Flue gas emission device
By designing a flue gas emission device containing two mutually reserved desulfurization and denitrification devices, the problems of high operating and maintenance costs, low utilization rate and high environmental risks of flue gas emission devices in chemical enterprises have been solved, and qualified flue gas indicators have been achieved. and the shortening of start-up time.
Patent Information
- Application Number
- CN202421237677.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-05-31
AI Technical Summary
The operating and maintenance costs of flue gas emission devices in chemical enterprises are high, the utilization rate is low, and there is no backup device when the desulfurization and denitrification system fails, resulting in the flue gas index exceeding the national standards, polluting the environment, and having high environmental protection risks.
Design a flue gas emission device, including two mutually reserved desulfurization and denitrification devices, connect the inlet flue gas main pipes of the two devices through a communicating pipe to realize the interoperability of flue gas. When a set of devices fails, the flue gas can be automatically Switch to another set of devices to ensure that the emission indicators meet national standards.
The mutual backup of the two desulfurization and denitrification devices is achieved, ensuring the qualified emission of flue gas indicators, reducing environmental protection risks, and increasing the flue gas heating speed during the start-up stage, shortening the start-up time.
Smart Images
Figure CN222489584U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of desulfurization and denitrification, and particularly relates to a flue gas emission device. Background Art
[0002] At present, the state requires that the flue gas emission concentration of chemical enterprises meet the emission limit: particulate matter ≤ 20mg / m 3 , sulfur dioxide ≤ 50mg / m 3 、Nitrogen oxides ≤ 100mg / m 3 Chemical companies introduce the flue gas from a single heating furnace into a single set of desulfurization and denitrification equipment for purification. After meeting the national standards, the flue gas is discharged through the discharge port. The operation and maintenance costs of the equipment are high, the utilization rate is low, and when the desulfurization and denitrification system fails, there is no backup device, which will cause the exhaust gas indicators to exceed the national standards, pollute the environment, and have high environmental risks. Utility Model Content
[0003] In view of the above problems existing in the prior art, the purpose of the embodiment of the utility model is to provide a flue gas discharge device which can ensure that the exhaust flue gas index is qualified and realize the mutual backup of two desulfurization and denitrification devices.
[0004] The technical solution adopted in the embodiment of the utility model is:
[0005] A smoke exhaust device, comprising:
[0006] A first desulfurization and denitration device having a first inlet flue gas main;
[0007] A second desulfurization and denitrification device having a second inlet flue gas main;
[0008] A plurality of first heating furnaces and a plurality of second heating furnaces, wherein the smoke outlet pipeline of each of the first heating furnaces is respectively connected to the first inlet smoke main pipe; and the smoke outlet pipeline of each of the second heating furnaces is respectively connected to the second inlet smoke main pipe;
[0009] A first flue gas chimney and a second flue gas chimney; the air inlet of the first flue gas chimney is connected to the exhaust port of the first desulfurization and denitration device through a first exhaust pipe; the air inlet of the second flue gas chimney is connected to the exhaust port of the second desulfurization and denitration device through a second exhaust pipe;
[0010] A connecting pipe, connecting the first inlet smoke main pipe and the second inlet smoke main pipe, wherein a first valve and a second valve are provided on the connecting pipe at intervals;
[0011] A first return pipe and a second return pipe, wherein the first end of the first return pipe is connected to the first smoke exhaust line, the first end of the second return pipe is connected to the second smoke exhaust line, the second end of the first return pipe and the second end of the second return pipe are respectively connected to the area between the first valve and the second valve on the connecting pipe, the first return pipe is provided with a third valve; the second return pipe is provided with a fourth valve.
[0012] Furthermore, a fifth valve is provided on the first smoke exhaust pipeline near the air inlet of the first smoke chimney; and a sixth valve is provided on the second smoke exhaust pipeline near the air inlet of the second smoke chimney.
[0013] Furthermore, the first valve to the sixth valve are respectively automatic regulating valves.
