Blast furnace gas heating system

Abstract

The utility model belongs to the field of blast furnace equipment, and relates to a blast furnace gas heating system which comprises a valve of a blast furnace gas pipeline, a cyclone dust collector, a flowmeter, a thermometer, a valve of a flue gas pipeline and a heat exchanger, and a heating gas source is taken from flue gas of a hot blast stove. The system is arranged between a blast furnace gravity dust collector and dry dust collection and serves as a bypass of a normal gas pipeline. When the blast furnace gas is low in temperature and needs to be heated, the flue gas adjusting valve on the hot blast stove flue gas pipeline is opened, high-temperature hot blast stove flue gas enters the heat exchanger, meanwhile, the gas adjusting valve on the heating system pipeline is opened, and the blast furnace gas flows through the heated heat exchanger after passing through the cyclone dust collector, so that the blast furnace gas is heated and then flows to the dry dedusting system. Heated hot-blast stove smoke flows back to the hot-blast stove waste gas pipeline and is discharged through a chimney. Blast furnace gas is heated through hot blast stove flue gas, low-temperature gas is prevented from directly entering a dry-method system, cloth bag hardening is prevented, normal work of the dry-method system is ensured, and the operation stability of a blast furnace system is improved.

Description

Technical Field

[0001] The utility model belongs to the field of blast furnace equipment and relates to a blast furnace gas heating system. Background Art

[0002] Blast furnaces are crucial equipment in the metallurgical industry, and the gas temperature generated during their operation is a crucial process parameter. As blast furnace raw material and fuel conditions continue to deteriorate, the top temperature of some blast furnaces is declining. This is particularly true in some overseas blast furnaces, where the top gas temperature often falls below 100°C due to the high oxygen enrichment ratio. When the blast furnace gas reaches the dry dust removal system, if the temperature is below 80°C, condensation easily forms, leading to compaction and malfunction of the bag filter. This not only impacts stable blast furnace production but also potentially causes environmental pollution and energy waste.

[0003] Traditional blast furnace gas treatment processes typically use gravity dust collectors and dry dust collectors to remove dust from blast furnace gas. However, when the gas temperature is too low, traditional dust removal methods are unable to meet production needs. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a blast furnace gas heating system, which aims to increase the temperature of blast furnace gas and prevent condensation and hardening, thereby maintaining the normal operation of the dry dust removal system and ensuring stable production of the blast furnace.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a blast furnace gas heating system, which is arranged between the blast furnace, the gravity dust collector and the dry dust collector. The blast furnace is connected to the gravity dust collector through a downcomer, and the gravity dust collector is connected to the dry dust collector through a first gas pipeline, including a second gas pipeline arranged in parallel with the first gas pipeline, a cyclone dust collector connected to the second gas pipeline, and a heat exchanger connected to the cyclone dust collector through a third gas pipeline, and the heat exchanger outlet is connected to the dry dust collector through a fourth gas pipeline; the heating gas source is taken from the hot blast furnace flue gas, and the hot blast furnace flue gas is connected to the waste heat recovery area through the hot blast furnace flue gas pipeline, and the waste heat recovery area is connected to the chimney through the flue gas return chimney pipeline; the heat exchanger is connected to the hot blast furnace flue gas pipeline through the heat exchanger flue gas inlet front pipeline, and the hot blast furnace flue gas is connected to the chimney through the heat exchanger flue gas outlet rear pipeline after passing through the heat exchanger.

[0006] Optionally, a first gas flow regulating valve is provided on the first gas pipeline to control the gas flow in the pipeline; a first thermometer and a second thermometer are respectively provided near the gravity dust collector outlet and the dry dust collector inlet to measure the blast furnace gas temperature at the gravity dust collector outlet and the blast furnace gas temperature at the dry dust collector inlet.

[0007] Optionally, the second gas pipeline is a bypass pipeline of the first gas pipeline; the second gas pipeline is provided with a second gas flow regulating valve and a first flow meter for adjusting the gas flow of the pipeline and measuring the gas flow of the pipeline; the cyclone dust collector on the second gas pipeline is used to reduce the dust content of the blast furnace gas and improve the service life of the heat exchanger, valve, flow meter and thermometer equipment in the system.

[0008] Optionally, the third gas pipeline is connected to the gas inlet of the heat exchanger, and a fourth gas pipeline is set at the gas outlet of the heat exchanger to merge into the first gas pipeline. The fourth gas pipeline is provided with a third gas flow regulating valve for flow regulation and heat exchanger maintenance. A third thermometer is also provided to measure the gas temperature after heating.

