A dry quenching coke treatment system

Abstract

This invention provides a dry quenching coke treatment system, relating to the technical field of coke production equipment. The dry quenching coke treatment system includes: a dry quenching furnace for cooling high-temperature coke via gas heat exchange, and a waste heat boiler for producing steam using the high-temperature gas produced by the dry quenching furnace; it is equipped with a gas output pipeline and a gas input pipeline connecting the dry quenching furnace and the waste heat boiler; the gas output pipeline is used to supply gas to the waste heat boiler; the gas input pipeline is used to supply gas to the dry quenching furnace. A circulating fan and a heat pipe heat exchanger are installed on the gas input pipeline; a flue gas extraction port is installed on the pipeline between the circulating fan and the heat pipe heat exchanger, and the flue gas extraction port is connected to a desulfurization treatment system through a sealed flue gas emission pipeline. This invention can improve the flue gas desulfurization effect of the system and enhance the overall environmental friendliness of the system's production.

Description

Technical Field

[0001] This utility model relates to the technical field of coke production equipment, specifically a dry quenching coke treatment system. Background Technology

[0002] The working principle of a heat recovery coke oven is as follows: coking coal is compacted and loaded into the carbonization chamber. The heat stored in the main wall, bottom, and top of the carbonization chamber, as well as heat transferred from adjacent carbonization chambers, heats and decomposes the coking coal, producing raw coal gas. During its escape, the raw coal gas forms a protective gas layer on the surface of the coal bed. It then undergoes incomplete combustion with externally introduced air, generating another protective gas layer. This allows the coal (coke) bed to be heated in the absence of air to produce coke. Dry quenching technology utilizes cooling gas, which exchanges heat with the incandescent red-hot coke in the dry quenching furnace, thereby cooling the coke. The gas that has absorbed the heat from the red-hot coke transfers the heat to the dry quenching boiler to generate steam. The cooled gas is then returned to the dry quenching furnace by a circulating fan for reuse. The coke produced by the heat recovery coke oven is fed into the coke jar of the dry quenching unit through the coke conveying system. After the coke jar seals the red coke, it is lifted to the top of the dry quenching furnace. The red coke is then unloaded into the cooling chamber of the dry quenching furnace by a rotating feeder. The cooled coke is discharged through a vibrating feeder and a sealed valve and enters the coke storage and transportation system.

[0003] However, the circulating cooling gas contains flue gas. Since the flue gas has a high sulfur concentration, it needs to be sent to the desulfurization and denitrification system for treatment. In the current design, the desulfurization and denitrification system draws the flue gas from the pipeline between the heat pipe heat exchanger and the dry quenching furnace, and then treats the sulfur dioxide with calcium. However, this method has poor desulfurization effect, which increases the difficulty of environmental protection management. Utility Model Content

[0004] This invention addresses the problem in existing desulfurization and denitrification systems that draw flue gas from the pipe between the heat pipe heat exchanger and the dry quenching furnace and treat sulfur dioxide with calcium, resulting in poor desulfurization and increased difficulty in environmental management. It provides a dry quenching coke treatment system that improves the flue gas desulfurization effect and enhances the overall environmental friendliness of the system.

[0005] The technical solution adopted in this utility model is:

[0006] A dry quenching system, comprising:

[0007] Dry quenching furnace, used for gas heat exchange to cool high-temperature coke;

[0008] Waste heat boiler, used to produce steam from the high-temperature gas produced by the dry quenching furnace;

[0009] A gas output pipeline connects the dry quenching furnace and the waste heat boiler; the gas output pipeline is used to supply gas to the waste heat boiler.

[0010] A gas input pipeline connects the dry quenching furnace and the waste heat boiler; the gas input pipeline is used to supply gas to the dry quenching furnace.

[0011] The gas input pipeline is equipped with a circulating fan and a heat pipe heat exchanger; a flue gas extraction port is provided on the pipeline between the circulating fan and the heat pipe heat exchanger, and the flue gas extraction port is connected to the desulfurization treatment system through a sealed flue gas emission pipeline.

[0012] Furthermore, the dry quenching furnace is equipped with a coke storage tank and a coke cooling chamber; the top of the coke storage tank is equipped with a coke inlet; and the bottom of the coke cooling chamber is equipped with a coke outlet.

[0013] Furthermore, a vibrating feeder and a transport pipeline are provided at the coke output port.

