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A high-throughput circulating fluidized bed low-rank coal gasification device and method

A circulating fluidized bed and coal gasification technology, which is applied in the gasification process, granular/powdered fuel gasification, and combustible gas production, etc. It can solve the problems of difficult ash discharge at the bottom, low carbon conversion rate, and low gasification intensity. , to achieve the effect of improving the device's processing capacity and gasification intensity

Active Publication Date: 2020-05-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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AI Technical Summary

Problems solved by technology

[0004] The existing fluidized bed gasification technology will inevitably encounter the following difficulties when gasifying low-rank coals such as lignite and long-flame coal: 1. The conversion rate of carbon is low (about 90%); 2. The gasification intensity is low Low; 3. It is difficult to discharge ash at the bottom

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  • A high-throughput circulating fluidized bed low-rank coal gasification device and method

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Embodiment 1

[0025] In this embodiment, the ratio of the cross-sectional area of ​​the carbon residue riser deep gasification zone C to the low-rank coal strong mixed pyrolysis, gasification, and combustion zone B is 0.5:1, and the outlet of the central jet tube 4 is connected to the V-shaped gas distribution plate 1 The bottom is equal in height.

[0026] The Mengdong lignite is sent to the pulverizing system, and after being crushed by the coal mill and dried by the dryer, the particle size is less than 15mm, and the moisture content is less than 10wt%. The coal feed pipe 9 in the middle of B is continuously fed into the furnace, and at the same time, the distribution plate inlet pipe 3, the central jet pipe 4, and the air inlet 7 of the separation column are continuously fed into the air at the bottom of the gasifier, and the low-rank coal is first cracked or pyrolyzed , and then part of the gasification or combustion reaction occurs, and the high-temperature semi-coke with a small part...

Embodiment 2

[0030] The cross-sectional area ratio of riser gasification zone C to strong mixing pyrolysis, gasification and combustion zone B is 0.75:1; the outlet of central jet tube 4 is slightly higher than the bottom of V-shaped gas distribution plate 1 . All the other devices are the same as those in Example 1.

[0031] In this example, Fuxin long-flame coal is fed into the pulverizing system, crushed by a coal mill and dried by a dryer so that the particle size is less than 15mm and the moisture content is less than 10wt%. The coal feed pipe 9 in the middle of the gasification / combustion zone B is continuously fed into the furnace, and at the same time, air is continuously fed into the distribution plate inlet pipe 3, the central jet pipe 4, and the air inlet 7 of the separation column at the bottom of the gasifier, and the low-rank coal First crack or pyrolyze, then partly gasify or burn, and generate high-temperature semi-coke with small particle size, which enters the riser gasif...

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Abstract

The invention discloses a device and a method for high-flux circulating fluidized bed low-rank coal gasifying, and belongs to the field of clean utilization of coal. The coal gasifying reaction device consists of a jet flow enhanced bottom ash separation area, a low-rank coal strong mixed pyrolysis, gasifying and combustion area, a residual carbon lifting pipe deep gasifying area, a two-stage cyclone separator and a material return mechanism. The coal gasifying method is characterized in that the lifting pipe gasifying area is directly connected by a secondary material return mechanism at higher air speed, the deep gasifying of residual carbon in fine ash is realized under the high flux condition, and the high-efficiency separation of bottom ash is realized by a high-speed jet flow pipe and a separation column coupling structure. The low-rank coal gasifying device and the method have the advantages that the carbon conversion rate is high, the gasifying strength is high, the utilization rate of device is high, the ash discharging is easy, and the device and method are especially suitable for improving the quality of low-rank coals, such as lignite.

Description

technical field [0001] The invention belongs to the field of clean coal utilization equipment, and in particular relates to a high-flux circulating fluidized bed low-rank coal gasification device and method. Background technique [0002] The resource endowment of "rich coal, poor oil and little gas" determines that coal will still be an important basic energy in my country in the foreseeable future, and gasification technology is one of the important ways to use coal cleanly and efficiently. According to reports, low-rank coal mainly composed of lignite and long-flame coal accounts for about 45% of the remaining recoverable coal reserves in China, but the "two highs and three lows" (high volatile matter, high moisture, and low ash melting point) , low density, low calorific value) characteristics lead to serious environmental pollution and difficulty in large-scale utilization. Therefore, the development of low-rank coal gasification technology is an important support and gu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/54C10J3/56C10J3/84C10J3/66
CPCC10J3/54C10J3/56C10J3/66C10J3/84C10J2300/0906C10J2300/0909C10J2300/093C10J2300/0959C10J2300/0976C10J2300/1603C10J2300/1628
Inventor 张锴张仪刘芸关彦军常剑齐娜娜滕阳陈宏刚
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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