CN214635285U

CN214635285U - Desulphurization unit with regeneration retort is handled high oxygen content flue gas

Info

Publication number: CN214635285U
Application number: CN202120766814.1U
Authority: CN
Inventors: 陈远新
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-15
Filing date: 2021-04-15
Publication date: 2021-11-09
Anticipated expiration: 2031-04-15

Abstract

The utility model provides a desulphurization unit with regeneration retort handles high oxygen content flue gas, the utility model discloses mainly used brick and tile, ceramic industry's tunnel cave, annular kiln, the dual alkali method desulfurization technology of the high flue gas of oxygen content such as coal-fired industrial kiln. The utility model has the advantages that: the utility model discloses an increase flocculating agent catalyst in independent regeneration retort allies oneself with jar, make lime and doctor solution fully take place regeneration reaction, keep apart, solidify with higher speed with the oxidation tank, overcome present two alkaline process lime regeneration incomplete, the desulfurization gypsum crystallization is slow, the sedimentation tank is big, the pipe blockage, the desulfurization inefficiency not enough.

Description

Desulphurization unit with regeneration retort is handled high oxygen content flue gas

Technical Field

The utility model relates to the technical field of environmental protection, in particular to a double-alkali desulfurization process suitable for high-oxygen-content flue gas.

Background

It is known that in the flue gas desulfurization sodium calcium double alkali method process, sodium alkali (NaOH, NaHCO)₃) SO in liquid and flue gas₂Reaction to produce sodium sulfate (Na)₂SO₃、NaHSO_3、Na₂SO₄) And calcium alkali (Ca (OH)₂) And reacting with sodium sulfate, regenerating to obtain sodium alkali and gypsum, and only consuming calcium alkali to complete the flue gas desulfurization cycle.

The purpose of the regeneration reaction is to require the sodium sulfate salt (Na) produced by the desulfurization reaction₂SO₃、NaHSO_3、Na₂SO₄) Sodium hydroxide regenerated with calcium hydroxide is sent back to the absorption system for continuous use, and calcium sulfite hemihydrate generated by the reaction can be oxidized to generate gypsum. However, sodium sulfate in sodium sulfate salt reacts with calcium hydroxide very little, and is dissolved in water and cannot be separated, so one of the important technical indexes of the dual-alkali desulfurization is to reduce the generation of sodium sulfate, and is an important technical measure for improving the desulfurization effect, and because flue gas in boilers and other industries requires a standard excess air coefficient of 1.7 (the oxygen content is 8.6%), the oxygen content in the flue gas is low, the produced sodium sulfate is less, and the influence is relatively small. However, the flue gas of kilns in the brick and tile industry, the ceramic industry and the like has 18 percent of reference oxygen content and higher actual oxygen content, and excessive oxygen, sodium sulfite and sodium bisulfate produce a large amount of sodium sulfate, so that the regeneration efficiency is low, and the problems of poor flue gas desulfurization effect, large lime and alkali liquor consumption, serious pipeline blockage and the like of the double alkali desulfurization process in the brick and tile industry and the ceramic industry cannot be normally operated. The actual phenomenon is that although a regeneration tank is provided, sodium sulfate which is difficult to react is oxidized before regeneration, the regeneration effect is poor, and when a certain concentration is reached, pipeline blockage, large alkali liquor consumption and poor desulfurization effect are caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the problem and not enough of above-mentioned existence, provide a high flue gas dual alkali method desulfurization process units of oxygen content such as mainly used brick and tile, ceramic industry's tunnel cave, coal-fired industrial furnace, overcome present dual alkali method lime regeneration incomplete, the desulfurization gypsum crystallization slow, the sedimentation tank is big, desulfurization inefficiency not enough.

In order to achieve the purpose, the adopted technical scheme is as follows:

a desulfurizing device with a regeneration reaction tank for treating high-oxygen content flue gas comprises a desulfurizing tower, a desulfurizing liquid spray nozzle set, a stirring regeneration reaction tank, a flocculating agent, a catalyst and a catalyst, wherein the flue gas enters the desulfurizing tower to carry out chemical reaction with the desulfurizing liquid spray nozzle set, the flue gas is discharged from the upper part of the desulfurizing tower, the reacted desulfurizing liquid enters the regeneration reaction tank through a desulfurizing tower water return pipe to carry out chemical reaction with the flocculating agent, the flocculating agent and the catalyst conveyed by the catalyst combination tank, meanwhile, the lime bin is characterized in that lime enters a lime slurry preparation tank after lime is metered by a lime powder screw feeder to prepare lime slurry, the lime slurry also enters a regeneration reaction tank with stirring, mixed liquid which jointly generates chemical reaction enters an oxidation tank with stirring through a regeneration reaction tank and an oxidation tank communicating pipe, after further oxidation with the air delivered by the oxidation air pump component, the air enters the sedimentation tank through the oxidation tank and the sedimentation tank communicating pipe for sedimentation, and the reaction product gypsum and the like after sedimentation is discharged from the gypsum liquid discharge pipe at regular time by the gypsum liquid discharge valve. The supernatant after precipitation enters a circulation tank through a sedimentation tank and a circulation tank communicating pipe to be mixed with alkali liquor flowing in an alkali tank and surfactant flowing in a surfactant tank to form desulfurization liquid, and the desulfurization liquid enters a desulfurization liquid spray nozzle group through a desulfurization liquid circulation pump and a pipeline to be circulated, so that the desulfurization process is completed.

Drawings

The components in the figure are as follows: a desulfurization liquid spray nozzle group (1), a desulfurization tower (2), a flocculant tank (3), a desulfurization tower return pipe (4), a catalyst tank (5), a flocculant feed inlet (6), a catalyst feed inlet (7), a lime slurry feed inlet (8), a regeneration reaction tank (9) with stirring, a lime pulping tank (10), an oxidation pond communicating pipe (11), an oxidation pond (12) with stirring, a sedimentation pond communicating pipe (13), a sedimentation pond (14), a gypsum liquid discharge pipe (15), a gypsum liquid discharge valve (16), a circulating pond communicating pipe (17), a circulating pond (18), a desulfurization liquid circulating pump and a pipeline (19), an alkali tank (20), a surfactant tank (21), an oxidation air pump component (22), a lime powder screw feeder (23) and a lime storage bin (24)

The open arrows in the figure indicate the flow of flue gas, and the solid arrows indicate the flow of desulfurization solution.

FIG. 1: a schematic diagram of a desulfurization device system with a regeneration reaction tank for treating high-oxygen-content flue gas.

FIG. 2: desulphurization device structure schematic diagram with regeneration reaction tank for treating high-oxygen-content flue gas

FIG. 3: A-A section view, (the regeneration reaction tank and the oxidation tank communicating pipe (11) is a view rotating by 90 degrees)

Detailed Description

The following detailed description of a desulfurization device with a regeneration reaction tank for treating flue gas with high oxygen content is provided with reference to the accompanying drawing 1:

flue gas enters a desulfurizing tower (2) and desulfurizing liquid conveyed by a desulfurizing liquid circulating pump and a pipeline (19) is discharged from the upper part of the desulfurizing tower after undergoing a desulfurizing chemical reaction when being sprayed by a desulfurizing liquid spraying nozzle group (1), the desulfurizing liquid after the reaction enters a regeneration reaction tank (9) with stirring through a desulfurizing tower water return pipe (4) and is subjected to a chemical reaction with a flocculating agent, a flocculating agent and a catalyst conveyed by a catalyst connecting tank (4), meanwhile, a lime storage bin (24) is formed by metering lime by a lime powder screw feeder (23) and then entering a lime slurry preparation pool (10) to prepare lime slurry, and the lime slurry also enters the regeneration reaction tank (9) with stirring, because of the independent regeneration reaction tank (9) with stirring, little outside air enters, the oxidation reaction is weak, and the main reaction is that calcium hydroxide in the lime slurry with catalyst and sodium hydrogen phosphate sulfate in a desulfurizing mixed solution, Sodium sulfite reacts, mixed liquor enters an oxidation tank (12) with stirring through a regeneration reaction tank and an oxidation tank communicating pipe (11), air conveyed by an oxidation air pump assembly (22) is further oxidized with calcium hydrogen phosphate and calcium sulfite to produce gypsum, the gypsum and the mixed liquor enter a sedimentation tank (14) through an oxidation tank and sedimentation tank communicating pipe (13) to be sedimentated, and the sedimentated gypsum and the like are controlled by a gypsum liquid discharge valve (16) to be discharged from a gypsum liquid discharge pipe (15) at regular time. The supernatant after precipitation mainly comprises sodium hydroxide, sodium bicarbonate and sodium carbonate solution which enters a circulation tank (18) through a sedimentation tank and a circulation tank communicating pipe (17), alkali liquor flowing in an alkali tank (20) and surfactant flowing in a surfactant tank (21) are mixed into desulfurization solution, and the desulfurization solution enters a desulfurization solution spray nozzle group (1) through a desulfurization solution circulating pump and a pipeline (19) to be circulated, so that the desulfurization circulation process is completed.

