CN209857666U - High-temperature reduction calcine cooling protection waste heat recovery system - Google Patents
High-temperature reduction calcine cooling protection waste heat recovery system Download PDFInfo
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- CN209857666U CN209857666U CN201920181522.4U CN201920181522U CN209857666U CN 209857666 U CN209857666 U CN 209857666U CN 201920181522 U CN201920181522 U CN 201920181522U CN 209857666 U CN209857666 U CN 209857666U
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Abstract
The utility model discloses a high temperature reduction calcine cooling protection waste heat recovery system, which comprises a first-stage fluidized bed heat exchanger and a second-stage fluidized bed heat exchanger which are communicated in sequence and communicated with a nitrogen pipe network through a nitrogen pressurizing fan, wherein the first-stage fluidized bed heat exchanger and the second-stage fluidized bed heat exchanger are communicated with a first-stage dust remover, a second-stage dust remover and a third-stage heat exchanger in sequence; the discharge port of the secondary fluidized bed heat exchanger is communicated with the feed port of the fluidized bed preheater through a material sealing valve, and the material sealing valve and the air inlet of the fluidized bed preheater are respectively communicated with the air outlet of the air pressurizing fan. The utility model provides a high temperature reduction calcine calcination concentrate quality poor, the high problem of calcination energy consumption, but wide application in high temperature powder iron ore, manganese ore etc. easily take place oxidation reaction's mineral resources after the reduction roasting.
Description
Technical Field
The utility model belongs to the technical field of the waste heat recovery of mine metallurgy trade, a high temperature reduction calcine cooling protection waste heat recovery system is related to.
Background
China has rich complex refractory iron oxide ore resources, the mineral composition is complex, the magnetism is weak, the disseminated granularity is fine, and ideal separation indexes are difficult to obtain by the conventional strong magnetic separation process. After the ore is subjected to reduction roasting pretreatment and then processes such as magnetic separation, reverse flotation and the like, better separation indexes can be obtained.
The reduction roasting of the ore refers to that the ore (hematite, limonite, siderite, ferro-manganese ore and the like) is heated to a certain temperature and then reacts with a reducing agent to reduce the hematite with weak magnetism into magnetite with strong magnetism. The reducing agent can be one or more of lignite, anthracite, coke, blast furnace gas, converter gas, producer gas, natural gas, heavy oil and the like. In recent years, with the development of the magnetizing roasting technology, iron ore is made into powder, and a fluidized roasting method is gradually applied. The fluidized magnetizing roasting technology has the characteristics of low energy consumption, large treatment capacity, small occupied area, high waste heat utilization rate, capability of treating powder ore and the like. However, the technology of the waste heat recovery system is immature, so that the reduction calcine is at high temperature (large) in industrial applicationWhen the hematite alpha-Fe is contacted with air at 400 ℃, the hematite alpha-Fe generates weak magnetic property through peroxidation reaction2O3) The quality of the roasted concentrate is seriously influenced. In order to avoid this, if the high-temperature reduction calcine is cooled by water to a low temperature, the ore waste heat is difficult to recover, the roasting energy consumption is greatly increased, and the overall benefit of the fluidized roasting process of the fine ore is affected. The existing high-temperature reduction calcine cooling device can not achieve the dual purposes of ensuring the quality of roasted concentrate, fully recovering the waste heat of ore and reducing the roasting cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high temperature reduction calcine cooling protection waste heat recovery system in order to solve the technical problem that the calcination concentrate quality that current high temperature reduction calcine cooling device exists is poor, calcination energy consumption is high.
The utility model aims at realizing through the following technical scheme: a high-temperature reduction calcine cooling protection waste heat recovery system comprises a first-stage fluidized bed heat exchanger, a discharge port of the first-stage fluidized bed heat exchanger is communicated with a feed port of a second-stage fluidized bed heat exchanger, a bottom air inlet of the first-stage fluidized bed heat exchanger and a bottom air inlet of the second-stage fluidized bed heat exchanger are communicated with a nitrogen pipe network through a nitrogen pressurizing fan, a top air outlet of the first-stage fluidized bed heat exchanger is respectively communicated with an air inlet of a first-stage dust remover, exhaust ports of the first-stage dust remover are respectively communicated with an air inlet of the second-stage dust remover, exhaust ports of the second-stage dust remover are communicated with an air inlet of the first-stage fluidized bed heat exchanger and the bottom air inlet of the second-stage fluidized bed heat, the inlet of a boiler tube of the tertiary heat exchanger is communicated with the demineralized water pump, an outlet tube is communicated with the boiler deaerator, the inlet of a boiler tube of the secondary fluidized bed heat exchanger is communicated with a water outlet tube of the boiler deaerator, the outlet of the boiler tube of the secondary fluidized bed heat exchanger is communicated with a water inlet of a boiler drum, a gas outlet of the boiler drum is communicated with a gas inlet of a boiler tube of the primary fluidized bed heat exchanger, and a gas outlet of the primary fluidized bed heat exchanger; the nitrogen pipe network is communicated with a nitrogen outlet of the nitrogen production equipment; the discharge port of the secondary fluidized bed heat exchanger is communicated with the feed port of the fluidized bed preheater through a material sealing valve, the material sealing valve and the air inlet at the bottom of the fluidized bed preheater are respectively communicated with the air outlet of the air pressurizing fan, and the discharge port of the fluidized bed preheater is communicated with the slurry making stirring tank.
