CN211976924U - System for utilize fused salt heat carrier to improve hot-blast temperature - Google Patents
System for utilize fused salt heat carrier to improve hot-blast temperature Download PDFInfo
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- CN211976924U CN211976924U CN202020162313.8U CN202020162313U CN211976924U CN 211976924 U CN211976924 U CN 211976924U CN 202020162313 U CN202020162313 U CN 202020162313U CN 211976924 U CN211976924 U CN 211976924U
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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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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The utility model discloses a system for improving hot air temperature by utilizing a fused salt heat carrier, which comprises a boiler, an SCR denitration device, an air preheater, a coal mill, a fused salt-flue gas heat exchanger, a fused salt tank and a fused salt-hot air heat exchanger; the boiler is communicated with a boiler tail vertical steering chamber, the boiler tail vertical steering chamber is respectively communicated with a fused salt-flue gas heat exchanger and an SCR (selective catalytic reduction) denitration device, the fused salt-flue gas heat exchanger is also communicated with the SCR denitration device, and the SCR denitration device is communicated with an air preheater; the fused salt-flue gas heat exchanger is also communicated with a fused salt-hot air heat exchanger, the fused salt-flue gas heat exchanger and the fused salt-hot air heat exchanger are also respectively communicated with a fused salt tank, meanwhile, the fused salt-hot air heat exchanger is communicated with a coal mill, and the coal mill is communicated with a boiler. The utility model discloses the effectual hot-blast temperature that has improved has solved the dry problem of exerting oneself inadequately of powder process system.
Description
Technical Field
The utility model relates to a system especially relates to a system for utilize fused salt heat carrier to improve hot-blast temperature.
Background
In a thermal power plant, the tail flue gas of a coal-fired boiler usually passes through an economizer, an SCR denitration device and an air preheater in sequence, then enters a dust removal and desulfurization device, and is finally discharged through a chimney. For the direct-blowing coal pulverizing system of the medium-speed coal mill, cold air is conveyed into an air preheater through a fan, exchanges heat with high-temperature flue gas, and hot air heated by the air preheater enters the medium-speed coal mill to finish drying, grinding and conveying of raw coal.
The high-moisture lignite has higher requirements on the drying capacity of a pulverizing system so as to evaporate external moisture falling into raw coal in front of a furnace. However, in the existing coal mill, the hot air volume at the inlet is limited by the maximum ventilation volume of the coal mill, so that the high hot air temperature is required for the high-moisture lignite, and the drying output requirement of a pulverizing system can be met. The denitration catalyst in the SCR denitration device can run for a long time at the temperature of over 400 ℃, and the phenomenon that local activity is reduced or the denitration is completely ineffective can appear, so, in order to ensure the safe operation of the catalyst, the flue gas temperature is required to be between 320-400 ℃, namely the flue gas temperature entering the air preheater can not be higher than 400 ℃. However, due to the limitation of heat exchange temperature difference, the air temperature at the outlet of the air preheater can only be heated to about 370 ℃, which is not enough to meet the requirement of drying output of the high-moisture lignite coal mill. The existing units for burning high-moisture lignite have the problem of insufficient drying output of a pulverizing system, but no effective solution exists at present.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model provides a system for improving the temperature of hot air by utilizing a fused salt heat carrier.
In order to solve the technical problem, the utility model discloses a technical scheme is: a system for improving the temperature of hot air by utilizing a molten salt heat carrier comprises a boiler, an SCR denitration device, an air preheater, a coal mill, a molten salt-flue gas heat exchanger, a molten salt tank and a molten salt-hot air heat exchanger;
the boiler is communicated with a vertical turning chamber at the tail part of the boiler, and a flue gas heat exchanger is arranged in the vertical turning chamber at the tail part of the boiler; the boiler tail vertical steering chamber is respectively communicated with a bypass flue and a first denitration flue, the bypass flue is communicated with the molten salt-flue gas heat exchanger, and the first denitration flue is communicated with the SCR denitration device;
the molten salt-flue gas heat exchanger is communicated with the SCR denitration device through a second denitration flue, and the second denitration flue is converged with the first denitration flue; the SCR denitration device is communicated with an air preheater, the air preheater is respectively communicated with a flue gas discharge pipe and a fan interface pipeline, the flue gas discharge pipe is externally connected with a dust removal device, and the fan interface pipeline is externally connected with a fan;
the fused salt-flue gas heat exchanger is communicated with the fused salt-hot air heat exchanger through a second fused salt pipeline, the fused salt-flue gas heat exchanger is also communicated with a first fused salt pipeline, the first fused salt pipeline is communicated with a fused salt tank, and a fused salt pump is arranged on the first fused salt pipeline; a molten salt heat carrier is contained in the molten salt tank and communicated with a third molten salt pipeline, and the third molten salt pipeline is communicated with the molten salt-hot air heat exchanger;
the molten salt-hot air heat exchanger is also respectively communicated with a first hot air pipeline and a second hot air pipeline; the second hot air pipeline is communicated with the air preheater, the first hot air pipeline is communicated with a coal mill, and the coal mill is communicated with a boiler through an air powder conveying pipeline.
