CN220999696U - Energy-saving type system for heating pulverized coal by flue gas of blast furnace hot blast stove - Google Patents
Energy-saving type system for heating pulverized coal by flue gas of blast furnace hot blast stove Download PDFInfo
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- CN220999696U CN220999696U CN202322704965.6U CN202322704965U CN220999696U CN 220999696 U CN220999696 U CN 220999696U CN 202322704965 U CN202322704965 U CN 202322704965U CN 220999696 U CN220999696 U CN 220999696U
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- pulverized coal
- flue gas
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- heat
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- 239000003245 coal Substances 0.000 title claims abstract description 116
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 239000003546 flue gas Substances 0.000 title claims abstract description 35
- 238000010438 heat treatment Methods 0.000 title claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 27
- 239000007924 injection Substances 0.000 claims abstract description 27
- 239000002817 coal dust Substances 0.000 claims description 4
- 239000002918 waste heat Substances 0.000 abstract description 12
- 239000000243 solution Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000000843 powder Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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- Manufacture Of Iron (AREA)
Abstract
The utility model discloses a flue gas pulverized coal heating system of an energy-saving blast furnace hot blast stove, which comprises a heat conduction oil heat exchanger, a pulverized coal heater, a heat conduction oil circulating device and a pulverized coal injection device, wherein the heat conduction oil heat exchanger is arranged on the flue gas of the energy-saving blast furnace hot blast stove; the heat conduction oil heat exchanger comprises a shell and a heat exchange tube arranged in the shell, and the inner cavity of the shell is communicated with a flue gas pipeline of the hot blast stove; the pulverized coal heater is a shell-and-tube heater, the tube side is connected with the pulverized coal injection device, and the shell side is connected with the heat conduction oil circulation device. According to the utility model, the heat conduction oil heat exchanger is adopted to recycle the waste heat of the high-temperature flue gas of the hot blast stove, so that the high operation temperature of the heat transfer medium can be obtained under the normal pressure operation condition, the temperature can be conveniently controlled, no other heat loss occurs, and the heat efficiency is high.
Description
Technical Field
The utility model relates to the technical field of metallurgical iron making, in particular to a system for heating pulverized coal by flue gas of an energy-saving blast furnace hot blast stove.
Background
In the technical field of metallurgical iron making, the waste heat utilization of the flue gas of the blast furnace hot blast stove plays an important role in energy saving and consumption reduction. For example: heating, power generation, drying of blast furnace gas and the like are performed through waste heat recovery.
Chinese patent CN 110129497A discloses a series preheating process and system for blast furnace coal dust injection and air/gas of hot blast stove, wherein the high temperature flue gas of hot blast stove is first used for coal dust preheating by coal dust preheating system, and the flue gas after heat exchange is then used for air and/or gas preheating by air/gas preheating system, so as to realize the graded utilization of the waste heat of high temperature flue gas. This solution has the following problems:
The pulverized coal is directly preheated by utilizing high-temperature flue gas of the hot blast stove, the preheating temperature is not easy to control, and the waste heat utilization efficiency is low.
In view of this, there is a need for improvements in the existing pulverized coal heating systems for flue gas from blast furnace stoves to effectively control temperature and increase waste heat utilization efficiency.
Disclosure of utility model
Aiming at the defects, the utility model aims to provide an energy-saving system for heating pulverized coal by flue gas of a blast furnace hot blast stove, so as to solve the problems of difficult control of preheating temperature and low waste heat utilization efficiency in the prior art.
Therefore, the utility model provides an energy-saving system for heating pulverized coal by flue gas of a blast furnace hot blast stove, which comprises a heat transfer oil heat exchanger, a pulverized coal heater, a heat transfer oil circulating device and a pulverized coal injection device,
The heat conduction oil heat exchanger comprises a shell and a heat exchange tube arranged in the shell, and the inner cavity of the shell is communicated with a flue gas pipeline of the hot blast stove;
the pulverized coal heater is a shell-and-tube heater, the tube side is connected with the pulverized coal injection device, and the shell side is connected with the heat conduction oil circulation device.
In the above technical scheme, preferably, the tube side input end of the pulverized coal heater is connected with a pulverized coal injection pipeline of the coal injection workshop through a first coal conveying pipeline, the tube side output end is connected with a pulverized coal input port of the blast furnace and a pulverized coal return port of the coal injection workshop through a second coal conveying pipeline, and the first coal conveying pipeline and the second coal conveying pipeline are also respectively provided with a pulverized coal flowmeter.
In the above technical solution, preferably, the heat-conducting oil circulation device includes an oil pump, a filter and an oil storage tank, an outlet of the oil pump is connected with an input end of the heat exchange tube through a first pipeline, an output end of the heat exchange tube is connected with a shell side input end of the pulverized coal heater, a shell side output end of the pulverized coal heater is connected with the filter through a second pipeline, an output port of the filter is connected with an inlet of the oil pump, and the oil storage tank is connected in parallel between the first pipeline and the second pipeline.
In the above technical solution, preferably, the second pipe is further provided with an expansion tank.
In the above technical scheme, preferably, a pulverized coal emergency conveying pipeline is further provided, one end of the pulverized coal emergency conveying pipeline is connected with the first coal conveying pipeline, and the other end of the pulverized coal emergency conveying pipeline is connected with the second coal conveying pipeline.
According to the technical scheme, the system for heating the pulverized coal by the flue gas of the energy-saving blast furnace hot blast stove solves the problems that the temperature is not easy to control and the thermal efficiency is low in the prior art. Compared with the prior art, the utility model has the following beneficial effects:
The heat transfer oil heat exchanger is adopted to recycle the waste heat of the high-temperature flue gas of the hot blast stove, so that the operation temperature of a heat transfer medium can be very high under the normal pressure operation condition, the temperature can be conveniently controlled, no other heat loss occurs, and the heat efficiency is high.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following description will make brief description and illustrations of the drawings used in the description of the embodiments of the present utility model or the prior art. It is obvious that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic diagram of a pulverized coal heating system by flue gas of an energy-saving blast furnace hot blast stove.
In the figure, the correspondence of the components is as follows:
A heat transfer oil heat exchanger 10, a pulverized coal heater 20, a coal injection workshop 30, a blast furnace 40 and a hot blast stove 50;
A housing 11, a heat exchange tube 12;
A pulverized coal flow meter 41, an expansion tank 42;
an oil pump 51, a filter 52, and an oil tank 53.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model, and it is apparent that the embodiments described below are only some embodiments of the present utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without making any inventive effort are intended to fall within the scope of the present utility model.
In order to make the explanation and the description of the technical solution and the implementation of the present utility model clearer, several preferred embodiments for implementing the technical solution of the present utility model are described below.
In this document, the terms "inner, outer", "front, rear", and "left, right" are expressions based on the usage status of the product, and it is apparent that the usage of the corresponding terms does not limit the scope of the present solution.
Referring to fig. 1, fig. 1 is a schematic diagram of a pulverized coal heating system using flue gas of an energy-saving blast furnace hot blast stove provided by the utility model.
As shown in fig. 1, the utility model provides an energy-saving system for heating pulverized coal by flue gas of a blast furnace hot blast stove, which comprises a heat conduction oil heat exchanger 10, a pulverized coal heater 20, a heat conduction oil circulation device and a pulverized coal injection device. Wherein the conduction oil circulation device is used for realizing circulation flow of conduction oil in the conduction oil heat exchanger 10. The pulverized coal injection device is used for heating pulverized coal output from the coal injection workshop 30 by the pulverized coal heater 20 and outputting the heated pulverized coal to the blast furnace 40.
The heat conduction oil heat exchanger 10 comprises a shell 11 and a heat exchange tube 12 arranged in the shell 11, wherein the inner cavity of the shell 11 is communicated with a flue gas pipeline of the hot blast stove 50, and the heat conduction oil in the heat exchange tube 12 is heated by high-temperature flue gas of the hot blast stove 50.
The pulverized coal heater 20 is a shell-and-tube heater, the tube side is connected with a pulverized coal injection device, and the shell side is connected with a heat conduction oil circulation device. The tube side input end of the pulverized coal heater 20 is connected with a pulverized coal injection pipeline of the coal injection workshop through a first coal conveying pipeline, and the tube side output end is connected with a pulverized coal input port of the blast furnace and a pulverized coal return port of the coal injection workshop through a second coal conveying pipeline. The first coal conveying pipeline and the second coal conveying pipeline are respectively provided with a coal powder flowmeter 41 for monitoring the flow of the injected coal powder. And a coal powder distributor 42 is further arranged at one end, close to the blast furnace, of the first coal conveying pipeline and is used for uniformly mixing high-pressure nitrogen and coal powder and distributing the mixture to a coal injection main pipe of the blast furnace so as to realize high-temperature coal powder injection.
The heat conduction oil circulation device comprises an oil pump 51, a filter 52 and an oil storage tank 53, wherein an outlet of the oil pump 51 is connected with an input end of the heat exchange tube 12 through a first pipeline, an output end of the heat exchange tube 12 is connected with a shell side input end of the pulverized coal heater 20, a shell side output end of the pulverized coal heater 20 is connected with the filter 52 through a second pipeline, an output port of the filter 52 is connected with an inlet of the oil pump 51, and the oil storage tank 53 is connected between the first pipeline and the second pipeline in parallel and is used for supplementing heat conduction oil.
The second pipe is also provided with an expansion tank 43 for balancing the quantity and pressure of the heat transfer oil, and when the quantity of oil is insufficient, the heat transfer oil is replenished to the pipe through an oil storage tank 53.
The pulverized coal injection device is further provided with a pulverized coal emergency conveying pipeline, one end of the pulverized coal emergency conveying pipeline is connected with the first coal conveying pipeline, and the other end of the pulverized coal emergency conveying pipeline is connected with the second coal conveying pipeline, and the pulverized coal emergency conveying pipeline is used for directly supplying pulverized coal to the blast furnace when the pulverized coal heater 20 fails.
