Method for increasing temperature of dry quenching calcium-based dry desulfurization agent

Abstract

The invention provides a method for increasing the temperature of a dry quenching calcium-based dry desulfurization agent, which belongs to the technical field of dry quenching desulfurization and comprises a dust removal system, a desulfurization system and a desulfurization agent heating system, a desulfurizing agent in the desulfurizing bin enters the desulfurizing agent pipeline through the rotary feeder, and the desulfurizing agent is pushed to move through the operation of the Roots blower; the electric tracing band is wound on the outer wall of the desulfurizing agent pipeline to ensure that the temperature of the desulfurizing agent can also be ensured under the condition of lower environment temperature, and the heat exchanger is arranged between the high-temperature dust removal pipeline and the outlet of the desulfurizing agent pipeline, so that waste heat in low-pressure steam is utilized to heat the desulfurizing agent through the heat exchanger; the compressed air pipeline provides extra power to push the desulfurizing agent to move; according to the system, when the calcium-based dry desulfurization system is under the working condition in winter, the purposes of enhancing the desulfurization effect, reducing the content of a desulfurizing agent and reducing the operation and maintenance cost are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of dry coke quenching desulfurization, and in particular relates to a method for increasing the temperature of a dry coke quenching calcium-based dry desulfurization agent. Background Art

[0002] In the patent application with application number 202120144486.1, a dry quenching flue gas desulfurization device is proposed. The system is a fully dry system that does not require water, does not generate wastewater, has low energy consumption, and is highly flexible. The amount of desulfurizer sprayed can be adjusted according to actual conditions to adapt to emission indicators required by environmental protection. It also has strong adaptability to factory operating conditions and has good and appropriate adjustment characteristics when adjusting production load.

[0003] At present, in order to ensure that the sulfur concentration of the exhaust flue gas meets national standards, the dry coke quenching dust removal system often uses a calcium-based dry desulfurization system to treat dusty gases. When the calcium-based dry desulfurization system is operated in winter conditions, the outdoor temperature drops significantly, the heat exchange temperature difference between the high-temperature flue gas and the outside air increases, and the heat loss increases, causing the high-temperature flue gas temperature to be far lower than the design temperature. Therefore, the desulfurizer content required to achieve the designed desulfurization effect is much higher than the design value, which leads to an increase in operating costs. Summary of the invention

[0004] Based on the above technical problems, the present invention provides a method for increasing the temperature of dry coke quenching calcium-based dry desulfurization agent. The system enables the calcium-based dry desulfurization system to achieve the purpose of enhancing the desulfurization effect while reducing the content of desulfurization agent and reducing the cost of operation and maintenance under winter conditions.

[0005] The specific technical solution is: A method for increasing the temperature of a dry coke quenching calcium-based dry desulfurizer, comprising: a dust removal system, a desulfurization system and a desulfurizer heating system; the dust removal system comprises a dust removal hood, a low-temperature dust removal pipeline, a high-temperature dust removal pipeline, a heat storage cooler, a bag dust collector, a dust removal fan and an exhaust pipe, the dust removal fan extracts the low-temperature flue gas and the high-temperature flue gas discharged from the dry coke quenching body through the low-temperature dust removal pipeline and the high-temperature dust removal pipeline respectively, and enters the heat storage cooler for heat exchange respectively, and the flue gas after heat exchange enters the bag dust collector for dust removal and is discharged through the exhaust pipe; the desulfurization system comprises a desulfurization bin, a Roots blower and a desulfurizer pipeline, a rotary feeder is provided at the bottom of the desulfurization bin, and the desulfurizer in the desulfurization bin enters the desulfurization bin through the rotary feeder The desulfurizer pipeline is connected to the desulfurizer pipeline and is operated by a Roots blower to push the desulfurizer to move; the desulfurizer heating system includes an electric heating tape, a heat exchanger and a compressed air pipeline. The electric heating tape is wound around the outer wall of the desulfurizer pipeline to ensure that the temperature of the desulfurizer can be maintained even when the ambient temperature is low. The heat exchanger is arranged between the high-temperature dust removal pipeline and the outlet of the desulfurizer pipeline, so that the waste heat in the low-pressure steam is used to heat the desulfurizer through the heat exchanger, and additional power is provided through the compressed air pipeline to push the desulfurizer to move; the heat exchanger is arranged between the high-temperature dust removal pipeline and the outlet of the desulfurizer pipeline, so that the waste heat in the low-pressure steam is used to heat the desulfurizer through the heat exchanger, thereby increasing the temperature of the desulfurizer and the activity of the desulfurizer.

