CN216245615U - Negative pressure heating furnace air distribution system and flue gas denitration device - Google Patents
Negative pressure heating furnace air distribution system and flue gas denitration device Download PDFInfo
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- CN216245615U CN216245615U CN202122833515.8U CN202122833515U CN216245615U CN 216245615 U CN216245615 U CN 216245615U CN 202122833515 U CN202122833515 U CN 202122833515U CN 216245615 U CN216245615 U CN 216245615U
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Abstract
The utility model provides an air distribution system of a negative pressure heating furnace and a flue gas denitration device, wherein the air distribution system of the negative pressure heating furnace comprises a heating furnace and an air distribution assembly, the heating furnace comprises a hearth and a combustion chamber which are communicated with each other, the combustion chamber is used for combusting fuel and generating high-temperature flue gas, the high-temperature flue gas flows to the hearth from the combustion chamber, the air distribution assembly comprises an air distribution pipe and an adjusting valve, one end of the air distribution pipe is communicated with the atmosphere, the other end of the air distribution pipe is communicated with the hearth, the pressure in the hearth is smaller than the atmospheric pressure so as to extract air in the atmosphere through the air distribution pipe, the air and the high-temperature flue gas are mixed and then discharged from the hearth, and the adjusting valve is arranged on the air distribution pipe and is used for adjusting the flow of the air. Through changing traditional air distribution fan into governing valve, both reduced energy resource consumption, reduced equipment failure rate again and reduced and patrolled and examined the requirement, the running cost is low, and can set up the air distribution pipe of suitable size according to the negative pressure condition of heating furnace and required air distribution amount of wind, has guaranteed the homogeneity after air distribution air and the high temperature flue gas mix.
Description
Technical Field
The utility model relates to the technical field of flue gas treatment, in particular to an air distribution system of a negative pressure heating furnace and a flue gas denitration device.
Background
In the steel industry flue gas desulfurization denitration system, adopt desulfurization denitration combination formula flue gas purification technology usually, promptly "flue gas desulfurization + SCR denitration" technical route, because the flue gas temperature is lower after the desulfurization, and the reaction temperature that SCR denitration system needs is higher, need increase external negative pressure heating furnace before SCR denitration reactor and heat the flue gas usually. Meanwhile, in order to reduce the temperature of the flue gas at the outlet of the heating furnace and ensure the uniform mixing of the high-temperature flue gas of the heating furnace after entering the main denitration flue gas, the heating furnace is generally required to be provided with an air distribution fan, and the air in the atmosphere is extracted and sent into the heating furnace to be mixed with the high-temperature flue gas, so that the temperature of the flue gas at the outlet of the heating furnace is reduced, the service life and the operation stability of a heating furnace system are ensured, and the mixing uniformity of the flue gas of the heating furnace and the main denitration flue gas can be increased.
However, for the negative pressure heating furnace, the arrangement of the air distribution fan increases the investment and operation cost, and a reliable cut-off valve needs to be arranged in the air distribution pipe, so that the impeller of the standby air distribution fan is prevented from rotating and wearing under the negative pressure environment, the impeller needs to be overhauled frequently, and the manual maintenance cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an air distribution system of a negative pressure heating furnace and a flue gas denitration device, which can reduce energy consumption, reduce equipment failure rate and reduce inspection requirements, and simultaneously ensure the uniformity of mixed air and high-temperature flue gas.
In order to achieve the above purpose, the present invention provides an air distribution system for a negative pressure heating furnace, which comprises a heating furnace and an air distribution assembly, wherein the heating furnace comprises a hearth and a combustion chamber which are communicated with each other, the combustion chamber is used for combusting fuel and generating high temperature flue gas, the high temperature flue gas flows from the combustion chamber to the hearth, the air distribution assembly comprises an air distribution pipe and an adjusting valve, one end of the air distribution pipe is communicated with the atmosphere, the other end of the air distribution pipe is communicated with the hearth, the pressure in the hearth is less than the atmospheric pressure so as to extract air in the atmosphere through the air distribution pipe, the air and the high temperature flue gas are mixed and then discharged from the hearth, and the adjusting valve is arranged on the air distribution pipe and is used for adjusting the flow of the air.
Optionally, the pressure in the hearth is between-2000 Pa and-4000 Pa.
Optionally, the temperature of the air mixed with the high-temperature flue gas is between 500 ℃ and 800 ℃.
Optionally, the negative pressure heating furnace air distribution system further comprises a combustion fan, and the combustion fan is used for conveying air to the combustion chamber to support combustion.