[0014] Furthermore, the number of the first heating furnaces is four, and the number of the second heating furnaces is three.
[0015] Furthermore, the flue gas outlet pipeline is provided with an automatic regulating control device for regulating the flue gas flow rate.
[0016] Furthermore, the flue gas outlet pipeline is also provided with a flow meter and a pressure transmitter.
[0017] Furthermore, the first smoke exhaust pipeline and the second smoke exhaust pipeline are respectively provided with induced draft fans.
[0018] Furthermore, there are multiple induced draft fans, and the air inlets of the multiple induced draft fans are respectively connected to the smoke exhaust outlets of the corresponding desulfurization and denitrification devices, and the air outlets of the multiple induced draft fans are respectively connected to the air inlets of the corresponding flue gas chimneys.
[0019] Compared with the prior art, the beneficial effects of the embodiments of the present invention are:
[0020] The inlet flue gas main pipes of the two desulfurization and denitration devices of the flue gas emission device of the utility model are connected through a connecting pipe. When an abnormal situation occurs in one desulfurization and denitration device, the connecting pipeline is activated to lead the flue gas to the other desulfurization and denitration device to ensure that the external exhaust flue gas index is qualified, and the two desulfurization and denitration devices are mutually backed up. At the same time, the exhaust pipes of the two desulfurization and denitration devices are respectively connected to the connecting pipe through the reflux pipe, so that the inlet and outlet flue gas of the two desulfurization and denitration devices are interconnected, the flue gas temperature rise speed in the start-up stage is increased, and the start-up time is shortened.
[0021] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to restrict the present invention.
[0022] The overview of various implementations or examples of the technology described in this utility model is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the embodiments of the utility model. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts.
[0024] Figure 1 It is a structural schematic diagram of the smoke exhaust device according to an embodiment of the utility model.
[0025] In the figure: 1. the first desulfurization and denitrification device; 2. the second desulfurization and denitrification device; 3. the first heating furnace; 4. the second heating furnace; 5. the first flue gas chimney; 6. the second flue gas chimney; 7. the connecting pipe; 8. the first return pipe; 9. the second return pipe; 10. the first valve; 11. the second valve; 12. the third valve; 13. the fourth valve; 14. the fifth valve; 15. the sixth valve; 16. the first inlet flue gas main pipe; 17. the second inlet flue gas main pipe; 18. the first smoke exhaust pipeline; 19. the second smoke exhaust pipeline; 20. the induced draft fan; 21. the automatic regulating control device; 22. the flow meter; 23. the pressure transmitter. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In order to keep the following description of the embodiments of the present invention clear and concise, the present invention omits the detailed description of known functions and known components.
[0028] The utility model provides a smoke exhaust device, such as Figure 1 As shown, the flue gas emission device mainly includes a first desulfurization and denitrification device 1, a second desulfurization and denitrification device 2, multiple first heating furnaces 3 and multiple second heating furnaces 4, a first flue gas chimney 5 and a second flue gas chimney 6, a connecting pipe 7 and a first return pipe 8 and a second return pipe 9.
[0029] The first desulfurization and denitrification device 1 has a first inlet flue gas main pipe 16 , and the second desulfurization and denitrification device 2 has a second inlet flue gas main pipe 17 .
[0030] The flue gas outlet pipeline of each first heating furnace 3 is respectively connected to the first inlet flue gas main 16, and the flue gas generated in the first heating furnace 3 enters the first desulfurization and denitration device 1 through the first inlet flue gas main 16. The flue gas outlet pipeline of each second heating furnace 4 is respectively connected to the second inlet flue gas main 17, and the flue gas generated in the second heating furnace 4 enters the second desulfurization and denitration device 2 through the second inlet flue gas main 17. Multiple first heating furnaces 3 and multiple second heating furnaces 4 share one desulfurization and denitration device, which can save investment and operation costs.
[0031] The air inlet of the first flue gas chimney 5 is connected to the exhaust port of the first desulfurization and denitration device 1 through a first exhaust pipe 18. The air inlet of the second flue gas chimney 6 is connected to the exhaust port of the second desulfurization and denitration device 2 through a second exhaust pipe 19.