[0006] In addition, a method for increasing the temperature of a dry-quenching calcium-based dry desulfurization agent in the above technical solution provided by the present invention may also have the following additional technical features: In the above technical solution, a heat exchange tube is provided in the heat exchanger, the air inlet end of the heat exchange tube is connected to the low-pressure steam pipeline, and the air outlet end of the heat exchange tube is connected to the hot water heating pipeline.

[0007] The above technical scheme also includes: a silo pump, a pneumatic conveying pipeline, an ash silo and a humidifier; the silo pump is arranged at the discharge port of the bag dust collector; the input end of the pneumatic conveying pipeline is connected to the silo pump; the ash silo is connected to the output end of the pneumatic conveying pipeline; the input end of the humidifier is connected to the discharge port of the ash silo, and the output end of the humidifier is connected to the dump truck.

[0008] In the above technical solution, a belt conveyor is provided at the discharge port of the CDQ body, and a dust removal hood is arranged above the belt conveyor.

[0009] The above technical solution also includes: a first compressed air storage tank and a second compressed air storage tank; the first compressed air storage tank is connected to the bag dust collector; the second compressed air storage tank is connected to the pneumatic conveying pipeline.

[0010] Compared with the prior art, the method of increasing the temperature of the dry quenching calcium-based dry desulfurization agent of the present invention has the following beneficial effects: 1. By setting a heat exchanger between the high-temperature dust removal pipeline and the outlet of the desulfurizer pipeline, and using the waste heat in the low-pressure steam to heat the desulfurizer through the heat exchanger, the temperature of the desulfurizer can be increased, which helps to enhance the activity of the desulfurizer and thus enhance the desulfurization effect. At the same time, the electric heating belt ensures that even under low ambient temperature, the temperature of the desulfurizer can be maintained, ensuring its fluidity and preventing blockage.

[0011] 2. As the temperature rises, the molecular kinetic energy of the desulfurizer increases, which makes the intermolecular force relatively weakened, thereby reducing the viscosity of the substance and preventing the desulfurizer from condensing or accumulating into blocks in the pipeline, causing blockage. While reducing the usage, it also reduces the cleaning and maintenance costs.

[0012] 3. By adding a compressed air pipeline to the desulfurizer pipeline, compressed air is used to provide additional power to push the desulfurizer to move, ensuring the smooth movement of the desulfurizer and avoiding the desulfurizer from clogging the pipeline. At the same time, the desulfurizer is fully in contact with the pipeline to improve the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A flow chart of a method for increasing the temperature of a dry coke quenching calcium-based dry desulfurization agent according to the present invention; Figure 2 for Figure 1 A local enlarged view of point A; in, Figure 1 to Figure 2 The corresponding relationship between the reference numerals and component names in the figure is: 10 dust hood, 11 low-temperature dust removal pipeline, 12 high-temperature dust removal pipeline, 13 heat storage cooler, 14 bag dust collector, 15 dust removal fan, 16 exhaust pipe, 17 desulfurization bin, 18 Roots blower, 19 desulfurization agent pipeline, 20 heat exchanger, 21 compressed air pipeline, 22 heat exchange tube, 23 low-pressure steam pipeline, 24 hot water heating pipeline, 25 silo pump, 26 pneumatic conveying pipeline, 27 ash silo, 28 humidifier, 29 dump truck, 30 dry quenching body, 31 belt conveyor, 32 first compressed air storage tank, 33 second compressed air storage tank. DETAILED DESCRIPTION

[0014] The following is a combination of specific implementation cases and attached Figure 1-2 The present invention is further described below, but the present invention is not limited to these embodiments.

[0015] A method for increasing the temperature of a dry coke quenching calcium-based dry desulfurization agent, such as Figure 1-2As shown, it includes: a dust removal system and a compressed air pipeline desulfurization agent heating system; the dust removal system includes a dust removal hood 10, a low-temperature dust removal pipeline 11, a high-temperature dust removal pipeline 12, a heat storage cooler 13, a bag dust collector 14, a dust removal fan 15 and an exhaust pipe 16. The dust removal fan 15 extracts the low-temperature flue gas and the high-temperature flue gas discharged from the dry quenching coke body 30 through the low-temperature dust removal pipeline 11 and the high-temperature dust removal pipeline 12 respectively, and enters the heat storage cooler 13 for heat exchange respectively. After the heat exchange, the flue gas enters the bag dust collector 14 for dust removal and is discharged through the exhaust pipe 16; the desulfurization system includes a desulfurization bin 17, a Roots blower 18 and a desulfurization agent pipeline 19. A rotary feeder is provided at the bottom of the desulfurization bin 17. The desulfurization agent in the desulfurization bin 17 enters the desulfurization bin through the rotary feeder. The desulfurizer pipeline 19 is connected to the desulfurizer pipeline 19, and is operated by the Roots blower 18 to push the desulfurizer to move; the desulfurizer heating system includes an electric heating tape, a heat exchanger 20 and a compressed air pipeline 21. The electric heating tape is wound around the outer wall of the desulfurizer pipeline 19 to ensure that the temperature of the desulfurizer can be maintained even when the ambient temperature is low. The heat exchanger 20 is arranged between the high-temperature dust removal pipeline 12 and the outlet of the desulfurizer pipeline 19, and the waste heat in the low-pressure steam is used to heat the desulfurizer through the heat exchanger, and the compressed air pipeline 21 provides additional power to push the desulfurizer to move; the heat exchanger 20 is arranged between the high-temperature dust removal pipeline 12 and the outlet of the desulfurizer pipeline 19, and the waste heat in the low-pressure steam is used to heat the desulfurizer through the heat exchanger, thereby increasing the temperature of the desulfurizer and the activity of the desulfurizer.

