Method for deep water removal from high humidity flue gas

A flue gas and removal technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problem of increased energy consumption in the regeneration process of carbon capture absorbents or adsorbents, without considering that the performance of the adsorbents will increase with time. Time decline, flue gas humidity decline and other problems, to achieve good water removal effect, reduce water content, reduce water removal load effect

Active Publication Date: 2022-04-26
GUODIAN NEW ENERGY TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the operation steps of this system are complicated, and the problem that the performance of the adsorbent will decline over time during long-term operation is not considered, and the operating cost is relatively high.
[0006] In summary, there are many defects in the flue gas dehydration methods currently used in industrial applications. If the humidity of the flue gas cannot be further reduced, after entering the carbon capture process, the energy consumption of the carbon capture absorbent or the regeneration process of the adsorbent will be greatly increased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0048] In a specific embodiment, the flue gas from which the liquid droplets have been removed is passed into the shell side of the tubular heat exchanger for cooling, and circulating cooling water is passed into the tube side of the tubular heat exchanger.

[0049] Preferably, the flue gas from which the liquid droplets have been removed undergoes the first dehydration, and the temperature drops by 3-7°C.

[0050] According to the present invention, preferably, during the first dehydration process, the content of at least one of the dust, sulfur oxides, and nitrogen oxides is simultaneously reduced.

[0051] In a specific embodiment, the flue gas from the removal of liquid droplets is passed into the shell side of the tubular heat exchanger for cooling, and at least one of the dust, sulfur oxides, and nitrogen oxides enters the removal water, thereby reducing the content of at least one of the dust, sulfur oxides, and nitrogen oxides in the crude dehydrated flue gas.

[0052...

Embodiment approach

[0058]In the present invention, in a preferred embodiment, the crude dehydrated flue gas is passed into a silica gel adsorption tower, and silica gel is used for the second dehydration. In the embodiments of the present invention, the silica gel of the model Sorbead R+ produced by BASF is taken as an example for illustration, and the present invention is not limited thereto.

[0059] In order to improve the utilization rate of resources, the adsorbed silica gel is regenerated at high temperature, and the regenerated silica gel is circulated for second dehydration.

[0060] Preferably, the adsorption saturation of the adsorbent for water is 5-45% by weight, preferably 15-30% by weight. Specifically, for example, an adsorption saturation of 20% by weight means that when 1 kg of the adsorbent reaches the adsorption saturation state, the weight of the adsorbed water is 0.2 kg.

[0061] The present invention has no special limitation on the amount of the adsorbent, and those skill...

Embodiment 1

[0087] According to the method for removing water from flue gas provided by the present invention, the flue gas is dewatered, and the specific steps include:

[0088] (1) Set the volume flow rate to 200Nm 3 The flue gas of / h is passed into the steam-water separator for gas-liquid separation, and the liquid droplets therein are removed; the temperature of the flue gas is 50° C., and the water content in the flue gas is 14.3% by weight, and the carbon dioxide in the flue gas The content is 14.5% by weight;

[0089] (2) The flue gas from which liquid droplets have been removed is passed into the tubular heat exchanger for the first dehydration. During the first dehydration, the trace dust, sulfur oxides, and nitrogen oxides in the flue gas condense to the tube wall to obtain Crude dehydrated flue gas; the water content of the crude dehydrated flue gas is 10.4% by weight, and the temperature is 45°C;

[0090] The dust content in the crude dehydrated flue gas is 6ppm, the conten...

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PUM

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Abstract

The invention relates to the field of flue gas dehydration, and discloses a method for dewatering flue gas, the method comprising: (1) performing gas-liquid separation on the flue gas to remove liquid droplets; (2) separating the flue gas from the liquid droplets (3) Carrying out the first dehydration of the gas to obtain the crude dehydration flue gas; (3) performing the second dehydration of the crude dehydration flue gas to obtain the fine dehydration flue gas; (4) performing the third dehydration of the fine dehydration flue gas to obtain the deep dehydration flue gas; The temperature of the flue gas is 45-55°C, the water content in the flue gas is 12-18% by weight; the water content in the crude dehydrated flue gas is 8-15% by weight; the dew point of the refined dehydrated flue gas The temperature is -40°C to -25°C; the dew point temperature of the deep dehydrated flue gas is -60°C to -40°C. The method provided by the invention is economical and practical, has good water removal effect and can run stably for a long time.

Description

technical field [0001] The invention relates to the field of flue gas water removal, in particular to a method for flue gas water removal. Background technique [0002] The tail flue gas of thermal power plants and other fossil fuel boilers is saturated wet flue gas after passing through desulfurization towers, wet electrostatic precipitators and other devices. The temperature of the saturated wet flue gas is between 45-55 ° C and contains a large number of liquid droplets . If this part of the flue gas is directly applied to the subsequent carbon capture process, the unremoved moisture will increase the energy consumption of the carbon capture process and aggravate equipment corrosion, which is neither economical nor conducive to the long-term operation of the device. [0003] CN109157941A discloses a coal-fired power plant flue gas dehumidification and emission reduction system. The system performs dust removal, desulfurization and dehumidification on the flue gas in sequ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/26B01D53/28
CPCB01D53/28B01D53/26B01D53/261B01D53/265
Inventor 常超杨阳孙振新徐冬高腾飞徐妍
Owner GUODIAN NEW ENERGY TECH INST
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