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

Abstract

The invention provides a calcium oxide synergistic desulfurization and water removal method for dry quenching dust removal, and belongs to the technical field of dry quenching desulfurization. A calcium oxide conveying system and a compressed air blowing assisting pipe are included; 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] The present invention belongs to the technical field of dry coke quenching desulfurization, and particularly relates to a method for co - desulfurization and water removal of calcium oxide for dry coke quenching dust removal. Background Technique

[0002] With the improvement of the national requirements for flue gas emission control, dry coke quenching has gradually replaced wet coke quenching as the mainstream coke quenching technology in the current coking market, and its supporting dust removal system has also become the focus of attention. To ensure that the sulfur concentration of the discharged flue gas meets the national standards, a calcium - based dry desulfurization system is often used in the dry coke quenching dust removal system to treat the dust - containing gas. The dust - containing gas in the high - temperature and low - temperature dust removal pipelines mainly includes the flue gas generated during the charging of the top of the dry coke quenching furnace, the pressure - regulating and discharging flue gas from the pre - storage chamber at the top of the dry coke quenching, the discharging flue gas after the dry coke quenching circulating fan, and the flue gas generated during the discharging of coke at the bottom of the dry coke quenching furnace, etc.; and the dust - containing gas in the high - temperature and low - temperature dust removal pipelines contains water vapor.

[0003] However, in winter conditions, due to the decrease in outdoor temperature, the dust - containing gas undergoes a temperature drop, resulting in the precipitation of liquid water. The liquid water mixes with the dust particles to form a solid precipitate, which deposits on the lower surface of the low - temperature dust removal pipeline, reducing the cross - sectional area of the flue gas flowing through the pipeline, and condensation water leakage is likely to occur at the compensator of the high - temperature and low - temperature dust removal pipelines. Summary of the Invention

[0004] Based on the above - mentioned technical problems, the purpose of the present invention is to provide a method for co - desulfurization and water removal of calcium oxide for dry coke quenching dust removal. By adding a calcium oxide conveying system, the condensation water in the dust - containing gas is eliminated, solving the problem of condensation water leakage that easily occurs in the high - temperature and low - temperature dust removal pipelines. At the same time, the heat released by the reaction of calcium oxide with the condensation water and the reaction products can improve the desulfurization efficiency of the system.

[0005] The specific technical solution is as follows: A method for co - desulfurization and water removal of calcium oxide for dry coke quenching dust removal. The calcium - based dry desulfurization system for dry coke quenching includes a dust removal system and a desulfurization system. The dust removal system is provided 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, including: a calcium oxide conveying system and a compressed air 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 provided with a rotary feeder, and the outlet of the rotary feeder is respectively connected to the Roots blower and the calcium oxide conveying pipeline, and the calcium oxide conveying pipeline is respectively connected to the high - temperature dust removal pipeline and the low - temperature dust removal pipeline; the compressed air blowing pipe is arranged at the calcium oxide conveying pipeline; By adding a calcium oxide conveying system, under the action of a rotary feeder and a Roots blower, calcium oxide powder is evenly sprayed above the high-temperature dust removal pipeline and the low-temperature dust removal pipeline, so that the calcium oxide powder fully contacts and reacts with condensed water and water vapor, thereby achieving the purpose of eliminating condensed water in the dust-containing gas. While eliminating condensed water, the heat released by the reaction of calcium oxide and condensed water and the reaction products can improve the desulfurization efficiency of the calcium-based dry desulfurization system for coke dry quenching under winter operating conditions.

[0006] In addition, a method for calcium oxide synergistic desulfurization and water removal for coke dry quenching dust removal in the above technical solution provided by the present invention may further have the following additional technical features: 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 spraying ports, and the first spraying ports 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 spraying ports, and the second spraying ports are connected to the low-temperature dust removal pipeline.

[0007] In the above technical solution, the distance between two adjacent first spraying ports and the distance between two adjacent second spraying ports are both 25-35m.

[0008] In the above technical solution, it further includes: a muffler; the muffler is arranged at the outlet of the Roots blower.

[0009] In the above technical solution, reducing pipes are respectively arranged at the first spraying port and the second spraying port.

[0010] In the above technical solution, the compressed air assisting blowing pipes are respectively connected to the first connecting pipe and the second connecting pipe.