[0032] The connecting pipe 7 is connected to the first inlet smoke main pipe 16 and the second inlet smoke main pipe 17. The connecting pipe 7 is provided with a first valve 10 and a second valve 11. The first valve 10 is close to the first inlet smoke main pipe 16, and the second valve 11 is close to the second inlet smoke main pipe 17.
[0033] The first end of the first return pipe 8 is communicated with the first smoke exhaust line 18 , and the first end of the second return pipe 9 is communicated with the second smoke exhaust line 19 .
[0034] The second end of the first return pipe 8 and the second end of the second return pipe 9 are respectively connected to the area between the first valve 10 and the second valve 11 on the connecting pipe 7. The first return pipe 8 is provided with a third valve 12, and the second return pipe 9 is provided with a fourth valve 13.
[0035] The specific working method of the smoke exhaust device in this embodiment is:
[0036] The flue gas generated by the multiple first heating furnaces 3 enters the first inlet flue gas main pipe 16 through the flue gas outlet pipelines thereon. The flue gas entering the first inlet flue gas main pipe 16 then enters the first desulfurization and denitrification device 1 for purification treatment, and the treated flue gas is sent to the first flue gas pipe 5 and then discharged into the atmosphere. The flue gas generated by the multiple second heating furnaces 4 is discharged in the same manner as above.
[0037] Take the example of the first desulfurization and denitration device 1 failing or being shut down for maintenance, and the second desulfurization and denitration device 2 being in normal operation. When the first desulfurization and denitration device 1 fails or is shut down for maintenance, the flue gas index cannot meet the emission limit requirements. In order to solve this problem, the first desulfurization and denitration device 1 is closed in advance, and after the flue gas in the multiple first heating furnaces 3 enters the first inlet flue gas main pipe 16, the first valve 10 and the second valve 11 on the connecting pipe 7 are opened, and the flue gas in the first inlet flue gas main pipe 16 is introduced into the connecting pipe 7, and then enters the second desulfurization and denitration device 2 through the second inlet flue gas main pipe 17 for purification, and the flue gas that meets the standard requirements is then discharged through the second flue gas pipe 6.
[0038] The desulfurization and denitration bed temperature is low during the start-up phase of the desulfurization and denitration device, and it usually takes 5 hours for the flue gas index to be normal, and the start-up time is long. Therefore, when the first desulfurization and denitration device 1 fails and the second desulfurization and denitration device 2 is used, in order to solve the problem of long heating time during the start-up phase of the first desulfurization and denitration device 1, take the normal operation of the first desulfurization and denitration device 1 and the start-up of the second desulfurization and denitration device 2 as an example. Open the third valve 12 of the first reflux pipe 8, and at the same time open the second valve 11 on the interconnecting pipe 7, and close the first valve 10, and lead the higher temperature qualified flue gas discharged from the first desulfurization and denitration device 1 to the interconnecting pipe 7 through the first reflux pipe 8, and then enter the second desulfurization and denitration device 2 through the second inlet flue gas main pipe 17, so as to increase the bed temperature rise speed in the second desulfurization and denitration device 2 and shorten the start-up time. When the bed temperature in the second desulfurization and denitration device 2 reaches the requirement, gradually close the second valve 11 and the third valve 12, and then discharge the flue gas discharged from the first desulfurization and denitration device 1 through the first flue gas pipe 5.
[0039] The specific structure and working principle of the desulfurization and denitration device of this embodiment belong to the prior art and are not specifically limited thereto. The flue gas pipe used to discharge flue gas can be a commonly used flue gas pipe structure.
