Desulfurization, dust removal and denitration integrated system with low-temperature composite ceramic fiber filter tube

Abstract

The utility model discloses a low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitration integrated system, which relates to the technical field of flue gas treatment and comprises a gas inlet flue, a dry desulfurization device, a composite ceramic fiber filter tube dust removal and denitration device, a gas outlet flue and a chimney which are communicated in sequence, a flue gas heating device is arranged on the gas inlet flue and is used for heating to-be-purified flue gas in the gas inlet flue, so that the to-be-purified flue gas can be subjected to dust removal and denitration treatment through the composite ceramic fiber filter tube dust removal and denitration device. The flue gas treatment device can be suitable for flue gas treatment of the industrial furnace with lower flue gas temperature, and the operating cost of environment-friendly equipment of the industrial furnace with lower flue gas temperature is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated system. Background Art

[0002] Existing flue gas desulfurization, dust removal and denitrification integrated systems, such as the composite ceramic fiber filter tube dry desulfurization combined with dust removal and denitrification integrated system disclosed in Chinese patent document CN219784323U, the system includes: a desulfurization reaction device for achieving flue gas desulfurization; an ammonia injection subsystem for mixing ammonia water into the flue gas, the ammonia injection subsystem including an ammonia injection grid; a dust removal and denitrification device for achieving flue gas dust removal and denitrification, the dust removal and denitrification device including a device shell, a purification chamber and a smoke exhaust chamber provided in the device shell, the purification chamber and the smoke exhaust chamber are connected through a dust removal and denitrification integrated unit, a mixing flue is connected to the purification chamber, and a smoke exhaust channel is connected to the smoke exhaust chamber, the desulfurization reaction device is connected to the mixing flue, an ammonia injection grid is provided in the mixing flue, and the ammonia injection grid is provided between the desulfurization reaction device and the dust removal and denitrification device.

[0003] Although the above technical solution improves the traditional flue gas treatment mode of "desulfurization + dust removal + denitrification", that is, the series connection of multiple treatment equipment, into an integrated desulfurization, dust removal and denitrification mode, this type of composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated device is only suitable for industrial furnaces with flue gas temperatures between 250℃ and 400℃. For industrial furnaces with flue gas temperatures below 250℃, the flue gas discharged cannot reach the temperature required for flue gas purification. Utility Model Content

[0004] The purpose of this utility model is to provide an integrated desulfurization, dust removal and denitrification system of low-temperature composite ceramic fiber filter tubes to solve the problems existing in the above-mentioned related technologies. It can be applied to the flue gas treatment of industrial furnaces with low flue gas temperatures, thereby reducing the operating costs of environmental protection equipment for industrial furnaces with low flue gas temperatures.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The utility model provides a low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated system, comprising an air intake flue, a dry desulfurization device, a composite ceramic fiber filter tube dust removal and denitrification device, an air outlet flue and a chimney connected in sequence, the inlet of the air intake flue being used to be connected with the flue gas outlet of the furnace, and a flue gas heating device being provided on the air intake flue, the flue gas heating device being used to heat the flue gas to be purified in the air intake flue, so that the flue gas to be purified can be dusted and denitrified by the composite ceramic fiber filter tube dust removal and denitrification device.

[0007] Preferably, the flue gas heating device includes a burner, a burner port is provided on the air inlet flue, and the flame nozzle of the burner is connected to the burner port.

[0008] Preferably, the flue gas heating device also includes a blower, the air outlet of the blower is connected to the air inlet of the burner through a first air supply pipeline, and a second air supply pipeline is connected to the first air supply pipeline, and the second air supply pipeline is used to introduce natural gas at one end away from the first air supply pipeline.

[0009] Preferably, the dry desulfurization device includes a desulfurization tower, the flue gas inlet of the desulfurization tower is connected to the air inlet flue, and the flue gas outlet of the desulfurization tower is connected to the composite ceramic fiber filter tube dust removal and denitrification device.

[0010] Preferably, a desulfurizer inlet and an ammonia injection port are provided on the air inlet flue at a position between the combustion port and the desulfurization tower. The desulfurizer inlet is used to introduce the desulfurizer so that the flue gas to be purified in the desulfurization tower can undergo a desulfurization reaction; the ammonia injection port is used to inject ammonia so that the flue gas to be purified in the composite ceramic fiber filter tube dust removal and denitrification device can undergo a denitrification reaction.

[0011] Preferably, an induced draft device is provided on the exhaust flue, and the induced draft device includes a plurality of induced draft fans, wherein at least one induced draft fan is connected in series to the exhaust flue, and another induced draft fan is connected in parallel to the exhaust flue.

[0012] Preferably, a waste heat recovery device is further provided on the exhaust flue, and the waste heat recovery device includes a waste heat boiler, and the waste heat boiler is connected in series to the exhaust flue.

[0013] Preferably, the waste heat recovery device further includes a bypass flue, one end of which is connected to a position on the outlet flue close to the flue gas inlet of the waste heat boiler, and the other end is connected to a position on the outlet flue close to the flue gas outlet of the waste heat boiler.