[0011] In the above technical solution, it further includes: a first temperature measuring point and a second temperature measuring point; the first temperature measuring point is arranged at the outlet of the high-temperature dust removal pipeline; the second temperature measuring point is arranged at the outlet of the low-temperature dust removal pipeline; the first temperature measuring point and the second temperature measuring point are both electrically connected to the rotary feeder through a control system.

[0012] The method for calcium oxide synergistic desulfurization and water removal for coke dry quenching dust removal of the present invention, compared with the prior art, has the beneficial effects as follows: 1. By adding a calcium oxide conveying system, under the action of a rotary feeder and a Roots blower, the calcium oxide powder moves along the calcium oxide conveying pipeline and is evenly sprayed above the high-temperature dust removal pipeline and the low-temperature dust removal pipeline, so that the calcium oxide powder fully contacts and reacts with the condensed water and water vapor, thereby achieving the purpose of eliminating the condensed water in the dust-containing gas, further avoiding the phenomenon of condensed water leakage at the compensators of the high- and low-temperature dust removal pipelines, and also reducing the formation of solid precipitates caused by the precipitation of liquid water, thus reducing the occurrence of pipeline blockage.

[0013] 2. Spraying the calcium oxide powder into the high- and low-temperature dust removal pipelines to react with the condensed water in the dust-containing gas. While achieving the elimination of condensed water, the heat released by the reaction of calcium oxide and condensed water and the reaction products can improve the desulfurization efficiency of the calcium-based dry desulfurization system for coke dry quenching under winter operating conditions, thereby reducing the consumption of desulfurization agents and enhancing the overall stability of the dust removal system.

[0014] 3. Add a compressed air blowing pipe on the horizontal section of the calcium oxide conveying pipeline to prevent the calcium oxide powder from blocking the calcium oxide conveying pipeline. Brief Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a method system for calcium oxide co-desulfurization and water removal for coke dry quenching dust removal according to the present invention; Among them, Figure 1 The corresponding relationship between the reference numerals in the drawings and the component names is as follows: 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 blowing pipe, 17 Conveying pipe, 18 First connecting pipe, 19 Second connecting pipe, 20 First spraying port, 21 Second spraying port, 22 Muffler, 23 First temperature measuring point, 24 Second temperature measuring point, 25 Dust removal hood, 26 Regenerative cooler, 27 Bag filter, 28 Dust removal fan, 29 Dust storage bin, 30 Exhaust stack. Detailed Embodiments

[0016] The following further illustrates the present invention in conjunction with specific implementation cases and attached Figure 1 However, the present invention is not limited to these embodiments.

[0017] A method for calcium oxide co-desulfurization and water removal for coke dry quenching dust removal, as Figure 1As shown in the figure, the calcium-based dry desulfurization system for coke dry quenching includes a dust removal system and a desulfurization system 10. The dust removal system is provided 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, including: 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. A rotary feeder 14 is provided at the bottom of the calcium oxide silo 13. The outlet of the rotary feeder 14 is respectively connected to the Roots blower 15 and the calcium oxide conveying pipeline, and the calcium oxide conveying pipeline is respectively connected to the high-temperature dust removal pipeline 11 and the low-temperature dust removal pipeline 12; the compressed air blowing pipe 16 is arranged at the calcium oxide conveying pipeline; By adding a calcium oxide conveying system, under the action of the rotary feeder 14 and the Roots blower 15, calcium oxide powder is evenly sprayed above the high-temperature dust removal pipeline 11 and the low-temperature dust removal pipeline 12, so that the calcium oxide powder fully contacts and reacts with condensed water and water vapor, thereby achieving the purpose of eliminating condensed water in the dust-containing gas. While eliminating condensed water, the heat released by the reaction of calcium oxide and condensed water and the reaction products can improve the desulfurization efficiency of the calcium-based dry desulfurization system for coke dry quenching under winter operating conditions.

