Flue gas desulfurization device for blast furnace hot blast stove

Abstract

The utility model provides a flue gas desulfurization device for a blast furnace hot blast stove, which relates to the technical field of desulfurization and comprises a main pipeline, a heat exchange component, a desulfurization component and a barrier plate, the main pipeline is used for being connected between the hot blast stove and a chimney, and the barrier plate is arranged on a pipeline for communicating an outlet of the heat exchange component with a second valve body. An inlet of the heat exchange assembly communicates with the first valve body, an outlet of the heat exchange assembly communicates with an inlet of the desulfurization assembly, and an outlet of the desulfurization assembly communicates with the second valve body. The blocking plate is arranged between the outlet of the heat exchange assembly and the second valve body, the outlet of the heat exchange assembly is communicated with the inlet of the desulfurization assembly, the outlet of the desulfurization assembly is communicated with the second valve body, and the first valve body and the second valve body on the main pipeline are fully utilized; a valve body does not need to be additionally arranged on the portion, located between the second valve body and the chimney, of the main pipeline, the built chimney and the main pipeline do not need to be reconstructed, and the reconstruction difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the field of desulfurization technology, and more specifically, to a desulfurization device for flue gas from a blast furnace hot blast stove. Background Technology

[0002] The blast furnace hot blast stove is a key supporting equipment for blast furnaces in ironmaking plants. The high-temperature flue gas discharged from the hot blast stove contains a large amount of sulfur. In current technology, the flue gas discharged from the hot blast stove is directly discharged from the chimney after being cooled by heat exchange components. The sulfur-containing flue gas will cause environmental pollution. For environmental protection considerations and the needs of the industry's own sustainable development, the flue gas pollutants of industries such as steel, coking, gas, glass, and cement kilns are gradually implementing ultra-low emission standards. At present, most blast furnace hot blast stoves in the steel industry have carried out desulfurization treatment of blast furnace hot blast stove flue gas. The mainstream method of blast furnace hot blast stove flue gas desulfurization is to take the flue gas after the outlet of the heat exchange components and then transport the desulfurized flue gas to the chimney. This method requires the addition of a valve body connected to the desulfurization components on the pipeline connecting the hot blast stove and the chimney, which is difficult to modify. Moreover, since many blast furnace hot blast stoves were built a long time ago, the addition of environmental protection facilities was not considered during the construction, resulting in a very short distance between the outlet of the heat exchange components and the chimney. Modifying according to the above method will cause great damage to the existing flue gas exhaust system, making the modification difficult. Utility Model Content

[0003] The problem this invention aims to solve is how to reduce the construction difficulty of hot blast stove desulfurization devices.

[0004] Therefore, this utility model provides a blast furnace hot blast stove flue gas desulfurization device, including a main pipe, a heat exchange component, a desulfurization component, and a baffle plate. The main pipe is used to connect the hot blast stove and the chimney. A first valve body and a second valve body are provided on the main pipe. The baffle plate is provided on the pipe where the outlet of the heat exchange component communicates with the second valve body. The inlet of the heat exchange component is communicated with the first valve body, the outlet of the heat exchange component is communicated with the inlet of the desulfurization component, and the outlet of the desulfurization component is communicated with the second valve body.

[0005] Optionally, the main pipeline is further provided with a first switching valve located between the first valve body and the second valve body, wherein the first switching valve is a hydraulic switching valve.

[0006] Optionally, the heat exchange assembly includes two sets of heat exchangers connected in parallel.

[0007] Optionally, a second switching valve is provided at both the inlet and outlet of the heat exchanger.

[0008] Optionally, the desulfurization assembly includes a dry desulfurization chamber, a dust collector, and an induced draft fan connected in sequence. The inlet of the dry desulfurization chamber is connected to the second valve body, and the outlet of the induced draft fan is connected to the chimney.

[0009] Optionally, an airflow regulating valve is provided on the connecting pipe between the dust collector and the induced draft fan.

[0010] Optionally, an exhaust valve is provided on the pipe connecting the outlet of the induced draft fan to the chimney.

[0011] Optionally, a cold air valve is provided on the pipeline connecting the outlet of the heat exchange component and the inlet of the desulfurization component, and the cold air valve is used to connect with the outside.

[0012] Optionally, the blast furnace hot blast stove flue gas desulfurization device also includes a temporary pipeline. The main pipeline has a first outlet located between the first valve body and the first switching valve. A second outlet is also provided between the outlet of the heat exchange component and the cold air valve. The temporary pipeline connects the first outlet and the second outlet, and a temporary valve is provided on the temporary pipeline.

[0013] Optionally, the cold air valve is a regulating valve.

[0014] Compared with the prior art, the beneficial effects of the blast furnace hot blast stove flue gas desulfurization device of this utility model are:

[0015] This invention utilizes a main pipeline between a hot blast stove and a chimney, with a first valve body at the end near the hot blast stove and a second valve body at the end near the chimney. This allows the inlet of the heat exchange component to connect to the first valve body and the outlet to connect to the second valve body. Flue gas can enter the heat exchange component via the first valve body for cooling and heat exchange. A baffle plate is installed on the pipeline connecting the outlet of the heat exchange component to the second valve body to disconnect the outlet from the second valve body. A separate pipeline connects the outlet of the heat exchange component to the inlet of the desulfurization component, allowing the cooled flue gas to directly enter the desulfurization component. Finally, the outlet of the desulfurization component is connected to the second valve body, and the desulfurized flue gas flows to the chimney through the second valve body. This fully utilizes the first and second valve bodies on the main pipeline, eliminating the need to add a new valve body to the section of the main pipeline between the second valve body and the chimney, and reducing the difficulty of modification to the existing chimney and main pipeline. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an existing desulfurization unit;

[0017] Figure 2 This is a schematic diagram of the structure of the blast furnace hot blast stove flue gas desulfurization device according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1-Hot blast furnace; 2-Chimney; 3-Main pipeline; 31-First valve body; 32-Second valve body; 33-Third valve body; 34-First switching valve; 4-Heat exchange assembly; 41-Heat exchanger; 42-Baffle plate; 43-Second switching valve; 5-Desulfurization assembly; 51-Dry desulfurization chamber; 52-Dust collector; 53-Induced draft fan; 54-Airflow regulating valve; 55-Exhaust valve; 61-Cold air valve; 62-Temporary pipeline; 63-Temporary valve. Detailed Implementation

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] It should be noted that in the description of this utility model, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "top", "bottom", "front", "back", "inner" and "outer" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this utility model, and is not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this utility model.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0023] Furthermore, although specific embodiments have been described herein with reference to them, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that different dependent claims and features herein can be combined in ways not used as described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other embodiments.

[0024] like Figure 1The diagram shows the structure of an existing hot blast stove 1 desulfurization device. The main pipe 3 connects the hot blast stove 1 and the chimney 2. A first valve body 31 and a second valve body 32 are installed on the main pipe 3. The two ends of the heat exchange component 4 are connected to the first valve body 31 and the second valve body 32, respectively. When a desulfurization component 5 is added, the inlet of the desulfurization component 5 is connected to the second valve body 32, and a third valve body 33 is installed between the second valve body 32 and the chimney 2. The outlet of the desulfurization component 5 is connected to the third valve body 33. This method requires adding a third valve body 33 to the main pipe 3. The addition of the third valve body 33 increases the difficulty of the renovation. Furthermore, the hot blast stove 1, chimney 2, and heat exchange components 4 are all existing structures with fixed positions within the factory. When constructing the hot blast stove 1, chimney 2, and heat exchange components 4, the subsequent construction of desulfurization components 5 was not considered. Therefore, due to considerations of construction cost and space planning, the distance between the outlet of heat exchange components 4 and chimney 2 is relatively short. To add the third valve body 33, the chimney 2 must be dismantled and relocated to a distant location for reconstruction, or the main pipeline 3 must be lengthened and its extension direction changed, both of which increase the difficulty of the renovation.