[0014] Furthermore, a rotary sealing valve is installed on the transport pipeline.

[0015] Furthermore, a primary dust collector is installed on the gas output pipeline.

[0016] Furthermore, the primary dust collector is equipped with a venting device; when the pressure inside the primary dust collector exceeds a set value, the pressure sensor in the venting device can detect the signal and control the venting valve to open, so that the gas inside the primary dust collector can be discharged.

[0017] Furthermore, a secondary dust collector is installed on the gas input pipeline, specifically at the end connecting the waste heat boiler and the circulating fan.

[0018] Furthermore, the flue gas emission pipeline is provided with a first branch pipe and a second branch pipe; the first branch pipe is connected to the environmental ground dust removal system and is equipped with a dust suction hood; the second branch pipe is connected to an air discharge port.

[0019] Furthermore, a first butterfly valve is installed on the main pipeline connecting the flue gas emission pipeline to the desulfurization treatment system; a second butterfly valve is installed on the first branch pipe; and a third butterfly valve is installed on the second branch pipe.

[0020] Furthermore, a first electric gate valve is installed on the gas input pipeline at the end connected to the waste heat boiler; a second electric gate valve is installed on the gas input pipeline at the outlet end of the heat pipe heat exchanger.

[0021] The beneficial effects of this utility model are:

[0022] 1. This utility model, by setting up a gas circulation channel composed of a dry quenching furnace, a gas output pipeline, a waste heat boiler, and a gas input pipeline, enables the gas used for cooling coke in the dry quenching furnace to be recycled, and the heat of the gas is recovered through the waste heat boiler. Furthermore, in conjunction with the flue gas extraction port between the circulating fan and the heat pipe heat exchanger on the gas input pipeline and the sealed flue gas emission pipeline, flue gas with a more suitable reaction temperature is input into the desulfurization system, avoiding the entry of external cold air. This improves desulfurization efficiency and effect, solving the problem in existing desulfurization and denitrification systems where flue gas is drawn from the pipeline between the heat pipe heat exchanger and the dry quenching furnace, and desulfurization is poorly achieved through calcium-based treatment of sulfur dioxide, leading to increased difficulty in environmental management. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the processing system according to an embodiment of the present invention;

[0025] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 This utility model Figure 1 Enlarged view of point B in the middle;

[0027] Figure 4 This utility model Figure 1 A magnified view of point C in the middle.

[0028] Attached reference numerals: 100-Dry quenching furnace, 110-Coke storage tank, 112-Coke inlet, 114-Air intake pipe, 120-Coke cooling chamber, 122-Coke outlet, 124-Vibrating feeder, 126-Transportation pipeline, 128-Rotary sealing valve;

[0029] 200 - Gas output pipeline; 210 - Primary dust collector; 212 - Venting device;

[0030] 300- Waste heat boiler;

[0031] 400 - Gas input pipeline, 401 - First electric slide gate valve, 402 - Second electric slide gate valve, 410 - Circulating fan, 420 - Secondary dust collector, 430 - Flue gas extraction port, 440 - Heat pipe heat exchanger, 450 - Flue gas discharge pipeline, 454 - First butterfly valve, 460 - First branch pipe, 462 - Dust hood, 464 - Second butterfly valve, 470 - Second branch pipe, 472 - Air discharge port, 474 - Third butterfly valve;

[0032] 500-Desulfurization treatment system;

[0033] 600 - Environmental ground dust removal system. Detailed Implementation

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are 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 are not intended to 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.

[0035] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0036] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0037] Example 1

[0038] The existing dry quenching system uses circulating cooling gas containing flue gas. Due to the high sulfur concentration in the flue gas, it needs to be sent to the desulfurization and denitrification system for treatment. In the current design, the desulfurization and denitrification system draws the flue gas from the pipeline between the heat pipe heat exchanger and the dry quenching furnace, and then treats the sulfur dioxide with calcium-based treatment. However, this method has poor desulfurization effect. The design value for sulfur dioxide in flue gas is generally 850 mg / m³, and the limit value is 1000 mg / m³. However, the current desulfurization method often fails to meet this standard, requiring further treatment through other methods, which increases the difficulty of environmental protection management.

