Calcium oxide synergistic desulfurization and water removal system for dry quenching dust removal

Abstract

The utility model provides a calcium oxide collaborative desulfurization and water removal system for dry quenching dust removal, which belongs to the technical field of dry quenching desulfurization and comprises a calcium oxide conveying system and a compressed air blowing assisting pipe. The calcium oxide conveying system comprises a calcium oxide bin, a rotary feeder, a Roots blower and a calcium oxide conveying pipeline, the rotary feeder is arranged at the bottom of the calcium oxide bin, an outlet of the rotary feeder is communicated with the Roots blower and the calcium oxide conveying pipeline, and the calcium oxide conveying pipeline is communicated with the high-temperature dust removal pipeline and the low-temperature dust removal pipeline; and the compressed air blowing assisting pipe is arranged at the calcium oxide conveying pipeline. The calcium oxide conveying system is additionally arranged, so that condensed water in dusty gas is eliminated, the phenomenon that the condensed water easily leaks from high-temperature and low-temperature dust removal pipelines is solved, and meanwhile, the desulfurization efficiency of the system can be improved by heat and reaction products released by the reaction of calcium oxide and the condensed water.

Description

Technical Field

[0001] This utility model belongs to the field of dry quenching desulfurization technology, specifically relating to a calcium oxide-assisted desulfurization and dehydration system for dry quenching dust removal. Background Technology

[0002] With the increasing stringent national requirements for flue gas emission control, dry quenching has gradually replaced wet quenching as the mainstream quenching technology in the current coking market. Its supporting dust removal system has also become a focus of attention. To ensure that the sulfur concentration of the emitted flue gas meets national standards, dry quenching dust removal systems often employ calcium-based dry desulfurization systems to treat dust-laden gases. The dust-laden gases in the high- and low-temperature dust removal pipelines mainly include flue gas generated during coke charging at the top of the dry quenching furnace, flue gas released during pressure regulation in the pre-storage chamber at the top of the dry quenching furnace, flue gas released after the dry quenching circulating fan, and flue gas generated during coke discharge at the bottom of the dry quenching furnace; and both high- and low-temperature dust removal pipelines contain water vapor.

[0003] However, during winter operation, the temperature of the dust-laden gas drops due to the decrease in outdoor temperature, causing liquid water to precipitate out. The liquid water mixes with the dust particles to form solid precipitates, which are deposited on the lower surface of the low-temperature dust removal pipeline. This reduces the cross-sectional area of ​​the flue gas flowing through the pipeline, and condensate leakage is likely to occur at the compensators of the high and low temperature dust removal pipelines. Utility Model Content

[0004] Based on the above-mentioned technical problems, the purpose of this utility model is to provide a calcium oxide-co-coal oxide desulfurization and dehydration system for dry quenching dust removal. By adding a calcium oxide conveying system, condensate in the dust-laden gas is eliminated, solving the problem of condensate leakage that easily occurs in high and low temperature dust removal pipelines. At the same time, the heat and reaction products released by the reaction of calcium oxide and condensate can improve the desulfurization efficiency of the system.

[0005] The specific technical solution is as follows:

[0006] A calcium oxide-based dry desulfurization and dehydration system for dry quenching coke dust removal is disclosed. The dry quenching coke calcium-based dry desulfurization system includes a dust removal system and a desulfurization system. The dust removal system is equipped with a high-temperature dust removal pipeline and a low-temperature dust removal pipeline, and the desulfurization system is connected to the high-temperature dust removal pipeline. The system includes a calcium oxide conveying system and a compressed air auxiliary blowing pipe. The calcium oxide conveying system includes a calcium oxide silo, a rotary feeder, a Roots blower, and a calcium oxide conveying pipeline. The bottom of the calcium oxide silo is equipped with a rotary feeder, the outlet of which is connected to both the Roots blower and the calcium oxide conveying pipeline. The calcium oxide conveying pipeline is connected to both the high-temperature dust removal pipeline and the low-temperature dust removal pipeline. The compressed air auxiliary blowing pipe is located at the calcium oxide conveying pipeline.

[0007] In addition, the calcium oxide-assisted desulfurization and dehydration system for dry quenching dust removal provided by this utility model may also have the following additional technical features:

[0008] In the above technical solution, the calcium oxide conveying pipeline includes: a conveying pipe, a first connecting pipe and a second connecting pipe; the conveying pipe is connected to the outlet of the rotary feeder; the first connecting pipe is connected to the conveying pipe, the first connecting pipe is provided with at least two first spray nozzles, and the first spray nozzles are connected to the high-temperature dust removal pipeline; the second connecting pipe is connected to the conveying pipe, the second connecting pipe is provided with at least two second spray nozzles, and the second spray nozzles are connected to the low-temperature dust removal pipeline.