[0014] Compared with the related art, the utility model has achieved the following technical effects:

[0015] The utility model provides a low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated system, comprising an air intake flue, a dry desulfurization device, a composite ceramic fiber filter tube dust removal and denitrification device, an air outlet flue and a chimney which are connected in sequence, wherein a flue gas heating device is provided on the air intake flue. During operation, the flue gas to be purified from the flue gas outlet of the furnace enters the air intake flue, is first desulfurized by the dry desulfurization device, and then is dusted and denitrified by the composite ceramic fiber filter tube dust removal and denitrification device. The purified flue gas is discharged into the chimney through the air outlet flue. During this process, the flue gas to be purified with a lower temperature in the air intake flue can be heated by the flue gas heating device on the air intake flue, so that the flue gas to be purified reaches the temperature required for the subsequent flue gas treatment by the composite ceramic fiber filter tube dust removal and denitrification device. Therefore, this system is suitable for the flue gas treatment of industrial furnaces with low flue gas temperatures, thereby reducing the operating costs of environmental protection equipment for industrial furnaces with low flue gas temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the working process of the low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated system provided in an embodiment of the present utility model.

[0018] In the figure: 1-air inlet flue, 2-desulfurization tower, 3-composite ceramic fiber filter tube dust removal and denitrification device, 4-air outlet flue, 5-chimney, 6-burner, 7-blower, 8-first air supply pipeline, 9-second air supply pipeline, 10-induced draft fan, 11-waste heat boiler, 12-bypass flue. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0020] The purpose of this utility model is to provide an integrated desulfurization, dust removal and denitrification system of low-temperature composite ceramic fiber filter tubes to solve the problems existing in related technologies. It can be applied to the flue gas treatment of industrial furnaces with low flue gas temperatures, thereby reducing the operating costs of environmental protection equipment for industrial furnaces with low flue gas temperatures.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0022] like Figure 1 As shown, this embodiment provides a low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated system, including an air inlet flue 1, a desulfurization tower 2, a composite ceramic fiber filter tube dust removal and denitrification device 3, an air outlet flue 4 and a chimney 5 connected in sequence. The inlet of the air inlet flue 1 is used to be connected with the flue gas outlet of the furnace, and a flue gas heating device is provided on the air inlet flue 1. The flue gas heating device is used to heat the flue gas to be purified in the air inlet flue 1 so that the flue gas to be purified can be dusted and denitrified through the composite ceramic fiber filter tube dust removal and denitrification device 3.

[0023] In this embodiment, the flue gas heating device includes a burner 6, and a combustion port is provided on the air inlet flue 1. The flame nozzle of the burner 6 is connected to the combustion port. The burner 6 sprays flame into the air inlet flue 1 to directly heat the flue gas to be purified in the air inlet flue 1, thereby increasing the temperature of the flue gas to reach the temperature required for the subsequent composite ceramic fiber filter tube dust removal and denitrification device 3 to perform flue gas treatment, so that the system can complete dust removal and denitrification when the flue gas temperature is above 200°C.

[0024] Furthermore, the flue gas heating device also includes a blower 7, the air outlet of the blower 7 is connected to the air inlet of the burner 6 through a first air supply pipeline 8, and the first air supply pipeline 8 is connected to a second air supply pipeline 9. The end of the second air supply pipeline 9 away from the first air supply pipeline 8 is used to introduce natural gas. The natural gas in this embodiment comes from the plant's public engineering system.

[0025] In this embodiment, a desulfurizer inlet and an ammonia injection port are provided on the air inlet flue 1 at a position between the combustion port and the desulfurization tower 2. The desulfurizer inlet is used to introduce the desulfurizer so that the flue gas to be purified in the desulfurization tower 2 can undergo a desulfurization reaction; the ammonia injection port is used to inject ammonia so that the flue gas to be purified in the composite ceramic fiber filter tube dust removal and denitrification device 3 can undergo a denitrification reaction.

[0026] It should be noted that the desulfurizer in this embodiment can be selected from desulfurizers commonly used in dry desulfurization processes such as slaked lime; after the desulfurizer and ammonia are added to the air inlet flue 1, the desulfurizer is mixed with the flue gas to be purified and first enters the desulfurization tower 2 for desulfurization, and then enters the composite ceramic fiber filter tube dust removal and denitrification device 3, which can prevent the composite ceramic fiber filter tube dust removal and denitrification device 3 from being poisoned by ammonium sulfate due to low temperature, and the desulfurizer by-products can be discharged through the ash discharge port at the bottom of the composite ceramic fiber filter tube dust removal and denitrification device 3.