Optionally, the fuel is coal gas.
Optionally, the number of the air distribution assemblies is multiple, and the air distribution pipes of the multiple air distribution assemblies are distributed along the circumferential direction of the combustion chamber.
Based on the above, the utility model also provides a flue gas denitration device, which is used for denitration of desulfurized flue gas and comprises an SCR denitration reactor, a GGH heat exchanger and the negative pressure heating furnace air distribution system, wherein the desulfurized flue gas is heated by heat exchange of the GGH heat exchanger, then is mixed with outlet flue gas discharged by the negative pressure heating furnace air distribution system and enters the SCR denitration reactor, the SCR denitration reactor is used for denitration treatment of the desulfurized flue gas and obtaining clean flue gas, and the clean flue gas is discharged after heat exchange and temperature reduction of the GGH heat exchanger.
Optionally, the flue gas denitration device further comprises an induced draft fan and a flue gas exhaust port, wherein the flue gas exhaust port is communicated with the GGH heat exchanger through the induced draft fan, so that the cooled clean flue gas is exhausted.
Optionally, the temperature of the desulfurized flue gas after heat exchange and temperature rise through the GGH heat exchanger is between 200 ℃ and 260 ℃.
Optionally, the temperature of the clean flue gas after being cooled by the GGH heat exchanger is between 90 ℃ and 120 ℃.
The utility model provides an air distribution system of a negative pressure heating furnace and a flue gas denitration device, wherein a traditional air distribution fan is replaced by an adjusting valve, the flow of air distribution can be adjusted by adjusting the opening degree of a valve of the adjusting valve, the energy consumption is reduced, the equipment failure rate is reduced, the inspection requirement is reduced, the operation cost is low, an air distribution pipe with proper size can be arranged according to the negative pressure condition of the heating furnace and the air distribution quantity required by the heating furnace, and the uniformity of the mixed air and the high-temperature flue gas is ensured.
Drawings
It will be appreciated by those skilled in the art that the drawings are provided for a better understanding of the utility model and do not constitute any limitation to the scope of the utility model. Wherein:
FIG. 1 is a schematic view of an air distribution system of a negative pressure heating furnace according to an embodiment of the present invention;
fig. 2 is a schematic view of a flue gas denitration apparatus provided in an embodiment of the present invention;
in the drawings:
1-hearth; 2-a combustion chamber; 3-air distribution pipes; 4-adjusting the valve; 5-combustion-supporting fan; 6-SCR denitration reactor; 7-GGH heat exchanger; 8-induced draft fan; 9-flue gas outlet.
Detailed Description
To further clarify the objects, advantages and features of the present invention, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.
As used in this application, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in this disclosure, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise. As used in this disclosure, the term "plurality" is generally employed in its sense including "at least one" unless the content clearly dictates otherwise. As used in this disclosure, the term "at least two" is generally employed in a sense including "two or more" unless the content clearly dictates otherwise. Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or at least two of the features.
Referring to fig. 1, fig. 1 is a schematic view of an air distribution system of a negative pressure heating furnace according to an embodiment of the present invention. The embodiment provides a negative pressure heating furnace air distribution system, which comprises a heating furnace and an air distribution assembly, wherein the heating furnace comprises a hearth 1 and a combustion chamber 2 which are communicated with each other, the combustion chamber 2 is used for combusting fuel and generating high-temperature flue gas, the high-temperature flue gas flows to the hearth 1 from the combustion chamber 2, the air distribution assembly comprises an air distribution pipe 3 and an adjusting valve 4, one end of the air distribution pipe 3 is communicated with the atmosphere, the other end of the air distribution pipe is communicated with the hearth 1, the pressure in the hearth 1 is smaller than the atmospheric pressure so as to extract air in the atmosphere through the air distribution pipe 3, the air and the high-temperature flue gas are mixed and then discharged from the hearth 1, and the adjusting valve 4 is arranged on the air distribution pipe 3 and used for adjusting the flow of the air.
According to the utility model, the traditional air distribution fan is replaced by the regulating valve 4, and then the air distribution flow can be regulated by regulating the valve opening of the regulating valve 4, so that the energy consumption is reduced, the equipment failure rate is reduced, the inspection requirement is lowered, the operation cost is low, the air distribution pipe 3 with a proper size can be arranged according to the negative pressure condition of the heating furnace and the air distribution air quantity required by the heating furnace, and the uniformity of the mixed air and the high-temperature flue gas is ensured.
