A circulating fluidized bed gasification system and its gasification method
A technology of circulating fluidized bed and gasification system, applied in the field of coal gasification, can solve the problems of low reliability, bad operating conditions, difficult post-processing, etc., so as to reduce equipment operation and maintenance costs, improve energy utilization efficiency, The effect of simplifying the purification and dust removal process
Active Publication Date: 2022-03-22
SHANGHAI BOILER WORKS
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Problems solved by technology
[0006] 3. The calorific value of the output syngas is high, and the system efficiency is low;
[0009] 1. The bed height fluctuates greatly in the pressurized fluidized bed gasifier, and the carbon conversion rate is low;
[0010] 2. After fluidized bed gasification, the product entrains a large amount of particulate matter, and the service life of waste heat recovery equipment is short;
[0011] 3. Fluidized bed gasification mostly adopts the recycling method, and the design of high-efficiency cyclone separator is difficult;
[0012] 4. Fluidized bed gasification and slagging design is unique, the operating conditions are harsh, and the reliability is low;
[0014] 6. After fluidized bed gasification, the content of residual carbon in fly ash is relatively high, the particle size is relatively small, and post-processing is difficult
Method used
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Embodiment 1
[0053] Take a circulating fluidized bed gasification process system with a daily coal processing capacity of 500 tons (air-dry basis) as an example. The coal quality data of fuel coal are shown in Table 1. The design parameters of the gasification reaction device are as follows:
[0054] Operating pressure: 0.3MPaG;
[0055] Operating temperature: 1000°C;
[0056] Gasification agent: enriched oxygen 35% and water vapor;
[0057] Particle size of crushed coal fuel: 0-10mm, average particle size 6mm, accounting for 80% of the total mass;
[0058] Pulverized coal fuel particle size: 0~200μm, average particle size 65μm, 15% of the total mass, using N 2 delivery;
[0059] All the fly ash is sent to the boiler for combustion.
[0060] Gasification agent distribution: center jet gasification burner accounts for 50%, air distribution plate 25%, second stage burner chamber 15%, slag discharge pipe 10%;
[0061] Slagging temperature: 950°C;
[0062] Oxygen-enriched air is prehea...
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Abstract
The invention discloses a circulating fluidized bed gasification system and a gasification method thereof, including a fuel crushing and feeding system, a fluidized bed gasification system, a slag discharge system, a synthetic gas waste heat recovery system, and fly ash removal and recycling transportation and utilization system, crude gas purification distribution system, etc. The invention adopts the full waste heat recovery system and the fly ash reuse system, the sensible heat of synthesis gas gasification is all used to generate saturated water vapor and superheated steam, and the fly ash can be recycled to the furnace for gasification and sent to the boiler for combustion. It maximizes energy utilization efficiency and minimizes water resource consumption. It is suitable for industrial fuel gas preparation systems such as ceramics, industrial furnaces, glass furnaces, and steelmaking. It has broad prospects for becoming the mainstream technology of coal-based fuel gas stations.
Description
technical field [0001] The invention relates to a circulating fluidized bed gasification system and a gasification method thereof, belonging to the technical field of coal gasification. Background technique [0002] Low-rank coal reserves such as lignite are abundant in the world. At present, my country's low-rank coal resources such as lignite account for about 55% of the country's proven coal reserves, and more than 80% of the coal stock in Southeast Asia is lignite. In addition, Australia, Africa and other places also have abundant reserves. low-rank coals such as lignite. Low-rank coals such as lignite have the remarkable characteristics of low heat, high water, and high volatile matter, and some lignites are also accompanied by low ash and high sulfur characteristics. At present, lignite is mainly used for power generation through fluidized bed boilers and pulverized coal furnaces, among which fluidized bed boilers are more commonly used, and a small amount of coal with...
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IPC IPC(8): C10J3/56C10J3/84C10J3/72
CPCC10J3/56C10J3/72C10J3/84C10J2300/093C10J2300/1603C10J2300/1631Y02P20/129Y02P20/10
Inventor 倪建军江晶亮池国镇
Owner SHANGHAI BOILER WORKS