Dry coal powder entrained bed gasification system and method

Abstract

The invention relates to the technical field of coal gasification, and discloses an entrained-flow bed gasification system and a method for dry pulverized coal. The system comprises a material conveying unit (1), a gasification unit (2) and a steam unit (4), the gasification unit (2) comprises a flat flame type gasification burner (21), a gasification chamber (22), a first heat exchange unit (23)and a slag collecting chamber (24) which are sequentially communicated, and the first heat exchange unit (23) is communicated with the steam unit (4); wherein the flat flame type gasification burner (21) comprises burner units (25) arranged at the top of the gasification unit (2), the flat flame type gasification burner (21) can enable a gasification agent and dry pulverized coal to collide in thegasification chamber (22) and be ignited to form flat flame, and the number of the burner units (25) is larger than or equal to 3. When the system is used for the entrained-flow bed gasification process of dry pulverized coal, the heat efficiency of the system can be remarkably improved, and meanwhile specific oxygen consumption and specific coal consumption are reduced.

Description

technical field

[0001] The invention relates to the technical field of coal gasification, in particular to an entrained gasification system and method for dry coal powder. Background technique

[0002] Energy is an important basis for human survival and development. The energy structure of "lack of oil and gas" forces my country to spend huge costs every year to purchase large quantities of gas and liquid fuels from abroad to meet the needs of domestic economic and social development, which makes it difficult to guarantee my country's energy security. On the other hand, my country is a relatively "coal-rich" country. The proven reserves of coal in my country account for 13.3% of the world's proven reserves. This unique energy structure determines that my country is a country that consumes coal as the main energy source. Coal gasification is a key technology and common technology for the green, efficient and clean transformation of coal, and the development of its technology p...

Examples

Embodiment 1

[0200] This embodiment combines figure 1 , Table 1 is the coal quality analysis data of the dry coal powder used in this embodiment.

[0201]In this embodiment, the operating conditions of the gasification unit are: pressure 4.0MPa, reaction temperature 1400°C; the height-to-diameter ratio of the gasification chamber 22 is 2:1; the processing capacity of the gasification unit is 2000 tons / day; flat flame type The gasification burner includes three burner units evenly spaced along the circumference, and each burner unit has a dry coal powder channel in the center and 3 gasification agent channels around the dry coal powder channel; the impact point The distance (CP) from the end face of the flat-flame gasification burner 21 is 25.68 mm, the distance (OC) from the center of the gasification agent of the burner to the outlet center of the dry coal powder is 12.5 mm; the speed of the dry coal powder when it leaves the burner unit 9m / s, and the velocity of the gasification agent w...

Embodiment 2

[0212] The system and method of this embodiment are the same as those of Embodiment 1, but the aspect ratio of the gasification chamber is 0.5:1.

[0213] Table 1 is the coal quality analysis data of the dry coal powder used in this embodiment. After continuous and stable operation, the system was analyzed, and the results are shown in Table 2.

Embodiment 3

[0215] The system and method of this embodiment are the same as in Embodiment 1, but the number of burner units is ten.

[0216] Table 1 is the coal quality analysis data of the dry coal powder used in this embodiment. After continuous and stable operation, the system was analyzed, and the results are shown in Table 2.

technical field

[0001] The invention relates to the technical field of coal gasification, in particular to an entrained gasification system and method for dry coal powder. Background technique

[0002] Energy is an important basis for human survival and development. The energy structure of "lack of oil and gas" forces my country to spend huge costs every year to purchase large quantities of gas and liquid fuels from abroad to meet the needs of domestic economic and social development, which makes it difficult to guarantee my country's energy security. On the other hand, my country is a relatively "coal-rich" country. The proven reserves of coal in my country account for 13.3% of the world's proven reserves. This unique energy structure determines that my country is a country that consumes coal as the main energy source. Coal gasification is a key technology and common technology for the green, efficient and clean transformation of coal, and the development of its technology p...

Examples

Embodiment 1

[0200] This embodiment combines figure 1 , Table 1 is the coal quality analysis data of the dry coal powder used in this embodiment.

[0201]In this embodiment, the operating conditions of the gasification unit are: pressure 4.0MPa, reaction temperature 1400°C; the height-to-diameter ratio of the gasification chamber 22 is 2:1; the processing capacity of the gasification unit is 2000 tons / day; flat flame type The gasification burner includes three burner units evenly spaced along the circumference, and each burner unit has a dry coal powder channel in the center and 3 gasification agent channels around the dry coal powder channel; the impact point The distance (CP) from the end face of the flat-flame gasification burner 21 is 25.68 mm, the distance (OC) from the center of the gasification agent of the burner to the outlet center of the dry coal powder is 12.5 mm; the speed of the dry coal powder when it leaves the burner unit 9m / s, and the velocity of the gasification agent w...

Embodiment 2

[0212] The system and method of this embodiment are the same as those of Embodiment 1, but the aspect ratio of the gasification chamber is 0.5:1.

[0213] Table 1 is the coal quality analysis data of the dry coal powder used in this embodiment. After continuous and stable operation, the system was analyzed, and the results are shown in Table 2.

Embodiment 3

[0215] The system and method of this embodiment are the same as in Embodiment 1, but the number of burner units is ten.

[0216] Table 1 is the coal quality analysis data of the dry coal powder used in this embodiment. After continuous and stable operation, the system was analyzed, and the results are shown in Table 2.

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