As the improvement of the technical scheme of the utility model, be equipped with electronic to empty discharge valve on the pipeline between above-mentioned oxygen analysis appearance and the nitrogen gas forced draught fan, the oxygen analysis appearance is connected with electronic to empty discharge valve electricity. When the oxygen concentration exceeds the set index of the oxygen analyzer, the oxygen content of the gas in the system exceeds the standard, the air emptying valve can be emptied through electric operation, and new nitrogen is supplemented.
Compare with current high temperature reduction calcine cooling device, the beneficial effects of the utility model are that:
1. the utility model discloses with the high temperature reduction calcine cool off in anaerobic nitrogen gas protective atmosphere to oxidation temperature (200 ~ 400 ℃) after following with the air contact, make its mild oxidation become the maghemite (gamma-Fe) of strong magnetism2O3) And the heat released when the magnetite is oxidized into the maghemite is utilized, the heat consumption of roasting is reduced, and secondary energy is formed for recycling.
2. The high-temperature reduction calcine exchanges heat with the desalted water introduced into the fluidized bed heat exchanger in a fluidized state under the action of nitrogen, the flow rate is low, and the heat exchange is sufficient.
3. The nitrogen after waste heat recovery is recycled after cooling and purification, only the nitrogen lost in the system needs to be supplemented after the system is stable, and the total consumption of the nitrogen is low.
4. The low-temperature ore can preheat combustion-supporting air, and the temperature of the combustion-supporting air and the utilization value of the waste heat of the low-temperature ore are improved.
To sum up, the utility model has the characteristics of prevent that the high temperature calcine from peroxidating, waste heat recovery utilization rate is high, nitrogen gas cyclic utilization etc, mainly solved the peroxidation and the waste heat recovery difficulty of high temperature likepowder reduction calcine in cooling process to lead to the problem that calcination concentrate quality is poor, calcination energy consumption is high, but wide application in high temperature powder iron ore, manganese ore etc. easily take place oxidation reaction's mineral resources after the reduction roasting, improved the economic value of this type of resource development utilization.
Drawings
FIG. 1 is a schematic view showing the connection relationship of the system for cooling and protecting waste heat recovery of high temperature reduction calcine of the present invention;
reference numerals: 1. a primary dust remover; 2. a first-stage fluidized bed heat exchanger; 3. a nitrogen pressurizing fan; 4. a nitrogen pipe network; 5. a fluidized bed preheater; 6. an air pressurizing fan; 7. a material sealing valve; 8. a boiler deaerator; 9. a tertiary heat exchanger; 10. a secondary dust remover; 11. a secondary fluidized bed heat exchanger; 12. an oxygen analyzer; 13. an electric air exhaust valve; 14. a demineralized water pump; 15. nitrogen making equipment; 16. a slurry making and stirring tank; 17. a boiler drum.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1, a high-temperature reduction calcine cooling protection waste heat recovery system comprises a first-stage fluidized bed heat exchanger 2, a discharge port of the first-stage fluidized bed heat exchanger 2 is communicated with a feed inlet of a second-stage fluidized bed heat exchanger 11, a bottom air inlet of the first-stage fluidized bed heat exchanger 2 and the second-stage fluidized bed heat exchanger 11 is communicated with a nitrogen pipe network 4 through a nitrogen pressurizing fan 3, a top air outlet is respectively communicated with an air inlet of a first-stage dust remover 1, exhaust ports of the first-stage dust remover 1 are respectively communicated with an air inlet of a second-stage dust remover 10, an exhaust port of the second-stage dust remover 10 is communicated with an air inlet of a third-stage heat exchanger 9, an exhaust port of the third-stage heat exchanger 9 is respectively communicated with the bottom air inlets of, an electric air exhaust valve 13 is arranged on a pipeline between the oxygen analyzer 12 and the nitrogen pressurizing fan 3, and the oxygen analyzer 12 is electrically connected with the electric air exhaust valve 13. An inlet of a boiler pipe in the tertiary heat exchanger 9 is communicated with a demineralized water pump 14, an outlet pipe is communicated with a boiler deaerator 8, an inlet of a boiler pipe of the secondary fluidized bed heat exchanger 11 is communicated with a water outlet pipe of the boiler deaerator 8, an outlet of the boiler pipe is communicated with a water inlet pipe of a boiler drum 17, an air outlet of the boiler drum 17 is communicated with an air inlet of a boiler pipe of the primary fluidized bed heat exchanger 2, and an air outlet of the primary fluidized bed heat exchanger 2 is communicated with a steam turbine set; the nitrogen pipe network 4 is communicated with the air outlet of the nitrogen making equipment 15; the discharge port of the secondary fluidized bed heat exchanger 11 is communicated with the feed port of the fluidized bed preheater 5 through a material sealing valve 7, the material sealing valve 7 and the air inlet at the bottom of the fluidized bed preheater 5 are respectively communicated with the air outlet of the air pressurizing fan 6, and the discharge port of the fluidized bed preheater 5 is communicated with the slurry making stirring tank 16.