And control valves are respectively arranged in the heat conduction oil circulation device and the pulverized coal injection device and on the pipelines and used for controlling heat conduction oil circulation and pulverized coal injection conveying, and the heat conduction oil circulation device and the pulverized coal injection conveying are mature prior art and are not described in detail herein.
The utility model provides an energy-saving system for heating pulverized coal by flue gas of a blast furnace hot blast stove, which comprises the following working processes:
The heat exchange tube of the heat conduction oil heat exchanger is arranged in a flue gas pipeline of the hot blast stove, heat conduction oil flows through the heat exchange tube to be heated to the working temperature by high-temperature flue gas in the flue gas pipeline of the hot blast stove and then is sent to the pulverized coal heater, the heat conduction oil enters the shell pass part of the pulverized coal heater from the inlet of the pulverized coal heater and flows reversely with pulverized coal flowing in the tube pass, the pulverized coal is heated, the heated pulverized coal is sent to a blast furnace, and the heat conduction oil flows back to an oil storage tank or a pump area after flowing out and then enters the next working cycle again.
By combining the description of the specific embodiments, the flue gas heating pulverized coal system of the energy-saving blast furnace hot blast stove provided by the utility model has the following advantages compared with the prior art:
The scheme of the utility model organically combines the heat exchange of the waste heat of the blast furnace and the heating of the pulverized coal, thereby not only utilizing the waste heat of the blast furnace to save energy and reduce consumption, but also realizing the heating of the pulverized coal at normal temperature to 300 ℃, improving the combustion efficiency of the pulverized coal and reducing the fuel ratio.
The heat transfer oil heat exchanger 10 is used for recovering the waste heat of the high-temperature flue gas of the hot blast stove, so that the high operating temperature of the heat transfer medium can be obtained under the normal pressure operating condition, the temperature can be conveniently controlled, and the utilization efficiency of the waste heat is improved.
In addition, the conduction oil system is a low-pressure closed forced circulation operation system, so that heat dissipation loss on the surfaces of pipeline equipment in the system is eliminated, no other heat loss occurs in the system, and the heat efficiency is high.
Finally, it is also noted that the terms "comprises," "comprising," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The present utility model is not limited to the above-mentioned preferred embodiments, and any person who can learn the structural changes made under the teaching of the present utility model can fall within the scope of the present utility model if the present utility model has the same or similar technical solutions.
Claims (5)
1. The system for heating pulverized coal by flue gas of energy-saving blast furnace hot blast stove comprises a heat transfer oil heat exchanger, a pulverized coal heater, a heat transfer oil circulating device and a pulverized coal injection device, and is characterized in that,
The heat conduction oil heat exchanger comprises a shell and a heat exchange tube arranged in the shell, and the inner cavity of the shell is communicated with a flue gas pipeline of the hot blast stove;
the pulverized coal heater is a shell-and-tube heater, the tube side is connected with the pulverized coal injection device, and the shell side is connected with the heat conduction oil circulation device.
2. The system for heating pulverized coal by flue gas of the energy-saving blast furnace hot blast stove according to claim 1, wherein the tube side input end of the pulverized coal heater is connected with a pulverized coal injection pipeline of a coal injection workshop through a first coal conveying pipeline, the tube side output end is connected with a pulverized coal input port of the blast furnace and a pulverized coal return port of the coal injection workshop through a second coal conveying pipeline, and the first coal conveying pipeline and the second coal conveying pipeline are respectively provided with a pulverized coal flowmeter.
3. The energy-saving type blast furnace hot blast stove flue gas heating pulverized coal system according to claim 1, wherein the heat conducting oil circulating device comprises an oil pump, a filter and an oil storage tank, an outlet of the oil pump is connected with an input end of the heat exchange tube through a first pipeline, an output end of the heat exchange tube is connected with a shell side input end of the pulverized coal heater, a shell side output end of the pulverized coal heater is connected with the filter through a second pipeline, an output port of the filter is connected with an inlet of the oil pump, and the oil storage tank is connected between the first pipeline and the second pipeline in parallel.
4. An energy saving blast furnace hot blast stove flue gas heating coal dust system as claimed in claim 3, wherein the second pipeline is further provided with an expansion tank.
5. The system for heating pulverized coal by using flue gas of an energy-saving blast furnace hot blast stove according to claim 2, wherein the system is further provided with a pulverized coal emergency conveying pipeline, one end of the pipeline is connected with the first coal conveying pipeline, and the other end of the pipeline is connected with the second coal conveying pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322704965.6U CN220999696U (en) | 2023-10-09 | 2023-10-09 | Energy-saving type system for heating pulverized coal by flue gas of blast furnace hot blast stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322704965.6U CN220999696U (en) | 2023-10-09 | 2023-10-09 | Energy-saving type system for heating pulverized coal by flue gas of blast furnace hot blast stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220999696U true CN220999696U (en) | 2024-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322704965.6U Active CN220999696U (en) | 2023-10-09 | 2023-10-09 | Energy-saving type system for heating pulverized coal by flue gas of blast furnace hot blast stove |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220999696U (en) |
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2023
- 2023-10-09 CN CN202322704965.6U patent/CN220999696U/en active Active
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