CN219149733U

CN219149733U - Flue gas desulfurization, denitrification and dust removal system for gypsum board production line

Info

Publication number: CN219149733U
Application number: CN202223595173.1U
Authority: CN
Inventors: 谢富冬; 任有欢; 梁松茂
Original assignee: Beijing New Building Material Group Co Ltd; China National Building Materials Innovation and Technology Research Institute Co Ltd; China National Building Material Group Co Ltd CNBM
Current assignee: Beijing New Building Material Group Co Ltd; China National Building Materials Innovation and Technology Research Institute Co Ltd; China National Building Material Group Co Ltd CNBM
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-06-09
Anticipated expiration: 2032-12-29

Abstract

The utility model provides a flue gas desulfurization, denitrification and dust removal system for a gypsum board production line. The system comprises a heat exchange unit; a denitration unit; the system comprises a cloth bag dust removing unit and a limestone-gypsum wet desulfurization unit, wherein the limestone-gypsum wet desulfurization unit comprises spraying equipment, a tube bundle dust removing demister and a wet electric dust collector. The system provided by the utility model obviously reduces the content of pollutants in the tail gas discharged from the system, protects the environment, improves the desulfurization and dust removal efficiency, and reduces the production cost.

Description

Flue gas desulfurization, denitrification and dust removal system for gypsum board production line

Technical Field

The utility model relates to the field of gypsum board production, and in particular relates to a flue gas desulfurization, denitrification and dust removal system for a gypsum board production line.

Background

In the existing gypsum calcination process, a gas hot blast stove or a coal hot blast stove is generally adopted to provide high-temperature flue gas for a fluidized bed calciner. The high-temperature flue gas is formed by directly burning fuel and performing high-purification treatment, and then the high-temperature flue gas is directly contacted with gypsum raw material for calcination. In this way, a large amount of pollutant particles are usually generated, however, the existing pollutant emission treatment method has the defects of low efficiency, high cost, incomplete treatment and the like.

Accordingly, there is a need for an improved system for disposing of exhaust fumes for gypsum board production lines.

Disclosure of Invention

The following is a summary of the subject matter of the detailed description of the utility model. This summary is not intended to limit the scope of the utility model.

The utility model aims to provide a flue gas desulfurization, denitrification and dust removal system for a gypsum board production line.

The flue gas desulfurization, denitrification and dust removal system for the gypsum board production line comprises:

a heat exchange unit configured to exchange heat between a first flue gas generated by combustion of fuel and a cooling medium to reduce the temperature of the first flue gas to a denitration temperature to form a second flue gas;

a denitration unit configured to introduce the second flue gas and perform a denitration reaction to remove nitrogen oxides in the second flue gas to form a third flue gas;

a bag-type dust removing unit configured to remove dust particles in the cooled third flue gas to generate fourth flue gas and fifth flue gas, the fourth flue gas being returned to the heat exchange unit as a cooling medium;

and the desulfurization unit is configured to introduce the fifth flue gas and remove sulfur dioxide and residual particles in the fifth flue gas to form sixth flue gas, and the sixth flue gas is discharged out of the flue gas desulfurization, denitrification and dust removal system.

In the present utility model, the denitration temperature was 400 ℃.

Optionally, the denitration unit is a selective catalytic reduction denitration unit.

Optionally, the temperature of the fourth flue gas as the cooling medium is below 130 ℃.

Alternatively, the desulfurization unit is a limestone-gypsum wet desulfurization unit.

Optionally, the limestone-gypsum wet desulfurization unit includes a spray apparatus, a tube bundle dust and mist eliminator disposed above the spray apparatus, and a wet electric precipitator disposed above the tube bundle dust and mist eliminator.

The selective catalytic reduction denitration device mixes the low-temperature flue gas (recycled) generated by the bag-type dust collector in the system with the high-temperature flue gas provided by the heat source system, so that the temperature of the flue gas entering the denitration reactor is reduced, the adverse effect of the excessive temperature on the denitration catalyst is avoided, a proper temperature window is provided for denitration operation, the denitration efficiency is ensured, the high-temperature flue gas provided by the heat source is not required to be cooled by additionally introducing cold air, the heat generated by the system is fully utilized, the heat waste is avoided, the heat discharged by the whole system to the outside is reduced, the utilization efficiency of the system to the heat is improved, the cost is reduced, and the environmental protection performance of the whole gypsum production line is enhanced.