The operation of the system comprises the following process, wherein the cooling medium in the first-stage fluidized bed heat exchanger 2 and the second-stage fluidized bed heat exchanger 11 is desalted water discharged from the deaerator 8 of the boiler.
Step one, starting a nitrogen pressurization fan 3, respectively introducing nitrogen discharged from a nitrogen outlet of nitrogen making equipment 15 into a first-stage fluidized bed heat exchanger 2 and a second-stage fluidized bed heat exchanger 2 through a nitrogen pipe network 4, and flowing the nitrogen to the whole system to enter an oxygen analyzer 12, wherein when the oxygen concentration displayed by the oxygen analyzer 12 is lower than 2%, the nitrogen atmosphere in the system meets the feeding condition;
and step two, putting the high-temperature reduction calcine into the first-stage fluidized bed heat exchanger 2, wherein the high-temperature reduction calcine forms a low-flow-rate fluidized state under the action of nitrogen at the bottom of the first-stage fluidized bed heat exchanger 2, slowly moves towards a discharge port, and is finally discharged from the discharge port to enter the second-stage fluidized bed heat exchanger 11. In the process, the high-temperature reduction calcine mainly exchanges heat with desalted water in the boiler tube wall of the first-stage fluidized bed heat exchanger 2, and nitrogen only takes away a small amount of heat; the reduced calcine enters a secondary fluidized bed heat exchanger 11, and is cooled to 200-fold at the same state in a primary fluidized bed heat exchanger 2 to obtain low-temperature reduced calcine, the low-temperature reduced calcine is discharged from a discharge port and enters a material sealing valve 7 to form material sealing, gas cross-connection of different gas sources at the upper stage and the lower stage is prevented, and the purity of circulating nitrogen is reduced or nitrogen loss is caused;
step three, starting an air pressurizing fan 6, introducing compressed air into the bottom of a material sealing valve 7 and the bottom of a fluidized bed preheater 5, feeding the low-temperature reduced calcine into the fluidized bed preheater under the action of the compressed air, and performing heat exchange with the compressed air in a fluidized state to obtain preheated combustion-supporting air and the temperature of the preheated combustion-supporting air lower than 100 DEG CThe ultra-low temperature reduction calcine enters a pulping stirring tank 16 for pulping and then enters subsequent sorting operation, and the ultra-low temperature reduction calcine can be slightly oxidized into strong magnetic gamma-Fe when contacting with air2O3The heat released during the oxidation reaction can be utilized, the heat consumption during the roasting is reduced, and the recycling value of the rest heat is improved; combustion-supporting air enters the combustion chamber of the roasting furnace through the air outlet at the top of the fluidized bed preheater 5 for supporting combustion, so that the roasting heat consumption can be reduced;
step four, nitrogen discharged from air outlets at the tops of the first-stage fluidized bed heat exchanger 2 and the second-stage fluidized bed heat exchanger 11 respectively enters the first-stage dust remover 1 for dust removal and then enters the second-stage dust remover 10, the nitrogen is purified by the second-stage dust remover 10 and then enters the third-stage heat exchanger 9, the nitrogen exchanges heat with desalted water discharged from the waste heat boiler 8 and then enters the oxygen analyzer 12, when the oxygen analyzer 12 displays that the oxygen concentration is lower than 2%, the nitrogen enters the first-stage fluidized bed heat exchanger 2 and the second-stage fluidized bed heat exchanger 11 through the nitrogen pressurizing fan 3, the nitrogen is recycled, the total consumption of the nitrogen is reduced, and the nitrogen making equipment 15 only supplements the nitrogen lost; when the oxygen analyzer 12 shows that the oxygen concentration is equal to or higher than 2%, the electric air exhaust valve 13 is opened to exhaust, and new nitrogen is supplemented from the nitrogen making equipment 15 until the oxygen analyzer 12 shows that the oxygen concentration is lower than 2%, and then the next cooling cycle is continued; and cooling the high-temperature reduction calcine in a nitrogen protective atmosphere, exchanging most of waste heat into desalted water, heating the desalted water to form steam, forming superheated steam through the boiler deaerator 8, the secondary flow-exchange bed heat exchanger 11, the boiler steam drum 17 and the primary flow-exchange bed heat exchanger 2 in sequence, and then sending the superheated steam into the steam turbine unit for reuse.
