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Discharged material return circulation control device for fluidized coal gasifier and application thereof

A fluidized bed gasification furnace, cycle control technology, applied in the direction of fluidized bed combustion equipment, burning fuel in a molten state, lighting and heating equipment, etc., can solve the problem of regulation performance and service life limitations, difficulty in starting and controlling, and impossibility To solve problems such as material sealing, achieve the effect of meeting high temperature and high pressure material cycle control, wide cycle rate range, and preventing gas short circuit

Active Publication Date: 2011-05-25
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The fluidized bed gasification furnace is different from the combustion furnace (boiler). The material brought out is coal semi-coke with high carbon content and low cycle rate. Both mechanical valves and air control valves are used in the feeding device, each with its own advantages and disadvantages
The advantages of mechanical valves are excellent adjustment characteristics and flexible operation control adjustment; however, due to the long-term adjustment of powder material flow in high temperature and high pressure environments, jamming and abrasion are prone to occur, and the adjustment performance and service life are limited.
The air control valve adopts different inflation methods and adjusts the amount of inflation to control the opening and closing of the return device and adjust the material flow, which prolongs the service life of the valve and makes it easier to manufacture the valve. Therefore, it has been widely used in circulating fluidized bed combustion systems. application; however, the gas control valve has poor sealing performance and cannot be used as a material seal, especially when it is difficult to start and control under large pressure difference and low cycle rate (the ratio of cycle rate to gasifier feed rate), In addition, the structure of the existing air control valve cannot meet the requirements of high pressure

Method used

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  • Discharged material return circulation control device for fluidized coal gasifier and application thereof
  • Discharged material return circulation control device for fluidized coal gasifier and application thereof
  • Discharged material return circulation control device for fluidized coal gasifier and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The feed rate of the gasifier is 2000kg / h, and the circulation rate of the material in the standpipe is required to be 2±1, and the circulation rate is 2000-6000kg / h. The operation is as follows: when the fluidized bed gasifier starts to operate, the cyclone separation The high-temperature and high-pressure ash of the device flows downward through the standpipe 1, firstly close the mechanical valve 4 to accumulate the material level; measure the pressure of the two pressure measuring ports 2, when the pressure difference between the two pressure measuring ports is 0.2-0.3kPa At this time, water is passed into the heat exchanger 18, and the mechanical valve 4 is opened by 40%. state, the fluidizing gas volume is 120Nm 3 / h, then the gas enters the loosening air chamber 10 from the loosening air pipe 11 to loosen the material in the material supply chamber 6, and the loosening gas volume is 110Nm 3 / h, the gas entering from the side blowing pipe 9 transports the material...

Embodiment 2

[0041] The feed rate of the gasifier is 1000kg / h, and the circulation rate of the material in the standpipe is required to be 8±1, and the circulation rate is 7000-9000kg / h. The operation is as follows: when the fluidized bed gasifier starts to operate, the cyclone separation The high-temperature and high-pressure ash of the device flows downward through the standpipe 1, firstly close the mechanical valve 4 to accumulate the material level; measure the pressure of the two pressure measuring ports 2, when the pressure difference between the two pressure measuring ports is 0.5-0.6kPa At this time, water is passed into the heat exchanger 18, and the mechanical valve 4 is opened by 70%. state, the fluidizing gas volume is 500Nm 3 / h, then the gas enters the loosening air chamber 10 from the loosening air pipe 11 to loosen the material in the material supply chamber 6, and the loosening gas volume is 400Nm 3 / h, the gas entering from the side blowing pipe 9 transports the material...

Embodiment 3

[0049] The feed rate of the gasifier is 800kg / h, the circulation rate of the material in the standpipe is required to be 16±1, and the circulation rate is 12000-13600kg / h. The operation is as follows: when the fluidized bed gasifier starts to operate, the cyclone separation The high-temperature and high-pressure ash of the device flows downward through the standpipe 1, firstly close the mechanical valve 4 to accumulate the material level; measure the pressure of the two pressure measuring ports 2, when the pressure difference between the two pressure measuring ports 2 is 0.5-0.6 At kPa, feed water into the heat exchanger 18, and open the mechanical valve 4 at 100%. fluidized state, fluidizing gas volume is 650Nm 3 / h, then the gas enters the loosening air chamber 10 from the loosening air pipe 11 to loosen the material in the material supply chamber 6, and the loosening gas volume is 530Nm 3 / h, the gas entering from the side blowing pipe 9 transports the material in the mate...

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Abstract

The invention discloses a discharged material return circulation control device for a fluidized coal gasifier, comprising pressure measuring holes (2), a heat exchanger (18), temperature measuring holes (3), a mechanical valve (4) and a pneumatic control valve (17). The device is characterized in that a vertical tube (1) is provided with two pressure measuring holes (2), the heat exchanger (18) and two temperature measuring holes (3); the heat exchanger (18) is provided with a water inlet (19) and a water outlet (20); a first temperature measuring hole is arranged above the heat exchanger (18); a second temperature measuring hole is arranged below the heat exchanger (18); the two pressure measuring holes (2) are positioned above the first temperature measuring hole; the lower end of the vertical tube (1) is connected with the mechanical valve (4); and the lower end of the mechanical valve (4) is connected with the pneumatic control valve (17) through a charge tube (5). The device has the advantages of being simple in structure and simple and convenient for operation, and is suitable for the discharged material return demand of the fluidized coal gasifier in various conditions.

Description

technical field [0001] The invention belongs to a circulating device for returning material brought out of a fluidized bed gasification furnace under high pressure, high temperature and various conditions and its application. technical background [0002] As a new generation of clean coal technology, fluidized bed gasification technology has been widely used all over the world, and is currently developing towards large-scale pressurization. With the increase of the processing capacity of the pressurized gasifier, the amount of semi-coke fine powder brought out from the top of the fluidized bed gasifier increases accordingly. In order to solve the gasification efficiency of the semi-coke fine powder in the fluidized bed gasifier, it is necessary to bring the material out of the gasifier back to the furnace many times to improve its conversion efficiency. [0003] The fine powder circulation in the fluidized bed gasifier depends on the solid particle circulation system to con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/28
Inventor 黄戒介王毅房倚天曹永坤李春玉赵宵鹏程中虎韦锐王洋任江萍徐奕丰王鸿瑜白秀钢
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI