CN101255987A - Double fluidized bed combustion gasification material circulation system - Google Patents

Abstract

The invention discloses a double fluidized bed combustion gasification material circulation system. It includes a fluidized bed gasifier and a circulating fluidized bed combustion furnace; the middle part of the fluidized bed gasifier is connected with the feeding chamber of the return feeder, and then the lower part of the circulating fluidized bed combustion furnace is connected through the discharge chamber of the return feeder The upper part of the circulating fluidized bed combustion furnace is connected with the feed chamber of the two-way feeder through the high-temperature separator, and then divided into two paths, one of which passes through the high-temperature cone valve on the side of the feed chamber of the two-way feeder and the fluidization The lower part of the bed gasification furnace is connected, and the other way is connected with the lower part of the circulating fluidized bed combustion furnace through the return chamber of the two-way material controller. The present invention closely combines the circulating fluidized bed combustion furnace and the fluidized bed gasification furnace to realize the staged transformation of coal gasification combustion in one system and realize the efficient transformation of coal; the system can also be widely used in combustion, gasification Chemical, metallurgical, catalytic and regeneration processes.

Description

Double fluidized bed combustion gasification material circulation system

technical field

The invention relates to a combustion device, in particular to a dual fluidized bed combustion gasification material circulation system.

Background technique

The double fluidized bed system is widely used in combustion, gasification, metallurgy, catalysis and regeneration processes, among which the high-temperature circulating material control between the two furnaces is the key. The existing technology adopts methods such as pneumatic conveying or high-temperature Jiaolong mechanical conveying, and the system is complex , Poor reliability. Especially for the combustion gasification system, it is difficult to realize the circulation flow of a large amount of high-temperature circulating materials between the two furnaces and prevent the coal gas and flue gas from colluding between the two furnaces. On the basis of the existing CFB material circulation control technology, the present invention adopts the method of combining the fluidized bed feeder and the conical control valve to effectively control the solid material circulation of the fluidized bed combustion gasification system, and Prevent gas from collating between the two beds.

Contents of the invention

The purpose of the present invention is to provide a double fluidized bed combustion gasification material circulation system.

The double fluidized bed combustion gasification material circulation system includes a fluidized bed gasifier and a circulating fluidized bed combustion furnace; the middle part of the fluidized bed gasifier is connected with the feed chamber of the return feeder, The discharge chamber of the circulating fluidized bed furnace is connected with the lower part of the circulating fluidized bed combustion furnace; the upper part of the circulating fluidized bed combustion furnace is connected with the feeding chamber of the two-way feeder through a high-temperature separator, and then divided into two paths, one through the two-way feeder The high-temperature cone valve on the side of the feed chamber is connected to the lower part of the fluidized bed gasification furnace, and the other way is connected to the lower part of the circulating fluidized bed combustion furnace through the return chamber of the two-way feeder.

The upper part of the two-way feeder controller is provided side by side with a feed chamber and a return chamber, the bottom of the feed chamber and the return chamber are connected to each other, and the lower part of the two-way feeder controller is provided with a return chamber air chamber and a feed chamber air chamber. , There is a high-temperature cone valve on the side of the feed chamber of the two-way feeder controller. The superficial gas velocity of the feeding chamber is 0.5-2m/s, the superficial gas velocity of the returning chamber is 1-3m/s, and the average flow velocity of the materials in the feeding chamber and the returning chamber is 0.05-0.3m/s .

The upper part of the feeder is provided with a feeding chamber and a discharging chamber side by side, and the lower part of the feeding device is provided with a discharging chamber air chamber and a feeding chamber air chamber side by side. The superficial gas velocity of the feeding chamber is 0.5-2m/s, the superficial gas velocity of the discharging chamber is 1-3m/s, and the average flow velocity of the materials in the feeding chamber and the discharging chamber is 0.05-0.3m/s .