[0025] To solve the above problems, such as Figure 2 As shown in the figure, a blast furnace hot blast stove flue gas desulfurization device according to an embodiment of the present invention includes a main pipe 3, a heat exchange component 4, a desulfurization component 5, and a baffle plate 42. The main pipe 3 is used to connect the hot blast stove 1 and the chimney 2. A first valve body 31 and a second valve body 32 are provided on the main pipe 3. The baffle plate 42 is provided on the pipe where the outlet of the heat exchange component 4 communicates with the second valve body 32. The inlet of the heat exchange component 4 is connected to the first valve body 31, the outlet of the heat exchange component 4 is connected to the inlet of the desulfurization component 5, and the outlet of the desulfurization component 5 is connected to the second valve body 32.

[0026] In this embodiment, a main pipe 3 is installed between the hot blast furnace 1 and the chimney 2. A first valve body 31 is installed at one end of the main pipe 3 near the hot blast furnace 1, and a second valve body 32 is installed at the other end near the chimney 2. This allows the inlet of the heat exchange component 4 to communicate with the first valve body 31, and the outlet of the heat exchange component 4 to communicate with the second valve body 32. Flue gas can enter the heat exchange component 4 along the first valve body 31 for cooling and heat exchange. A baffle plate 42 is installed on the pipe connecting the outlet of the heat exchange component 4 and the second valve body 32 to prevent the outlet of the heat exchange component 4 from entering the heat exchange component 4. The second valve body 32 is disconnected, and a separate pipeline is set up to connect the outlet of the heat exchange component 4 with the inlet of the desulfurization component 5. The flue gas after heat exchange and cooling can directly enter the desulfurization component 5. Finally, the outlet of the desulfurization component 5 is connected to the second valve body 32, and the desulfurized flue gas flows to the chimney 2 through the second valve body 32. The first valve body 31 and the second valve body 32 on the main pipeline 3 are fully utilized. There is no need to add a valve body to the part of the main pipeline 3 between the second valve body 32 and the chimney 2, and there is no need to reconstruct the existing chimney 2 and the main pipeline 3, thus reducing the difficulty of reconstruction.

[0027] Optionally, such as Figure 2 As shown, the main pipeline 3 is provided with a first switching valve 34 located between the first valve body 31 and the second valve body 32. The first switching valve 34 is a hydraulic switching valve.

[0028] In this embodiment, a first switching valve 34 is provided between the first valve body 31 and the second valve body 32 on the main pipeline 3. The first switching valve 34 can control the opening and closing of the main pipeline 3. When the heat exchange component 4 and the desulfurization component 5 are working normally, the first switching valve 34 is closed, which facilitates the flow of flue gas along the heat exchange component 4 and the desulfurization component 5. When the heat exchange component 4 or the desulfurization component 5 has a problem and the flue gas cannot be transported normally, in order to avoid the situation where the high temperature flue gas in the hot air furnace 1 cannot be discharged and causes damage to the hot air furnace 1, the first switching valve 34 can be opened, and the flue gas can run directly from the hot air furnace 1 along the main pipeline 3 to the chimney 2. The first switching valve 34 is a hydraulic switching valve. The hydraulic switching valve opens and closes quickly, and it only takes 10 to 15 seconds to fully open. Compared with the opening time of the electric valve of nearly two minutes, the use of the hydraulic switching valve makes it easier to quickly open the main pipeline 3 when the heat exchange component 4 or the desulfurization component 5 has a problem.

[0029] Optionally, such as Figure 2 As shown, the heat exchange assembly 4 includes two sets of heat exchangers 41, which are connected in parallel.

[0030] In this embodiment, by setting the heat exchange component 4 as two heat exchangers 41 and connecting the two sets of heat exchangers 41 in parallel, after the flue gas enters the first valve body 31, it is divided into two paths, which are respectively connected to the inlet of the two heat exchangers 41. The pipes connecting the outlet of the two heat exchangers 41 to the second valve body 32 are equipped with baffles 42. Another pipe is provided to connect the outlet pipes of the two heat exchangers 41 and to the inlet of the desulfurization component 5. The two heat exchangers 41 can work independently without affecting each other, which facilitates the individual maintenance and replacement of the heat exchangers 41.