[0040] The inlet flue gas main pipes of the two desulfurization and denitration devices of the flue gas emission device of the utility model are connected through the interconnection pipe 7. When an abnormal situation occurs in one desulfurization and denitration device, the interconnection pipe 7 is activated to lead the flue gas to the other desulfurization and denitration device to ensure that the exhaust flue gas index is qualified, and the two desulfurization and denitration devices are mutually backed up. At the same time, the exhaust pipes of the two desulfurization and denitration devices are respectively connected to the interconnection pipe 7 through the reflux pipe, so that the inlet and outlet flue gas of the two desulfurization and denitration devices are interconnected, the flue gas temperature rise speed in the start-up stage is increased, and the start-up time is shortened.
[0041] like Figure 1 As shown, in some embodiments, a fifth valve 14 is provided at the air inlet of the first smoke exhaust pipe 18 near the first smoke chimney 5. The connection between the first return pipe 8 and the first smoke exhaust pipe 18 is located upstream of the fifth valve 14. When the second desulfurization and denitration device 2 is heated up, the opening and closing degree of the fifth valve 14 can be adjusted to a smaller value, and the opening and closing degree of the third valve 12 on the first return pipe 8 can be adjusted to a larger value, so as to ensure that most of the flue gas treated by the first desulfurization and denitration device 1 enters the second desulfurization and denitration device 2 through the first return pipe 8, and a small amount of flue gas is discharged through the first smoke exhaust pipe. When the temperature in the second desulfurization and denitration device 2 rises to a suitable temperature, the third valve 12 is closed and the fifth valve 14 is gradually opened to ensure that the treated flue gas is discharged through the first smoke chimney 5.
[0042] Of course, the fifth valve 14 can also be closed so that all the flue gas treated by the first desulfurization and denitrification device 1 enters the second desulfurization and denitrification device 2. When the temperature in the second desulfurization and denitrification device 2 rises to a suitable temperature, the third valve 12 is closed and the fifth valve 14 is opened.
[0043] Furthermore, in this embodiment, a sixth valve 15 is provided on the second smoke exhaust line 19 near the air inlet of the second smoke pipe 6. The connection between the second return pipe 9 and the second smoke exhaust line 19 is located upstream of the sixth valve 15, and the specific use method is the same as the use process of the third valve 12 and the fifth valve 14.
[0044] Preferably, the first valve 10 to the sixth valve 15 of the present embodiment are respectively automatic regulating valves, and the user can control the opening or closing of these valves remotely or in a control room without manually adjusting the valves.
[0045] Automatic control valves can be pneumatic control valves, electric control valves or hydraulic control valves, etc.
[0046] Preferably, in this embodiment, the number of the first heating furnaces 3 is four, and the number of the second heating furnaces 4 is three.
[0047] Of course, the number of the first heating furnaces 3 and the number of the second heating furnaces 4 of the present invention are not specifically limited, and the numbers of the two heating furnaces may be the same or different.
[0048] In some embodiments, an automatic regulating control device 21 for adjusting the flue gas flow rate is respectively provided on the flue gas outlet pipeline of each first heating furnace 3 and each second heating furnace 4. The automatic regulating control device 21 can adjust the flue gas flow rate and pressure of each heating furnace, and the flue gas of each furnace is led to the first inlet flue gas main 16 or the second inlet flue gas main 17.
[0049] The automatic regulating control device 21 of this embodiment can select an automatic regulating valve to adjust the exhaust flow rate of the smoke of each heating furnace through the automatic regulating valve.
[0050] Furthermore, a flow meter 22 and a pressure transmitter 23 are respectively provided on the smoke outlet pipeline of the first heating furnace 3 and / or the smoke outlet pipeline of the second heating furnace 4. The flow meter 22 can be used to monitor the flow rate of the smoke exhausted from each heating furnace, and the pressure transmitter 23 is used to monitor the pressure of the smoke exhausted from each heating furnace, so that the user can grasp the smoke condition of the smoke in time.
[0051] like Figure 1 As shown, the first smoke exhaust pipeline 18 and the second smoke exhaust pipeline 19 are respectively provided with induced draft fans 20. The induced draft fans 20 play a pressurizing role, and are used to allow the flue gas of the desulfurization and denitrification device to quickly enter the smoke exhaust pipeline and flow quickly in the smoke exhaust pipeline. The induced draft fan 20 is a device that generates negative pressure by rotating the impeller, and then extracts air from the system (equipment). Its structure belongs to the prior art and is not described in detail.