[0009] In the above technical solution, the distance between two adjacent first spray nozzles and two adjacent second spray nozzles is 20-35m.

[0010] The above technical solution also includes: a silencer; the silencer is installed at the outlet of the Roots blower.

[0011] In the above technical solution, variable diameter pipes are respectively installed at the first and second spray nozzles.

[0012] In the above technical solution, the compressed air blowing pipe is connected to the first connecting pipe and the second connecting pipe respectively.

[0013] The above technical solution also includes: a first temperature measuring point and a second temperature measuring point; the first temperature measuring point is set at the outlet of the high-temperature dust removal pipe; the second temperature measuring point is set at the outlet of the low-temperature dust removal pipe; both the first temperature measuring point and the second temperature measuring point are electrically connected to the rotary feeder through the control system.

[0014] This utility model discloses a calcium oxide-based synergistic desulfurization and dehydration system for dry quenching dust removal. Compared with existing technologies, the advantages are as follows:

[0015] 1. By adding a calcium oxide conveying system, the calcium oxide powder moves along the calcium oxide conveying pipeline under the action of the rotary feeder and the Roots blower, and is evenly sprayed above the high-temperature dust removal pipeline and the low-temperature dust removal pipeline, so that the calcium oxide powder can fully contact and react with condensate and water vapor, thereby eliminating condensate in the dust-laden gas. This avoids the phenomenon of condensate leakage at the compensators of the high and low temperature dust removal pipelines, and also reduces the formation of solid precipitates caused by liquid water precipitation, thereby reducing the occurrence of pipeline blockage.

[0016] 2. Calcium oxide powder is sprayed into high and low temperature dust removal pipelines to react with condensate in the dust-laden gas. This eliminates condensate, and the heat and reaction products released by the reaction between calcium oxide and condensate can improve the desulfurization efficiency of the dry desulfurization system based on calcium oxide in winter operation, thereby reducing the amount of desulfurizing agent used and improving the overall stability of the dust removal system.

[0017] 3. Add a compressed air blowing pipe to the horizontal section of the calcium oxide conveying pipeline to prevent calcium oxide powder from clogging the calcium oxide conveying pipeline. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a calcium oxide-assisted desulfurization and dehydration system for dry quenching and dust removal according to the present invention.

[0019] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0020] 10 Desulfurization system, 11 High-temperature dust removal pipeline, 12 Low-temperature dust removal pipeline, 13 Calcium oxide silo, 14 Rotary feeder, 15 Roots blower, 16 Compressed air auxiliary blowing pipe, 17 Conveying pipe, 18 First connecting pipe, 19 Second connecting pipe, 20 First spray nozzle, 21 Second spray nozzle, 22 Silencer, 23 First temperature measuring point, 24 Second temperature measuring point, 25 Dust hood, 26 Thermal storage cooler, 27 Bag filter, 28 Dust removal fan, 29 Dust storage silo, 30 Exhaust stack. Detailed Implementation

[0021] The following are specific implementation cases and appendices. Figure 1 The present invention will be further described below, but the present invention is not limited to these embodiments.

[0022] A calcium oxide-based synergistic desulfurization and dehydration system for dry quenching dust removal, such as Figure 1 As shown, the dry desulfurization system based on calcium in dry quenching coke includes a dust removal system and a desulfurization system 10. The dust removal system is equipped with a high-temperature dust removal pipeline 11 and a low-temperature dust removal pipeline 12, and the desulfurization system 10 is connected to the high-temperature dust removal pipeline 11. It includes a calcium oxide conveying system and a compressed air blowing pipe 16. The calcium oxide conveying system includes a calcium oxide silo 13, a rotary feeder 14, a Roots blower 15, and a calcium oxide conveying pipeline. The bottom of the calcium oxide silo 13 is equipped with a rotary feeder 14. The outlet of the rotary feeder 14 is connected to the Roots blower 15 and the calcium oxide conveying pipeline, respectively. The calcium oxide conveying pipeline is connected to the high-temperature dust removal pipeline 11 and the low-temperature dust removal pipeline 12, respectively. The compressed air blowing pipe 16 is located at the calcium oxide conveying pipeline.