The beneficial effect that the present invention has compared with existing

1) The present invention closely combines the circulating fluidized bed combustion furnace and the fluidized bed gasification furnace to realize the staged transformation of coal gasification combustion in one system, and realize the rational and effective utilization of various components of coal;

2) The two-way material controller adopts the combination of fluidized bed feeder and high-temperature cone valve, which can effectively adjust the amount of material entering the fluidized bed gasifier and circulating fluidized bed combustion furnace, thereby controlling the flow rate of the gasifier and combustion furnace. operating temperature. Simple operation and convenient adjustment;

3) Both the feeder and the two-way feeder are fluidized with steam, and the steam can block the gas communication between the fluidized bed gasifier and the circulating fluidized bed combustion furnace, so as to ensure the reliability of the system operation and adjust the amount of steam And the opening degree of the high-temperature cone valve can control the amount of circulating material between the two furnaces to meet the requirements of the system operation;

4) The system can be widely used in combustion, gasification, metallurgy, catalysis and regeneration processes.

Description of drawings

The accompanying drawing is a schematic diagram of the structure of the dual fluidized bed combustion gasification material circulation system;

In the figure: air 1, circulating fluidized bed combustion furnace 2, high temperature separator 3, high temperature flue gas 4, two-way feeder 5, feeding chamber 6, feeding chamber 7, feeding chamber air chamber 8, feeding chamber Air chamber 9, cone valve 10, steam 11, discharge chamber 12, discharge chamber air chamber 13, steam 14, feed chamber air chamber 15, feeder 16, feed chamber 17, fluidizing gas 18, gas Furnace 19, coal feeding 20, gas 21.

Detailed ways

As shown in the accompanying drawings, the double fluidized bed combustion gasification material circulation system includes a fluidized bed gasification furnace 19 and a circulating fluidized bed combustion furnace 2; The feed chamber 17 is connected, and then the discharge chamber 12 of the feeder is connected with the lower part 2 of the circulating fluidized bed combustion furnace; 6 phases are connected, and then divided into two paths, one path is connected to the lower part of the fluidized bed gasification furnace 19 through the high-temperature cone valve 10 on the side of the feed chamber of the two-way feeder controller, and the other path is passed through the return chamber of the two-way feeder controller 7 is connected with the bottom of circulating fluidized bed combustion furnace 2. Thus forming a double fluidized bed high temperature material circulation system.

The upper part of the two-way feeder 5 is provided side by side with a feed chamber 6 and a return chamber 7, the bottoms of the feed chamber 6 and the return chamber 7 are connected to each other, and the bottom of the two-way feeder 5 is arranged side by side with a return chamber air chamber 8. The air chamber 9 of the feeding chamber and the side of the feeding chamber 6 of the two-way feeder are provided with a high-temperature cone valve 17 . The superficial gas velocity of the feeding chamber is 0.5-2m/s, the superficial gas velocity of the returning chamber is 1-3m/s, and the average flow velocity of the materials in the feeding chamber and the returning chamber is 0.05-0.3m/s .

The upper part of the feeder 16 is provided with a feed chamber 17 and a discharge chamber 12 side by side, and the lower part of the feeder is provided with a discharge chamber wind chamber 13 and a feed chamber wind chamber 15 side by side. The superficial gas velocity of the feeding chamber is 0.5-2m/s, the superficial gas velocity of the discharging chamber is 1-3m/s, and the average flow velocity of the materials in the feeding chamber and the discharging chamber is 0.05-0.3m/s .

The system flow is: the fluidized bed gasifier is blown with fluidized gas, the operating temperature is 600-1000°C, the coal is fed into the fluidized bed gasifier through the feeder, the generated coal gas is discharged from the upper part, and the second half of the gasification is The coke and circulating materials are sent to the circulating fluidized bed combustion furnace through the feeder for burning. The circulating fluidized bed combustion furnace adopts air blast, and the operating temperature is 800-950°C. It burns the semi-coke from the fluidized bed gasifier to generate heat to heat the circulating material from the fluidized bed gasifier through the feeder. , the circulating material is separated by the high-temperature separator at the outlet of the circulating fluidized bed combustion furnace and then enters the two-way feeder, part of it is sent to the fluidized bed gasifier through the high-temperature cone valve to provide gasification and heat absorption, and part of it is passed through the two-way feeder The return chamber returns to the circulating fluidized bed combustion furnace.

