Flue gas desulfurization system

Abstract

The utility model belongs to the technical field of flue gas desulfurization, and discloses a flue gas desulfurization system which is used for desulfurizing flue gas output by a main boiler, the flue gas desulfurization system comprises a main pipeline, a dust removal assembly, an absorption tower, a chimney and a starting boiler, the input end of the main pipeline is communicated with the flue gas output end of the main boiler; the dust removal assembly is connected with the main pipeline; the absorption tower is connected with the main pipeline; the chimney is connected with the main pipeline and is arranged at the downstream of the absorption tower; the starting boiler is connected with an output pipeline for discharging the flue gas, the output pipeline is respectively communicated with the starting boiler and the main pipeline, and the dust removal assembly and the absorption tower are both arranged at the downstream of the output pipeline. Thus, flue gas generated during combustion in the starting boiler can enter the main pipeline through the output pipeline, desulfurization and dust removal work is carried out through the dust removal assembly and the absorption tower, and the treatment efficiency of the flue gas in the starting boiler is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas desulfurization, in particular to a flue gas desulfurization system. Background Art

[0002] Flue gas desulfurization is a process for removing sulfur oxides from flue gas or other industrial waste gases. The high-temperature sulfur-containing flue gas generated by the combustion of fuel gas in the boiler is transported to the flue gas desulfurization system. After desulfurization and dust removal, exhaust gas that meets emission conditions is formed and discharged to the outside.

[0003] The flue gas desulfurization system includes an absorption tower and a chimney. The flue gas output end of the main boiler, the absorption tower and the chimney are connected through a pipeline. The high-temperature sulfur-containing flue gas output by the main boiler enters the absorption tower for desulfurization and demisting, and then is discharged to the outside through the chimney. At present, thermal power plants with coal-fired units are usually equipped with a startup boiler. Before the main boiler is started, the startup boiler runs first to generate steam, and the generated steam is transported to the main boiler to assist the startup of the main boiler. In order to meet environmental protection requirements, a flue gas treatment device is usually set at the flue gas output end of the startup boiler so that the flue gas discharged from the startup boiler to the chimney meets environmental protection requirements.

[0004] However, setting a flue gas treatment device at the flue gas output end of the startup boiler not only has high installation and use costs, but also with the drastic changes in the startup boiler fuel, the treatment efficiency of the flue gas treatment device is low and may not be able to treat the flue gas emitted by the startup boiler in time, increasing the flue gas treatment burden in the flue gas desulfurization system, making it difficult for the flue gas emitted by the startup boiler to meet environmental protection requirements. Utility Model Content

[0005] The utility model aims to provide a flue gas desulfurization system to solve the problem of low flue gas treatment efficiency generated when starting boiler combustion.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A flue gas desulfurization system is used for desulfurizing the flue gas output by a main boiler, and the flue gas desulfurization system comprises:

[0008] A main pipeline, the input end of which is connected to the flue gas output end of the main boiler;

[0009] A dust removal component, the dust removal component is connected to the main pipeline and is used to remove dust in the flue gas;

[0010] an absorption tower, the absorption tower being connected to the main pipeline and being used for desulfurizing the flue gas;

[0011] A chimney, which is connected to the main pipeline and arranged downstream of the absorption tower, and is used to discharge the flue gas after desulfurization;

[0012] A start-up boiler is connected to an output pipe for discharging the smoke, the output pipe is respectively connected to the start-up boiler and the main pipe, and the absorption tower and the dust removal component are both arranged downstream of the output pipe.

[0013] Preferably, the dust removal assembly includes a first dust collector, which is arranged between the absorption tower and the chimney.

[0014] Preferably, the dust removal assembly further includes a second dust collector, which is arranged between the input end of the main pipeline and the absorption tower.

[0015] Preferably, the first dust collector is a wet dust collector; and / or the second dust collector is an electrostatic precipitator.

[0016] Preferably, a main control component is provided at the input end of the main pipeline, and the main control component is arranged upstream of the output pipeline to control the flow of the flue gas discharged by the main boiler in the main pipeline.

[0017] Preferably, the output pipeline is provided with an output control member for controlling the flow of the flue gas discharged by the startup boiler in the output pipeline.

[0018] Preferably, the main control component is a pneumatic door; and / or the output control component is a pneumatic door.