[0031] Specifically, the heat exchanger 41 is provided with a hot air duct and a cold air duct that are spaced apart. Flue gas enters the hot air duct and cold air is passed through the cold air duct to cool the flue gas.

[0032] Optionally, such as Figure 2 As shown, a second switching valve 43 is provided at both the inlet and outlet of the heat exchanger 41.

[0033] In this embodiment, by providing a second switching valve 43 at both the inlet and outlet of the two heat exchangers 41, the second switching valve 43 can control the opening and closing of the inlet or outlet of the heat exchanger 41, which facilitates the separate operation of the two heat exchangers 41 without affecting each other, and facilitates the individual maintenance and replacement of the heat exchangers 41.

[0034] Optionally, such as Figure 2As shown, the desulfurization assembly 5 includes a dry desulfurization chamber 51, a dust collector 52, and an induced draft fan 53 connected in sequence. The inlet of the dry desulfurization chamber 51 is connected to the second valve body 32, and the outlet of the induced draft fan 53 is connected to the chimney 2.

[0035] In this embodiment, by setting up a dry desulfurization chamber 51, a dust collector 52 and an induced draft fan 53 connected in sequence with the heat exchange component 4, it is convenient to desulfurize sulfur-containing flue gas, and to remove dust after desulfurization to reduce particulate matter in the flue gas. Finally, the flue gas is transported to the second valve body 32 by the induced draft fan 53 and discharged from the chimney 2, thereby reducing the sulfur and particulate content in the flue gas and reducing the pollution of the emitted flue gas.

[0036] Optionally, such as Figure 2 As shown, an airflow regulating valve 54 is provided on the connecting pipe between the dust collector 52 and the induced draft fan 53.

[0037] In this embodiment, by installing an airflow regulating valve 54 on the pipe connecting the dust collector 52 and the induced draft fan 53, the airflow regulating valve 54 can regulate the flow rate of flue gas to the induced draft fan 53, and can control the speed of flue gas emission according to the actual working conditions.

[0038] Optionally, such as Figure 2 As shown, an exhaust valve 55 is provided on the pipe connecting the outlet of the induced draft fan 53 to the chimney 2.

[0039] In this embodiment, an exhaust valve 55 is installed on the pipe connecting the induced draft fan 53 and the second valve body 32. The exhaust valve 55 can control the opening and closing of the pipe through which the induced draft fan 53 discharges flue gas. When not in operation, the exhaust valve 55 is closed to prevent flue gas leakage.

[0040] Optionally, such as Figure 2 As shown, a cold air valve 61 is provided on the pipeline connecting the outlet of the heat exchange component 4 and the inlet of the desulfurization component 5. The cold air valve 61 is used to connect with the outside.

[0041] In this embodiment, a cold air valve 61 is installed at the outlet of the heat exchange component 4 and the inlet of the desulfurization component 5. When the cold air valve 61 is opened, outside air enters the pipe and runs towards the desulfurization component 5 along with the flue gas. The temperature of the outside air is much lower than the temperature of the flue gas. After the outside air enters the pipe, it can cool the flue gas. The cold air valve 61 works in conjunction with the heat exchanger 41 to further reduce the temperature of the flue gas.

[0042] Specifically, the cold air valve 61 can be a three-way valve, with two openings connected to the pipeline connecting the outlet of the heat exchange component 4 and the inlet of the desulfurization component 5, and the third opening connected to the outside; a cold air duct can also be extended from the pipeline connecting the outlet of the heat exchange component 4 and the inlet of the desulfurization component 5, and the cold air valve is installed on the cold air duct.

[0043] Optionally, such as Figure 2 As shown, the blast furnace hot blast stove flue gas desulfurization device also includes a temporary pipeline 62. The main pipeline 3 has a first outlet located between the first valve body 31 and the first switching valve 34. The outlet of the heat exchange component 4 and the cold air valve 61 are also provided with a second outlet. The temporary pipeline 62 connects the first outlet and the second outlet. A temporary valve 63 is provided on the temporary pipeline 62.

