Novel lignite gasification process by using fluidized bed with ash circulation and equipment of novel lignite gasification process

A fluidized bed gasifier and coal gasification technology, which is applied in the field of coal gasification, can solve the problems of unfavorable ash content circulation, low efficiency of synthesis gas, and difficult to circulate, and achieves the advantages of environmental friendliness, less pollutant discharge, and improved carbon utilization rate. Effect

Active Publication Date: 2013-12-18
CHINA TIANCHEN ENG +1
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Problems solved by technology

[0005] Aiming at the problems of low efficiency of converting carbon into synthesis gas and relatively complicated process in the above lignite gasification, the present invention overcomes the factors that the ash content of lignite is in a solid state, which is not easy to circulate, and the fact that the lignite gasification equipment is in a high

Method used

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  • Novel lignite gasification process by using fluidized bed with ash circulation and equipment of novel lignite gasification process
  • Novel lignite gasification process by using fluidized bed with ash circulation and equipment of novel lignite gasification process
  • Novel lignite gasification process by using fluidized bed with ash circulation and equipment of novel lignite gasification process

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Embodiment 1

[0041] A pilot-scale lignite gasification pilot process for 2.5 kg dry basis per hour, using e.g. figure 2 Air conveyed ash circulation shown.

[0042] The temperature of the gasifier is about 1000°C, and the pressure is 0.3MPa. The dried lignite powder (the coal composition is shown in Table 1, and the particle size is less than 6mm) is sent to the gasifier through the silo, pressurized silo and screw feeder, and through the N1 port of the dry lignite raw material inlet. The cooled circulating synthesis gas enters the bottom of the gasifier through the circulating synthesis gas inlet N7, and the gas volume is adjusted so that the superficial gas velocity is about 0.1m / s. The function of the circulating syngas is to act as a loosening wind, pushing the pulverized coal upwards. The heated oxygen (about 1Nm3 / h) and water vapor (about 1kg / h) enter the gasifier through gasification agent nozzles N2 of different heights, and react with coal powder to generate synthesis gas. The...

Embodiment 2

[0052] The lignite gasification test technique and equipment of the same scale as in Example 1, its main difference adopts such as image 3 Mechanically conveyed ash circulation shown. The circulating ash also flows to the vertical screw feeder ⑥ through the feeding pipe ① at the bottom of the gasifier. After the circulating ash is raised to a certain height, it returns to the gasifier through the inclined pipe ⑦ of the circulating ash returning to the gasifier. In addition, since the screw feeder is not resistant to high temperature, it is necessary to install a cooling jacket (not shown in the figure) outside the feeding inclined tube ①. The mass flow rate of the circulating ash can be controlled by the speed of the vertical screw feeder ⑥.

[0053] The ash circulation fluidized bed lignite gasification process described in the above-mentioned embodiment 1 and embodiment 2 is adopted, and the ash content can be returned to the gasifier to continue burning by using air flow...

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Abstract

The invention discloses a novel lignite gasification process by using a fluidized bed with ash circulation and equipment of the novel lignite gasification process. According to the novel lignite gasification process, a dried lignite raw material is put into a fluidized bed gasification furnace, a gasifying agent is put into the gasification furnace to perform mixed reaction with the lignite, a synthetic gas generated by the reaction between the lignite and the gasifying agent leaves the gasification furnace and flows to a downstream section after being separated and filtered, and separated fine powder returns to the gasification furnace through a pipeline; one part of the ash generated by lignite combustion is returned to the gasification furnace to perform further burning, and the other part of the ash is discharged from the bottom of the gasification furnace; the ash returned to the gasification furnace can be further burnt in two modes including a gas flow conveying mode and a mechanical conveying mode. According to the process disclosed by the invention, two ash circulating modes including the gas flow conveying mode and the mechanical conveying mode are used to ensure that the ash can be returned to the gasification furnace for continuous burning so as to reduce carbon residues on the ash and improve the carbon utilization ratio when the lignite raw material is converted into the synthetic gas. The process and the equipment are simple and reliable, can effectively reduce investment and increase the running reliability, and have environment-friendly effect and less in pollutant discharge.

Description

technical field [0001] The invention relates to the technical field of coal gasification, in particular to a process technology for producing producer gas, water gas and synthesis gas from solid carbonaceous materials, especially lignite. Background technique [0002] my country is rich in lignite resources, with proven reserves of 129.1 billion tons, accounting for about 13% of the country's coal reserves and occupying an important position in my country's coal resources. Effective utilization of lignite resources is of great significance to ensure the stable supply of energy in our country. However, due to the high moisture content, low calorific value, and poor thermal stability of lignite, it is not suitable for long-distance transportation, and it has great limitations as a raw material for large-scale gasification. At present, it is only used as a power fuel in some areas, and the development rate is low. , currently only accounts for 4-5% of the country's coal produc...

Claims

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Application Information

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IPC IPC(8): C10J3/54C10J3/56C10J3/72C10J3/84
CPCY02E20/18
Inventor 钱震王海国刘俊生张蒙陈晨李玉龙刘文王元平石华张舜光左宜赞史文涛马国栋耿玉侠
Owner CHINA TIANCHEN ENG
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