[0019] Preferably, the startup boiler is connected to an input pipe, the interior of the input pipe is connected to the interior of the startup boiler, and the input pipe is provided with a first conveying member for conveying external gas to the interior of the startup boiler; and / or, the output pipe is provided with a second conveying member for conveying the flue gas discharged by the startup boiler to the main pipe.

[0020] Preferably, when the flue gas desulfurization system includes the first conveying member, the first conveying member is a blower; when the flue gas desulfurization system includes the second conveying member, the second conveying member is an induced draft fan; when the flue gas desulfurization system includes the first conveying member and the second conveying member, the first conveying member is a blower and the second conveying member is an induced draft fan.

[0021] Preferably, the flue gas desulfurization system further comprises a main conveying member, which is arranged downstream of the output pipeline and is used for conveying the flue gas in the main pipeline.

[0022] Beneficial effects of the utility model:

[0023] A flue gas desulfurization system is used for desulfurizing the flue gas output by a main boiler, and the flue gas desulfurization system comprises: a main pipeline, the input end of the main pipeline is connected to the flue gas output end of the main boiler; a dust removal component, the dust removal component is connected to the main pipeline and is used to remove dust in the flue gas; an absorption tower, the absorption tower is connected to the main pipeline and is used to desulfurize the flue gas; a chimney, the chimney is connected to the main pipeline and is arranged downstream of the absorption tower, and is used to discharge the desulfurized flue gas; a starting boiler, the starting boiler is connected to an output pipeline for discharging the flue gas, the output pipeline is respectively connected to the starting boiler and the main pipeline, and the absorption tower and the dust removal component are both arranged downstream of the output pipeline.

[0024] In this way, in order to transport water vapor to the main boiler and assist in starting the main boiler, fuel needs to be burned inside the startup boiler to generate water vapor and transport it to the main boiler. The high-temperature sulfur-containing flue gas generated during the combustion process can be transported to the inside of the main pipeline through the output pipeline and flow through the dust removal component and the absorption tower to achieve dust removal and desulfurization treatment of the flue gas inside the startup boiler, thereby improving the treatment efficiency of the flue gas inside the startup boiler and ensuring that the flue gas discharged from the startup boiler to the outside meets environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a flue gas desulfurization system in one embodiment of the utility model.

[0026] In the figure:

[0027] 1. Main pipeline; 11. Main control component; 2. Dust removal component; 21. First dust collector; 22. Second dust collector; 3. Absorption tower; 4. Chimney; 5. Start boiler; 51. Input pipeline; 511. First conveying component; 52. Output pipeline; 521. Second conveying component; 522. Output control component; 6. Main conveying component; 7. Baffle door; 8. Emergency sprinkler. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0032] See also Figure 1 The utility model provides a flue gas desulfurization system, which is used for desulfurizing the flue gas outputted from the main boiler (not shown in the figure). The flue gas desulfurization system comprises a main pipeline 1, a dust removal component 2, an absorption tower 3, a chimney 4 and a start-up boiler 5. The input end of the main pipeline 1 is connected to the flue gas output end of the main boiler; the dust removal component 2 is connected to the main pipeline 1 for removing dust in the flue gas; the absorption tower 3 is connected to the main pipeline 1 for desulfurizing the flue gas; the chimney 4 is connected to the main pipeline 1 and arranged downstream of the absorption tower 3 for discharging the desulfurized flue gas; the start-up boiler 5 is connected to an output pipeline 52 for discharging the flue gas, the output pipeline 52 is respectively connected to the start-up boiler 5 and the main pipeline 1, and the absorption tower 3 and the dust removal component 2 are both arranged downstream of the output pipeline 52. Among them, one end of the main pipeline 1 connected to the flue gas output end of the main boiler is the input end of the main pipeline 1.

[0033] It should be noted that the startup boiler 5 is provided with independent combustion chambers (not shown in the figure) and steam chambers (not shown in the figure), and the steam chamber is connected to the main boiler through a pipeline (not shown in the figure). The fuel burns in the combustion chamber to generate heat, which increases the temperature of the steam chamber, thereby evaporating the liquid water in the steam chamber into water vapor, which is transported to the main boiler to assist in starting the main boiler.

[0034] In this embodiment, one end of the output pipe 52 is connected to the combustion chamber, and the other end is connected to the main pipe 1, which is used to transport the high-temperature sulfur-containing gas generated when the fuel in the combustion chamber is burned to the inside of the main pipe 1.

[0035] Furthermore, the flue gas desulfurization system also includes an emergency spray device 8, which is connected to the input end of the absorption tower 3 and is used for spraying and cooling the high-temperature sulfur-containing flue gas when an accident occurs.

