CN218741203U - Flue gas desulfurization dust pelletizing system - Google Patents
Flue gas desulfurization dust pelletizing system Download PDFInfo
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- CN218741203U CN218741203U CN202223158692.1U CN202223158692U CN218741203U CN 218741203 U CN218741203 U CN 218741203U CN 202223158692 U CN202223158692 U CN 202223158692U CN 218741203 U CN218741203 U CN 218741203U
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Abstract
The utility model provides a flue gas desulfurization and dust removal system, which comprises a dust removal and desulfurization tower, a feeding mechanism and a feeding mechanism; the feeding mechanism is used for conveying the catalyst into the dedusting and desulfurizing tower and comprises a feeding conveyor, a feeding buffer hopper and a tower top material distribution bin which are sequentially communicated, an outlet of the tower top material distribution bin is communicated with an inlet of the catalyst at the top of the dedusting and desulfurizing tower, and a tower top feeding valve is arranged between the feeding buffer hopper and the tower top material distribution bin; the catalyst is a calcium-based desulfurizer; the bottom in the dedusting and desulfurizing tower is provided with a roller type discharger, and the feeding mechanism is communicated with a byproduct outlet at the bottom of the dedusting and desulfurizing tower and is used for conveying byproducts discharged by the dedusting and desulfurizing tower; the upper stream of the dedusting and desulfurizing tower is communicated with a booster fan, and the rear end of the dedusting and desulfurizing tower is communicated with a chimney. The utility model discloses process flow is simple, energy saving and emission reduction, and the pollutant desorption is efficient, can avoid accessory substance secondary environmental pollution.
Description
Technical Field
The utility model belongs to the technical field of flue gas purification, concretely relates to remove bed flue gas desulfurization dust pelletizing system based on calcium base desulfurizer.
Background
In recent years, the emission standard of atmospheric pollution is gradually improved, and SO is taken as a main atmospheric pollutant 2 The allowable emission concentration of (2) is gradually reduced, taking a blast furnace hot blast stove as an example: the fuel of the blast furnace hot blast stove is blast furnace gas or coke oven gas, and SO is generated in the combustion heating process 2 、NO x And pollutants such as dust and the like cause non-negligible pollution to the atmospheric environment. The 'emission standard of air pollutants for ironmaking industry' (GB 28663-2012) executed in the field of flue gas emission in the blast furnace ironmaking field of the steel mill at present brings the emission of the pollution of the waste gas of the hot blast stove into strict control, and the main assessment index limit values are as follows: particulate matter 15mg/Nm 3 80mg/Nm of sulfur dioxide 3 Nitrogen oxides (with NO) 2 Meter) 300mg/Nm 3 . In recent years, the national and all parts of the flue gas emission standard become stricter, and with the increase of the prevention and control force of atmospheric environmental pollution in China, the requirements for a flue gas purification system in the blast furnace ironmaking field are higher, and the ultralow emission modification of a blast furnace smelting flue gas system is required to reduce the pollution to the environment.
The existing blast furnace smelting flue gas desulfurization systems are as follows: 1. the system utilizes an SDS dry deacidification spraying technology to adjust the injection amount of a desulfurizer at any time according to the content of acidic substances in the flue gas so as to achieve a flue gas emission index; however, the price of the desulfurizer of the SDS process is high, and the byproduct is sodium salt, so that the disposal is difficult; 2. the blast furnace gas firstly reduces sulfides before entering the hot blast furnace for combustion, and then ensures that the flue gas reaches the ultralow emission standard by a staged combustion method after entering the hot blast furnace; however, the system flow is complex, the construction investment cost is high, the water consumption of the hydrolysis tower is large, and the problems of serious corrosion, high operation and maintenance cost and easy secondary pollution are caused; 3. the system is simple in structure, can remove sulfur dioxide and nitrogen oxides in flue gas, but has the problems of high water consumption, serious corrosion, high operation and maintenance cost and easiness in causing secondary pollution; 4. the desulfurization and denitrification device comprises oxidizing gas supply equipment, calcium-based absorbent supply equipment, a fixed bed reactor and pre-dedusting equipment, has good desulfurization and denitrification effects, but needs to spray process water into the fixed bed reactor, has large water consumption of the process water, and can not meet the requirement of continuous operation working conditions because the fixed bed reactor is not continuous but periodic in operation; 5. including hot-blast furnace, liquid dust remover, draught fan, system design is simple, and is rational in infrastructure, can be to the effectual processing of hot-blast furnace high temperature flue gas, but the water consumption of liquid dust remover is great, and has the serious, operation maintenance cost is high, easily causes secondary pollution's problem of corroding.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that current blast furnace smelting flue gas desulfurization system exists, the utility model provides a flue gas desulfurization dust pelletizing system, process flow is simple, energy saving and emission reduction, and the pollutant desorption is efficient, can avoid accessory substance secondary environmental pollution.
