Glass kiln waste heat boiler flue gas treatment system

Abstract

The utility model provides a glass kiln waste heat boiler flue gas treatment system which is characterized in that the glass kiln waste heat boiler flue gas treatment system comprises a waste heat boiler, a desulfurization device, a dust removal device, a denitration device, a discharge chimney and an ash bin, and a high-temperature section flue gas outlet of the waste heat boiler is connected with a flue gas inlet of the desulfurization device through a flue gas conveying pipeline; a flue gas outlet of the desulfurization device is connected with an inlet of the dust removal device, and the dust removal device is provided with an upper flue gas outlet and a lower ash discharge port; a flue gas outlet above the dust removal device is connected with the denitration device, and a flue gas outlet of the denitration device is connected with a low-temperature section of the waste heat boiler through a flue gas return pipeline; a first ash conveying pipeline and a second ash conveying pipeline are connected to an ash discharging opening in the lower portion of the dust removal device, the first ash conveying pipeline is connected with the desulfurization device, the second ash conveying pipeline is connected with an ash bin, and a low-temperature section smoke outlet of the waste heat boiler is connected with a discharging chimney through a smoke discharging pipeline. According to the utility model, the problems of easy blockage and low waste heat recovery efficiency in the flue gas treatment of the waste heat boiler of the glass kiln are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas purification, in particular to a flue gas treatment system for a waste heat boiler of a glass furnace. Background Art

[0002] In the batching of glass production, there are soda ash, glauber's salt and other elements containing alkali metals and alkaline earth metals, resulting in a large amount of alkali metals in the flue gas dust of the glass furnace, with high viscosity and high SO3 content. These viscous dusts and acidic gases can generate molten and highly viscous substances in the waste heat boiler, adhere to the heating surface of the waste heat boiler, and form a hard ash fouling layer, which is difficult to remove; after the ash fouling layer condenses and solidifies in the waste heat boiler, the formed alkali metal dust particles also have high adhesiveness. These highly adhesive alkali metal dust particles enter the backend SCR denitration reactor with the flue gas, which will cause the surface of the catalyst to cake and be difficult to clean, and then lead to catalyst blockage and poisoning; in addition, due to the high SO3 content in the flue gas, ammonium bisulfate and alkali metal sulfates will be formed with the SCR denitration agent, and these substances will cause corrosion and blockage in the low-temperature section of the waste heat boiler. Therefore, due to the flue gas characteristics of the waste heat boiler of the glass furnace, there are the following problems in the existing flue gas treatment of the waste heat boiler of the glass furnace: the SCR denitration catalyst is easy to be blocked and poisoned, the denitration efficiency is low, the ammonia escape is high, and the catalyst needs to be replaced frequently; the whole waste heat boiler is easy to be blocked, and the low-temperature part is prone to corrosion. The boiler needs to be cleaned and replaced manually regularly, and the maintenance workload is large; due to the blockage problem, after the waste heat boiler operates for a period of time, the heat exchange efficiency will be greatly reduced, the exhaust gas temperature will rise significantly, the thermal efficiency is low, and a large amount of energy is wasted.

[0003] The flue gas desulfurization of the waste heat boiler mainly adopts the desulfurization process in the low-temperature section of the boiler. To reduce the corrosion of the heat exchange surface of the waste heat boiler, the flue gas temperature at the outlet of the waste heat boiler needs to be maintained above 180°C, resulting in a reduction in the heat exchange efficiency of the waste heat boiler and a large amount of wasted heat energy.

[0004] In summary, how to solve the problems of easy blockage and low waste heat recovery efficiency in the flue gas treatment of the waste heat boiler of the glass furnace has become an urgent technical problem for those skilled in the art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a flue gas treatment system for a waste heat boiler of a glass furnace to solve the problems of easy blockage and low waste heat recovery efficiency existing in the flue gas treatment of the waste heat boiler of the glass furnace.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The present utility model provides a flue gas treatment system for a waste heat boiler of a glass furnace, which is characterized by comprising: a waste heat boiler, a desulfurization device, a dust removal device, a denitration device, an emission chimney and an ash bin. Among them, the flue gas outlet of the high-temperature section of the waste heat boiler is connected to the flue gas inlet of the desulfurization device through a flue gas transmission pipeline; the flue gas outlet of the desulfurization device is connected to the inlet of the dust removal device, and the dust removal device has an upper flue gas outlet and a lower ash discharge port; the upper flue gas outlet of the dust removal device is connected to the denitration device, and the flue gas outlet of the denitration device is connected to the low-temperature section of the waste heat boiler through a flue gas return pipeline; the lower ash discharge port of the dust removal device is connected with a first ash conveying pipeline and a second ash conveying pipeline. The first ash conveying pipeline is connected to the desulfurization device, and the second ash conveying pipeline is connected to the ash bin. The flue gas outlet of the low-temperature section of the waste heat boiler is connected to the emission chimney through a flue gas emission pipeline.