It should be noted that, the utility model discloses well fluidized bed heat exchanger and dust remover also can be for other progression, can adjust according to actual need at the operation in-process, and this adjustment should also belong to the utility model discloses a protection scope.
Claims (2)
1. A high-temperature reduction calcine cooling protection waste heat recovery system is characterized by comprising a first-stage fluidized bed heat exchanger, wherein a discharge port of the first-stage fluidized bed heat exchanger is communicated with a feed port of a second-stage fluidized bed heat exchanger, bottom air inlets of the first-stage fluidized bed heat exchanger and the second-stage fluidized bed heat exchanger are communicated with a nitrogen pipe network through a nitrogen pressurizing fan, a top air outlet is respectively communicated with an air inlet of a first-stage dust remover, exhaust ports of the first-stage dust remover are communicated with an air inlet of the second-stage dust remover, exhaust ports of the second-stage dust remover are communicated with an air inlet of a third-stage heat exchanger, and exhaust ports; an oxygen analyzer is arranged on a pipeline between an exhaust port of the tertiary heat exchanger and the nitrogen pressurizing fan, boiler pipes are arranged in the primary fluidized bed heat exchanger, the secondary fluidized bed heat exchanger and the tertiary heat exchanger, an inlet of the boiler pipe of the tertiary heat exchanger is communicated with the demineralized water pump, an outlet pipe of the boiler pipe of the tertiary heat exchanger is connected with the boiler deaerator, an inlet of the boiler pipe of the secondary fluidized bed heat exchanger is communicated with a water outlet pipe of the boiler deaerator, an outlet of the boiler pipe of the secondary fluidized bed heat exchanger is communicated with a water inlet of a boiler drum, an air outlet of the boiler drum is communicated with; the nitrogen pipe network is communicated with a nitrogen outlet of the nitrogen production equipment; the discharge port of the secondary fluidized bed heat exchanger is communicated with the feed port of the fluidized bed preheater through a material sealing valve, the material sealing valve and the air inlet at the bottom of the fluidized bed preheater are respectively communicated with the air outlet of the air pressurizing fan, and the discharge port of the fluidized bed preheater is communicated with the slurry making stirring tank.
2. The system for cooling and protecting waste heat recovery of high temperature reduction calcine according to claim 1, wherein an electric air exhaust valve is arranged on a pipeline between the oxygen analyzer and the nitrogen pressurizing fan, and the oxygen analyzer is electrically connected with the electric air exhaust valve.
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| CN201920181522.4U CN209857666U (en) | 2019-02-01 | 2019-02-01 | High-temperature reduction calcine cooling protection waste heat recovery system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813124A (en) * | 2019-02-01 | 2019-05-28 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of high temperature reduction calcining cooling protection residual neat recovering system and method |
| CN111961845A (en) * | 2020-07-01 | 2020-11-20 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Sectional cooling method for high-temperature powdery iron ore reduction calcine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813124A (en) * | 2019-02-01 | 2019-05-28 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of high temperature reduction calcining cooling protection residual neat recovering system and method |
| CN111961845A (en) * | 2020-07-01 | 2020-11-20 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Sectional cooling method for high-temperature powdery iron ore reduction calcine |
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