[0052] In some embodiments, the number of induced draft fans 20 on the first smoke exhaust line 18 and the number of induced draft fans 20 on the second smoke exhaust line 19 are both plural.
[0053] The air inlets of the induced draft fans 20 on the first smoke exhaust pipeline 18 are respectively connected to the smoke exhaust ports of the first desulfurization and denitrification device 1, and the air outlets are respectively connected to the air inlets of the first flue gas pipe 5. Multiple first induced draft fans 20 are arranged in parallel, which can facilitate the rapid introduction of flue gas in the first desulfurization and denitrification device into the first exhaust smoke pipe.
[0054] At the same time, the air inlets of the induced draft fans 20 on the second smoke exhaust pipeline 19 are respectively connected to the smoke exhaust ports of the second desulfurization and denitrification device 2, and the air outlets are respectively connected to the air inlets of the second flue gas pipe 6, and multiple second induced draft fans 20 are arranged in parallel.
[0055] The above description is intended to be illustrative rather than restrictive, and those skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure. Moreover, the above examples (or one or more of them) may be used in combination with each other, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations.
Claims
1. A smoke exhaust device, characterized in that: include: A first desulfurization and denitration device having a first inlet flue gas main; A second desulfurization and denitrification device having a second inlet flue gas main; A plurality of first heating furnaces and a plurality of second heating furnaces, wherein the smoke outlet pipeline of each of the first heating furnaces is respectively connected to the first inlet smoke main pipe; and the smoke outlet pipeline of each of the second heating furnaces is respectively connected to the second inlet smoke main pipe; A first flue gas chimney and a second flue gas chimney; the air inlet of the first flue gas chimney is connected to the exhaust port of the first desulfurization and denitration device through a first exhaust pipe; the air inlet of the second flue gas chimney is connected to the exhaust port of the second desulfurization and denitration device through a second exhaust pipe; A connecting pipe, connecting the first inlet smoke main pipe and the second inlet smoke main pipe, wherein a first valve and a second valve are provided on the connecting pipe at intervals; A first return pipe and a second return pipe, wherein the first end of the first return pipe is connected to the first smoke exhaust line, the first end of the second return pipe is connected to the second smoke exhaust line, the second end of the first return pipe and the second end of the second return pipe are respectively connected to the area between the first valve and the second valve on the connecting pipe, the first return pipe is provided with a third valve; the second return pipe is provided with a fourth valve.
2. A smoke exhaust device according to claim 1, characterized in that: A fifth valve is provided on the first smoke exhaust pipeline near the air inlet of the first smoke chimney; a sixth valve is provided on the second smoke exhaust pipeline near the air inlet of the second smoke chimney.
3. A smoke exhaust device according to claim 2, characterized in that: The first valve to the sixth valve are respectively automatic regulating valves.
4. A smoke exhaust device according to claim 1, characterized in that: The number of the first heating furnaces is four, and the number of the second heating furnaces is three.
5. A smoke exhaust device according to claim 1, characterized in that: The smoke outlet pipeline is provided with an automatic regulating control device for regulating the smoke flow rate.
6. A smoke exhaust device according to claim 5, characterized in that: The flue gas outlet pipeline is also provided with a flow meter and a pressure transmitter.
7. A smoke exhaust device according to claim 1, characterized in that: The first smoke exhaust pipeline and the second smoke exhaust pipeline are respectively provided with induced draft fans.
8. A smoke exhaust device according to claim 7, characterized in that: There are multiple induced draft fans, and the air inlets of the multiple induced draft fans are respectively connected to the smoke exhaust outlets of the corresponding desulfurization and denitrification devices, and the air outlets of the multiple induced draft fans are respectively connected to the air inlets of the corresponding flue gas chimneys.