CN212274249U - Denitration flue gas waste heat utilization system - Google Patents
Denitration flue gas waste heat utilization system Download PDFInfo
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- CN212274249U CN212274249U CN202020698807.8U CN202020698807U CN212274249U CN 212274249 U CN212274249 U CN 212274249U CN 202020698807 U CN202020698807 U CN 202020698807U CN 212274249 U CN212274249 U CN 212274249U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses a denitration flue gas waste heat utilization system, include: the head part of the denitration tower is connected with a high-temperature flue gas source, and the tail part of the denitration tower is provided with a booster fan; the desulfurization tower is connected with a booster fan at the tail part of the denitration tower through a flue, and a first flue heat exchanger and a second flue heat exchanger are sequentially arranged on the flue; the blast furnace gas pipeline is communicated with the first flue heat exchanger, so that the blast furnace gas and the flue gas exchange heat in the first flue heat exchanger; the combustion-supporting gas pipeline is communicated with the second flue heat exchanger, so that the combustion-supporting gas and the flue gas exchange heat in the second flue heat exchanger; the hot blast stove burner is respectively connected with the blast furnace gas pipeline and the combustion-supporting gas pipeline.
Description
Technical Field
The utility model belongs to the technical field of flue gas purification, concretely relates to denitration flue gas waste heat utilization system.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
With the increasingly strict national requirements on environmental protection, the SCR denitration facility of the sintering machine in the steel industry becomes the first choice process of the sintering denitration technology. The process comprises the steps of firstly carrying out flue gas heat exchange through GGH, heating sintering flue gas to 300-320 ℃ through a hot blast stove by the flue gas after heat exchange, then carrying out denitration through a selective catalytic reduction technology, and then cooling by using a GGH heat exchange device, wherein after the flue gas meets the cooling requirement, the temperature of the flue gas is generally about 120 ℃ and then enters a subsequent desulfurization system. The heat recovered by the GGH heat exchange device is generally used for hot water heating, domestic water and the like, and the utilization value is low.
In addition, the hot blast stove generally directly adopts natural air with the pressure of 10-20KPa and the temperature of below 30 ℃ as combustion-supporting air, and mainly has the following defects: 1. the blast furnace gas consumption of the hot blast furnace system is large, and the operation is not economical; 2. the ignition of the hot blast stove is difficult, and multiple times of ignition are required to succeed under common conditions. 3. The blast furnace gas has high water and tar impurity content, and water and tar are evaporated in a burner when the blast furnace gas is combusted, so that the burner of the blast furnace is corroded, coked and damaged.
Disclosure of Invention
In order to solve the technical problem that exists among the prior art, the utility model aims at providing a denitration flue gas waste heat utilization system.
In order to realize the purpose of the utility model, one or more embodiments of the utility model disclose the following technical solutions:
a denitration flue gas waste heat utilization system comprises:
the head part of the denitration tower is connected with a high-temperature flue gas source, and the tail part of the denitration tower is provided with a booster fan;
the desulfurization tower is connected with a booster fan at the tail part of the denitration tower through a flue, a first flue heat exchanger and a second flue heat exchanger are sequentially arranged on the flue, and the second flue heat exchanger is positioned at the downstream of the first flue heat exchanger;
the blast furnace gas pipeline is communicated with the first flue heat exchanger, so that the blast furnace gas and the flue gas exchange heat in the first flue heat exchanger;
the combustion-supporting gas pipeline is communicated with the second flue heat exchanger, so that the combustion-supporting gas and the flue gas exchange heat in the second flue heat exchanger;
the hot blast stove burner is respectively connected with the blast furnace gas pipeline, the combustion-supporting gas pipeline and the fuel gas pipeline.
Compared with the prior art, the utility model discloses an above one or more technical scheme have gained following beneficial effect:
the blast furnace gas is heated by the first flue heat exchanger, the combustion-supporting gas is heated by the second flue heat exchanger, and the denitrated flue gas can heat the blast furnace gas and the combustion-supporting gas to a higher temperature and then enters the combustor to be ignited, so that the ignition easiness of the hot blast furnace can be improved; on the other hand, the theoretical combustion temperature can be effectively improved, so that the temperature in the combustor is further improved, tar and moisture in blast furnace gas are gasified, the coking corrosion of the combustor can be effectively slowed down, and a better energy-saving effect is achieved.
Because the combustion-supporting air and the blast furnace gas have higher flowing speeds, in order to improve the heating efficiency of the combustion-supporting air and the blast furnace gas, the booster fan is additionally arranged at the tail part of the denitration tower, so that the flowing speed of the flue gas can be improved, and the heating speeds of the combustion-supporting air and the blast furnace gas are further improved.