[0008] Further, in the flue gas treatment system for a waste heat boiler of a glass furnace provided by the present utility model, it can also have the following characteristics: among them, the desulfurization device includes a shell and a fluidized bed structure arranged in the shell, and the fluidized bed structure has a desulfurizer layer.

[0009] Further, in the flue gas treatment system for a waste heat boiler of a glass furnace provided by the present utility model, it can also have the following characteristics: among them, the dust removal device is a metal filter screen dust collector, and a plurality of metal filter tubes are arranged in the dust removal device.

[0010] Further, in the flue gas treatment system for a waste heat boiler of a glass furnace provided by the present utility model, it can also have the following characteristics: among them, a denitration catalyst layer is arranged in the denitration device.

[0011] Further, in the flue gas treatment system for a waste heat boiler of a glass furnace provided by the present utility model, it can also have the following characteristics: among them, the desulfurization device is integrally arranged on the top of the dust removal device and is an integral structure with the dust removal device.

[0012] Further, in the flue gas treatment system for a waste heat boiler of a glass furnace provided by the present utility model, it can also have the following characteristics: among them, a smoke exhaust fan is arranged on the flue gas emission pipeline between the waste heat boiler and the emission chimney.

[0013] The beneficial effects of the present utility model:

[0014] In the flue gas treatment system of the waste heat boiler of the glass furnace provided by the present utility model, the desulfurizer layer of the fluidized bed structure of the desulfurization device can efficiently remove acidic gases such as SO2 and SO3 in the flue gas. The material bed layer wraps and modulates the viscous dust in the flue gas, greatly reducing the viscosity of the original dust, avoiding the problem that the dust adheres to the metal membrane filter bag and easily clogs the flue gas dust removal device, as well as the problems of blockage, corrosion, and poisoning caused by the low-temperature section of the waste heat boiler. In addition, the dust removal device uses metal filter tubes, which are heat-resistant and can handle the flue gas in the high-temperature section of the waste heat boiler. The flue gas does not need to be cooled before dust removal, thus greatly improving the waste heat recovery efficiency. In addition, the desulfurization device is integrally arranged on the top of the dust removal device, reducing the floor area and investment. At the same time, the flow rate of the denitrified flue gas is reduced, resulting in high denitrification reaction efficiency and low system resistance. In addition, the returned clean flue gas can be used for waste heat utilization of the glass furnace, and the exhaust gas temperature can also be further reduced, thus achieving pollution reduction and carbon reduction. The flue gas treatment system of the waste heat boiler of the glass furnace provided by the present utility model has the advantages of small floor area, compact layout, economic reliability, and being able to respond and adjust in a timely manner according to the furnace pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is a schematic structural diagram of the flue gas treatment system of the waste heat boiler of the glass furnace in an embodiment of the present utility model;

[0016] Figure 2 FIG. is a schematic structural diagram of the desulfurization device in an embodiment of the present utility model.

[0017] Reference numerals in the figure: waste heat boiler 1 of the glass furnace; desulfurization device 2; flue gas inlet 2a; flue gas outlet 2b; ash inlet 2c; dust removal device 3; first ash conveying pipeline 41; second ash conveying pipeline 42; flue gas conveying pipeline 43; flue gas return pipeline 44; flue gas discharge pipeline 45; flue gas conveying pipeline 46; ash bin 5; metal filter tube 6; denitrification device 7; exhaust fan 8; discharge chimney 9. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the technical means, creative features, achieved purposes, and functions of the present utility model easy to understand, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0019] See Figure 1 , an embodiment of the present utility model provides a flue gas treatment system for a waste heat boiler of a glass furnace, which includes a waste heat boiler 1, a desulfurization device 2, a dust removal device 3, a denitrification device 7, a discharge chimney 9, and an ash bin 5.