In this embodiment, the pressure in the furnace chamber 1 is between-2000 Pa and-4000 Pa. Specifically, the hearth 1 is communicated with a pipeline of clean flue gas, and the pressure of the desulfurized flue gas is usually between-2500 Pa and-4000 Pa, so that the pressure in the hearth 1 is lower than the atmospheric pressure and is in a negative pressure state, so that air in the atmosphere enters the hearth 1 through the air distribution pipe 3 and is mixed with the high-temperature flue gas, the temperature of the outlet flue gas of the heating furnace is reduced, the service life and the operation stability of the heating furnace are ensured, and the mixing uniformity of the outlet flue gas of the heating furnace and the denitration main flue gas can be increased.
In this embodiment, the temperature of the mixed air and the high-temperature flue gas is between 500 ℃ and 800 ℃, and the design requirement that the temperature of the flue gas at the outlet of the furnace chamber 1 of the heating furnace is not higher than 800 ℃ is met.
In this embodiment, the regulating valve 4 may be a pneumatic regulating valve, an electric regulating valve, a hydraulic regulating valve, and the like, which is not limited in this application. In addition, the regulating valve 4 can be connected with a corresponding control system to realize the automatic control of the regulating valve 4, so that the proper valve opening degree can be set according to the negative pressure condition of the hearth 1 and the air distribution volume required by the heating furnace.
Preferably, the negative pressure heating furnace air distribution system further comprises a combustion fan 5, and the combustion fan 5 is used for delivering air to the combustion chamber 2 for combustion supporting.
In this embodiment, the fuel is coal gas. The coal gas is ignited and combusted in the combustion chamber 2, the combustion fan 5 introduces air for supporting combustion to generate high-temperature flue gas, and the high-temperature flue gas enters the hearth 1 due to the negative pressure suction force of the hearth 1 to be mixed with the air and then is discharged from the hearth 1.
Preferably, the number of the air distribution assemblies is multiple, and the air distribution pipes 3 of the multiple air distribution assemblies are distributed along the circumferential direction of the combustion chamber 2. Through setting up a plurality of air distribution assemblies, many sets of air distribution pipes 3 and governing valve 4 promptly, both guaranteed the valve and overhauld the needs, further guaranteed the homogeneity of air distribution again, and then strengthened negative pressure heating furnace air distribution system's performance and reliability.
Moreover, the air distribution pipes 3 of the plurality of air distribution assemblies may be uniformly distributed or non-uniformly distributed along the circumferential direction of the combustion chamber 2, which is not limited in this application.
Based on this, please refer to fig. 2, and fig. 2 is a schematic diagram of a flue gas denitration device according to an embodiment of the present invention. The utility model also provides a flue gas denitration device, which is used for denitration of desulfurized flue gas and comprises an SCR denitration reactor 6, a GGH heat exchanger 7 and the negative pressure heating furnace air distribution system, wherein the desulfurized flue gas is heated by heat exchange of the GGH heat exchanger 7 and then is mixed with outlet flue gas discharged by the negative pressure heating furnace air distribution system and enters the SCR denitration reactor 6, the SCR denitration reactor 6 is used for denitration treatment of the desulfurized flue gas and obtaining clean flue gas, and the clean flue gas is discharged after heat exchange and temperature reduction of the GGH heat exchanger 7.
In the flue gas denitration device provided by the utility model, the traditional air distribution fan in the air distribution system of the negative pressure heating furnace is replaced by the air distribution pipe 3 and the regulating valve 4, and the valve openings of the air distribution pipe 3 and the regulating valve 4 with proper sizes can be set according to the negative pressure condition of the heating furnace and the air distribution quantity required by the heating furnace, so that the energy consumption is reduced, the equipment failure rate is reduced, the inspection requirement is lowered, the operation cost is low, and the uniformity of the mixed air and the high-temperature flue gas is ensured.
Because the temperature of the desulfurized flue gas is low and the reaction temperature required by the SCR denitration reactor 6 is high, the desulfurized flue gas is discharged by the GGH heat exchanger 7 and then mixed with the outlet flue gas (i.e. the mixture of air and high-temperature flue gas) discharged by the negative-pressure heating furnace air distribution system so as to meet the reaction temperature required by the SCR denitration reactor 6. Simultaneously, the flue gas after desulfurization with clean flue gas passes through GGH heat exchanger 7, on the one hand the flue gas after desulfurization has preheated, has effectually utilized the waste heat of clean flue gas and has reduced the running cost of heating furnace, on the other hand clean flue gas has cooled down, reduces the requirement to follow-up equipment temperature resistance to and reduce the influence to the environment.