[0016] By adopting the above technical solution, a heat exchanger 20 is set between the high-temperature dust removal pipeline 12 and the outlet of the desulfurizer pipeline 19, and the waste heat in the low-pressure steam is used to heat the desulfurizer through the heat exchanger, which can increase the temperature of the desulfurizer, help to enhance the activity of the desulfurizer, and thus enhance the desulfurization effect. At the same time, the electric heating belt ensures that even under low ambient temperature, the temperature of the desulfurizer can be guaranteed, ensuring its fluidity and preventing blockage. As the temperature rises, the molecular kinetic energy of the desulfurizer increases, so that the intermolecular force is relatively weakened, thereby reducing the viscosity of the substance and preventing the desulfurizer from condensing or accumulating into blocks in the pipeline, causing blockage. While reducing the usage, it also reduces the cleaning and maintenance costs. By adding a compressed air pipeline 21 to the desulfurizer pipeline 19, compressed air is used to provide additional power to drive the desulfurizer to move, ensuring that the desulfurizer moves smoothly, avoiding the desulfurizer from clogging the pipeline, and making the desulfurizer fully contact with the pipeline to improve the heat exchange efficiency.

[0017] Specifically, the dust removal fan 15 provides power for the system, so that the flue gas of the dry quenching body 30 enters the heat storage cooler 13 through the low-temperature dust removal pipeline 11 and the high-temperature dust removal pipeline 12 respectively, and then enters the bag dust collector 14 for dust removal after heat exchange in the heat storage cooler 13. The flue gas after dust removal is discharged through the exhaust pipe 16; since the effective working temperature range of the desulfurizer is between 150°C and 300°C, a heat exchanger 20 is added between the desulfurizer pipeline 19 and the high-temperature dust removal pipeline 12 to increase the temperature of the desulfurizer, thereby improving the desulfurization effect of the desulfurizer on the high-temperature flue gas, and the high-temperature flue gas after desulfurization enters the heat storage cooler 13 for heat exchange.

[0018] In an embodiment of the present invention, Figure 1-2 As shown, a heat exchange tube 22 is provided in the heat exchanger 20 , an air inlet end of the heat exchange tube 22 is connected to a low-pressure steam pipeline 23 , and an air outlet end of the heat exchange tube 22 is connected to a hot water heating pipeline 24 .

[0019] Specifically, the heat exchanger 20 has a total of 4 cold and hot source connection holes, wherein the cold source is a desulfurizer, and the heat source is low-pressure steam. The cold source inlet is arranged at the top of the heat exchanger 20, and the outlet of the desulfurizer pipeline 19 is connected to the cold source inlet. The cold source outlet is arranged on the lower surface of the heat exchanger 20, and the cold source outlet is connected to the high-temperature dust removal pipeline 12. The heat source inlet is arranged at the air inlet end of the heat exchange tube 22, and the heat source inlet is connected to the low-pressure steam pipeline 23. The heat source outlet is arranged at the air outlet end of the heat exchange tube 22, and the heat source outlet is connected to the hot water heating pipeline 24.

[0020] In an embodiment of the present invention, Figure 1-2 As shown, it also includes: a silo pump 25, a pneumatic conveying pipeline 26, an ash silo 27 and a humidifier 28; the silo pump 25 is arranged at the discharge port of the bag dust collector 14; the input end of the pneumatic conveying pipeline 26 is connected to the silo pump 25; the ash silo 27 is connected to the output end of the pneumatic conveying pipeline 26; the input end of the humidifier 28 is connected to the discharge port of the ash silo 27, and the output end of the humidifier 28 is connected to the dump truck 29.