[0009] Optionally, a fourth thermometer is provided on the hot blast furnace flue gas duct to measure the high-temperature flue gas temperature of the hot blast furnace, and a third flue gas flow regulating valve is provided on the flue gas duct in front of the waste heat recovery area to control the flue gas flow of the pipeline.

[0010] Optionally, a pipe in front of the flue gas inlet of the heat exchanger is led out from the hot blast furnace flue gas pipe. The pipe is provided with a first flue gas flow regulating valve and a second flow meter for regulating the flue gas flow of the pipe and measuring the flue gas flow of the pipe. The pipe is connected to the flue gas inlet of the heat exchanger.

[0011] Optionally, a pipe behind the heat exchanger flue gas outlet is arranged at the heat exchanger flue gas outlet, merges into the hot blast furnace flue gas pipe and is discharged from the hot blast furnace chimney; a fifth thermometer is arranged on the pipe behind the heat exchanger flue gas outlet to measure the flue gas temperature after heat exchange, and a second flue gas flow regulating valve is also provided for flow regulation and heat exchanger maintenance.

[0012] The beneficial effects of the present utility model are as follows: The present utility model provides a blast furnace gas heating system that, when the blast furnace gas temperature is low, can heat the blast furnace gas, preventing gas condensation and dry bag compaction, maintaining the normal operation of the dry dust removal system, and ensuring stable blast furnace production. Furthermore, heating is performed by utilizing the waste heat from the hot blast furnace's high-temperature flue gas, eliminating energy waste. Furthermore, the need for heating can be determined based on the actual blast furnace gas temperature, and the amount of gas to be heated and the amount of hot blast furnace flue gas to be consumed can be automatically adjusted as needed, enabling fully automatic operation without the need for additional operators.

[0013] Other advantages, objectives, and features of the present invention will be described in detail in the following description and, to some extent, will be apparent to those skilled in the art upon examination and study of the following or may be learned from practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0015] Figure 1 This is the overall system diagram of the utility model.

[0016] Figure numerals: blast furnace 1, gravity dust collector 2, first gas pipeline 3, first thermometer 4, first gas flow regulating valve 5, second thermometer 6, dry dust collector 7, second gas pipeline 8, second gas flow regulating valve 9, first flowmeter 10, cyclone dust collector 11, third gas pipeline 12, heat exchanger 13, fourth gas pipeline 14, third thermometer 15, third gas flow regulating valve 16, hot blast stove 17, hot blast stove flue gas pipeline 18, fourth thermometer 19, heat exchanger flue gas inlet front pipe 20, first flue gas flow regulating valve 21, second flowmeter 22, heat exchanger flue gas outlet rear pipe 23, fifth thermometer 24, second flue gas flow regulating valve 25, third flue gas flow regulating valve 26, flue gas return chimney pipe 27, chimney 28, downcomer 29, waste heat recovery area 30. DETAILED DESCRIPTION

[0017] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0018] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0019] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0020] See also Figure 1 The dotted line in the figure illustrates the currently conventionally designed blast furnace gas and hot blast stove flue gas routes, i.e., the blast furnace gas generated by the blast furnace 1 passes through the downcomer 29 to the gravity dust collector 2, and then passes through the first gas pipeline 3 to the dry dust collector 7; the high-temperature flue gas generated by the hot blast stove 17 passes through the hot blast stove flue gas pipeline 18 to the waste heat recovery area 30 for utilization, and then passes through the flue gas return chimney pipeline 27 to the hot blast stove chimney 28 before being discharged.

[0021] The utility model discloses a blast furnace gas heating system, comprising a cyclone dust collector 11, a heat exchanger 13, a plurality of valves, two flow meters, a plurality of thermometers, and a heating gas source taken from the high-temperature flue gas of a hot blast furnace 17;

[0022] The system is set up between the blast furnace gravity dust collector 2 and the dry dust collector 7. A second gas pipe 8 is led out from the first gas pipe 3 and connected to the cyclone dust collector 11. A third gas pipe 12 after the outlet of the cyclone dust collector 11 is connected to the gas inlet of the heat exchanger 13. A fourth gas pipe 14 is set at the gas outlet of the heat exchanger 13 to merge into a section of the first gas pipe 3 near the inlet of the dry dust collector 7. A first thermometer 4 is set at the original first gas pipe 3 near the gravity dust collector outlet and the dry dust collector inlet. A first gas flow regulating valve 5 is installed on the first gas pipeline 3 to regulate the gas flow, and a second gas flow regulating valve 9 and a first flow meter 10 are installed on the newly added second gas pipeline 8. A third gas flow regulating valve 16 is installed on the fourth gas pipeline 14 after the outlet of the heat exchanger 13 to regulate the gas flow; a third thermometer 15 is installed on the fourth gas pipeline 14 after the outlet of the heat exchanger 13 to measure the temperature of the heated gas.