The two-way feeder is a double-chamber structure connected with each other, including a feed chamber and a return chamber. A high-temperature cone valve is arranged on the side of the feed chamber. The two-way feeder uses steam blast to separate the high temperature The high-temperature material separated by the separator is sent to the fluidized bed gasifier and the circulating fluidized bed combustion furnace respectively, and at the same time, the gas is prevented from being strung into the high temperature separator from the fluidized bed gasification furnace and the circulating fluidized bed combustion furnace, and the steam can be adjusted The amount and the opening of the high-temperature cone valve are used to adjust the ratio of the circulating materials entering the two furnaces to control the temperature of the fluidized bed gasifier.

The feeder is an interconnected double-chamber structure, including a feeding chamber and a discharging chamber. By using steam blast, the semi-coke and high-temperature materials of the fluidized bed gasifier can be sent to the circulating fluidized bed combustion furnace, and at the same time It prevents the gas from flowing into the fluidized bed gasifier from the circulating fluidized bed combustion furnace, and can adjust the amount of steam to control the amount of circulating materials.

Both the feeder and the two-way feeder of the present invention adopt steam fluidization, adjust the size of the steam volume and the opening of the high-temperature cone valve to control the amount of circulating material, and can effectively isolate the bed gasifier and the circulating fluidized bed Gas collusion between burners.

Claims (5)

1. A double fluidized bed combustion gasification material circulation system is characterized in that comprising a fluidized bed gasification furnace (19) and a circulating fluidized bed combustion furnace (2); the middle part of the fluidized bed gasification furnace and the feeder The feeding chamber (17) of (16) is connected, then is connected with the circulating fluidized bed combustion furnace (2) bottom through the feeder discharge chamber (12); The separator (3) is connected with the feed chamber (6) of the two-way feeder (5), and then divided into two paths, one through the high-temperature cone valve (10) and the feed chamber side of the two-way feeder (5). The lower part of the fluidized bed gasification furnace (19) is connected, and the other way is connected with the lower part of the circulating fluidized bed combustion furnace (2) through the return chamber (7) of the two-way material controller. 2. A kind of dual-fluidized bed combustion gasification material circulation system according to claim 1, characterized in that, the upper part of the two-way feed controller (5) is juxtaposed with a feed chamber (6) and a feed chamber (7), the bottom of the feeding chamber (6) and the feeding chamber (7) are connected to each other, and the lower part of the two-way feeder (5) is arranged side by side with the feeding chamber air chamber (8) and the feeding chamber air chamber (9) , a high-temperature cone valve (17) is provided on the side of the feed chamber (6) of the two-way feeder controller. 3. A dual-fluidized bed combustion gasification material circulation system according to claim 2, characterized in that the superficial gas velocity of the operation of the feed chamber is 0.5-2m/s, and the operation of the return chamber is The superficial gas velocity is 1-3m/s, and the average flow velocity of the material in the feeding chamber and the returning chamber is 0.05-0.3m/s. 4. a kind of dual-fluidized bed combustion gasification material circulation system according to claim 1, is characterized in that, described feeder (16) top is juxtaposed with feed chamber (17) and discharge chamber ( 12), the lower part of the feeder is provided side by side with the discharge chamber air chamber (13) and the feed chamber air chamber (15). 5. A dual-fluidized bed combustion gasification material circulation system according to claim 4, characterized in that, the superficial gas velocity of the operation of the feeding chamber is 0.5-2m/s, and the operation of the discharging chamber is The superficial gas velocity is 1-3m/s, and the average flow velocity of materials in the feeding chamber and the discharging chamber is 0.05-0.3m/s.

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