A kind of syngas scrubbing process

Abstract

The invention discloses a washing treatment process for synthesis gas. The washing treatment process comprises the following steps: after black water from a shock chilling chamber of a gasification furnace is filtered and ash dreg is removed, the black water enters a buffering pot; after shock chilling water from the buffering pot passes through a circulating pump, the shock chilling water enters the shock chilling chamber of the gasification furnace; after synthesis gas is contacted with introduced washing water by a washing tower and enters a follow-up conversion working section after being contacted with converted condensing water and desalting and oxygen-removing water for dust removal; part of the washing water from the washing tower enters the shock chilling chamber of the gasification furnace; after dreg is filtered by a filter, the black water from the washing tower and the other part of the washing water are combined and then enter the buffering pot; after the washing water from the buffering pot is pressurized by a circulating pump, part of the washing water enters a venturi scrubber and the other part of the washing water enters the washing tower to be circularly used. According to the washing treatment process for the synthesis gas, the black water is not discharged out so that the pollution and the water consumption can be relieved; the wastewater discharge is reduced by 0.36 ton; the operation period of a device is prolonged and the treatment of ash water is very simple and common; the ash water does not need to be subjected to temperature reduction treatment so that the system has the relatively high water vapor content and the temperature of the synthesis gas is increased; the washing treatment process of the synthesis gas is good for the follow-up conversion working section.

Description

technical field

[0001] The invention relates to a method for washing syngas of a coal gasification device, treating gray water and recycling it, in particular to a gray water graded utilization treatment method. technical background

[0002] The synthesis gas of pulverized coal gasification or pressurized continuous gasification of coal-water slurry has a high temperature and contains a large amount of solid particles. In order to recover waste heat and prevent the adverse effects of solid particles on subsequent sections, chilling and washing processes are often used. Water quenching means that the syngas is fully contacted with a large amount of low-temperature water in the quenching chamber, and at the same time, the syngas is humidified to increase its water vapor content, which is used for the transformation of the subsequent section; Some solid particles. A typical process such as figure 1 shown.

[0003] from figure 1 It can be seen that the most classic is Texaco...

Examples

Embodiment Construction

[0022] like figure 2 Shown, the coal gasification plant gray water treatment method process of the present invention is as follows:

[0023] a. The black water leaving the quenching chamber 1 of the gasifier is not subjected to decompression treatment nor lowered in temperature, and enters the quenching water buffer tank 14 after directly passing through the quenching water filter 5 to filter the ash, and the quenching water exiting the quenching water buffer tank 14 passes through After the quenching water circulation pump 15 is pressurized, the gray water in the quenching water buffer tank 14 is pumped into the quenching chamber 1 of the gasifier for recycling to complete a cycle, and most of the ash filtered out by the quenching water filter 5 before the quenching water buffer tank 14 The slag is sent to the slag removal machine through the outlet at the bottom of the chilled water filter 5 for slag water treatment;

[0024] b. The synthesis gas coming out of the quenchin...

technical field

[0001] The invention relates to a method for washing syngas of a coal gasification device, treating gray water and recycling it, in particular to a gray water graded utilization treatment method. technical background

[0002] The synthesis gas of pulverized coal gasification or pressurized continuous gasification of coal-water slurry has a high temperature and contains a large amount of solid particles. In order to recover waste heat and prevent the adverse effects of solid particles on subsequent sections, chilling and washing processes are often used. Water quenching means that the syngas is fully contacted with a large amount of low-temperature water in the quenching chamber, and at the same time, the syngas is humidified to increase its water vapor content, which is used for the transformation of the subsequent section; Some solid particles. A typical process such as figure 1 shown.

[0003] from figure 1 It can be seen that the most classic is Texaco...

Examples

Embodiment Construction

[0022] like figure 2 Shown, the coal gasification plant gray water treatment method process of the present invention is as follows:

[0023] a. The black water leaving the quenching chamber 1 of the gasifier is not subjected to decompression treatment nor lowered in temperature, and enters the quenching water buffer tank 14 after directly passing through the quenching water filter 5 to filter the ash, and the quenching water exiting the quenching water buffer tank 14 passes through After the quenching water circulation pump 15 is pressurized, the gray water in the quenching water buffer tank 14 is pumped into the quenching chamber 1 of the gasifier for recycling to complete a cycle, and most of the ash filtered out by the quenching water filter 5 before the quenching water buffer tank 14 The slag is sent to the slag removal machine through the outlet at the bottom of the chilled water filter 5 for slag water treatment;

[0024] b. The synthesis gas coming out of the quenchin...

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