[0023] A heat exchanger flue gas inlet front pipe 20 is led out from the hot blast furnace flue gas pipe 18 and connected to the flue gas inlet of the heat exchanger 13. A heat exchanger flue gas outlet rear pipe 23 is set behind the flue gas outlet of the heat exchanger 13 to merge into the flue gas return chimney pipe 27 and then discharge the flue gas through the chimney 28; a fourth thermometer 19 is set on the original hot blast furnace flue gas pipe 18 to measure the high-temperature flue gas temperature, and a third flue gas flow regulating valve 26 is set to adjust the flue gas flow; a first flow regulating valve 21 and a second flowmeter 22 are set on the newly added heat exchanger flue gas inlet front pipe 20, a second flue gas flow regulating valve 25 is set on the heat exchanger flue gas outlet rear pipe 23 to adjust the flue gas flow, and a fifth thermometer 24 is set on the heat exchanger flue gas outlet rear pipe 23 to measure the flue gas temperature after heat exchange.

[0024] When the blast furnace gas temperature measured by the first thermometer 4 set on the first gas pipeline 3 is lower than the set temperature T (for example, 100°C, which can be adjusted), when it is lower than this temperature, the blast furnace gas reaching the dry dust removal bag is prone to condensation, causing the bag to become hardened. At this time, the system determines that the blast furnace gas needs to be heated. The system automatically calculates the blast furnace gas flow rate that needs to be heated and the hot blast furnace high-temperature flue gas flow rate that needs to be provided based on the blast furnace gas temperature measured by the first thermometer 4 on the first gas pipeline 3, the blast furnace gas flow rate, and the hot blast furnace high-temperature flue gas temperature measured by the fourth thermometer 19 on the hot blast furnace flue gas pipeline 18, and then opens the first flue gas flow regulating valve 21 on the heat exchanger flue gas inlet front pipe 20 and the second flue gas flow regulating valve 25 on the heat exchanger flue gas outlet rear pipe 23 to the appropriate opening, and at the same time appropriately closes the third flue gas flow regulating valve 26 on the flue gas return chimney pipe 27 to make the heat exchanger flue gas inlet front pipe The data measured by the second flowmeter 22 on the pipe 20 is consistent with the calculated hot blast furnace flue gas flow rate. The high-temperature hot blast furnace flue gas enters the flue gas inlet of the heat exchanger 13, heats the heat exchanger 13, and then passes through the pipe 23 after the heat exchanger flue gas outlet. It then merges into the flue gas return chimney pipe 27 and is discharged through the chimney 28. Then, the second gas regulating valve 9 on the second gas pipeline 8 and the third gas price regulating valve 16 on the fourth gas pipeline 14 are opened. At the same time, the first gas flow regulating valve 5 on the first gas pipeline 3 is adjusted to an appropriate opening so that the flow data measured by the first flowmeter 10 on the second gas pipeline 8 is consistent with the calculated heated gas flow rate. After passing through the cyclone dust collector 11, the blast furnace gas flows to the gas inlet of the heat exchanger 13, which is heated by the high-temperature hot blast furnace flue gas. It is then heated by the heat exchanger 13. The heated blast furnace gas is then merged into the first gas pipeline 3 through the fourth gas pipeline 14 and flows to the dry dust collector 7.

[0025] When the blast furnace gas temperature measured by the first thermometer 4 installed on the first gas pipeline 3 is higher than the set temperature T (for example, 100°C, which can be adjusted), the system determines that the blast furnace gas does not need to be heated. The system executes a procedure opposite to the gas heating operation, that is, closing the second gas flow regulating valve 9 on the second gas pipeline 8 and fully opening the first gas flow regulating valve 5 on the first gas pipeline 3, so that all the blast furnace gas flows from the first gas pipeline 3 to the dry dust collector 7; closing the first flue gas flow regulating valve 21 on the pipe 20 before the flue gas inlet of the heat exchanger, and fully opening the third flue gas flow regulating valve 26 on the flue gas return chimney pipe 27, so that all the hot blast furnace flue gas flows to the waste heat recovery area 30 and is then discharged through the chimney 28.

[0026] Providing a cyclone dust collector on the second gas pipeline 8 can reduce the dust content of the blast furnace gas, reduce the wear of the gas on the equipment, and increase the service life of the heat exchanger 13, the second gas flow regulating valve 9, the third gas flow regulating valve 16, the first flow meter 10, the third thermometer 15 and other equipment in the system.