The utility model discloses a solve the technical scheme that its technical problem adopted and be: a flue gas desulfurization and dust removal system comprises a dust removal and desulfurization tower, a feeding mechanism and a feeding mechanism; the feeding mechanism is used for conveying the catalyst into the dedusting and desulfurizing tower and comprises a feeding conveyor, a feeding buffer hopper and a tower top material distribution bin which are sequentially communicated, an outlet of the tower top material distribution bin is communicated with an inlet of the catalyst at the top of the dedusting and desulfurizing tower, and a tower top feeding valve is arranged between the feeding buffer hopper and the tower top material distribution bin; the catalyst is a calcium-based desulfurizer; the bottom in the dedusting and desulfurizing tower is provided with a roller type discharger, and the feeding mechanism is communicated with a byproduct outlet at the bottom of the dedusting and desulfurizing tower and is used for conveying byproducts discharged by the dedusting and desulfurizing tower; the upper stream of the dedusting and desulfurizing tower is communicated with a booster fan, and the rear end of the dedusting and desulfurizing tower is communicated with a chimney.
As a further embodiment of the present invention, the feeding mechanism comprises a tower bottom collection bin, a byproduct conveyor, and a byproduct material bin which are sequentially connected; the tower bottom gathering bin is communicated with a byproduct outlet at the bottom of the dedusting and desulfurization tower, a tower bottom discharge valve is arranged between the tower bottom gathering bin and the byproduct conveyor, and a byproduct bin discharge valve is arranged at the bottom of the byproduct bin.
As a further embodiment of the utility model, the dedusting and desulfurizing tower adopts a cross flow moving bed, and the flow direction of the flue gas is vertical to the movement direction of the calcium-based desulfurizing agent.
As a further embodiment of the utility model, the main components of the calcium-based desulfurizer are slaked lime and adhesive.
As a further embodiment of the present invention, the feeding conveyor is one or more of an electric block, a bucket conveyor, a bucket elevator, and a belt conveyor.
As a further embodiment of the present invention, the byproduct conveyor is one or more of an electric hoist, a bucket conveyor, a bucket elevator, and a belt conveyor.
The beneficial effects of the utility model include: the moving bed flue gas desulfurization and dust removal system based on the calcium-based desulfurizer has the characteristics of simple flow, compact structure and small occupied area, and also has the following advantages:
1) The arrangement of the booster fan can improve the pressure of the original flue gas, the feeding buffer hopper can buffer the entering calcium-based desulfurizer, the feeding valve at the top of the tower controls the feeding speed of the calcium-based desulfurizer, and the material distribution bins at the top of the tower can uniformly distribute and feed the dust removal desulfurization tower; the feeding mechanism is arranged to collect the byproducts after the reaction, control the outflow speed of the byproducts and convey the byproducts for recycling.
2) The utility model can operate stably and uninterruptedly all the year round, and can meet the requirements of alternative combustion and non-extinguishing of each hot blast stove in the service cycle after the blast furnace hot blast stove is put into operation.
3) The utility model has good adaptability to the flue gas load, does not need to set measures such as flue gas backflow and the like, and can meet the operation requirement within the load range of 0-100 percent.
4) The utility model discloses well desulfurization is absorbed and the accessory substance is handled all is gone on under the dry logistics state, has no sewage waste acid discharge, the advantage of no corruption to the flue gas does not have obvious cooling, purification back smoke temperature height, does not have "white cigarette" phenomenon in the purification process, is favorable to the chimney exhaust diffusion.
5) The utility model discloses the characteristics that calcium base desulfurizer of using has high-usage, high strength, high sulfur capacity, temperature adaptability wide (80 ~ 350 ℃) etc. are applicable to that hot-blast furnace flue gas temperature is undulant big, especially hot-blast furnace flue gas temperature is up to 350 degrees when the pre-heater trouble requires.