The utility model has the advantages that: the utility model discloses an structurally increase regeneration retort, increase flocculating agent, catalyst, make lime liquor and doctor solution fully take place regeneration reaction, weaken oxidation reaction in independent regeneration retort, improve utilization and desulfurization efficiency, the lower desulfurization cost of lime. Solves the problems of low desulfurization efficiency, large sedimentation tank, large consumption and pipeline blockage caused by the oxidation of sodium salt in desulfurization liquid by flue gas with high oxygen content such as tunnel kiln, annular kiln, coal-fired industrial kiln in brick and tile industry, ceramic industry and the like, and has low operation cost.

The above detailed description is made on the desulfurization device with regeneration reaction tank for processing high oxygen content flue gas provided by the embodiment of the present invention, and the specific examples are applied herein to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. The utility model provides a desulphurization unit with regeneration retort is handled high oxygen content flue gas which characterized in that: the device comprises a desulfurization liquid spray nozzle group (1), a desulfurization tower (2), a flocculant tank (3), a desulfurization tower water return pipe (4), a catalyst tank (5), a flocculant feed port (6), a catalyst feed port (7), a lime slurry feed port (8), a regeneration reaction tank (9) with stirring, a lime pulping tank (10), an oxidation tank communicating pipe (11), an oxidation tank (12) with stirring, a sedimentation tank communicating pipe (13), a sedimentation tank (14), a gypsum liquid discharge pipe (15), a gypsum liquid discharge valve (16), a circulating tank communicating pipe (17), a circulating tank (18), a desulfurization liquid circulating pump and pipeline (19), an alkali tank (20), a surfactant tank (21), an oxidizing air pump assembly (22), a lime powder screw feeder (23) and a lime storage bin (24); the desulfurization liquid spray nozzle group (1) is arranged inside the desulfurization tower (2), the desulfurization tower (2) is connected with a desulfurization tower return pipe (4), the desulfurization tower return pipe (4) is connected with a regeneration reaction tank (9) with stirring, a flocculating agent feed inlet (6), a catalyst feed inlet (7) and a lime slurry feed inlet (8) are sequentially connected above the regeneration reaction tank (9) with stirring, the other end of the flocculating agent feed inlet (6) is connected with a flocculating agent tank (3), the other end of the catalyst feed inlet (7) is connected with a catalyst tank (5), the other end of the lime slurry feed inlet (8) is connected with a lime slurry making tank (10), the right side of the regeneration reaction tank (9) with stirring is connected with an oxidation tank communicating pipe (11), the other end of the oxidation tank communicating pipe (11) is provided with an oxidation tank (12) with stirring, oxidation pond (12) of area stirring have been placed oxidation air pump subassembly (22), sedimentation tank closed tube (13) set up in oxidation pond (12) of area stirring are right-hand, sedimentation tank closed tube (13) other end is provided with sedimentation tank (14), gypsum liquid discharge pipe (15) connect in sedimentation tank (14) below, gypsum liquid discharge pipe (15) are provided with gypsum liquid blow-off valve (16), sedimentation tank (14) with circulation pond (18) by circulation pond closed tube (17) UNICOM, circulation pond (18) top has set gradually alkali jar (20) with surfactant jar (21), doctor solution circulating pump and pipeline (19) set up in circulation pond (18) are right-hand.

2. The desulfurization device with regeneration reaction tank for processing flue gas with high oxygen content according to claim 1, characterized in that: the desulfurization solution flows in a single direction in the desulfurization tower return pipe (4), the regeneration reaction tank and the oxidation pond communicating pipe (11), and the regeneration reaction of the flocculating agent, the catalyst and the lime slurry is completed in an independent space of the regeneration reaction tank (9) with stirring.

3. The desulfurization device with regeneration reaction tank for processing flue gas with high oxygen content according to claim 1, characterized in that: the regeneration reaction tank (9) with stirring is capable of adding flocculant and catalyst in the regeneration reaction from the flocculant tank (3), the flocculant feeding port (6), the catalyst tank (5) and the catalyst feeding port (7).