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Regeneration cycling method of flue gas desulfurizing agent

A technology of desulfurization agent and flue gas, which is applied in the field of industrial wastewater utilization, can solve the problems of expanding the universality of desulfurization by sodium bicarbonate method, difficulty in crystallization and sweating rate, and high precision requirements of the control system, so as to make up for the high cost of desulfurization, simple method, Overcoming the effect of high precision requirements

Inactive Publication Date: 2016-04-20
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The regeneration process and the by-product utilization method require high precision of the control system, consume heat energy, the rate of crystallization and sweating is difficult to effectively control, and the recyclability is not strong. Therefore, it is very meaningful for the regeneration of the desulfurizer sodium bicarbonate and the utilization of by-products issues, thereby reducing costs and expanding the universality of desulfurization with sodium bicarbonate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Fill the strong alkali gel styrene resin LXI-201 (manufacturer: Xi'an Lanxiao Technology New Materials Co., Ltd.) into the exchange column by wet method, and first wash it with deionized water at a flow rate of 6BV / h Resin until the pH of the effluent is 7-9, then rinse the resin with a volume of 4BV of ammonium bicarbonate solution with a molar concentration of 1mol / L at a flow rate of 1.5BV / h, and finally wash with deionized water at a flow rate of 6BV / h Resin until the pH value of the effluent is 7-9 to obtain HCO 3 - type anion exchange resin.

[0030] 2) HCO 3 - Type anion exchange resin is filled in the anion exchange column by wet method. At room temperature, the mixed solution of sodium bicarbonate desulfurization product sodium sulfate and sodium bicarbonate is passed through the resin bed at a flow rate of 3BV / h, SO 4 2- Resin-bound HCO 3 - An exchange reaction occurs, and the sodium bicarbonate effluent at the bottom of the column is collected, so t...

Embodiment 2

[0031] Embodiment 2: scale-up experiment

[0032] 1) Fill the strong alkali gel styrene resin LXI-201 in the exchange column by wet method, first wash the resin with deionized water at a flow rate of 8BV / h until the pH of the effluent is 7-9, and then use 5BV The ammonium bicarbonate solution with a molar concentration of 1.2mol / L rinses the resin at a flow rate of 1.5BV / h, and then washes the resin with deionized water at a flow rate of 8BV / h until the pH of the effluent is 7-9 to obtain HCO 3 - type anion exchange resin.

[0033] 2) Fill each of the two exchange columns with wet resin (i.e. HCO 3 - type anion exchange resin), and then two exchange columns are connected in series, and the mixed solution of sodium bicarbonate desulfurization product sodium sulfate and sodium bicarbonate is passed through the resin bed at a flow rate of 2BV / h, when the SO in the second exchange column effluent liquid 4 2- When it occurs, stop the collection, regenerate the resins in the tw...

Embodiment 3

[0035] 1) Fill the strong alkali gel styrene resin LXI-201 in the exchange column by wet method, first wash the resin with deionized water at a flow rate of 6BV / h until the pH of the effluent is 7-9, and then use a volume of 3BV, ammonium bicarbonate solution with a molar concentration of 2mol / L rinses the resin at a flow rate of 2BV / h, and then washes the resin with deionized water at a flow rate of 6BV / h until the pH of the effluent is 7-9 to obtain HCO 3 - type anion exchange resin.

[0036] 2) HCO 3 - Type anion exchange resin is filled in the anion exchange column by wet method. At room temperature, the mixed solution of sodium bicarbonate desulfurization product sodium sulfate and sodium bicarbonate with a pH value of 7 passes through the resin bed at a flow rate of 8BV / h, SO 4 2- Resin-bound HCO 3 - The exchange reaction occurs, and the effluent at the bottom of the column is collected, so that the SO in the effluent 4 2- Occurrence is the end point, and the vol...

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PUM

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Abstract

The invention relates to a regeneration cycling method of a flue gas desulfurizing agent, which comprises the following steps: filling an exchange column with HCO3<-> type anion exchange resin by a wet method, passing a sodium bicarbonate desulfurization product, namely a sodium sulfate and sodium bicarbonate mixed solution through a resin bed layer, and collecting a sodium bicarbonate effluent at the column bottom; crystallizing the effluent to obtain sodium bicarbonate, thereby finishing regeneration of a sodium bicarbonate desulfurizing agent; and leaching the ion exchange resin out of work, which is contained in the exchange column, with deionized water, ammonium bicarbonate or carbonic acid solution for regeneration, and washing the resin with deionized water to obtain HCO3<-> type resin. According to the method, the anion exchange resin is introduced to finish the regeneration of the sodium bicarbonate desulfurizing agent, the loaded resin can be recycled after regeneration, the resin regeneration effluent has commercial value, no waste residue or waste liquid is discharged, the green economic property and utilization rate of the process are improved, and a reasonable way is provided for recycling.

Description

technical field [0001] The invention belongs to the technical field of industrial waste water utilization, and in particular relates to a regeneration cycle method of a flue gas desulfurizer. Background technique [0002] At present, my country's air pollution is becoming more and more serious. As the world's largest coal producer and consumer, the total amount of sulfur dioxide emissions ranks first in the world. Under this background, flue gas desulfurization technology has developed rapidly in recent years, but a large number of desulfurization By-products also follow. For the traditional limestone-gypsum method, my country produced 52.3 million tons of desulfurized gypsum in 2010 alone. The comprehensive utilization of desulfurized gypsum is poor. At this stage, it is mainly discarded and stacked, which wastes land resources. And produce environmental pollution. Therefore, the innovation and optimization of the desulfurization and denitrification process is an urgent task...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/96B01D53/50
CPCB01D53/501B01D53/96B01D2251/304B01D2257/302
Inventor 杨岚马晓迅陈斌张香
Owner NORTHWEST UNIV(CN)