Solid material treatment process after electrolysis flue gas desulfurization

Abstract

The invention discloses a solid material treatment process after electrolytic flue gas desulfurization, electrolyte flue gas enters a desulfurization tower from the bottom of the desulfurization tower and then reacts with a desulfurizing agent, a series of chemical reactions are carried out under the action of high-pressure water mist, products comprise Ca (OH) 2, CaSO3, CaSO4 and CaCO3, the products are mixed in the flue gas to form blocks and powder, a gas-solid mixture is discharged from the upper part of the desulfurization tower, and the gas-solid mixture is discharged from the lower part of the desulfurization tower. According to the electrolysis flue gas desulfurization post-treatment process, the bag filter can be prevented from being impacted and damaged in the desulfurization process, meanwhile, the filtered blocky mixture is subjected to fluidization separation, and the separation efficiency is improved. And useful substances are separated out for cyclic utilization, so that the cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment, and particularly to a solid material treatment process after electrolytic flue gas desulfurization. Background Art

[0002] Sulfides are contained in electrolytic flue gas, and a desulfurization tower is required to reduce the sulfide content in the flue gas to meet the emission standards.

[0003] The flue gas enters from the bottom of the desulfurization tower, enters the bag filter from the upper outlet for filtration, and then is discharged into the chimney. When calcium hydroxide, the desulfurizing agent, is input from the middle and lower parts of the desulfurization tower, high-pressure spraying is accompanied. The flue gas fully reacts with semi-dry calcium hydroxide to form large lumps and fall to the bottom of the desulfurization tower. A large amount of mixtures will be carried when the flue gas is discharged from the tower. These mixtures are in powder or lump form. The powder mixture can enter the desulfurizing agent bin through the bag filter for continuous recycling, while the lump mixture entering the bag filter will cause great impact on the filter bags, resulting in the situation of broken bags, causing the harmful substances in the discharged flue gas to exceed the standard and reducing the service life of the equipment. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a solid material treatment process after electrolytic flue gas desulfurization, which can avoid impact damage to the bag filter during the desulfurization process and can effectively solve the problems in the background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A solid material treatment process after electrolytic flue gas desulfurization, in which the electrolyte flue gas enters the desulfurization tower from the bottom of the desulfurization tower and reacts with the desulfurizing agent, and a series of chemical reactions occur under the action of high-pressure water mist. The reaction products include Ca(OH)2, CaSO3, CaSO4 and CaCO3. The reaction products are mixed in the flue gas in the form of lumps and powders. The gas-solid mixture is discharged from the upper part of the desulfurization tower, filtered by a filter screen, the powder mixture enters the bag filter for filtration, and then is discharged from the chimney. The lump mixture enters a crusher to be crushed into qualified particles, and then the useful substances and impurities are separated by a fluidized beneficiation method. The impurities are directly discharged, and the useful substances are recycled.

[0006] As a preferred technical solution of the present invention, an induced draft fan is provided between the bag filter and the chimney.

[0007] As a preferred technical solution of the present invention, the output end of the crusher is connected with a screening device. The screening device screens out the qualified particles for fluidized separation, and the unqualified particles are sent back to the crusher for continuous crushing until the particle size is qualified.

[0008] As a preferred technical solution of the present invention, the particle size of the qualified particles is in the range of 0.3 - 1 mm.

[0009] As a preferred technical solution of the present invention, the useful substances selected by the fluidization method include calcium hydroxide, calcium sulfite, calcium sulfate and calcium carbonate, among which calcium hydroxide enters the desulfurization tower for recycling, calcium carbonate is stored separately, and calcium sulfite and calcium sulfate enter the desulfurization ash bin.