[0036] In this way, in order to assist the start-up of the main boiler, the start-up boiler 5 burns fuel to heat the steam chamber to produce auxiliary water vapor. The high-temperature sulfur-containing flue gas generated during the fuel combustion process can be transported to the inside of the main pipeline 1 through the output pipe 52, and flow through the dust removal component 2 and the absorption tower 3, so that the dust removal component 2 and the absorption tower 3 process the high-temperature sulfur-containing flue gas, thereby avoiding the reduction of the flue gas treatment efficiency of the start-up boiler 5 due to the significant change of the fuel in the start-up boiler 5, reducing the flue gas treatment burden in the flue gas desulfurization system, and ensuring that the flue gas discharged from the start-up boiler 5 to the outside meets environmental protection requirements.

[0037] See also Figure 1 In some embodiments, the dust removal assembly 2 includes a first dust collector 21, which is disposed between the absorption tower 3 and the chimney 4. The first dust collector 21 is disposed on the main pipeline 1 and is connected in series with the absorption tower 3, which is disposed downstream of the output pipeline 52, so that the flue gas discharged by the startup boiler 5 can enter the absorption tower 3 through the output pipeline 52 and the main pipeline 1 for desulfurization and demisting.

[0038] In this way, the high-temperature sulfur-containing flue gas generated by the main boiler and the startup boiler 5 can be transported to the inside of the absorption tower 3 through the main pipeline 1. After the high-temperature sulfur-containing flue gas passes through the absorption tower 3 for desulfurization and demisting, it is transported to the first dust collector 21 through the main pipeline 1, which can remove dust particles in the flue gas, so that the flue gas discharged to the outside through the chimney 4 meets environmental protection requirements.

[0039] See also Figure 1 In some embodiments, the dust removal assembly 2 further includes a second dust collector 22 , and the second dust collector 22 is disposed between the input end of the main pipeline 1 and the absorption tower 3 .

[0040] In this embodiment, the second dust collector 22 is arranged downstream of the output pipe 51, so that the flue gas discharged by the startup boiler 5 passes through the second dust collector 22, the absorption tower 3 and the first dust collector 21 in sequence through the output pipe 51.

[0041] In this way, after the flue gas emitted by the startup boiler 5 passes through the second dust collector 22, some dust particles can be removed, and after entering the absorption tower 3 for desulfurization and demisting, it enters the first dust collector 21 for further dust removal. That is, the flue gas emitted by the startup boiler 5 is subjected to the same desulfurization and dust removal treatment as the flue gas emitted by the main boiler; a flue gas treatment device is set at the flue gas output end of the startup boiler 5, and the flue gas treatment device is also shut down after the startup boiler 5 stops working, and the equipment utilization rate is low. When the fuel inside the startup boiler 5 changes significantly, the treatment efficiency of the flue gas treatment device is low, which may cause flue gas that does not meet environmental protection requirements to be discharged to the outside; the flue gas emitted by the startup boiler 5 enters the main pipeline 1, which can not only effectively utilize the various treatment equipment in the flue gas desulfurization system, but also improve the flue gas treatment efficiency, so that the flue gas discharged to the outside by the startup boiler 5 can meet environmental protection requirements.

[0042] It can be understood that the setting position of the first dust collector 21 and the setting position of the second dust collector 22 can be flexibly adjusted according to the connection position of the output pipe 52 and the main pipe 1, so that the flue gas discharged from the startup boiler 5 and the flue gas discharged from the main boiler can pass through the second dust collector 22 and the first dust collector 21 in sequence, which will not be elaborated here.

[0043] See also Figure 1 In some embodiments, the first dust collector 21 is a wet dust collector, and the second dust collector 22 is an electrostatic dust collector.

[0044] In this way, the dust removal efficiency of the electrostatic precipitator is high, and it can remove particles with larger particle sizes in the flue gas. The electrostatic precipitator is arranged upstream of the absorption tower 3, and the flue gas discharged from the main boiler or the startup boiler 5 can be preliminarily dusted, reducing the desulfurization burden of the absorption tower 3 and avoiding scaling and clogging inside the absorption tower 3. The wet dust collector can further remove small particles in the flue gas, so that the flue gas discharged into the chimney 4 after passing through the wet dust collector meets the environmental protection standards, and improves the flue gas treatment efficiency of the flue gas desulfurization system.

[0045] It is understandable that the specific dust removal method and setting position of the first dust collector 21 and the second dust collector 22 can be adjusted according to actual needs, and will not be listed in detail here.

[0046] See also Figure 1 In some embodiments, a main control component 11 is provided at the input end of the main pipeline 1 . The main control component 11 is provided upstream of the output pipeline 52 and is used to control the flow of the flue gas discharged by the main boiler in the main pipeline 1 .

[0047] In this way, when the flue gas emitted by the startup boiler 5 is transported to the main pipeline 1 through the output pipe 52, closing the main control component 11 to isolate the interior of the main boiler from the interior of the main pipeline 1 can prevent the flue gas transported to the main pipeline 1 by the output pipe 52 from flowing back into the main boiler, thereby affecting the treatment effect of the flue gas emitted by the startup boiler 5.

[0048] See also Figure 1 In some embodiments, the output pipe 52 is provided with an output control member 522 for controlling the flow of the flue gas discharged by the startup boiler 5 in the output pipe 52. The output control member 522 is provided between the startup boiler 5 and the main pipe 1.

[0049] In this way, when the main boiler is operating normally, the output control component 522 is closed to isolate the interior of the output pipe 52 from the interior of the main pipe 1, thereby preventing the flue gas emitted by the main boiler from entering the interior of the startup boiler 5 through the output pipe 52, thereby increasing the flue gas content inside the startup boiler 5; when the main boiler is shut down, the main control component 11 is closed and the output control component 522 is opened, so that the flue gas inside the startup boiler 5 is discharged through the output pipe 52 into the main pipe 1 for dust removal and desulfurization, thereby making the flue gas emitted by the startup boiler 5 meet environmental protection requirements.

[0050] See also Figure 1 In some embodiments, the main control component 11 and the output control component 522 are both pneumatic doors.

[0051] It can be understood that the main control component 11 and the output control component 522 can also be fluid control devices such as solenoid valves and check valves. The specific structure of the main control component 11 and the specific structure of the output control component 522 can be adjusted according to actual needs. They can control the connectivity between the inside of the main pipeline 1 and the inside of the main boiler, and the connectivity between the inside of the main pipeline 1 and the inside of the output pipeline 52. No more examples are listed here.

[0052] See also Figure 1 In some embodiments, the startup boiler 5 is connected to an input pipe 51, the interior of the input pipe 51 is connected to the interior of the startup boiler 5, and a first conveying member 511 for conveying external gas to the interior of the startup boiler 5 is provided on the input pipe 51; the output pipe 52 is provided with a second conveying member 521 for conveying the flue gas discharged by the startup boiler 5 to the main pipe 1.

[0053] Among them, one end of the input pipe 51 is connected to the outside world, and the other end is connected to the combustion chamber of the startup boiler 5. The first conveying member 511 is arranged at the end of the input pipe 51 connected to the outside world, and the second conveying member 521 is arranged at the end of the output pipe 52 connected to the startup boiler 5.

[0054] In this way, the first conveying member 511 conveys the outside air to the inside of the starting boiler 5 through the input pipe 51, and the second conveying member 521 conveys the gas inside the starting boiler 5 to the main pipe 1 through the output pipe 52, so that a directional airflow can be formed inside the input pipe 51, the starting boiler 5, and the output pipe 52, and then the flue gas generated during combustion in the combustion chamber can be transported to the main pipe 1 under the action of the second conveying member 521, so as to achieve dust removal and desulfurization treatment of the flue gas in the starting boiler 5, so that the flue gas discharged to the outside by the starting boiler 5 can meet environmental protection requirements.

[0055] See also Figure 1 Furthermore, the first conveying member 511 is a blower, and the second conveying member 521 is an induced draft fan.

[0056] It can be understood that the first conveying member 511 and the second conveying member 521 can also be air pumps, fans and other equipment. The specific structure and setting position of the first conveying member 511 and the second conveying member 521 can be adjusted according to actual needs, so as to realize the directional conveying of the flue gas in the startup boiler 5 to the inside of the main pipeline 1.

[0057] See also Figure 1 In some embodiments, the flue gas desulfurization system further includes a main conveying component 6 , which is disposed downstream of the output pipeline 52 and is used to convey the flue gas in the main pipeline 1 .

[0058] In this way, the main conveying member 6 can further guide the flow direction of the flue gas in the main pipeline 1, so that the flue gas passing through the second dust collector 22 is directionally conveyed to the absorption tower 3, thereby improving the flue gas treatment efficiency, and allowing the high-temperature sulfur-containing flue gas inside the startup boiler 5 or the main boiler to be discharged to the outside in accordance with environmental protection requirements.

