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Desulfurization process and device with zero wastewater discharge

A desulfurization process and desulfurization device technology are applied in the field of desulfurization process with zero discharge wastewater, which can solve the problems of increasing costs, increasing the external drainage volume of the desulfurization system, affecting the quality and moisture content of gypsum of desulfurization products, and achieving the goal of reducing the moisture content and improving the quality. Effect

Active Publication Date: 2019-04-19
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above-mentioned patents have been applied to a certain extent in coal-fired boilers, but there are still some problems, which affect the quality of fly ash and the stability of the desulfurization system. The amount of external drainage increases the cost of subsequent wastewater softening. The dust in the flue gas affects the quality and moisture content of the desulfurization product gypsum. The ions in the desulfurization wastewater are transferred to other water bodies, etc.

Method used

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  • Desulfurization process and device with zero wastewater discharge
  • Desulfurization process and device with zero wastewater discharge
  • Desulfurization process and device with zero wastewater discharge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] The initial flue gas volume of a 35t / h coal-fired chain furnace is 59854Nm3 / h, and the HCl content in the flue gas is 110mg / Nm 3 , the flue gas enters the existing desulfurization process after going through the hydrogen chloride absorption process, and the desulfurization tower design column slurry is 48m 3 , the control concentration of chlorine ion in the wastewater discharged from the desulfurization tower is 20000mg / l. The pH value of the circulating absorption solution in the hydrogen chloride absorption process is 4, and the pH regulator is 15% sodium hydroxide solution, as shown in Table 1:

[0080] Table 1

[0081]

[0082] The salt content of the hydrogen chloride absorption liquid is 15% and the waste water discharged from the desulfurization tower undergoes pretreatment, ultrafiltration, ion exchange, electrodialysis and other processes to prepare the waste water into acid and alkali.

Embodiment 2

[0084] The initial flue gas volume of a 35t / h coal-fired chain furnace is 59560Nm3 / h, and the HCl content in the flue gas is 80mg / Nm 3 , the flue gas enters the existing desulfurization process after going through the hydrogen chloride absorption process, and the desulfurization tower design column slurry is 48m 3 , the control concentration of chlorine ion in the wastewater discharged from the desulfurization tower is 20000mg / l. In the hydrogen chloride absorption process, the pH value of the circulating absorption liquid is controlled to be 3, and the pH regulator is 5% sodium hydroxide solution, as shown in Table 2:

[0085] Table 2

[0086]

[0087] The salt content of the hydrogen chloride absorption liquid is 5% and the wastewater discharged from the desulfurization tower undergoes pretreatment, ultrafiltration, ion exchange, electrodialysis and other processes to prepare the discharged wastewater into acid and alkali.

Embodiment 3

[0089] The initial flue gas volume of a 35t / h coal-fired chain furnace is 60125Nm3 / h, and the HCl content in the flue gas is 80mg / Nm 3 , the flue gas enters the existing desulfurization process after going through the hydrogen chloride absorption process, and the desulfurization tower design column slurry is 48m 3 , the control concentration of chlorine ions in the wastewater discharged from the desulfurization tower is 10000mg / l. The pH value of the circulating absorption solution in the hydrogen chloride absorption process is 3.5, and the pH regulator is 10% sodium hydroxide solution, as shown in Table 3:

[0090] table 3

[0091]

[0092] The salt content of the hydrogen chloride absorption liquid is 10% and the waste water discharged from the desulfurization tower undergoes pretreatment, ultrafiltration, ion exchange, electrodialysis and other processes to prepare the discharged waste water into acid and alkali.

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Abstract

The invention discloses a desulfurization process and device with zero wastewater discharge. The process includes the following steps: (1) flue gas of coal-fired boiler is sent to a hydrogen chlorideabsorption process through a dust collector and an induced draft fan in order, an absorption liquid in the hydrogen chloride absorption process cyclically sprays and absorbs hydrogen chloride gas anddust in the flue gas and the purified flue gas is discharged from a chimney after desulfurization; (2) the flue gas after the removing of the dust and hydrogen chloride in the flue gas enters a desulfurization tower for desulfurization, a filtrate is returned to the desulfurization tower after gypsum slurry discharged from the desulfurization tower is dehydrated, and zero discharge of desulfurization tower wastewater is realized; and (3) wastewater discharged from the hydrogen chloride absorption process is prepared into an acid and a base used in a return system after initial sedimentation, neutralization, softening, flocculation, sedimentation, ultrafiltration, deep softening, and bipolar membrane electrodialysis. The wastewater discharged from the hydrogen chloride absorption tower of the invention is prepared into the acid and alkali for reuse, the desulfurization tower does not produce discharged wastewater, and the desulfurization process of the invention is an energy-saving andconsumption-reducing process that an absorbent is recycled.

Description

technical field [0001] The invention relates to the technical field of air pollution control and wastewater treatment, in particular to a desulfurization process for zero-discharge wastewater. Background technique [0002] my country is the world's largest coal producer and consumer, and coal still accounts for a large proportion of my country's energy structure. For many years, coal has accounted for more than 75% of my country's total primary energy consumption. It is estimated that coal will still account for about 70% of total energy consumption in the next 10 years. And the consumption pattern will not change. The energy consumption structure dominated by coal is the most important reason for the increasingly serious pollution in our country. [0003] Most of the desulfurization technology of coal-fired power plants adopts the limestone-gypsum flue gas desulfurization technology, which has the advantages of high desulfurization efficiency, reliable operation, wide appl...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50C02F9/12C02F11/122B01D47/06C02F103/18
CPCB01D47/06B01D53/18B01D53/50B01D53/78B01D2257/2025C02F1/42C02F1/442C02F1/444C02F1/4693C02F1/52C02F1/66C02F9/00C02F11/122C02F2001/007C02F2103/18
Inventor 王岳军寿冬金陈美秀周紫薇梁平
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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