6) The utility model discloses a byproduct is mainly the mixture of anhydrous gypsum, calcium carbonate, slaked lime, becomes the graininess, can regard as cement raw meal or building materials raw materials to use, also can be used to improve soil, foundation ditch backfill, handle waste water, neutralization sludge etc. and no secondary pollution problem to the recycle of resource has been realized.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure, 1-booster fan, 2-dedusting and desulfurizing tower, 3-chimney, 4-feeding conveyor, 5-feeding buffer hopper, 6-tower top feeding valve, 7-tower top distributing bin, 8-roller discharger, 9-tower bottom collecting bin, 10-tower bottom discharging valve, 11-byproduct conveyor, 12-byproduct material bin and 13-byproduct bin discharging valve.
Detailed Description
The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "vertical", "horizontal", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or component referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
A moving bed flue gas desulfurization and dust removal system based on a calcium-based desulfurizer is shown in figure 1 and comprises a dust removal desulfurization tower 2 adopting a cross flow moving bed, wherein a booster fan 1 is arranged at the upstream of the dust removal desulfurization tower 2 and used for improving the pressure of original flue gas, and a chimney 3 used for discharging clean flue gas is arranged at the downstream of the dust removal desulfurization tower 2; the feeding conveyor 4, the feeding buffer hopper 5, the tower top feeding valve 6 and the tower top distributing bin 7 are sequentially arranged at a calcium-based desulfurizer inlet at the top of the dedusting and desulfurizing tower 2 in sequence, the feeding conveyor 4 is used for conveying the calcium-based desulfurizer, the feeding buffer hopper 5 is used for buffering the calcium-based desulfurizer, the tower top feeding valve 6 is used for controlling the feeding speed of the calcium-based desulfurizer, and the tower top distributing bin 7 is used for uniformly distributing and feeding the calcium-based desulfurizer to the dedusting and desulfurizing tower 2.
The bottom of the dedusting and desulfurizing tower 2 is provided with a roller type discharger 8 for controlling the downward moving speed of the calcium-based desulfurizing agent.
A byproduct collecting bin 9 at the bottom of the dedusting and desulfurizing tower 2, a discharge valve 10 at the bottom of the tower, a byproduct conveyor 11, a byproduct bin 12 and a discharge valve 13 of the byproduct bin are sequentially arranged at a byproduct outlet at the bottom of the dedusting and desulfurizing tower; the tower bottom collecting bin 9 is used for collecting byproducts after reaction, the tower bottom discharge valve 10 is used for controlling the outflow speed of the byproducts, the byproduct conveyor 11 is used for conveying the byproducts, the byproduct bin 12 is used for temporarily storing the byproducts, and the byproduct material bin discharge valve 13 is used for discharging the byproducts.
In the above embodiment, the feeding conveyor 4, the byproduct conveyor 11 may be an electric hoist, a bucket conveyor, a bucket elevator, a belt conveyor, or a combination thereof.
When the system works and uses, the calcium-based desulfurizer is conveyed to the feeding buffer hopper 5 through the feeding conveyor 4, and is conveyed to the dedusting and desulfurizing tower 2 through the tower top feeding valve 6 and the tower top distributing bin 7 in sequence. The raw flue gas enters from the middle air chamber of the dedusting and desulfurizing tower 2 after being pressurized by the booster fan 1 and transversely passes through the calcium-based desulfurizing agent bed layer from inside to outside, and the raw flue gas isSO of (A) 2 And the pollutants react with the calcium-based desulfurizer to be purified, and the purified clean flue gas is discharged from an air chamber at the outer side of the dedusting and desulfurizing tower 2 and enters a chimney 3 to be discharged. The desulfurization byproducts after reaction are collected by a tower bottom collecting bin 9 and then discharged by a tower bottom discharging valve 10, are conveyed to a byproduct bin 12 by a byproduct conveyor 11, and are discharged by a byproduct bin discharging valve 13 to realize comprehensive utilization.