[0059] It is understandable that the main conveying member 6 can also be an air pump, a fan or other equipment. The specific structure of the main conveying member 6 can be adjusted according to actual needs and will not be listed in detail here. In this embodiment, the main conveying member 6 is an induced draft fan.

[0060] See also Figure 1 Furthermore, the flue gas desulfurization system also includes a damper door 7, which is arranged between the main conveying member 6 and the emergency spray device 8 for selectively controlling the flow of flue gas.

[0061] See also Figure 1 In some embodiments, the flue gas desulfurization system also includes a control system (not shown in the figure), and the first dust collector 21, the second dust collector 22, the first conveying member 511, the second conveying member 521, the output control member 522, the main conveying member 6, the baffle door 7, and the emergency spray device 8 are all connected to the control system, so that the control system can send control signals to each device according to work needs.

[0062] It is understandable that sending control signals (eg, control on signals, control off signals) to various devices through a control system is a prior art and will not be elaborated herein.

[0063] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A flue gas desulfurization system, characterized in that: Used for desulfurizing the flue gas output from the main boiler, the flue gas desulfurization system comprises: A main pipeline (1), the input end of the main pipeline (1) being connected to the flue gas output end of the main boiler; A dust removal component (2), the dust removal component (2) being connected to the main pipeline (1) and being used for removing dust from the flue gas; An absorption tower (3), the absorption tower (3) being connected to the main pipeline (1) and being used for desulfurizing the flue gas; a chimney (4), the chimney (4) being connected to the main pipeline (1) and arranged downstream of the absorption tower (3) for discharging the flue gas after desulfurization; A start-up boiler (5) is connected to an output pipe (52) for discharging the flue gas, the output pipe (52) is respectively connected to the start-up boiler (5) and the main pipe (1), and the absorption tower (3) and the dust removal component (2) are both arranged downstream of the output pipe (52).

2. The flue gas desulfurization system according to claim 1, characterized in that: The dust removal assembly (2) comprises a first dust collector (21), wherein the first dust collector (21) is arranged between the absorption tower (3) and the chimney (4).

3. The flue gas desulfurization system according to claim 2, characterized in that: The dust removal assembly (2) further comprises a second dust collector (22), wherein the second dust collector (22) is arranged between the input end of the main pipeline (1) and the absorption tower (3).

4. The flue gas desulfurization system according to claim 3, characterized in that: The first dust collector (21) is a wet dust collector; and / or the second dust collector (22) is an electrostatic dust collector.

5. The flue gas desulfurization system according to claim 1, characterized in that: A main control component (11) is provided at the input end of the main pipeline (1). The main control component (11) is arranged upstream of the output pipeline (52) and is used to control the flow of the flue gas discharged by the main boiler in the main pipeline (1).

6. The flue gas desulfurization system according to claim 5, characterized in that: The output pipe (52) is provided with an output control member (522) for controlling the flow of the flue gas discharged by the startup boiler (5) in the output pipe (52).

7. The flue gas desulfurization system according to claim 6, characterized in that: The main control component (11) is a pneumatic door; and / or the output control component (522) is a pneumatic door.

8. The flue gas desulfurization system according to any one of claims 1 to 7, characterized in that: The startup boiler (5) is connected to an input pipe (51), the interior of the input pipe (51) is in communication with the interior of the startup boiler (5), and the input pipe (51) is provided with a first conveying member (511) for conveying external gas to the interior of the startup boiler (5); and / or the output pipe (52) is provided with a second conveying member (521) for conveying flue gas discharged by the startup boiler (5) to the main pipe (1).

9. The flue gas desulfurization system according to claim 8, characterized in that: When the flue gas desulfurization system includes the first conveying member (511), the first conveying member (511) is a blower; when the flue gas desulfurization system includes the second conveying member (521), the second conveying member (521) is an induced draft fan; when the flue gas desulfurization system includes the first conveying member (511) and the second conveying member (521), the first conveying member (511) is a blower, and the second conveying member (521) is an induced draft fan.

10. The flue gas desulfurization system according to any one of claims 1 to 7, characterized in that: The flue gas desulfurization system further comprises a main conveying member (6), which is arranged downstream of the output pipeline (52) and is used for conveying the flue gas in the main pipeline (1).

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