[0023] By employing the above structure and adding a calcium oxide conveying system, the calcium oxide powder is moved along the calcium oxide conveying pipeline under the action of the rotary feeder 14 and the Roots blower 15, and is evenly sprayed above the high-temperature dust removal pipeline 11 and the low-temperature dust removal pipeline 12. This allows the calcium oxide powder to fully contact and react with condensate and water vapor, thereby eliminating condensate in the dust-laden gas. This prevents condensate leakage at the compensators of the high and low temperature dust removal pipelines 12 and reduces the formation of solid precipitates caused by liquid water precipitation, thus reducing pipeline blockage. Furthermore, by spraying calcium oxide powder into the high and low temperature dust removal pipelines 12 to react with condensate in the dust-laden gas, the heat released by the reaction between calcium oxide and condensate, along with the reaction products, can improve the desulfurization efficiency of the dry quenching coke-based calcium-based dry desulfurization system 10 during winter operation, thereby reducing the amount of desulfurizing agent used and improving the overall stability of the dust removal system.

[0024] Specifically, a compressed air blowing pipe 16 is added to the horizontal section of the calcium oxide conveying pipeline to prevent calcium oxide powder from clogging the calcium oxide conveying pipeline.

[0025] Specifically, the reaction of calcium oxide with water releases a large amount of heat, which can effectively increase the desulfurization reaction temperature and thus improve the desulfurization reaction efficiency. The resulting product, calcium hydroxide, is a desulfurizing agent for calcium-based dry desulfurization, which reacts directly with sulfur dioxide in dust-containing gas, alleviating the problem of increased desulfurizing agent consumption in winter.

[0026] Specifically, the dust removal system also includes a dust hood 25, a high-temperature dust removal duct 11, a low-temperature dust removal duct 12, a heat storage cooler 26, a bag filter 27, a dust removal fan 28, a dust storage bin 29, an exhaust stack 30, and a dust removal and conveying device.

[0027] Specifically, the desulfurizing agent outlet pipe in the desulfurization system 10 is connected to the high-temperature dust removal pipe 11. After the high-temperature flue gas is desulfurized, it is then mixed and exchanged with the low-temperature dust removal pipe 12 in two separate paths into the heat storage cooler 26. After the temperature reaches the allowable temperature of the bag filter 27, it flows into the bag filter 27 for dust removal and is then discharged into the atmosphere through the exhaust pipe 30.

[0028] In an embodiment of this utility model, the calcium oxide conveying pipeline includes: a conveying pipe 17, a first connecting pipe 18, and a second connecting pipe 19; the conveying pipe 17 is connected to the outlet of the rotary feeder 14; the first connecting pipe 18 is connected to the conveying pipe 17, the first connecting pipe 18 is provided with at least two first spray nozzles 20, and the first spray nozzles 20 are connected to the high-temperature dust removal pipeline 11; the second connecting pipe 19 is connected to the conveying pipe 17, the second connecting pipe 19 is provided with at least two second spray nozzles 21, and the second spray nozzles 21 are connected to the low-temperature dust removal pipeline 12.

[0029] Calcium oxide powder is conveyed into conveying pipe 17 by rotating feeder 14, and then diverted through first connecting pipe 18 and second connecting pipe 19, so that calcium oxide powder is evenly sprayed into low temperature dust removal pipe 12 and high temperature dust removal pipe 11 through first spray nozzle 20 and second spray nozzle 21, so that calcium oxide reacts with dust-containing gas, thereby effectively improving desulfurization and dewatering effects.

[0030] In the embodiments of this utility model, the distance between two adjacent first spray nozzles 20 and two adjacent second spray nozzles 21 is 20-35m.

[0031] By setting a predetermined distance between adjacent first spray nozzles 20 and second spray nozzles 21, it helps to evenly disperse calcium oxide powder in the pipeline and avoids local over- or under-dispersion.

[0032] In an embodiment of this utility model, a silencer 22 is also included; the silencer 22 is disposed at the outlet of the Roots blower 15.

[0033] By installing a silencer 22, the noise generated by the Roots blower 15 during operation is reduced.

[0034] In an embodiment of this utility model, a reducing pipe is provided at the first spray nozzle 20 and the second spray nozzle 21 respectively.

[0035] By setting up a variable diameter pipe, the contact area between calcium oxide powder and condensate is increased, resulting in a smoother airflow transition and allowing the calcium oxide powder to enter the high and low temperature dust removal pipes 12 more evenly and stably.

[0036] In an embodiment of this utility model, the compressed air blowing pipe 16 is connected to the first connecting pipe 18 and the second connecting pipe 19 respectively.

[0037] The compressed air blowing pipe 16 is connected to the first connecting pipe 18 and the second connecting pipe 19 respectively, thereby injecting compressed air to help the calcium oxide powder move forward and avoid powder accumulation or blockage.