[0027] It should be noted that the composite ceramic fiber filter tube dust removal and denitrification device 3 is a mature equipment on the market. Its internal core structure is a composite ceramic fiber filter tube (also known as a catalytic ceramic fiber filter tube). The composite ceramic fiber filter tube can effectively avoid the impact of flue gas containing a large amount of dust, such as kiln flue gas, alkaline biomass combustion flue gas, cement kiln flue gas, etc., on the life of traditional SCR catalysts, so that enterprises no longer need to pay a lot of operating costs for replacing SCR catalysts; the unique production process of the composite ceramic fiber filter tube ensures that the SCR catalyst is located inside the wall of the composite ceramic fiber filter tube. The surface layer of the composite ceramic fiber filter tube can effectively remove dust in the flue gas, so that harmful components will not come into contact with the SCR catalyst inside the tube wall. Compared with traditional filter bag devices, it can adapt to higher operating temperatures and is more efficient.

[0028] It should be noted that, in this embodiment, the flue gas heating device is jointly controlled with the outlet temperature of the composite ceramic fiber filter tube dust removal and denitrification device 3. When the outlet temperature is lower than 200°C, the flue gas heating device is started to ensure the temperature required for the operation of the composite ceramic fiber filter tube dust removal and denitrification device 3; when ammonium sulfate poisoning occurs in the composite ceramic fiber filter tube dust removal and denitrification device 3, the flue gas heating device is started to heat and activate the composite ceramic fiber filter tube dust removal and denitrification device 3.

[0029] In this embodiment, an induced draft device is provided on the exhaust flue 4, and the induced draft device includes multiple induced draft fans 10, wherein at least one induced draft fan 10 is connected in series to the exhaust flue 4, and another induced draft fan 10 is connected in parallel to the exhaust flue 4, that is, the two induced draft fans 10 are one in use and one in reserve.

[0030] In this embodiment, a waste heat recovery device is also provided on the exhaust flue 4. The waste heat recovery device includes a waste heat boiler 11. The waste heat boiler 11 is connected in series to the exhaust flue 4. The waste heat of the purified flue gas in the exhaust flue 4 can be recovered through the waste heat boiler 11.

[0031] Furthermore, the waste heat recovery device also includes a bypass flue 12, one end of the bypass flue 12 is connected to a position on the outlet flue 4 close to the flue gas inlet of the waste heat boiler 11, and the other end is connected to a position on the outlet flue 4 close to the flue gas outlet of the waste heat boiler 11; when the waste heat boiler 11 fails or needs maintenance, the waste heat boiler 11 is cut out of the outlet flue 4, and at the same time, the bypass flue 12 is opened to ensure that the system continues to operate.

[0032] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated system, characterized by: It includes an air intake flue, a dry desulfurization device, a composite ceramic fiber filter tube dust removal and denitrification device, an air outlet flue and a chimney that are connected in sequence. The inlet of the air intake flue is used to be connected with the flue gas outlet of the furnace, and the air intake flue is provided with a flue gas heating device. The flue gas heating device is used to heat the flue gas to be purified in the air intake flue so that the flue gas to be purified can be dusted and denitrified by the composite ceramic fiber filter tube dust removal and denitrification device.

2. The low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated system according to claim 1 is characterized in that: The flue gas heating device includes a burner, a burner port is provided on the air inlet flue, and the flame nozzle of the burner is connected to the burner port.

3. The low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated system according to claim 2 is characterized in that: The flue gas heating device also includes a blower, the air outlet of the blower is connected to the air inlet of the burner through a first air supply pipeline, and a second air supply pipeline is connected to the first air supply pipeline, and the end of the second air supply pipeline away from the first air supply pipeline is used to introduce natural gas.

4. The low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated system according to claim 2 is characterized in that: The dry desulfurization device includes a desulfurization tower, a flue gas inlet of the desulfurization tower is connected to the air inlet flue, and a flue gas outlet of the desulfurization tower is connected to the composite ceramic fiber filter tube dust removal and denitrification device.

5. The low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated system according to claim 4 is characterized in that: A desulfurizer inlet and an ammonia injection port are provided on the air inlet flue at a position between the combustion port and the desulfurization tower. The desulfurizer inlet is used to introduce the desulfurizer so that the flue gas to be purified in the desulfurization tower can undergo a desulfurization reaction; the ammonia injection port is used to inject ammonia so that the flue gas to be purified in the composite ceramic fiber filter tube dust removal and denitrification device can undergo a denitrification reaction.

6. The low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated system according to claim 1 is characterized in that: The exhaust duct is provided with an induced draft device, which includes a plurality of induced draft fans, wherein at least one induced draft fan is connected in series to the exhaust duct, and another induced draft fan is connected in parallel to the exhaust duct.

7. The low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated system according to claim 6, characterized in that: The exhaust flue is further provided with a waste heat recovery device, which includes a waste heat boiler, and the waste heat boiler is connected in series to the exhaust flue.

8. The low-temperature composite ceramic fiber filter tube desulfurization, dust removal and denitrification integrated system according to claim 7, characterized in that: The waste heat recovery device also includes a bypass flue, one end of which is connected to a position on the outlet flue close to the flue gas inlet of the waste heat boiler, and the other end is connected to a position on the outlet flue close to the flue gas outlet of the waste heat boiler.

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