[0018] With the above structure, by adding a calcium oxide conveying system, under the action of the rotary feeder 14 and the Roots blower 15, calcium oxide powder moves along the calcium oxide conveying pipeline and is evenly sprayed above the high-temperature dust removal pipeline 11 and the low-temperature dust removal pipeline 12, so that the calcium oxide powder fully contacts and reacts with condensed water and water vapor, thereby achieving the purpose of eliminating condensed water in the dust-containing gas. Furthermore, it avoids the phenomenon of condensed water leakage at the compensator of the high- and low-temperature dust removal pipelines 12, and also realizes the reduction of the formation of solid precipitates caused by the precipitation of liquid water, thereby reducing the occurrence of pipeline blockage. And by spraying calcium oxide powder into the high- and low-temperature dust removal pipelines 12 to react with the condensed water in the dust-containing gas, while eliminating condensed water, the heat released by the reaction of calcium oxide and condensed water and the reaction products can improve the desulfurization efficiency of the calcium-based dry desulfurization system 10 under winter operating conditions, thereby reducing the consumption of desulfurization agents and enhancing the overall stability of the dust removal system.

[0019] Specifically, a compressed air blowing pipe 16 is added to the horizontal section of the calcium oxide conveying pipeline to avoid blockage of the calcium oxide conveying pipeline by calcium oxide powder.

[0020] Specifically, a large amount of heat is released during the reaction of calcium oxide with water. The heat generated by the reaction can effectively increase the desulfurization reaction temperature, thereby improving the desulfurization reaction efficiency. And the generated product calcium hydroxide is a desulfurization agent for calcium-based dry desulfurization, which directly reacts with sulfur dioxide in the dust-containing gas, and can alleviate the problem of increased consumption of desulfurization agents under winter conditions.

[0021] Specifically, the dust removal system further includes a dust hood 25, a high-temperature dust removal pipeline 11, a low-temperature dust removal pipeline 12, a regenerative cooler 26, a bag filter 27, a dust removal fan 28, a dust storage bin 29, an exhaust stack 30, and a dust cleaning and ash conveying device.

[0022] Specifically, the desulfurizer outlet pipeline in the desulfurization system 10 is connected to the high-temperature dust removal pipeline 11. After the high-temperature flue gas is desulfurized, it enters the regenerative cooler 26 in two paths together with the low-temperature dust removal pipeline 12 for mixed heat exchange, and then flows into the bag filter 27 for dust removal after the temperature reaches the allowable temperature of the bag filter 27, and is finally discharged to the atmosphere through the exhaust stack 30.

[0023] In an embodiment of the present invention, 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 communicated with the outlet of the rotary feeder 14; the first connecting pipe 18 is communicated with the conveying pipe 17, and at least two first spraying ports 20 are provided on the first connecting pipe 18, and the first spraying ports 20 are communicated with the high-temperature dust removal pipeline 11; the second connecting pipe 19 is communicated with the conveying pipe 17, and at least two second spraying ports 21 are provided on the second connecting pipe 19, and the second spraying ports 21 are communicated with the low-temperature dust removal pipeline 12.

[0024] The calcium oxide powder is conveyed into the conveying pipe 17 through the rotary feeder 14, and is branched through the first connecting pipe 18 and the second connecting pipe 19, so that the calcium oxide powder is evenly sprayed into the low-temperature dust removal pipeline 12 and the high-temperature dust removal pipeline 11 through the first spraying ports 20 and the second spraying ports 21, and the calcium oxide reacts with the dust-containing gas, thereby effectively improving the desulfurization effect and the water removal effect.

[0025] In an embodiment of the present invention, the distance between two adjacent first spraying ports 20 and the distance between two adjacent second spraying ports 21 are both 20 - 35 m.

[0026] By providing a predetermined distance between adjacent first spraying ports 20 and second spraying ports 21, it helps the calcium oxide powder to be evenly dispersed in the pipeline, and avoids the situation of local excess or deficiency.

[0027] In an embodiment of the present invention, it further includes: a muffler 22; the muffler 22 is arranged at the outlet of the Roots blower 15.

[0028] By providing the muffler 22, the noise generated by the Roots blower 15 during operation is reduced.

[0029] In an embodiment of the present invention, reducing pipes are respectively arranged at the first spraying ports 20 and the second spraying ports 21.

[0030] By setting a reducing pipe, the contact area between calcium oxide powder and condensed water is increased, a smoother air flow transition is achieved, and the calcium oxide powder enters the high- and low-temperature dust removal pipes 12 more evenly and stably.

[0031] In an embodiment of the present invention, the compressed air blowing pipe 16 is respectively communicated with the first connecting pipe 18 and the second connecting pipe 19.