[0038] In an embodiment of this utility model, it further includes: a first temperature measuring point 23 and a second temperature measuring point 24; the first temperature measuring point 23 is located at the outlet of the high-temperature dust removal pipe 11; the second temperature measuring point 24 is located at the outlet of the low-temperature dust removal pipe 12; both the first temperature measuring point 23 and the second temperature measuring point 24 are electrically connected to the rotary feeder 14 through a control system.

[0039] The temperature inside the high-temperature dust removal pipe 11 and the low-temperature dust removal pipe 12 is monitored in real time by the first temperature measuring point 23 and the second temperature measuring point 24. When the temperature change is detected to exceed the predetermined range, the control system automatically adjusts the switch of the rotary feeder 14 to change the supply of calcium oxide powder, thereby ensuring the desulfurization and dehydration effect.

[0040] Implementation Process: By adding a calcium oxide conveying system, calcium oxide powder is moved along the calcium oxide conveying pipeline under the action of the rotary feeder 14 and the Roots blower 15, and is evenly sprayed above the high-temperature dust removal pipeline 11 and the low-temperature dust removal pipeline 12. This allows the calcium oxide powder to fully contact and react with condensate and water vapor, thereby eliminating condensate in the dust-laden gas. This prevents condensate leakage at the compensators of the high and low temperature dust removal pipelines 12, and also reduces the formation of solid precipitates caused by liquid water precipitation, thus reducing pipeline blockage. Furthermore, by spraying calcium oxide powder into the high and low temperature dust removal pipelines 12 to react with condensate in the dust-laden gas, the heat released by the reaction between calcium oxide and condensate, along with the reaction products, can improve the desulfurization efficiency of the dry quenching coke calcium-based dry desulfurization system 10 during winter operation, thereby reducing the amount of desulfurizing agent used and improving the overall stability of the dust removal system.

[0041] In the description of this utility model, the term "multiple" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0042] In the description of this utility model, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this utility model, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A calcium oxide-based synergistic desulfurization and dehydration system for dry quenching dust removal, the system comprising a dust removal system and a desulfurization system, wherein the dust removal system is equipped with a high-temperature dust removal pipeline and a low-temperature dust removal pipeline, and the desulfurization system is connected to the high-temperature dust removal pipeline, characterized in that, include: A calcium oxide conveying system includes a calcium oxide silo, a rotary feeder, a Roots blower, and a calcium oxide conveying pipeline. The bottom of the calcium oxide silo is equipped with a rotary feeder, the outlet of which is connected to the Roots blower and the calcium oxide conveying pipeline, respectively. The calcium oxide conveying pipeline is also connected to the high-temperature dust removal pipeline and the low-temperature dust removal pipeline, respectively. A compressed air blowing pipe is installed at the calcium oxide conveying pipeline.

2. The calcium oxide-assisted desulfurization and dehydration system for dry quenching dust removal according to claim 1, characterized in that, The calcium oxide delivery pipeline includes: A conveying pipe, wherein the conveying pipe is connected to the outlet of the rotary feeder; A first connecting pipe is connected to the conveying pipe. The first connecting pipe is provided with at least two first spray nozzles, and the first spray nozzles are connected to the high-temperature dust removal pipe. The second connecting pipe is connected to the conveying pipe, and the second connecting pipe is provided with at least two second spray nozzles, which are connected to the low-temperature dust removal pipe.

3. The calcium oxide-assisted desulfurization and dehydration system for dry quenching dust removal according to claim 2, characterized in that, The distance between two adjacent first spray nozzles and two adjacent second spray nozzles is 20-35m.

4. The calcium oxide-assisted desulfurization and dehydration system for dry quenching dust removal according to claim 3, characterized in that, Also includes: A silencer is provided at the outlet of the Roots blower.

5. A calcium oxide-based synergistic desulfurization and dehydration system for dry quenching dust removal according to claim 2, characterized in that, A reducing pipe is installed at the first and second spray nozzles respectively.

6. A calcium oxide-based synergistic desulfurization and dehydration system for dry quenching dust removal according to claim 2, characterized in that, The compressed air blowing pipe is connected to the first connecting pipe and the second connecting pipe respectively.

7. The calcium oxide-assisted desulfurization and dehydration system for dry quenching dust removal according to claim 1, characterized in that, Also includes: The first temperature measuring point is located at the outlet of the high-temperature dust removal pipeline. The second temperature measuring point is located at the outlet of the low-temperature dust removal pipeline. Both the first and second temperature measuring points are electrically connected to the rotary feeder through the control system.

Images