Flue gas waste heat utilization system of sintering circular cooler
By installing induced draft flues and heat exchangers in the third, fourth, and fifth sections of the annular cooler, and using heat pumps and sintering mixing water pumps for heat exchange, the problem of unutilized waste heat from the high-temperature flue gas of the annular cooler was solved, achieving waste heat recovery and improved production efficiency.
Patent Information
- Application Number
- CN202422900948.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-11-27
AI Technical Summary
The high-temperature flue gas in the third, fourth, and fifth stages of the annular cooler is not hot enough to be effectively utilized, resulting in a large amount of waste heat not being recovered and being directly emitted, affecting environmental quality.
Induced draft flues are installed at the exhaust ports of the third, fourth, and fifth sections of the annular cooler, connecting the flue gas heat exchanger and the wide-channel heat exchanger. Heat exchange is carried out using a heat pump and a sintering mixing water pump. The high-temperature flue gas is drawn to the flue gas heat exchanger through the induced draft flues to achieve heat recovery and utilization.
It realizes the recovery of waste heat from the high-temperature flue gas of the annular cooler, improves the production efficiency of hot water users, reduces the flue gas emission temperature, and improves the environmental quality.
Smart Images
Figure CN223512527U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of metallurgical ironmaking sintering technology, and in particular relates to a waste heat utilization system for flue gas from a sintering ring cooler. Background Technology
[0002] In the metallurgical industry, especially in the sintering process of ironmaking plants, a large amount of high-temperature flue gas (170-520℃) is generated during the cooling process of sintered ore in annular coolers. Currently, the high-temperature flue gas (380-520℃) generated in the first and second stages of the annular cooler is recovered and utilized for waste heat power generation. However, the high-temperature flue gas (170-220℃) generated in the third, fourth, and fifth stages of the annular cooler is not high enough to be effectively utilized and can only be emitted into the atmosphere. A large amount of latent heat is not collected and utilized, and a large amount of hot air is directly emitted into the atmosphere during this process, affecting environmental quality. Utility Model Content
[0003] The purpose of this invention is to provide a waste heat utilization system for sintering ring cooler flue gas, which solves the problem that the high-temperature flue gas in the third, fourth and fifth stages of the existing ring cooler is difficult to utilize effectively due to its low temperature and can only be discharged into the air.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A waste heat utilization system for sintering ring cooler flue gas includes an induced draft flue, a heat exchange unit, a heating unit, and a sintering mixing unit. The heat exchange unit includes a flue gas heat exchanger and a wide-flow-channel heat exchanger. Exhaust valves are installed at the exhaust ports of the third, fourth, and fifth sections of the sintering ring cooler. Induced draft flues are added to the exhaust ports of the third, fourth, and fifth sections of the sintering ring cooler. Induced draft electric valves are connected between the exhaust ports and the induced draft flues. The outlet of the induced draft flue is connected to the flue gas heat exchanger, drawing high-temperature flue gas to it. The outlet of the flue gas heat exchanger is connected to an induced draft fan, which is connected to a chimney. The heating unit includes a heat pump, with regulating valves connected to both its input and output ends. The output end of the heat pump is connected to a flue gas heat exchanger via a pipeline. The input end of the flue gas heat exchanger is connected to a ball valve. The output end of the flue gas heat exchanger is connected to a wide-channel heat exchanger. The input and output ends of the wide-channel heat exchanger are connected to butterfly valves. The output end of the wide-channel heat exchanger is connected to a hot water user. The sintering mixing unit includes a sintering mixing water pump. Both the input and output ends of the sintering mixing water pump are connected to regulating valves. The input end of the sintering mixing water pump is connected to water mist dust removal slurry water via a pipeline. The output end is connected to the wide-channel heat exchanger via a pipeline. The input end of the wide-channel heat exchanger is connected to a ball valve. The output end of the wide-channel heat exchanger is connected to the sintering mixing tank via a pipeline.
[0006] Preferably, valves are provided between the wide-channel heat exchanger and the hot water user, between the wide-channel heat exchanger and the input end of the heat pump, and between the hot water user and the heat pump.