[0039] To address the aforementioned problems in the prior art, this embodiment provides a dry quenching system for cooling red-hot coke produced in heat recovery coke ovens and reusing the generated heat. This dry quenching system can improve the flue gas desulfurization effect and enhance the overall environmental friendliness of the system's production. Please refer to... Figures 1-4 The dry quenching coke treatment system mainly includes: a dry quenching furnace 100, a gas output pipeline 200, a waste heat boiler 300, and a gas input pipeline 400, etc.

[0040] The dry quenching furnace 100 is used to receive red-hot coke produced by the heat recovery coke oven and to exchange heat between the gas and the red-hot coke, thereby cooling the coke for storage. For example... Figure 1 As shown, the dry quenching furnace 100 mainly includes an upper coke storage tank 110 and a lower coke cooling chamber 120. The top of the coke storage tank 110 has a coke inlet 112, which connects to the output port of the heat recovery coke oven, used to temporarily store high-temperature red-hot coke. A rotary distributor is installed between the coke storage tank 110 and the coke cooling chamber 120. The rotary distributor unloads the high-temperature coke from the coke storage tank 110 into the coke cooling chamber 120. In the coke cooling chamber 120, a lower-temperature circulating gas is continuously introduced to exchange heat with the coke, cooling it. The cooled coke is then discharged from the coke outlet 122 at the bottom of the coke cooling chamber 120 and transported by a conveyor to a coke buffer area for storage.

[0041] The gas output pipeline 200 is kept under negative pressure to guide the high-temperature gas in the upper part of the dry quenching furnace 100 into the waste heat boiler 300. One end of the gas output pipeline 200 is connected to the high-temperature gas outlet in the upper part of the dry quenching furnace 100, and the other end is connected to the high-temperature gas inlet in the upper part of the waste heat boiler 300.

[0042] The waste heat boiler 300 is used to heat steam generated in the high-temperature gas inside the dry quenching furnace 100, which can be used for power generation and heating. In this embodiment, the high-temperature gas inlet at the top of the waste heat boiler 300 is connected to the gas output pipeline 200; the cooled gas outlet at the bottom of the waste heat boiler 300 is connected to the gas input pipeline 400. The waste heat boiler 300 mainly consists of a flue, tube bundle, kettle, etc. The upper part is equipped with water-cooled walls, superheaters, and evaporators, etc., and is supported by supports at the bottom of the water-cooled walls. The lower part consists of an economizer and wall panels, adopting a bottom support structure. Due to the difference in expansion between the upper and lower parts, a transition flue and expansion joint are used to connect them.

[0043] The gas input pipeline 400 is kept under positive pressure to guide the cooled gas from the waste heat boiler 300 back into the dry quenching furnace for recycling. One end of the gas input pipeline 400 is connected to the cooled gas outlet at the bottom of the waste heat boiler 300; the other end is connected to the gas inlet at the bottom of the dry quenching furnace 100. The gas input pipeline 400 is mainly equipped with a circulating fan 410, a flue gas extraction port 430, and a heat pipe heat exchanger 440. The circulating fan 410 drives the circulation of gas within the pipeline; the flue gas extraction port 430 discharges some gas to reduce sulfur dioxide concentration; and the heat pipe heat exchanger 440 further cools the gas to meet the cooling needs of the coke in the dry quenching furnace 100. The heat pipe heat exchanger 440 mainly includes heat pipes, a heat exchanger shell, a liquid collection pipe, and a steam pipe. Due to the influence of sulfur dioxide concentration and temperature in the dry quenching flue gas, and in order to solve the problem of poor desulfurization effect, and considering the characteristics of current calcium-based sulfur dioxide treatment, the applicant analyzed the possible gas intake points in the flue gas system. Firstly, this must be achieved in a positive pressure region. Therefore, a flue gas extraction port 430 is set on the gas input pipeline 400. The existing technology designs the gas intake point on the pipeline between the heat pipe heat exchanger 440 and the dry quenching furnace 100. Testing showed that the outlet temperature of the pipeline between the heat pipe heat exchanger 440 and the dry quenching furnace 100 is in the range of 115~130℃, while the ideal temperature for the reaction between calcium and sulfur dioxide is above 140℃. Therefore, in this embodiment, the gas intake point is set on the pipeline between the circulating fan 410 and the heat pipe heat exchanger 440, where the temperature is 160~180℃. Considering the degree of cooling during pipeline transportation, this can meet the ideal temperature requirement for the reaction between calcium and sulfur dioxide, thereby significantly improving the sulfur dioxide treatment efficiency. Meanwhile, the flue gas extraction port 430 is connected to the flue gas emission pipeline 450. The existing pipeline design connects to the dust collection hood and then inputs into the desulfurization treatment system 500. However, a large amount of air is drawn in during this process, which not only reduces the temperature of the dry quenching flue gas, but also mixes in a large amount of oxygen into the system. Therefore, in this embodiment, the flue gas emission pipeline 450 is directly and tightly connected to the desulfurization treatment system 500, thereby ensuring that the gas has a sufficient reaction temperature and that a large amount of air is not mixed in to affect the reaction.