[0010] As a preferred technical solution of the present invention, the fluidized separation method is gas-solid fluidized separation.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the solid material treatment process after electrolytic flue gas desulfurization avoids damage to the bag filter by filtering out the block mixture, thereby improving the service life of the equipment; at the same time, the filtered block mixture is crushed and fluidized for sorting, and the calcium hydroxide is separated and re-entered into the desulfurization system for recycling, thereby saving costs and reducing the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0014] See also Figure 1 The present invention provides a technical solution: a solid material treatment process after electrolytic flue gas desulfurization, wherein the electrolyte flue gas enters the desulfurization tower from the bottom of the desulfurization tower and reacts with the desulfurizer, and undergoes a series of chemical reactions under the action of high-pressure water mist, and the products include Ca(OH)2, CaSO3, CaSO4 and CaCO3, and the products are mixed in the flue gas in the form of blocks and powders. The gas-solid mixture is discharged from the upper part of the desulfurization tower, filtered through a filter screen, and the powdery mixture enters a bag filter for filtration, and then discharged from the chimney. The block mixture enters a crusher and is crushed into qualified particles, and then calcium hydroxide, calcium sulfite, calcium sulfate and calcium carbonate are separated by fluidized separation to obtain useful substances that can be reused. Calcium carbonate is stored separately, calcium sulfite and calcium sulfate enter the desulfurization ash bin, and other impurities are directly discharged. Calcium hydroxide can enter the desulfurization tower for recycling, ensuring that the calcium hydroxide content in the desulfurization tower is continuously maintained at more than 80%, greatly improving the desulfurization efficiency.

[0015] In order to speed up the flow of flue gas and improve the desulfurization efficiency, an induced draft fan is installed between the filter bag and the chimney.

[0016] To ensure the smooth progress of fluidized beneficiation, a screening device is connected to the output end of the crusher. The screening device screens out qualified particles for fluidized separation, and the unqualified particles are sent back to the crusher for further crushing until the particle size is qualified. The particle size of the qualified particles ranges from 0.3 to 1 mm.

[0017] To avoid sewage discharge, the fluidized separation method is gas-solid fluidized separation.

[0018] The present invention can effectively prevent the blocky mixture carried in the flue gas from impacting and damaging the bag filter when entering it, and extend the service life of the equipment. At the same time, the blocky mixture filtered out is subjected to fluidized beneficiation, and useful substances such as calcium hydroxide are separated and recycled, which can effectively save costs and reduce the labor intensity of workers.

[0019] The parts not detailed in the invention are prior art. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrolytic flue gas desulfurization solid material treatment process, characterized in that: After the electrolyte flue gas enters the desulfurization tower from the bottom of the desulfurization tower, it reacts with the desulfurizer and undergoes a series of chemical reactions under the action of high-pressure water mist. The reaction products include Ca(OH)2, CaSO3, CaSO4, and CaCO3. The reaction products are mixed in the flue gas in the form of lumps and powders. The gas-solid mixture is discharged from the upper part of the desulfurization tower. After being filtered by a filter screen, the powdery mixture enters a bag filter for filtration and then is discharged from the chimney. The lumpy mixture enters a crusher to be crushed into qualified particles, and then the useful substances and impurities are separated by a fluidized beneficiation method. The impurities are directly discharged, and the useful substances are recycled, and the impurities are directly discharged.

2. The solid material treatment process after electrolytic flue gas desulfurization according to claim 1, wherein: An induced draft fan is arranged between the bag filter and the chimney.

3. The solid material treatment process after electrolytic flue gas desulfurization according to claim 1, characterized in that: The output end of the crusher is connected with a screening device. The screening device screens out the qualified particles for fluidized separation, and the unqualified particles are sent back to the crusher for continuous crushing until the particle size is qualified.

4. A solid material treatment process after electrolytic flue gas desulfurization according to claim 1 or 3, characterized in that: The particle size of the qualified particles is in the range of 0.3 - 1 mm.

5. A solid material treatment process after electrolytic flue gas desulfurization according to claim 1, characterized in that: The useful substances selected by the fluidized beneficiation method include calcium hydroxide, calcium sulfite, calcium sulfate, and calcium carbonate. Among them, calcium hydroxide enters the desulfurization tower for recycling, calcium carbonate is stored separately, and calcium sulfite and calcium sulfate enter the desulfurization ash bin.

6. A solid material treatment process after electrolytic flue gas desulfurization according to claim 1, characterized in that: The fluidized separation method is gas-solid fluidized separation.

Images