The dedusting and desulfurizing tower 2 adopts a cross flow moving bed, and dust and SO in the raw flue gas are in contact with a calcium-based desulfurizing agent in the process 2 The main chemical reaction equation generated inside the dedusting and desulfurizing tower 2 is as follows:
Ca(OH) 2 +SO 2 →CaSO 3 ·1/2H 2 O+1/2H 2 O
Ca(OH) 2 +SO 3 →CaSO 4 ·1/2H 2 O+1/2H 2 O
CaSO 3 ·1/2H 2 O+1/2O 2 →CaSO 4 ·1/2H 2 O
2Ca(OH) 2 +2HCl→CaCl 2 ·Ca(OH) 2 ·2H 2 O
Ca(OH) 2 +2HF→CaF 2 +2H 2 O
Ca(OH) 2 +CO 2 →CaCO 3 +H 2 O
the calcium-based desulfurizing agent mainly comprises slaked lime, adhesive, etc., and has Ca (OH) 2 High utilization rate, high strength, high sulfur capacity, wide temperature adaptability (80-350 deg.C) and the like. Within the temperature range of 80-400 ℃, the calcium-based desulfurizer can well absorb SO 2 . Having NO in the raw flue gas x 、O 2 、H 2 In the presence of O, calcium-based desulfurizing agent can be used for treating SO 2 The absorption is significantly accelerated.
The reaction by-products are mainly the mixture of anhydrous gypsum, calcium carbonate and slaked lime, are granular, can be used as raw materials of cement or building materials, and can also be used for improving soil, backfilling foundation pits, treating waste water, neutralizing sludge and the like, thereby realizing the reutilization of resources.
Example 2
Unlike embodiment 1, the booster fan 1 may also be located downstream of the dust-removal desulfurization tower 2. The chimney 3 can be newly built or can return clean flue gas to the original flue.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (6)
1. A flue gas desulfurization and dust removal system is characterized by comprising a dust removal and desulfurization tower (2), a feeding mechanism and a feeding mechanism; the feeding mechanism is used for conveying the catalyst into the dedusting and desulfurizing tower (2) and comprises a feeding conveyor (4), a feeding buffer hopper (5) and a tower top distributing bin (7) which are sequentially communicated, an outlet of the tower top distributing bin (7) is communicated with a catalyst inlet at the top of the dedusting and desulfurizing tower (2), and a tower top feeding valve (6) is arranged between the feeding buffer hopper (5) and the tower top distributing bin (7); the catalyst is a calcium-based desulfurizer; a roller type discharger (8) is arranged at the bottom in the dedusting and desulfurizing tower (2), and the feeding mechanism is communicated with a byproduct outlet at the bottom of the dedusting and desulfurizing tower (2) and is used for conveying byproducts discharged by the dedusting and desulfurizing tower (2); the upper stream of the dedusting and desulfurizing tower (2) is communicated with the booster fan (1), and the rear end of the dedusting and desulfurizing tower is communicated with the chimney (3).
2. The system for desulfurizing and dedusting flue gas according to claim 1, wherein the feeding mechanism comprises a tower bottom collecting bin (9), a byproduct conveyor (11) and a byproduct bin (12) which are communicated in sequence; the tower bottom material collecting bin (9) is communicated with a byproduct outlet at the bottom of the dedusting and desulfurizing tower (2), a tower bottom discharge valve (10) is arranged between the tower bottom material collecting bin (9) and the byproduct conveyor (11), and a byproduct material bin discharge valve (13) is arranged at the bottom of the byproduct material bin (12).
3. The system for desulfurizing and dedusting flue gas as recited in claim 1, wherein the dedusting and desulfurizing tower (2) adopts a cross-flow moving bed, and the flow direction of the flue gas is perpendicular to the movement direction of the calcium-based desulfurizing agent.
4. The system of claim 3, wherein the calcium-based desulfurizing agent comprises slaked lime and a binder.
5. The flue gas desulfurization dust removal system according to claim 1, wherein the feeding conveyor (4) is one or more of an electric hoist, a bucket conveyor, a bucket elevator, and a belt conveyor.
6. The flue gas desulfurization dust removal system of claim 2, wherein the byproduct conveyor (11) is one or more of an electric hoist, a bucket conveyor, a bucket elevator, and a belt conveyor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223158692.1U CN218741203U (en) | 2022-11-28 | 2022-11-28 | Flue gas desulfurization dust pelletizing system |
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| CN202223158692.1U CN218741203U (en) | 2022-11-28 | 2022-11-28 | Flue gas desulfurization dust pelletizing system |
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