[0044] One specific working method of this embodiment is as follows:

[0045] First, hot red-hot coke is fed into the dry quenching furnace 100 through the coke inlet 112. The coke is cooled in the coke cooling chamber by exchanging heat with the gas. The cooled coke is discharged from the coke outlet 122 and transported to the storage area by a belt conveyor. At the same time, the gas circulates sequentially through the dry quenching furnace 100, the gas outlet pipeline 200, the waste heat boiler 300, and the gas inlet pipeline 400, undergoing repeated temperature changes. During the circulation process, part of the gas is discharged through the flue gas extraction port 430 on the gas inlet pipeline 400 and transported to the desulfurization treatment system for treatment, thereby reducing the sulfur dioxide content in the circulating gas and avoiding environmental pollution and equipment damage.

[0046] In this embodiment, the dry quenching coke treatment system utilizes a gas circulation channel formed by a dry quenching furnace 100, a gas output pipeline 200, a waste heat boiler 300, and a gas input pipeline 400. This allows the gas used for cooling coke within the dry quenching furnace 100 to be recycled, and the heat from the gas is recovered through the waste heat boiler 300. Furthermore, the flue gas extraction port 430 between the circulating fan 410 and the heat pipe heat exchanger 440 on the gas input pipeline 400, along with the sealed flue gas discharge pipeline 450, allows flue gas with a more suitable reaction temperature to be input into the desulfurization treatment system 500, preventing the entry of external cold air. This improves desulfurization efficiency and effectiveness, and solves the problem in existing desulfurization and denitrification systems where flue gas is drawn from the pipeline between the heat pipe heat exchanger and the dry quenching furnace, and desulfurization is poorly achieved through calcium-based treatment of sulfur dioxide, leading to increased difficulty in environmental management.

[0047] Furthermore, in this embodiment, an air intake pipe 114 is also provided on the upper shell of the dry quenching furnace 100. Additionally, a vibrating feeder 124 and a conveying pipe 126 are provided on the coke outlet 122 at the bottom of the coke cooling chamber 120 of the dry quenching furnace 100. The discharge end of the vibrating feeder 124 is connected to the feed end of the conveying pipe 126, and the discharge end of the conveying pipe 126 is connected to the belt conveyor. By providing the vibrating feeder 124, the coke in the coke cooling chamber 120 can be quickly discharged, reducing material buildup and avoiding impact on subsequent dry quenching operations. A rotary sealing valve 128 is provided on the conveying pipe 126 to control the discharge speed of the coke cooling chamber 120, preventing excessively fast discharge speeds that could cause material buildup and blockage on the belt conveyor below, affecting normal system production.

[0048] Furthermore, in this embodiment, a primary dust collector 210 is also installed on the gas output pipeline 200. The primary dust collector 210 is used to remove dust from the high-temperature flue gas with a temperature of approximately 800°C or higher in the gas output pipeline 200, preventing impurities from entering the waste heat boiler 300 and affecting its operation. Additionally, a venting device 212 is installed on the primary dust collector 210. When the pressure inside the primary dust collector 210 exceeds a set value, the pressure sensor in the venting device 212 detects a signal and controls the venting valve to open, allowing the gas to be discharged, thereby protecting the safe operation of the primary dust collector 210 and related equipment.