[0007] Preferably, the heat pump is used with one pump in operation and one on standby, and the two pumps are connected in parallel.
[0008] Preferably, the sintering mixing water pump is used with one pump in operation and one on standby, and the two pumps are connected in parallel.
[0009] Working principle: The high-temperature flue gas from the third, fourth, and fifth stages of the annular cooler enters the flue gas heat exchanger through the induced draft duct. The heat exchanger uses the heat from the high-temperature flue gas in the third, fourth, and fifth stages of the annular cooler to heat the hot water used by users, thus raising the temperature of the hot water. Meanwhile, the temperature of the high-temperature flue gas from the third, fourth, and fifth stages of the annular cooler decreases, and it is discharged through the induced draft fan and chimney. The heated hot water then passes through a wide-channel heat exchanger, which uses part of the energy of the hot water to heat the water mist dust removal slurry. This raises the temperature of the water mist dust removal slurry without affecting the hot water supply to users. The high-temperature water mist dust removal slurry then enters the sintering mixing tank, accelerating the sintering and mixing condensation and improving production efficiency.
[0010] The beneficial effects achieved by this utility model are as follows:
[0011] (1) Install a discharge valve at the original exhaust port to ensure safe production and convenient maintenance, and avoid the sintering ring cooler system from failing to operate normally due to heat exchange system failure, so as to realize online maintenance of the heat exchange system without stopping the machine;
[0012] (2) High-temperature flue gas is drawn to the flue gas heat exchanger through the induced draft flue. The waste heat is utilized through the flue gas heat exchanger and the wide flow channel heat exchanger to realize the heat exchange between the flue gas and the hot water user's water and the sintering mixing water, so as to achieve the purpose of heat recovery and utilization. The cold water of the hot water user and the sintering mixing water supply are used as cooling media for heat exchange. The cold water and the sintering mixing water supply are used to exchange heat with the high-temperature flue gas in the third, fourth and fifth stages of the sintering ring cooler to reduce the flue gas temperature. The cold water temperature rises to complete the hot water supply. After the flue gas is cooled down, it is discharged at a low temperature to avoid affecting the environmental quality.
[0013] (3) The heating unit controls the hot water supply by switching valves, supplying hot water when needed and disconnecting it when not needed, making full and reasonable use of waste heat. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model.
[0015] Explanation of reference numerals in the attached drawings: 1. Exhaust fan flue; 2. Heat exchanger unit; 21. Flue gas heat exchanger; 22. Wide flow channel heat exchanger; 3. Heating unit; 31. Heat pump; 32. Regulating valve one; 33. Ball valve one; 34. Hot water user; 35. Valve; 4. Sintering mixing unit; 41. Sintering mixing water pump; 42. Regulating valve two; 43. Water mist dust removal slurry water; 44. Ball valve two; 45. Sintering mixing tank; 5. Discharge valve; 6. Exhaust fan electric valve; 7. Exhaust fan; 8. Chimney; 9. Butterfly valve. Detailed Implementation
[0016] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.
[0017] like Figure 1 As shown, a waste heat utilization system for sintering ring cooler flue gas includes an induced draft flue 1, a heat exchange unit 2, a heating unit 3, and a sintering mixing unit 4. The heat exchange unit 2 includes a flue gas heat exchanger 21 and a wide-channel heat exchanger 22. Exhaust valves 5 are installed at the exhaust ports of the third, fourth, and fifth sections of the sintering ring cooler. An induced draft flue 1 is installed at the exhaust ports of the third, fourth, and fifth sections of the sintering ring cooler. An induced draft electric valve 6 is connected between the exhaust port and the induced draft flue 1. The outlet of the induced draft flue 1 is connected to the flue gas heat exchanger 21, and the outlet of the flue gas heat exchanger 21 is connected to an induced draft fan 7. The induced draft fan 7 is connected to a chimney 8. The heating unit 3 includes a heat pump 31, with one operating and one standby pump connected in parallel. A regulating valve 32 is connected to both the input and output ends of the heat pump 31. The output end of heat pump 31 is connected to flue gas heat exchanger 21 via a pipeline. The input end of flue gas heat exchanger 21 is connected to ball valve 33. The output end of flue gas heat exchanger 21 is connected to wide-channel heat exchanger 22. The input and output ends of wide-channel heat exchanger 22 are connected to butterfly valve 9. The output end of wide-channel heat exchanger 22 is connected to hot water user 34. Valves 35 are installed between wide-channel heat exchanger 22 and hot water user 34, between wide-channel heat exchanger 22 and the input end of heat pump 31, and between hot water user 34 and heat pump 31. By utilizing the induced draft flue combined with the flue gas heat exchanger, the cold water of the hot water user exchanges heat with the high-temperature flue gas. The temperature of the cold water increases to achieve hot water supply, and the temperature of the high-temperature flue gas decreases to achieve low-temperature emission, avoiding the impact of hot flue gas on air quality.