[0027] A third gas flow regulating valve 16 is provided on the fourth gas pipeline 14, and a second flue gas flow regulating valve 25 is provided on the pipeline 23 after the flue gas outlet of the heat exchanger, so as to facilitate maintenance of the heat exchanger.

[0028] A third thermometer 15 is provided on the fourth gas pipe 14 to measure the temperature of the heated gas.

[0029] A fifth thermometer 24 is provided on the flue gas outlet pipe 23 of the heat exchanger to measure the flue gas temperature after heat exchange.

[0030] The set temperature T can be adjusted according to production needs to meet the requirements of the dry dust removal process; the opening of the flue gas flow control valve on the flue gas pipeline and the gas flow control valve on the gas pipeline can be automatically set by the computer program according to the needs of gas heating, or can be set manually based on production experience.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A blast furnace gas heating system, arranged between a blast furnace, a gravity dust collector, and a dry dust collector, wherein the blast furnace is connected to the gravity dust collector via a downcomer, and the gravity dust collector is connected to the dry dust collector via a first gas pipeline, characterized in that: It includes a second gas pipeline arranged in parallel with the first gas pipeline, a cyclone dust collector connected to the second gas pipeline, and a heat exchanger connected to the cyclone dust collector through a third gas pipeline, the outlet of the heat exchanger is connected to the dry dust collector through a fourth gas pipeline; The heating gas source is taken from the hot blast furnace flue gas, which is connected to the waste heat recovery area through the hot blast furnace flue gas pipeline, and the waste heat recovery area is connected to the chimney through the flue gas return chimney pipeline; The heat exchanger is connected to the hot blast furnace flue gas pipe through the heat exchanger flue gas inlet front pipe, and the hot blast furnace flue gas passes through the heat exchanger and is connected to the chimney through the heat exchanger flue gas outlet rear pipe.

2. A blast furnace gas heating system according to claim 1, characterized in that: A first gas flow regulating valve is provided on the first gas pipeline to control the gas flow of the first gas pipeline; a first thermometer and a second thermometer are respectively provided near the gravity dust collector outlet and the dry dust collector inlet to measure the blast furnace gas temperature at the gravity dust collector outlet and the blast furnace gas temperature at the dry dust collector inlet.

3. A blast furnace gas heating system according to claim 1, characterized in that: The second gas pipeline is a bypass pipeline of the first gas pipeline; the second gas pipeline is provided with a second gas flow regulating valve and a first flow meter for adjusting the gas flow of the second gas pipeline and measuring the gas flow of the second gas pipeline. The cyclone dust collector on the second gas pipeline is used to reduce the dust content of the blast furnace gas and improve the service life of the heat exchanger, valve, flow meter and thermometer equipment in the system.

4. A blast furnace gas heating system according to claim 1, characterized in that: The third gas pipeline is connected to the gas inlet of the heat exchanger. The fourth gas pipeline is set at the gas outlet of the heat exchanger to merge into the first gas pipeline. The fourth gas pipeline is provided with a third gas flow regulating valve for flow regulation and heat exchanger maintenance. A third thermometer is also provided to measure the gas temperature after heating.

5. A blast furnace gas heating system according to claim 1, characterized in that: A fourth thermometer is provided on the hot blast stove flue gas duct to measure the high-temperature flue gas temperature of the hot blast stove, and a third flue gas flow regulating valve is provided on the flue gas duct in front of the waste heat recovery area to control the flue gas flow in the flue gas duct in front of the waste heat recovery area.

6. A blast furnace gas heating system according to claim 1, characterized in that: A heat exchanger flue gas inlet front pipe is led out from the hot blast furnace flue gas pipe. The heat exchanger flue gas inlet front pipe is provided with a first flue gas flow regulating valve and a second flow meter for adjusting the flue gas flow of the heat exchanger flue gas inlet front pipe and measuring the flue gas flow of the heat exchanger flue gas inlet front pipe. The heat exchanger flue gas inlet front pipe is connected to the heat exchanger flue gas inlet.

7. A blast furnace gas heating system according to claim 1, characterized in that: The flue gas outlet pipe of the heat exchanger is set at the flue gas outlet of the heat exchanger, and is discharged from the hot blast furnace chimney after merging into the hot blast furnace flue gas pipe; A fifth thermometer is provided on the pipe behind the flue gas outlet of the heat exchanger to measure the flue gas temperature after heat exchange. A second flue gas flow regulating valve is also provided to regulate the flow and overhaul the heat exchanger.

Images