According to the utility model, three dust collectors are arranged, and the types and positions of the three dust collectors cannot be changed; in the wet desulfurization system, spray equipment for desulfurization and a dedusting demister are combined to form a desulfurization collaborative dedusting demisting integrated system, most of particulate matters can be removed while desulfurization is performed, and wet electric dust collector equipment is added, so that a complete set of desulfurization dedusting integrated equipment is formed, and the desulfurization dedusting target completely meets the emission requirement. The method not only remarkably reduces the content of pollutants in the tail gas discharged from the system and protects the environment, but also improves the efficiency of desulfurization and dust removal and reduces the production cost.

The system provided by the utility model forms a set of system with very high automation degree by integrating and combining various devices again and arranging the devices carefully, so that the emission of the smoke pollutants meets the extremely strict emission standard.

The system provided by the utility model is particularly suitable for treating the tail gas of a small coal-fired boiler, has high automation degree, relatively simple equipment and good tail gas treatment effect, and has excellent economic and social benefits.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. Other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The accompanying drawings are included to provide an understanding of the principles of the utility model, and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain, without limitation, the principles of the utility model.

Fig. 1 is a schematic diagram of a flue gas desulfurization, denitrification and dust removal system for a gypsum board production line according to an exemplary embodiment of the present utility model.

Reference numerals illustrate:

1-a heat exchange unit; 2-a selective catalytic reduction denitration unit; 3-a cloth bag dust removing unit; 4-spraying equipment; 5-a tube bundle dust removal demister; 6-wet electric dust collector; 7-limestone-gypsum wet desulfurization unit.

Detailed Description

The present utility model has been described in terms of several embodiments, but the description is illustrative and not restrictive, and that many more embodiments and implementations are possible within the scope of the described embodiments for those of ordinary skill in the art. Any feature or element of any embodiment may be used in combination with or in place of any other feature or element of any other embodiment unless specifically limited.

The utility model provides a flue gas desulfurization, denitrification and dust removal system for a gypsum board production line, which comprises the following components: a heat exchange unit configured to exchange heat between a first flue gas generated by combustion of fuel and a cooling medium to reduce the temperature of the first flue gas to a denitration temperature to form a second flue gas; a denitration unit configured to introduce the second flue gas and perform a denitration reaction to remove nitrogen oxides in the second flue gas to form a third flue gas; a bag-type dust removing unit configured to remove dust particles in the cooled third flue gas to generate fourth flue gas and fifth flue gas, the fourth flue gas being returned to the heat exchange unit as a cooling medium; and the desulfurization unit is configured to introduce the fifth flue gas and remove sulfur dioxide and residual particles in the fifth flue gas to form sixth flue gas, and the sixth flue gas is discharged out of the flue gas desulfurization, denitrification and dust removal system.

Fig. 1 is a schematic diagram of a flue gas desulfurization, denitrification and dust removal system for a gypsum board production line according to an exemplary embodiment of the present utility model. As shown in fig. 1, the flue gas desulfurization, denitrification and dust removal system for a gypsum board production line of the present application comprises a heat exchange unit 1. In the heat exchange area of the heat exchange unit 1, the high-temperature first flue gas (usually at about 850 ℃) generated by fuel combustion (such as from a hot blast stove) is mixed with a cooling medium and cooled to 400 ℃ to obtain second flue gas, so that the temperature of the second flue gas reaches the temperature range of the selective catalytic reduction denitration reaction, and meanwhile, a denitration agent ammonia water solution with the concentration of 5-20% (which is specifically determined according to actual needs) is sprayed.