The flue gas temperature after the heat transfer reduces, can directly carry out the desulfurization, need not to set up gaseous heat transfer device again and cools down the flue gas, can effectively reduce investment cost.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
The system comprises a denitration tower, a booster fan, a blast furnace gas pipeline, a first flue heat exchanger, a second flue heat exchanger, a combustion-supporting gas pipeline, a desulfurization tower, a gas pipeline, a hot blast stove and a booster fan, wherein the denitration tower comprises 1, the booster fan 2, the blast furnace gas pipeline 3, the first flue heat exchanger, the second flue heat exchanger, 6, the combustion-supporting gas pipeline 7, the desulfurization tower 8, the gas pipeline 9.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
A denitration flue gas waste heat utilization system comprises:
the head part of the denitration tower is connected with a high-temperature flue gas source, and the tail part of the denitration tower is provided with a booster fan;
the desulfurization tower is connected with a booster fan at the tail part of the denitration tower through a flue, and a first flue heat exchanger and a second flue heat exchanger are sequentially arranged on the flue;
the blast furnace gas pipeline is communicated with the first flue heat exchanger, so that the blast furnace gas and the flue gas exchange heat in the first flue heat exchanger;
the combustion-supporting gas pipeline is communicated with the second flue heat exchanger, so that the combustion-supporting gas and the flue gas exchange heat in the second flue heat exchanger;
the hot blast stove burner is respectively connected with the blast furnace gas pipeline and the combustion-supporting gas pipeline.
In some embodiments, the first flue heat exchanger and the second flue heat exchanger are of the same structure, and each of the first flue heat exchanger and the second flue heat exchanger comprises a shell and a plurality of tubes, two opposite surfaces of the shell are open and are coaxially installed with the flue, and the plurality of tubes are installed inside the shell and are perpendicular to the flow direction of the flue gas;
the pipe body forms a flow passage of combustion-supporting gas or fuel gas.
The flue gas and the combustion-supporting gas/fuel gas form a dividing wall type heat exchange, and the heat exchange efficiency can be effectively improved.
In some embodiments, the first flue heat exchanger and the second flue heat exchanger are identical in structure and each comprise a shell and a plurality of tubes, the tubes are mounted in the shell, the flue is communicated with the tube side, and the combustion-supporting gas pipeline and the fuel gas pipeline are communicated with the shell side.
Further, the tube body is provided with fins.
The fins can effectively increase the heat exchange area so as to improve the heating efficiency of the combustion-supporting gas and the blast furnace gas.
Furthermore, the volume ratio of the pipe body to the shell is 1: 1.5-2.
In some embodiments, the combustion-supporting air duct is provided with two branch air inlet ducts, namely a first branch air inlet duct and a second branch air inlet duct, and a pump is arranged on each branch air inlet duct.
The combustion-supporting gas is supplied through the two pumps, so that the flow of the combustion-supporting gas can be ensured.
In some embodiments, the second stack heat exchanger is located downstream of the first stack heat exchanger. The temperature of the flue gas flowing through the first flue heat exchanger is higher, the heating effect on the blast furnace gas is better, the moisture and tar in the blast furnace gas can be better gasified, and the coking in the combustor is reduced.
In some embodiments, the denitration tower is an SCR denitration tower.
Further, 1-3 catalyst layers are arranged in the denitration tower.
In some embodiments, the gas stove further comprises a gas pipeline, and the gas pipeline is connected with the hot blast stove burner.
Natural gas is introduced into the gas pipeline to supplement the blast furnace gas so as to ensure the stable operation of the burner of the hot blast furnace.
Example 1
As shown in fig. 1, a denitration flue gas waste heat utilization system includes:
the head part of the denitration tower is connected with a high-temperature flue gas source, and the tail part of the denitration tower is provided with a booster fan;
the desulfurization tower is connected with a booster fan at the tail part of the denitration tower through a flue, and a first flue heat exchanger and a second flue heat exchanger are sequentially arranged on the flue;
the blast furnace gas pipeline is communicated with the first flue heat exchanger, so that the blast furnace gas and the flue gas exchange heat in the first flue heat exchanger;
the combustion-supporting gas pipeline is communicated with the second flue heat exchanger, so that the combustion-supporting gas and the flue gas exchange heat in the second flue heat exchanger;
the hot blast stove burner is respectively connected with the blast furnace gas pipeline, the combustion-supporting gas pipeline and the fuel gas pipeline.