[0018] The sintering mixing unit 4 includes a sintering mixing water pump 41, which is operated with one pump in operation and one on standby, connected in parallel. Both the input and output ends of the sintering mixing water pump 41 are connected to regulating valve 42. The input end is connected to water mist dust removal slurry 43 through a pipeline, and the output end is connected to a wide-channel heat exchanger 22 through a pipeline. The input end of the wide-channel heat exchanger 22 is connected to ball valve 44, and the output end of the wide-channel heat exchanger 22 is connected to the sintering mixing tank 45 through a pipeline. By utilizing the induced draft flue combined with the flue gas heat exchanger and the wide-channel heat exchanger, the high-temperature flue gas transfers heat with the cold water of the hot water user, raising the temperature of the cold water of the hot water user. The hot water then exchanges heat with the water mist dust removal slurry, raising the temperature of the water mist dust removal slurry, accelerating the rapid condensation of the sintering mixture, and improving production efficiency.
Claims
1. A waste heat recovery system for sintering ring cooler flue gas, characterized in that, The system includes an induced draft flue, a heat exchange unit, a heating unit, and a sintering mixing unit. The heat exchange unit includes a flue gas heat exchanger and a wide-channel heat exchanger. Exhaust valves are installed at the exhaust ports of the third, fourth, and fifth sections of the sintering annular cooler. Induced draft flues are added to the exhaust ports of the third, fourth, and fifth sections of the sintering annular cooler. Induced draft electric valves are connected between the exhaust ports and the induced draft flues. The outlet of the induced draft flue is connected to the flue gas heat exchanger, drawing high-temperature flue gas to it. The outlet of the flue gas heat exchanger is connected to an induced draft fan, which is connected to a chimney. The heating unit includes a heat pump. Regulating valves are connected to both the input and output ends of the heat pump. The output end of the heat pump is connected to… The sintering mixing unit is connected to a flue gas heat exchanger via a pipeline. The input end of the flue gas heat exchanger is connected to a ball valve, and the output end of the flue gas heat exchanger is connected to a wide-channel heat exchanger. The input and output ends of the wide-channel heat exchanger are connected to butterfly valves, and the output end of the wide-channel heat exchanger is connected to a hot water user. The sintering mixing unit includes a sintering mixing water pump. Both the input and output ends of the sintering mixing water pump are connected to regulating valves. The input end of the sintering mixing water pump is connected to water mist dust removal slurry water via a pipeline, and the output end is connected to the wide-channel heat exchanger via a pipeline. The input end of the wide-channel heat exchanger is connected to a ball valve, and the output end of the wide-channel heat exchanger is connected to the sintering mixing tank via a pipeline.
2. The sintering ring cooler flue gas waste heat utilization system according to claim 1, characterized in that, Valves are installed between the wide-channel heat exchanger and the hot water user, between the wide-channel heat exchanger and the input end of the heat pump, and between the hot water user and the heat pump.
3. The sintering ring cooler flue gas waste heat utilization system according to claim 2, characterized in that, The heat pump is configured with one pump in use and one on standby, and the two pumps are connected in parallel.
4. A sintering ring cooler flue gas waste heat utilization system according to claim 3, characterized in that, The sintering mixing water pump is configured with one pump in use and one on standby, and the two pumps are connected in parallel.