Fuel dealkalization device and method thereof and circulating fluidized bed gasification device and method thereof

A circulating fluidized bed, fuel gas technology, applied in the direction of granular/powder fuel gasification, etc., can solve the problems of enhanced slagging risk, low utilization efficiency of high-alkali coal, slagging, etc. Fuel gas efficiency, solving large water consumption, reducing alkali metal content

Active Publication Date: 2021-05-28
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with other coal types in China, the Na content in Xinjiang Zhundong high-alkaline 2 O content is 3-15%, CaO content is 10-40%, Fe 2 o 3 The content of alkaline metals is between 7% and 20%. Such a high content of basic metals leads to the low melting temperature of coal ash in Zhundong coal in Xinjiang, which shows strong slagging and fouling characteristics during the thermochemical conversion process, which greatly limits its large-scale development and development. use
[0004] On the active boilers, it is impossible to realize the long-term and full-load operation of high-alkali coal
When purely burning high-alkali coal under high load, the heating surface of the boiler (water wall, partition screen, superheater, reheater, etc.) is prone to serious contamination, slagging, and ash accumulation, resulting in frequent overheating of some heating surfaces , pipe burst, flue blockage, coke loss, etc.
At present, power plants usually use low-load operation, blending other coal types, or adding additives to alleviate the above problems, but this leads to low utilization efficiency of high-alkali coal
[0005] On the active circulating fluidized bed gasifier,

Method used

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  • Fuel dealkalization device and method thereof and circulating fluidized bed gasification device and method thereof
  • Fuel dealkalization device and method thereof and circulating fluidized bed gasification device and method thereof
  • Fuel dealkalization device and method thereof and circulating fluidized bed gasification device and method thereof

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Embodiment 1

[0070] The following combination figure 1 , taking high-alkali coal as an example to illustrate a circulating fluidized bed gasification device suitable for high-alkali coal, which includes a main bed 10, a gas-solid separator 11, an upper return device 12, an auxiliary bed 13 and Lower feeder 14.

[0071] The main bed 10 communicates with the gas-solid separator 11, the gas-solid separator 11 communicates with the upper feeder 12, the upper feeder 12 communicates with the auxiliary bed 13, the auxiliary bed 13 communicates with the main bed 10 through a connecting pipe, and the auxiliary bed 13 It communicates with the lower feeder 14 , and the lower feeder 14 communicates with the main bed 10 .

[0072] The auxiliary bed 13 is provided with a fuel inlet 20 , an auxiliary gasification agent inlet 21 , a high-temperature circulating semi-coke inlet 22 , a high-temperature dealkalization solid fuel overflow port 23 and an alkali-rich crude fuel gas outlet 24 .

[0073] The ma...

Embodiment 2

[0079] see figure 2 , is a preferred embodiment of the present invention, similar in structure to Embodiment 1, the main difference is that the auxiliary bed 13 has a certain inclination angle. The angle α between the wall surface of the auxiliary bed 13 and the horizontal plane is between 45° and 90°. The auxiliary gasification agent is passed into the bottom of the auxiliary bed 13 from the auxiliary gasification agent inlet, and is mixed with fresh high-alkali coal and high-temperature semi-coke transported by the upper return device 12 during the process of moving upward with the bottom material of the auxiliary bed 13 1. During the reaction process, a certain amount of pyrolysis gas and gasification gas are formed. Due to the volume expansion, the velocity in the middle and upper part of the auxiliary bed 13 is higher than the velocity at the bottom, which will increase the escape of fine particles and affect the residence time and desorption of fresh high-alkaline fuel....

Embodiment 3

[0081] see image 3 , is another preferred embodiment of the present invention, similar to the structure of embodiment 1, the main difference is that the auxiliary bed 13 has a secondary air nozzle, and the structure of the secondary air nozzle is as follows Figure 4 shown. The angle β between the secondary air gasification agent inlet of the auxiliary bed 13 and the horizontal plane is between 0° and 60°. The introduction of the secondary air will strengthen the particle disturbance and reaction in the auxiliary bed 13, thereby promoting the dealkalization process.

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Abstract

The invention discloses a fuel dealkalization device and a method and a circulating fluidized bed gasification device and a method thereof, and the fuel dealkalization device is a bubbling fluidized bed and comprises a fuel inlet which is located at the upper part of the fuel dealkalization device and is used for conveying fuel to the fuel dealkalization device; an auxiliary gasifying agent inlet positioned at the lower part of the fuel dealkalization device and used for conveying an auxiliary gasifying agent to the fuel dealkalization device, wherein the fuel and the auxiliary gasifying agent are subjected to dealkalization reaction under heating; a dealkalized solid fuel overflow port positioned at the upper part of the fuel dealkalization device and used for outputting the dealkalized solid fuel generated by the dealkalization reaction; and an alkali-rich fuel gas outlet is positioned at the upper part of the fuel dealkalization device and used for outputting alkali-rich fuel gas generated by the dealkalization reaction. The invention further provides the fuel dealkalization method and the circulating fluidized bed gasification device and the method thereof. The method solves the technical problem of slag bonding caused by high alkali metal content of the high-alkali coal, realizes safe and reliable utilization of the high-alkali coal, and has a wide market application prospect.

Description

technical field [0001] The invention relates to the technical field of fuel gasification, in particular to a fuel dealkalization device and method, and a circulating fluidized bed gasification device and method. Background technique [0002] Xinjiang has rich reserves of coal resources, with predicted reserves reaching 290 trillion tons, accounting for about 40% of China's total coal resources. Xinjiang will become China's energy succession area and strategic energy reserve area. The large-scale development and utilization of coal resources in Xinjiang plays a decisive role in China's energy strategy security and the leapfrog development of Xinjiang. [0003] Among the major coal fields in Xinjiang, the Zhundong coal field is currently the largest integrated coal field in China, with predicted reserves of up to 390 billion tons. Based on China's current annual coal consumption, the Zhundong Coalfield alone can be used nationwide for about one hundred years. Due to the spec...

Claims

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Application Information

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IPC IPC(8): C10J3/56
CPCC10J3/56
Inventor 张海霞董鹏飞朱治平吕清刚
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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