In this embodiment, the temperature of the desulfurized flue gas after heat exchange and temperature rise by the GGH heat exchanger 7 is between 200 ℃ and 260 ℃.
In this embodiment, the temperature of the clean flue gas after being cooled by the GGH heat exchanger 7 is between 90 ℃ and 120 ℃.
Preferably, the flue gas denitration device further comprises an induced draft fan 8 and a flue gas exhaust port 9, wherein the flue gas exhaust port 9 is communicated with the GGH heat exchanger 7 through the induced draft fan 8, so that the cooled clean flue gas is exhausted.
In summary, the embodiment of the utility model provides an air distribution system of a negative pressure heating furnace and a flue gas denitration device, wherein a traditional air distribution fan is replaced by an adjusting valve, and the flow of air distribution can be adjusted by adjusting the opening degree of the valve of the adjusting valve, so that the energy consumption is reduced, the equipment failure rate is reduced, the routing inspection requirement is reduced, the operation cost is low, an air distribution pipe with a proper size can be arranged according to the negative pressure condition of the heating furnace and the air distribution quantity required by the heating furnace, and the uniformity of the mixed air of the air distribution and the high-temperature flue gas is ensured.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. The negative pressure heating furnace air distribution system is characterized by comprising a heating furnace and an air distribution assembly, wherein the heating furnace comprises a hearth and a combustion chamber which are communicated with each other, the combustion chamber is used for combusting fuel and generating high-temperature flue gas, the high-temperature flue gas flows to the hearth from the combustion chamber, the air distribution assembly comprises an air distribution pipe and an adjusting valve, one end of the air distribution pipe is communicated with the atmosphere, the other end of the air distribution pipe is communicated with the hearth, the pressure in the hearth is smaller than the atmospheric pressure so as to extract air in the atmosphere through the air distribution pipe, the air and the high-temperature flue gas are mixed and then discharged from the hearth, and the adjusting valve is arranged on the air distribution pipe and is used for adjusting the flow of the air.
2. The negative pressure heating furnace air distribution system according to claim 1, wherein the pressure in the hearth is between-2000 Pa and-4000 Pa.
3. The negative pressure heating furnace air distribution system of claim 1, wherein the temperature of the air mixed with the high temperature flue gas is between 500 ℃ and 800 ℃.
4. The negative pressure heating furnace air distribution system of claim 1, further comprising a combustion fan for delivering air to the combustion chamber for combustion supporting.
5. The negative pressure heating furnace air distribution system of claim 1, wherein the fuel is coal gas.
6. The negative pressure heating furnace air distribution system of claim 5, wherein the number of the air distribution assemblies is multiple, and the air distribution pipes of the multiple air distribution assemblies are distributed along the circumferential direction of the combustion chamber.
7. A flue gas denitration device is used for denitration of desulfurized flue gas and is characterized by comprising an SCR denitration reactor, a GGH heat exchanger and the negative pressure heating furnace air distribution system as set forth in any one of claims 1 to 6, wherein the desulfurized flue gas is heated through heat exchange of the GGH heat exchanger and then mixed with outlet flue gas discharged from the negative pressure heating furnace air distribution system and enters the SCR denitration reactor, the SCR denitration reactor is used for carrying out denitration treatment on the desulfurized flue gas and obtaining clean flue gas meeting the emission requirement, and the clean flue gas is discharged after heat exchange and temperature reduction of the GGH heat exchanger.
8. The flue gas denitration device of claim 7, further comprising an induced draft fan and a flue gas exhaust port, wherein the flue gas exhaust port is communicated with the GGH heat exchanger through the induced draft fan so as to exhaust the cooled clean flue gas.
9. The flue gas denitration device of claim 7, wherein the temperature of the desulfurized flue gas after heat exchange and temperature rise by the GGH heat exchanger is between 200 ℃ and 260 ℃.
10. The flue gas denitration device of claim 7, wherein the temperature of the clean flue gas after being cooled by the GGH heat exchanger is between 90 ℃ and 120 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122833515.8U CN216245615U (en) | 2021-11-18 | 2021-11-18 | Negative pressure heating furnace air distribution system and flue gas denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122833515.8U CN216245615U (en) | 2021-11-18 | 2021-11-18 | Negative pressure heating furnace air distribution system and flue gas denitration device |
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| CN216245615U true CN216245615U (en) | 2022-04-08 |
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| CN202122833515.8U Active CN216245615U (en) | 2021-11-18 | 2021-11-18 | Negative pressure heating furnace air distribution system and flue gas denitration device |
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