Method for production of 1.0-2.2MPa water gas by fixed bed gasification

Abstract

The invention belongs to the field of coal and coke chemical gasification and discloses a method for production of 1.0-2.2MPa water gas by fixed bed gasification. The method includes steps: adding feed coal and / or coke into a gasification furnace; feeding oxygen and steam into the gasification furnace, wherein the oxygen is 1.2-2.4MPa in pressure, concentration of the oxygen is larger than or equal to 99.6%, and the steam is 240-270 DEG C in average temperature and 1.2-2.2MPa in pressure; controlling the gasification furnace to be 1100-1250 DEG C in internal temperature and 1.0-2.2MPa in pressure, reacting to generate crude gas, washing and cooling to obtain the water gas. The supply quantity of the feed coal and / or coke is 380-420kg per kNm<3> of gas, the oxygen feeding quality is 190-220Nm<3> per kNm<3> of gas, and the steam feeding quantity is 600-650Nm<3> per kNm<3> of gas. By the method for production of 1.0-2.2MPa water gas by fixed bed gasification, the conversion rate of the feed coal and / or coke can be increased to further increase the content of effective ingredients in the gas, and the water gas produced according to the method can be directly sent to a conversion section without compression, so that remarkable energy saving and consumption reduction effects are achieved.

Description

technical field

[0001] The invention relates to a fixed-bed gasification method for producing 1.0-2.2 MPa water gas, which belongs to the field of coal and coke chemical gasification. Background technique

[0002] The coal gasification reaction occurs between carbon and an oxygen-carrying gasification agent (O 2 、H 2 O.CO 2 ) between a chemical reaction. Water gas is widely used. Its main components are hydrogen and carbon monoxide. It was mainly used as gas in the past, but now it is mainly used to prepare chemical products, such as raw material gas for the production of methanol, ethylene glycol, polyols, acetic acid, synthetic ammonia, and combined alkali.

[0003] The development history of coal gasification technology has been more than 100 years, and there are nearly a hundred types of gasifiers. my country also attaches great importance to the research and development of coal gasification technology, and has developed a variety of fixed beds, fluidized beds and ent...

Examples

Embodiment 1

[0029] The method for producing 2.0MPa water gas by continuous gasification of pure oxygen in a fixed bed comprises the following steps:

[0030] With anthracite small lump coal (analysis index sees table 1 below) (383kg / kNm 3 Coal gas) into the gasifier, while the pressure of 2.2MPa of oxygen (202Nm 3 / kNm 3 gas) and external source steam (330kg / kNm 3 Coal gas) and internal source steam with temperature 215℃ and pressure 2.1MPa are passed into the gasifier (the total amount of steam introduced is 633kg / kNm 3 Coal gas), control the temperature in the gasifier to 1100-1200°C, pressure 2.0MPa (pressure measurement on the top of the furnace), and react to generate crude gas with a temperature of about 470°C. After the crude gas is washed and cooled, clean water gas with a temperature of 200°C can be obtained .

[0031] like figure 1 As shown, the water gas production system in this embodiment includes a gasifier 7 , the feed port of the gasifier 7 is connected to the coal fe...

Embodiment 2

[0044] The method for producing 2.0MPa water gas by continuous gasification of pure oxygen in a fixed bed comprises the following steps:

[0045] Small particle coke (analysis index sees table 4 below) (411kg / kNm 3 Coal gas) into the gasifier, while oxygen (219Nm 3 / kNm 3 gas) and external source steam (302kg / kNm 3 coal gas) and internal source steam at a temperature of 215°C and a pressure of 2.1MPa are passed into the gasifier (the total amount of steam introduced is 602kg / kNm 3 Coal gas), control the temperature in the gasifier to 1100-1200°C, pressure 2.0MPa (pressure measurement on the top of the furnace), and react to generate crude gas with a temperature of about 480°C. After the crude gas is washed and cooled, clean water gas with a temperature of 200°C can be obtained . The water gas production system is the same as in Example 1, the water gas composition is shown in Table 5 below, and the gasification reaction consumption index is shown in Table 6 below. Furnace...

technical field

[0001] The invention relates to a fixed-bed gasification method for producing 1.0-2.2 MPa water gas, which belongs to the field of coal and coke chemical gasification. Background technique

[0002] The coal gasification reaction occurs between carbon and an oxygen-carrying gasification agent (O 2 、H 2 O.CO 2 ) between a chemical reaction. Water gas is widely used. Its main components are hydrogen and carbon monoxide. It was mainly used as gas in the past, but now it is mainly used to prepare chemical products, such as raw material gas for the production of methanol, ethylene glycol, polyols, acetic acid, synthetic ammonia, and combined alkali.

[0003] The development history of coal gasification technology has been more than 100 years, and there are nearly a hundred types of gasifiers. my country also attaches great importance to the research and development of coal gasification technology, and has developed a variety of fixed beds, fluidized beds and ent...

Examples

Embodiment 1

[0029] The method for producing 2.0MPa water gas by continuous gasification of pure oxygen in a fixed bed comprises the following steps:

[0030] With anthracite small lump coal (analysis index sees table 1 below) (383kg / kNm 3 Coal gas) into the gasifier, while the pressure of 2.2MPa of oxygen (202Nm 3 / kNm 3 gas) and external source steam (330kg / kNm 3 Coal gas) and internal source steam with temperature 215℃ and pressure 2.1MPa are passed into the gasifier (the total amount of steam introduced is 633kg / kNm 3 Coal gas), control the temperature in the gasifier to 1100-1200°C, pressure 2.0MPa (pressure measurement on the top of the furnace), and react to generate crude gas with a temperature of about 470°C. After the crude gas is washed and cooled, clean water gas with a temperature of 200°C can be obtained .

[0031] like figure 1 As shown, the water gas production system in this embodiment includes a gasifier 7 , the feed port of the gasifier 7 is connected to the coal fe...

Embodiment 2

[0044] The method for producing 2.0MPa water gas by continuous gasification of pure oxygen in a fixed bed comprises the following steps:

[0045] Small particle coke (analysis index sees table 4 below) (411kg / kNm 3 Coal gas) into the gasifier, while oxygen (219Nm 3 / kNm 3 gas) and external source steam (302kg / kNm 3 coal gas) and internal source steam at a temperature of 215°C and a pressure of 2.1MPa are passed into the gasifier (the total amount of steam introduced is 602kg / kNm 3 Coal gas), control the temperature in the gasifier to 1100-1200°C, pressure 2.0MPa (pressure measurement on the top of the furnace), and react to generate crude gas with a temperature of about 480°C. After the crude gas is washed and cooled, clean water gas with a temperature of 200°C can be obtained . The water gas production system is the same as in Example 1, the water gas composition is shown in Table 5 below, and the gasification reaction consumption index is shown in Table 6 below. Furnace...

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