[0021] The dust discharged from the bag filter 14 enters the ash bin 27 through the bin pump 25 and the pneumatic conveying pipe 26, and is humidified by the humidifier 28. The humidified dust falls on the dump truck 29 for transportation.

[0022] In the embodiment of the present invention, a belt conveyor 31 is provided at the discharge port of the CDQ body 30 , and the dust removal hood 10 is arranged above the belt conveyor 31 .

[0023] By combining the belt conveyor 31 and the dust hood 10, the smoke and materials discharged from the discharge port of the CDQ body 30 fall on the belt conveyor 31, and the dust hood 10 extracts the smoke discharged from the discharge port for dust removal.

[0024] In an embodiment of the present invention, Figure 1-2 As shown, it also includes: a first compressed air storage tank 32 and a second compressed air storage tank 33; the first compressed air storage tank 32 is connected to the bag dust collector 14; the second compressed air storage tank 33 is connected to the pneumatic conveying pipeline 26.

[0025] The first compressed air storage tank 32 is used to clean the bags in the bag filter 14 , and the second compressed air storage tank 33 is used to provide power for the dust in the pneumatic conveying pipeline 26 .

[0026] In the description of the present invention, the term "plurality" refers to two or more than two. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. The terms "connection", "installation", "fixation", etc. should 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 ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the description of the present invention, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0028] The above description is only a preferred embodiment of the present invention and is 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 in the protection scope of the present invention.

Claims

1. A method for increasing the temperature of a dry coke quenching calcium-based dry desulfurization agent, characterized in that: include: A dust removal system, the dust removal system comprising a dust removal hood, a low-temperature dust removal pipeline, a high-temperature dust removal pipeline, a heat storage cooler, a bag dust collector, a dust removal fan and an exhaust pipe. The dust removal fan extracts the low-temperature flue gas and the high-temperature flue gas discharged from the dry coke quenching body through the low-temperature dust removal pipeline and the high-temperature dust removal pipeline respectively, and respectively enters the heat storage cooler for heat exchange. After the heat exchange, the flue gas enters the bag dust collector for dust removal and is discharged through the exhaust pipe; A desulfurization system, the desulfurization system comprises a desulfurization bin, a Roots blower and a desulfurizer pipeline. A rotary feeder is provided at the bottom of the desulfurization bin. The desulfurizer in the desulfurization bin enters the desulfurizer pipeline through the rotary feeder and is driven to move by the Roots blower. A desulfurizer heating system, the desulfurizer heating system includes an electric heating tape, a heat exchanger and a compressed air pipeline. The electric heating tape is wound around the outer wall of the desulfurizer pipeline to ensure that the temperature of the desulfurizer can be maintained even when the ambient temperature is low. The heat exchanger is arranged between the high-temperature dust removal pipeline and the outlet of the desulfurizer pipeline, so that the waste heat in the low-pressure steam is used to heat the desulfurizer through the heat exchanger, and additional power is provided through the compressed air pipeline to drive the desulfurizer to move; By setting a heat exchanger between the high-temperature dust removal pipeline and the outlet of the desulfurizer pipeline, the waste heat in the low-pressure steam is used to heat the desulfurizer through the heat exchanger, thereby increasing the temperature of the desulfurizer and the activity of the desulfurizer.

2. A method for increasing the temperature of a dry coke quenching calcium-based dry desulfurization agent according to claim 1, characterized in that: The heat exchanger is provided with a heat exchange tube, the air inlet end of the heat exchange tube is connected to the low-pressure steam pipeline, and the air outlet end of the heat exchange tube is connected to the hot water heating pipeline.

3. A method for increasing the temperature of a dry coke quenching calcium-based dry desulfurization agent according to claim 2, characterized in that: Also includes: A silo pump, the silo pump being arranged at the discharge port of the bag filter; A pneumatic conveying pipeline, the input end of which is connected to the silo pump; An ash bin, the ash bin being connected to the output end of the pneumatic conveying pipeline; A humidifier, wherein the input end of the humidifier is connected to the discharge port of the ash bin, and the output end of the humidifier is connected to the dump truck.

4. The method for increasing the temperature of dry quenching calcium-based dry desulfurization agent according to claim 3, characterized in that: A belt conveyor is provided at the discharge port of the dry coke quenching body, and the dust removal cover is arranged above the belt conveyor.

5. A method for increasing the temperature of a dry coke quenching calcium-based dry desulfurization agent according to claim 4, characterized in that: Also includes; a first compressed air storage tank, wherein the first compressed air storage tank is connected to the bag filter; A second compressed air storage tank is connected to the pneumatic conveying pipeline.

Images