Method for treating black water of coal gasification system

A treatment method and coal gasification technology, applied in the manufacture of combustible gas, petroleum industry, etc., can solve the problems of low water vapor in syngas, large amount of circulating cooling water, and large material flow, so as to improve the water-gas ratio, reduce power consumption, The effect of efficient use of matter and energy

Active Publication Date: 2014-04-02
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the low operating pressure of the evaporative hot water tower, the temperature of the syngas scrubbing water is low, and finally the water vapor ratio of the syngas exiting the water scrubber is relatively low; at the same time, the material flow of the black water exiting the evaporative hot water tower is relatively large, After the further flashing of the stream, the amount of circulating cooling water consumed by the condensation of the flashing low-pressure steam is large

Method used

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  • Method for treating black water of coal gasification system
  • Method for treating black water of coal gasification system
  • Method for treating black water of coal gasification system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] For hydrogen production units that use a mixture of petroleum coke and coal as raw materials, wet-feed gasification technology is used. The pressure of the gasifier is 6.5MPaG, the temperature is 1300°C, the slurry concentration is 63%, and the effective gas (CO+H 2 ) output is 100000Nm 3 / h, the gasifier is lined with refractory bricks. Table 1 shows the analytical data after mixing petroleum coke and coal. Table 2 is the main gasification process indicators.

[0044] Table 1 Analytical data after mixing petroleum coke and coal

[0045] Industrial Analysis

Mar,wt%

10.63

FCd,wt%

85.93

Vd,wt%

11.24

Ad,wt%

2.84

Elemental analysis

Cd,wt%

84.58

Hd,wt%

4.13

[0046] Nd,wt%

1.40

Sd,wt%

4.16

Od,wt%

2.88

[0047] Table 2 Main gasification process indicators

[0048] carbon conversion rate

%

97

Effective gas...

Embodiment 2

[0058] For hydrogen production units that use coal as raw material, dry feed gasification technology is used. The pressure of the gasifier is 4.0MPaG, the temperature is 1344°C, the pulverized coal uses nitrogen as the transport medium, and the effective gas (CO+H 2 ) output is 60000Nm 3 / h, the gasifier adopts water-cooled wall lining. Table 5 is the analysis data of pulverized coal into the furnace, and Table 6 is the main gasification process indicators.

[0059] Table 5 Pulverized coal analysis data

[0060] Industrial Analysis

[0061] Table 6 Main gasification process indicators

[0062] carbon conversion rate

[0063] Using the solid-liquid separator of the treatment method of the present invention to separate black water, the high-temperature gray water flow rate for direct reuse is 50% of the total amount of black water in the chilling chamber, cyclone separator, and water washing tower, and the solid separation efficiency is 85%. Table 7 and T...

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Abstract

The invention discloses a method for treating black water of a coal gasification system. At least partial high-temperature black water is directly returned to a synthetic gas washing tower for being recycled after being de-ashed, and directly pumped to the synthetic gas washing tower as synthetic gas washing water after carried fine ash is separated through a solid-liquid separator. The water-air ratio of synthetic gas discharged from the gasification device is increased, the operation of a CO transformation device is facilitated, the energy of the gasification device is recycled through a byproduct steam, the CO transformation device also returns much transformation condensate to the synthetic gas washing tower, so that the washing effect of the synthetic gas discharged from the gasification device is ensured; and the amount of the black water of a black water removing treatment unit is reduced, and the power consumption, equipment size and investment of the black water treatment unit are reduced. According to the method provided by the invention, the synthetic gas in the gasification system is washed, the black water is treated, and thus the purpose of effectively utilizing materials and energy is achieved.

Description

technical field [0001] The invention relates to a treatment method for black water in a coal gasification system, in particular to a method of directly returning at least part of the high-temperature black water to a syngas scrubber for recycling, so as to reduce the high-level energy loss of the gasification system and improve the gasification efficiency. The water-gas ratio of the system synthesis gas (that is, the ratio of the volume flow of water vapor in the synthesis gas to the volume flow of dry gas) and the method of reducing the consumption of circulating cooling water in the black water treatment unit. technical background [0002] The entrained bed gasification process of solid or liquid carbonaceous materials mainly includes three units: gasification of solid or liquid carbonaceous materials, synthesis gas treatment and black water treatment. [0003] Solid or liquid carbonaceous raw materials and gasification agent (air, oxygen-enriched air or oxygen) are reacte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/72
Inventor 代正华龚欣于广锁周志杰王辅臣刘海峰王亦飞陈雪莉李伟锋梁钦锋郭晓镭许建良郭庆华王兴军李超
Owner EAST CHINA UNIV OF SCI & TECH
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