[0020] The high-temperature flue gas outlet of the waste heat boiler 1 is connected to the flue gas inlet of the desulfurization device 2 through a flue gas transmission pipeline 41. The desulfurization device 2 includes a housing and a fluidized bed structure arranged inside the housing. The fluidized bed structure includes a desulfurizer layer and a material bed layer. The desulfurizer uses commercially available desulfurizer, and the material bed layer is a high-density material bed layer formed by piling up desulfurization ash. See Figure 2 , the flue gas inlet 2a of the desulfurization device 2 is at the lower end, the flue gas outlet 2b is at the upper end, and the ash inlet 2c is at the lower end and above the flue gas inlet 2a. The flue gas entering the desulfurization device 2 first passes through the material bed layer and then through the desulfurizer layer. In the actual application process, after the flue gas discharged from the waste heat boiler 1 of the glass furnace enters the desulfurization device 2, by using the violently turbulent flue gas flow inside the housing in cooperation with the fluidized bed structure, efficient removal of acidic gases such as SO2 and SO3 in the flue gas can be achieved. The material bed layer wraps and conditions the viscous dust in the flue gas, greatly reducing the viscosity of the original dust, and can avoid the problem that the dust adheres to the filter element of the dust removal device, resulting in easy blockage of the subsequent flue gas treatment device. The sulfur and dust in the flue gas have been completely removed, enabling the subsequent denitration device to operate in a clean and dust-free environment, and there is no longer a problem of ash accumulation and blockage in the equipment. And because the SO3 gas is removed, basically no ammonium bisulfate is generated subsequently, solving the subsequent problems associated with ammonium bisulfate.

[0021] The flue gas outlet of the desulfurization device 2 is connected to the inlet of the dust removal device 3 through a flue gas transmission pipeline 46. The dust removal device 3 has an upper flue gas outlet and a lower ash discharge port. The dust removal device 3 is a metal mesh filter dust collector, and several metal filter tubes 6 are arranged in the dust removal device 3. The metal filter tube 6, as the core filter element in the dust removal device 3, is made of 316L stainless steel.

[0022] The lower ash discharge port of the dust removal device 3 is connected with a first ash conveying pipeline 41 and a second ash conveying pipeline 42. The first ash conveying pipeline 41 is connected to the desulfurization device 2 to return part of the desulfurization ash to the desulfurization device 2 to realize material circulation and form a high-density material bed layer. The second ash conveying pipeline 42 is connected to the ash bin 5 for collecting desulfurization ash.

[0023] The clean flue gas after dust removal enters the denitration device for denitration. The upper flue gas outlet of the dust removal device 3 is connected to the denitration device 7. A denitration catalyst layer is arranged in the denitration device 7, and the denitration catalyst uses commercially available products. The desulfurization device 2 is integrally arranged on the top of the dust removal device 3 and is an integral structure with the dust removal device 3. This integrated structure reduces the land occupation and investment required for the denitration equipment, and at the same time reduces the flue gas flow rate required for the denitration device 7, making the denitration reaction efficient and the system resistance low.

[0024] The flue gas outlet of the denitration device 7 is connected to the low-temperature section of the waste heat boiler 1 through the flue gas return pipe 44. After further efficient heat recovery in the waste heat boiler 1, it is then sent to the emission chimney 9 for emission. The outlet of the low-temperature section of the waste heat boiler 1 is connected to the emission chimney 9 through the flue gas discharge pipe 45. A smoke exhaust fan 8 is provided on the flue gas discharge pipe 45 to guide the smooth discharge of the flue gas.

[0025] The working process of the waste heat boiler flue gas treatment system of the glass furnace in the embodiment of the present utility model is as follows: The high-temperature dusty flue gas at about 350 °C led out from the high-temperature section of the waste heat boiler 1 enters the desulfurization device 2. Through the desulfurization device 2, acidic gases such as SO2 and SO3 are efficiently removed, and at the same time, the highly viscous fly ash in the flue gas is wrapped and conditioned, greatly reducing the dust viscosity and avoiding adhesion and caking. The desulfurized flue gas enters the dust removal device 3 to achieve flue gas dust removal. Part of the desulfurized ash returns to the desulfurization device 2 through the first ash conveying pipe 41, and the other part is discharged to the ash bin 5 through the second ash conveying pipe 42. The clean flue gas after dust removal then enters the denitration device 6 for denitration. Thus, flue gas desulfurization, dust removal, and denitration are completed under high-temperature conditions, creating a clean environment for the subsequent low-temperature section of the waste heat boiler 1. The clean flue gas coming out of the denitration device 6 is further efficiently heat recovered by the waste heat boiler 1, and then enters the emission chimney 9 for emission through the smoke exhaust fan 8.