[0044] In this embodiment, a first outlet is opened on the main pipe 3, located between the first valve body 31 and the first switching valve 34. A second outlet is set on the pipe between the outlet of the heat exchange component 4 and the cold air valve 61. A temporary pipe 62 is set to connect the first outlet and the second outlet. A temporary valve 63 is set on the temporary pipe. When both heat exchangers 41 are working normally, the temporary valve 63 is closed. When only one heat exchanger 41 is working and the other heat exchanger 41 is under maintenance or damaged, a single heat exchanger 41 cannot meet the cooling requirements of the flue gas. The temporary valve 63 is opened, and part of the flue gas enters the pipe between the outlet of the heat exchange component 4 and the cold air valve 61 along the temporary pipe 62. It mixes with the flue gas cooled by the working heat exchanger 41 and is further cooled by the cold air valve 61 until the cooling requirements are met.

[0045] Optionally, the cold air valve 61 is a regulating valve.

[0046] In this embodiment, by setting the cold air valve 61 as a regulating valve, the regulating valve is used to adjust the cold air flow rate and flow rate entering the cooling component. The size of the opening of the cold air valve 61 can be controlled, thereby controlling the flow rate of outside air entering the pipeline and adjusting the cooling effect of outside air on the flue gas.

[0047] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A desulfurization device for flue gas from a blast furnace hot blast stove, characterized in that, The system includes a main pipe (3), a heat exchange assembly (4), a desulfurization assembly (5), and a baffle plate (42). The main pipe (3) is used to connect the hot air furnace (1) and the chimney (2). A first valve body (31) and a second valve body (32) are provided on the main pipe (3). The baffle plate (42) is provided on the pipe where the outlet of the heat exchange assembly (4) is connected to the second valve body (32). The inlet of the heat exchange assembly (4) is connected to the first valve body (31). The outlet of the heat exchange assembly (4) is connected to the inlet of the desulfurization assembly (5). The outlet of the desulfurization assembly (5) is connected to the second valve body (32).

2. The blast furnace hot blast stove flue gas desulfurization device according to claim 1, characterized in that, The main pipeline (3) is also provided with a first switching valve (34) located between the first valve body (31) and the second valve body (32), and the first switching valve (34) is a hydraulic switching valve.

3. The blast furnace hot blast stove flue gas desulfurization device according to claim 1, characterized in that, The heat exchange assembly (4) includes two sets of heat exchangers (41), which are connected in parallel.

4. The blast furnace hot blast stove flue gas desulfurization device according to claim 3, characterized in that, The heat exchanger (41) is equipped with a second switching valve (43) at both the inlet and outlet.

5. The blast furnace hot blast stove flue gas desulfurization device according to claim 1, characterized in that, The desulfurization assembly (5) includes a dry desulfurization chamber (51), a dust collector (52) and an induced draft fan (53) connected in sequence. The inlet of the dry desulfurization chamber (51) is connected to the second valve body (32), and the outlet of the induced draft fan (53) is connected to the chimney (2).

6. The blast furnace hot blast stove flue gas desulfurization device according to claim 5, characterized in that, An airflow regulating valve (54) is provided on the connecting pipe between the dust collector (52) and the induced draft fan (53).

7. The blast furnace hot blast stove flue gas desulfurization device according to claim 5, characterized in that, An exhaust valve (55) is provided on the pipe connecting the outlet of the induced draft fan (53) to the chimney (2).

8. The blast furnace hot blast stove flue gas desulfurization device according to claim 2, characterized in that, A cold air valve (61) is provided on the pipeline connecting the outlet of the heat exchange component (4) and the inlet of the desulfurization component (5). The cold air valve (61) is used to connect with the outside.

9. The blast furnace hot blast stove flue gas desulfurization device according to claim 8, characterized in that, It also includes a temporary pipeline (62), on which a first outlet is provided between the first valve body (31) and the first switch valve (34), and a second outlet is provided between the outlet of the heat exchange component (4) and the cold air valve (61). The temporary pipeline (62) connects the first outlet and the second outlet, and a temporary valve (63) is provided on the temporary pipeline (62).

10. The blast furnace hot blast stove flue gas desulfurization device according to claim 8, characterized in that, The cold air valve (61) is a regulating valve.

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