The first flue heat exchanger and the second flue heat exchanger are of the same structure and respectively comprise a shell and a plurality of pipe bodies, two opposite surfaces of the shell are open and are coaxially arranged with the flue, and the plurality of pipe bodies are arranged in the shell and are vertical to the flowing direction of flue gas; the pipe body forms a flow passage of combustion-supporting gas or fuel gas. The flue gas and the combustion-supporting gas/fuel gas form a dividing wall type heat exchange, so that the heat exchange efficiency can be effectively improved, and the pipe body is provided with fins. The volume ratio of the pipe body to the shell is 1: 2.
The combustion-supporting air pipe is provided with two branch air inlet pipes, namely a first branch air inlet pipe and a second branch air inlet pipe, and the two branch air inlet pipes are provided with pumps. The combustion-supporting gas is supplied through the two pumps, so that the flow of the combustion-supporting gas can be ensured.
The second stack heat exchanger is located downstream of the first stack heat exchanger. The temperature of the flue gas flowing through the first flue heat exchanger is higher, the heating effect on the blast furnace gas is better, the moisture and tar in the blast furnace gas can be better gasified, and the coking in the combustor is reduced.
The denitration tower is an SCR denitration tower, and 3 catalyst layers are arranged in the denitration tower.
Through the flue type heat exchanger after increasing the denitration, heat combustion-supporting wind and blast furnace gas respectively, be favorable to the flue gas cooling after the denitration in order to increase the desulfurization efficiency of rear end and reduce the evaporation of moisture when desulfurization, more be favorable to whole system's energy-conserving steady operation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a denitration flue gas waste heat utilization system which characterized in that: the method comprises the following steps:
the head part of the denitration tower is connected with a high-temperature flue gas source, and the tail part of the denitration tower is provided with a booster fan;
the desulfurization tower is connected with a booster fan at the tail part of the denitration tower through a flue, and a first flue heat exchanger and a second flue heat exchanger are sequentially arranged on the flue;
the blast furnace gas pipeline is communicated with the first flue heat exchanger, so that the blast furnace gas and the flue gas exchange heat in the first flue heat exchanger;
the combustion-supporting gas pipeline is communicated with the second flue heat exchanger, so that the combustion-supporting gas and the flue gas exchange heat in the second flue heat exchanger;
the hot blast stove burner is respectively connected with the blast furnace gas pipeline and the combustion-supporting gas pipeline.
2. The denitration flue gas waste heat utilization system of claim 1, characterized in that: the first flue heat exchanger and the second flue heat exchanger are of the same structure and respectively comprise a shell and a plurality of pipe bodies, two opposite surfaces of the shell are open and are coaxially installed with the flue, and the plurality of pipe bodies are installed in the shell and are vertical to the flowing direction of flue gas;
the pipe body forms a flow passage of combustion-supporting gas or fuel gas.
3. The denitration flue gas waste heat utilization system of claim 1, characterized in that: the first flue heat exchanger and the second flue heat exchanger are identical in structure and respectively comprise a shell and a plurality of tubes, the tubes are installed in the shell, the flue is communicated with the tube side, and the combustion-supporting gas pipeline and the fuel gas pipeline are communicated with the shell side.
4. The denitration flue gas waste heat utilization system of claim 2 or 3, characterized in that: the tube body is provided with fins.
5. The denitration flue gas waste heat utilization system of claim 2 or 3, characterized in that: the volume ratio of the pipe body to the shell is 1: 1.5-2.
6. The denitration flue gas waste heat utilization system of claim 1, characterized in that: the combustion-supporting air pipeline is provided with two branch air inlet pipelines which are respectively a first branch air inlet pipeline and a second branch air inlet pipeline, and the two branch air inlet pipelines are provided with pumps.
7. The denitration flue gas waste heat utilization system of claim 1, characterized in that: the second stack heat exchanger is located downstream of the first stack heat exchanger.
8. The denitration flue gas waste heat utilization system of claim 1, characterized in that: the denitration tower is an SCR denitration tower.
9. The denitration flue gas waste heat utilization system of claim 8, characterized in that: and 1-3 catalyst layers are arranged in the denitration tower.
10. The denitration flue gas waste heat utilization system of claim 1, characterized in that: the hot blast stove further comprises a gas pipeline, and the gas pipeline is connected with the hot blast stove burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020698807.8U CN212274249U (en) | 2020-04-29 | 2020-04-29 | Denitration flue gas waste heat utilization system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020698807.8U CN212274249U (en) | 2020-04-29 | 2020-04-29 | Denitration flue gas waste heat utilization system |
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| Publication Number | Publication Date |
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| CN212274249U true CN212274249U (en) | 2021-01-01 |
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| CN202020698807.8U Active CN212274249U (en) | 2020-04-29 | 2020-04-29 | Denitration flue gas waste heat utilization system |
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| CN (1) | CN212274249U (en) |
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- 2020-04-29 CN CN202020698807.8U patent/CN212274249U/en active Active
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