[0026] Taking a 1000t / d glass furnace as an example, the working conditions of the flue gas treatment system of the glass furnace described in the present utility model are specifically described as follows:

[0027] 1) The high-temperature flue gas at about 350 °C is led out from the high-temperature section of the waste heat boiler 1. At this time, the flue gas contains a certain amount of alkali metal molten highly viscous fly ash. These flue gases undergo an efficient contact reaction with the desulfurization agent and the circulating desulfurized ash in the desulfurization device 2. Acidic gases such as SO2 in the flue gas are effectively removed, and the highly viscous fly ash has its viscosity greatly reduced under the wrapping of the absorbent and the circulating ash, making it easy to clean. Finally, the outlet flue gas can reach SO2 ≤ 50mg / Nm 3 。

[0028] 2) The desulfurized flue gas enters the dust removal device 3 and is dusted through the metal filter tube 6, effectively filtering and removing the conditioned desulfurized ash, and the dust concentration can be controlled at ≤ 10mg / Nm 3 。The collected desulfurized ash, part of it is returned to the desulfurization device 2 as circulating ash for recycling, and part of it is sent to the ash bin 5 for external discharge.

[0029] 3) The flue gas after desulfurization and dust removal enters the denitration device 7 for denitration. By uniformly spraying ammonia, the uniformity of the denitration flow field can be effectively ensured, the denitration efficiency can be improved, and the resistance of the denitration device system can be reduced. The NOx in the flue gas after passing through the denitration device (7) can be effectively controlled at 50mg / Nm 3 、and the resistance of the catalyst layer ≤ 150Pa.

[0030] 4) The clean flue gas after desulfurization, dust removal, and denitration returns to the low-temperature section of the waste heat boiler 1 for waste heat recovery, and the boiler thermal efficiency can be increased by 4-7%. The flue gas is clean, and the temperature of the flue gas returning to the waste heat boiler 1 is about 240°C. It is no longer easy to form sticky and corrosive substances such as ammonium bisulfate and ammonium sulfate in the medium-temperature section, and the dew point corrosion problem in the low-temperature section is also solved. The utilization of the returned waste heat can effectively reduce the exhaust gas temperature of the waste heat boiler 1 and improve the thermal efficiency of the waste heat boiler. Finally, the exhaust gas temperature can be controlled at about 130°C.

[0031] 5) After the low-temperature waste heat recovery, finally, the clean and clear flue gas is led to the discharge chimney 9 for discharge.

[0032] 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 principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flue gas treatment system for waste heat boiler of a glass kiln, characterized in that: include: Waste heat boiler, desulfurization device, dust removal device, denitrification device, emission chimney and ash silo, Wherein, the high temperature section flue gas outlet of the waste heat boiler is connected to the flue gas inlet of the desulfurization device through a flue gas conveying pipeline; The flue gas outlet of the desulfurization device is connected to the inlet of the dust removal device, and the dust removal device has an upper flue gas outlet and a lower ash discharge outlet; The upper flue gas outlet of the dust removal device is connected to the denitration device, and the flue gas outlet of the denitration device is connected to the low-temperature section of the waste heat boiler through a flue gas return pipeline; The lower ash discharge port of the dust removal device is connected to a first ash conveying pipeline and a second ash conveying pipeline, the first ash conveying pipeline is connected to the desulfurization device, and the second ash conveying pipeline is connected to the ash bin; The low temperature section smoke outlet of the waste heat boiler is connected to the emission chimney through a smoke emission pipeline.

2. The glass furnace waste heat boiler flue gas treatment system according to claim 1, characterized in that: in, The desulfurization device comprises a shell and a fluidized bed structure arranged in the shell, and the fluidized bed structure comprises a desulfurization agent layer and a material bed layer.

3. The glass furnace waste heat boiler flue gas treatment system according to claim 1, characterized in that: in, The dust removal device is a metal filter dust collector, and a plurality of metal filter tubes are arranged in the dust removal device.

4. The glass furnace waste heat boiler flue gas treatment system according to claim 1, characterized in that: in, The denitration device is provided with a denitration catalyst layer.

5. The glass furnace waste heat boiler flue gas treatment system according to claim 1 or 4, characterized in that: in, The desulfurization device is integrated on the top of the dust removal device and forms an integral structure with the dust removal device.

6. The glass furnace waste heat boiler flue gas treatment system according to claim 1, characterized in that: in, The smoke exhaust pipes of the waste heat boiler and the exhaust chimney are provided with smoke exhaust fans.

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