Then, the second flue gas and the denitration agent enter a selective catalytic reduction denitration unit 2 to remove nitrogen oxides in the second flue gas. The temperature of the denitration reaction is controlled to be about 380-420 ℃, the second flue gas and the catalyst are subjected to reduction reaction, and the denitration rate can reach more than 94%. And the second flue gas is denitrated to obtain third flue gas, and the temperature of the third flue gas can reach about 400 ℃.

The third flue gas may then be cooled. The method of reducing the temperature may include using the third flue gas to calcine the gypsum raw material. After calcination, the temperature of the third flue gas may be reduced to about 140 ℃. Then, the cooled third flue gas enters a bag-type dust removing unit 3 to be collected. The content of particles in the flue gas after dust removal is reduced to 10mg/m ³ The flue gas temperature may be further reduced below 130 ℃. The flue gas after dust removal can be divided into two parts, and one part of the flue gas is recycled as fourth flue gas through a pipeline valve and is conveyed back to the heat exchange area of the heat exchange unit 1 to be used as a cooling medium for exchanging heat with the high-temperature first flue gas. And the other part of the flue gas enters the subsequent equipment as fifth flue gas.

Next, the fifth flue gas proceeds to a limestone-gypsum wet desulfurization unit 7 integrating desulfurization and dust removal demisting. Firstly, fifth flue gas enters a spraying device 4, and desulfurization slurry is sprayed out from a nozzle of the spraying device 4 to spray and wash the fifth flue gas through gas-liquid mass transfer SO as to obtain SO (sulfur oxide) ₂ Reacts with the desulfurizing agent to generate the desulfurized gypsum, thereby removing SO in the flue gas ₂ The desulfurization efficiency can reach more than 96. SO-removal ₂ The fifth flue gas is firstly subjected to primary dust removal and demisting by a tube bundle dust removal demister 5 arranged above the spraying equipment 4And finally, removing tiny particles in the flue gas through a wet electric dust remover 6 above the tube bundle dust removal demister 5 to obtain purified sixth flue gas. The sixth flue gas enters the atmosphere through the chimney exhaust system.

Through detection, through the flue gas desulfurization, denitrification and dedusting system provided by the utility model, the flue gas emission generated by the whole gypsum board production line can finally reach the standard of near zero emission, namely, the NOx of nitrogen oxides in the sixth flue gas is less than or equal to 30mg/Nm ³ The method comprises the steps of carrying out a first treatment on the surface of the Sulfur dioxide SO ₂ ≤20mg/Nm ³ The method comprises the steps of carrying out a first treatment on the surface of the The particle is less than or equal to 5mg/Nm ³ The method comprises the steps of carrying out a first treatment on the surface of the The ringelman blackness is less than or equal to 1.

The flue gas desulfurization, denitrification and dedusting integrated system provided by the utility model has the advantages that the efficiency and the effect of denitration, desulfurization and dedusting are obviously improved, the production cost is reduced, and the economic benefit and the environmental protection performance of the whole gypsum production line are enhanced.

Although the embodiments of the present utility model are described above, the embodiments are only used for facilitating understanding of the present utility model, and are not intended to limit the present utility model. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is to be determined by the appended claims.

Claims

1. A flue gas desulfurization denitration dust pelletizing system for gypsum board production line, its characterized in that includes:

2. The flue gas desulfurization, denitrification and dust removal system according to claim 1, wherein the denitrification temperature is 400 ℃.

3. The flue gas desulfurization, denitrification and dust removal system according to claim 1, wherein the denitrification unit is a selective catalytic reduction denitrification unit.

4. The flue gas desulfurization, denitrification and dust removal system according to claim 1, wherein the temperature of the fourth flue gas as the cooling medium is lower than 130 ℃.

5. The flue gas desulfurization, denitrification and dust removal system according to claim 1, wherein the desulfurization unit is a limestone-gypsum wet desulfurization unit.

6. The flue gas desulfurization, denitrification and dust removal system according to claim 5, wherein the limestone-gypsum wet desulfurization unit comprises a spray apparatus, a tube bundle dust and mist eliminator disposed above the spray apparatus, and a wet electric precipitator disposed above the tube bundle dust and mist eliminator.