[0032] By connecting the compressed air blowing pipe 16 to the first connecting pipe 18 and the second connecting pipe 19 respectively, compressed air is injected to help the calcium oxide powder move forward, avoiding powder accumulation or blockage.

[0033] In an embodiment of the present invention, it further includes: a first temperature measuring point 23 and a second temperature measuring point 24; the first temperature measuring point 23 is arranged at the outlet of the high-temperature dust removal pipe 11; the second temperature measuring point 24 is arranged 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.

[0034] The temperatures in the high-temperature dust removal pipe 11 and the low-temperature dust removal pipe 12 are monitored in real time through the first temperature measuring point 23 and the second temperature measuring point 24. When the detected temperature change exceeds a predetermined range, the control system automatically adjusts the switch of the rotary feeder 14, thereby changing the supply amount of the calcium oxide powder, and further ensuring the desulfurization and water removal effects.

[0035] In the description of the present invention, the term "a plurality of" means two or more, unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention; terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the description of the present invention, the description of terms such as "an embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0037] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for calcium oxide coordinated desulfurization and water removal for dry coke quenching dust removal, wherein the dry coke quenching calcium-based dry desulfurization system comprises a dust removal system and a desulfurization system, wherein the dust removal system is provided 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, the calcium oxide conveying system comprising a calcium oxide silo, a rotary feeder, a Roots blower and a calcium oxide conveying pipeline, a rotary feeder is provided at the bottom of the calcium oxide silo, an outlet of the rotary feeder is respectively connected to the Roots blower and the calcium oxide conveying pipeline, and the calcium oxide conveying pipeline is respectively connected to the high-temperature dust removal pipeline and the low-temperature dust removal pipeline; A compressed air blowing-assisting pipe, wherein the compressed air blowing-assisting pipe is arranged at the calcium oxide conveying pipeline; By adding a calcium oxide conveying system, the calcium oxide powder is evenly sprayed above the high-temperature dust removal pipe and the low-temperature dust removal pipe under the action of a rotary feeder and a Roots blower, so that the calcium oxide powder is fully contacted and reacted with condensed water and water vapor, thereby achieving the purpose of eliminating condensed water in the dust-containing gas. While eliminating the condensed water, the heat and reaction products released by the reaction of calcium oxide and condensed water can improve the desulfurization efficiency of the dry quenching calcium-based dry desulfurization system during winter operation conditions.

2. The method for calcium oxide coordinated desulfurization and water removal for dry coke quenching and dust removal according to claim 1, characterized in that: The calcium oxide delivery pipeline comprises: A delivery pipe, the delivery pipe is connected to the outlet of the rotary feeder; A first connecting pipe, the first connecting pipe is connected to the conveying pipe, the first connecting pipe is provided with at least two first spraying ports, and the first spraying ports are connected to the high-temperature dust removal pipeline; A second connecting pipe, wherein the second connecting pipe is connected to the conveying pipe, the second connecting pipe is provided with at least two second spraying ports, and the second spraying ports are connected to the low-temperature dust removal pipeline.

3. The method for calcium oxide coordinated desulfurization and water removal for dry coke quenching and dust removal according to claim 2, characterized in that: The distance between two adjacent first spraying ports and the distance between two adjacent second spraying ports are 20-35 m.

4. The method for calcium oxide coordinated desulfurization and water removal for dry coke quenching and dust removal according to claim 3, characterized in that: Also includes: A muffler is arranged at the outlet of the Roots blower.

5. The method for calcium oxide coordinated desulfurization and water removal for dry coke quenching and dust removal according to claim 2, characterized in that: The first spray port and the second spray port are respectively provided with a reducing pipe.

6. The method for calcium oxide coordinated desulfurization and water removal for dry coke quenching and dust removal according to claim 2, characterized in that: The compressed air blowing-assisting pipe is communicated with the first connecting pipe and the second connecting pipe respectively.

7. The method for calcium oxide coordinated desulfurization and water removal for dry coke quenching and dust removal according to claim 1, characterized in that: Also includes: A first temperature measuring point, wherein the first temperature measuring point is arranged at the outlet of the high-temperature dust removal pipeline; A second temperature measuring point, wherein the second temperature measuring point is arranged at the outlet of the low-temperature dust removal pipeline; The first temperature measuring point and the second temperature measuring point are both electrically connected to the rotary feeder through a control system.

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