[0049] Furthermore, in this embodiment, a secondary dust collector 420 is installed on the gas input pipeline 400, located between the end connecting the waste heat boiler 300 and the circulating fan 410, to further remove impurities from the gas and prevent impurities from entering the circulating fan 410 and affecting its operation. Additionally, the flue gas emission pipeline 450 of the gas input pipeline 400 is equipped with a first branch pipe 460 and a second branch pipe 470. The first branch pipe 460 connects to the environmental ground dust removal system 600 and is equipped with a dust collection hood 462 for collecting dust and impurities; the second branch pipe 470 connects to the air discharge port 472 for venting. Meanwhile, in this embodiment, a first butterfly valve 454 is installed on the main pipeline of the flue gas emission pipeline 450 that connects to the desulfurization treatment system 500; a second butterfly valve 464 is installed on the first branch pipe 460; and a third butterfly valve 474 is installed on the second branch pipe 470. When the flue gas emission pipeline 450 supplies gas to the desulfurization treatment system 500 for desulfurization treatment, the first butterfly valve 454 can be opened and the second butterfly valve 464 and the third butterfly valve 474 can be closed, thereby preventing external cold air from being drawn back into the desulfurization treatment system 500 and avoiding any impact on the desulfurization treatment process.

[0050] Furthermore, in this embodiment, a first electric slide gate valve 401 is installed on the gas input pipeline 400 at the end connected to the waste heat boiler 300; and a second electric slide gate valve 402 is installed on the gas input pipeline 400 at the outlet end of the heat pipe heat exchanger 440. By installing the first electric slide gate valve 401 and the second electric slide gate valve 402, the entire circulation pipeline can be cut off in time in the event of system failure or shutdown.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dry quenching coke treatment system, characterized in that, Include: Dry quenching furnace (100) is used for gas heat exchange to cool high-temperature coke; Waste heat boiler (300) for producing steam using the high-temperature gas produced by the dry quenching furnace (100); A gas output pipeline (200) connects the dry quenching furnace (100) and the waste heat boiler (300); the gas output pipeline (200) is used to supply gas to the waste heat boiler (300); A gas input pipeline (400) connects the dry quenching furnace (100) and the waste heat boiler (300); the gas input pipeline (400) is used to supply gas to the dry quenching furnace (100); The gas input pipeline (400) is equipped with a circulating fan (410) and a heat pipe heat exchanger (440); a flue gas extraction port (430) is provided on the pipeline between the circulating fan (410) and the heat pipe heat exchanger (440), and the flue gas extraction port (430) is connected to the desulfurization treatment system (500) through a closed flue gas discharge pipeline (450).

2. The dry quenching system as described in claim 1, characterized in that, The dry quenching furnace (100) is equipped with a coke storage tank (110) and a coke cooling chamber (120); the top of the coke storage tank (110) is equipped with a coke inlet (112); the bottom of the coke cooling chamber (120) is equipped with a coke outlet (122).

3. The dry quenching system as described in claim 2, characterized in that, A vibrating feeder (124) and a transport pipe (126) are provided on the coke outlet (122).

4. The dry quenching system as described in claim 3, characterized in that, A rotary sealing valve (128) is installed on the transport pipeline (126).

5. The dry quenching system as described in claim 1, characterized in that, A primary dust collector (210) is installed on the gas output pipeline (200).

6. The dry quenching system as described in claim 5, characterized in that, The primary dust collector (210) is equipped with a venting device (212); when the pressure inside the primary dust collector (210) exceeds the set value, the pressure sensor in the venting device (212) can detect the signal and control the venting valve to open, so that the gas inside the primary dust collector (210) can be discharged.

7. The dry quenching system as described in claim 1, characterized in that, A secondary dust collector (420) is installed on the gas input pipeline (400) and at the position between one end of the waste heat boiler (300) and the circulating fan (410).

8. The dry quenching system as described in claim 1, characterized in that, The flue gas emission pipeline (450) is provided with a first branch pipe (460) and a second branch pipe (470); the first branch pipe (460) is connected to the environmental ground dust removal system (600), and a dust suction hood (462) is provided on the first branch pipe (460); the second branch pipe (470) is connected to an air discharge port (472).

9. The dry quenching system as described in claim 8, characterized in that, A first butterfly valve (454) is installed on the main pipeline connecting the flue gas emission pipeline (450) and the desulfurization treatment system (500); a second butterfly valve (464) is installed on the first branch pipe (460); and a third butterfly valve (474) is installed on the second branch pipe (470).

10. The dry quenching system as described in any one of claims 1-9, characterized in that, A first electric slide gate valve (401) is provided on the gas input pipeline (400) at one end connected to the waste heat boiler (300); a second electric slide gate valve (402) is provided on the gas input pipeline (400) at the outlet end of the heat pipe heat exchanger (440).

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