen storage subsystem, and cement clinker production subsystem.

[0038] Such as figure 1As shown, the raw materials required by the whole system are limestone, anthracite, magnesite / dolomite, and quartz sand. The lime production subsystem uses limestone as raw material and obtains lime through calcination and crushing; the pulverized coal production subsystem crushes coal, and then mixes Coal and lime are pyrolyzed to obtain lime powder and coke powder; then, in the calcium carbide production subsystem, the rotary kiln is used as the main equipment for liquid calcium carbide production; liquid calcium carbide, magnesite / dolomite, and quartz sa...

Embodiment 2

[0049] The difference between this embodiment and Embodiment 1 is that part of the ordinary refractory bricks is built as an indirect passage structure, which is mainly composed of refractory bricks to form an inner cylinder, an outer cylinder, and an intermediate support structure. The bricks form the inner cylinder, the refractory bricks on the outer ring and the steel structure form the outer cylinder, and refractory materials are built between the inner cylinder and the outer cylinder to form a support. The inner ring and the outer ring in the present invention may refer to one layer of refractory bricks, or multiple layers of refractory bricks, so as to ensure the stability of the overall structure. The material inlet and material outlet connected to the partition channel are set on the steel structure, and the powdery or granular material is transported into the partition channel by the carbon dioxide gas flow. The material is organic and / or inorganic, and the material is...

Embodiment 3

[0051] The difference between this embodiment and embodiment 1 is: as Figure 13 As shown, the lime production subsystem and the calcium carbide production subsystem are combined, and the combination of the rotary kiln 3 and the vertical kiln 38 is used to produce lime and calcium carbide. All the refractory materials of the rotary kiln 3 are built with zirconia bricks, and the length of the rotary kiln 3 is 6 meters. A vertical kiln 38 is arranged at the kiln tail of the rotary kiln 3, and a vertical preheating passage 36 is arranged in the kiln chamber in the vertical kiln 38. The preheating passage 36 is isolated from the kiln chamber, and the combustion exhaust gas at the kiln tail is drawn out through the exhaust gas outlet. From the bottom of the shaft kiln to the kiln chamber between the shaft kiln and the preheating channel. In this embodiment, two preheating channels 36 with square holes are provided. The preheating channels 36 include a wear-resistant silicon carbid...

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