Further, the fused salt-flue gas heat exchanger and the fused salt-hot air heat exchanger both adopt a fused salt heat carrier as a heat transfer medium.
Further, the molten salt heat carrier is one or more of nitrate, carbonate, fluorine salt, chlorine salt and binary mixed nitric acid molten salt.
The utility model discloses an utilize system of fused salt heat carrier improvement hot-blast temperature is on the original process systems basis of coal fired boiler of thermal power factory, through addding relevant fused salt systems such as bypass flue, fused salt-gas heater, fused salt-hot air heater, the effectual hot-blast temperature that has improved. Especially for burning high moisture brown coal unit, through this system, air heater export hot air temperature can promote more than 50 ℃, and the temperature that corresponds coal pulverizer export air-powder mixture also can further improve, fully reaches the design standard requirement of coal pulverizer export air-powder mixture temperature, has solved the not enough problem of powder process system drying output.
Drawings
Fig. 1 is a schematic diagram of the system of the present invention.
FIG. 2 is a schematic view of a conventional coal-fired boiler system.
In the figure: 1. a boiler; 2. a vertical turning chamber at the tail of the boiler; 3. a molten salt-flue gas heat exchanger; 4. a molten salt pump; 5. a molten salt tank; 6. an SCR denitration device; 7. an air preheater; 8. a molten salt-hot air heat exchanger; 9. A first hot air duct; 10. a coal mill; 11. a wind powder conveying pipeline; 12. a bypass flue; 13. a flue gas heat exchanger; 14. a first denitration flue; 15. a second denitration flue; 16. a second hot air pipeline; 17. a first molten salt pipeline; 18. a second molten salt pipeline; 19. a third molten salt pipeline; 20. a flue gas discharge pipe; 21. Fan interface pipeline.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
A system for improving the temperature of hot air by using a molten salt heat carrier is shown in figure 1 and comprises a boiler 1, an SCR denitration device 6, an air preheater 7, a coal mill 10, a molten salt-flue gas heat exchanger 3, a molten salt tank 5 and a molten salt-hot air heat exchanger 8;
wherein, boiler 1 intercommunication has the vertical room 2 that turns to of boiler afterbody, and the vertical room 2 that turns to of boiler afterbody installs gas heater 13 in, and gas heater 13 is used for carrying out the heat transfer to the high temperature flue gas that boiler 1 burning generated.
The boiler tail vertical steering chamber 2 is respectively communicated with a bypass flue 12 and a first denitration flue 14. The bypass flue 12 is additionally arranged on the basis of an original system of a thermal power plant and is communicated with the fused salt-flue gas heat exchanger 3, the fused salt-flue gas heat exchanger 3 is communicated with the SCR denitration device 6 through a second denitration flue 15, and a smoke taking port of the bypass flue 12 is arranged at a vertical turning chamber 2 at the tail part of the boiler, so that the bypass flue 12 directly extracts high-temperature flue gas at the tail part of the boiler, the high-temperature flue gas is sent into the fused salt-flue gas heat exchanger 3 for heat exchange, the temperature of the high-temperature flue gas is 680-720 ℃ and is usually about 700 ℃, after heat exchange of the fused salt-flue gas heat exchanger 3, the temperature of the flue gas is reduced to 380-400 ℃, and then the flue gas is returned into the SCR denitration device.
The first denitration flue 14 is directly communicated with the SCR denitration device 6, and therefore, the rest flue gas enters the SCR denitration device 6 from the first denitration flue 14 after being subjected to heat exchange through the flue gas heat exchanger 13 in the boiler tail vertical steering chamber 2. No. two denitration flues 15 and a denitration flue 14 meet mutually, can accelerate the speed that the flue gas got into SCR denitrification facility 6.
The SCR denitration device 6 is communicated with the air preheater 7, so that the flue gas treated by the SCR denitration treatment device 6 can enter the air preheater 7 for heat exchange.
The air preheater 7 is respectively communicated with a flue gas discharge pipe 20 and a fan interface pipeline 21. Wherein, the flue gas discharge pipe 20 is externally connected with a dust removal device, and the flue gas can be discharged through a chimney after being safely treated by a dust removal system; the fan interface pipeline 21 is externally connected with a fan, cold air is fed by the fan, and the cold air and the flue gas entering the air preheater 7 form hot air after heat exchange.
As shown in fig. 2, the system is an original system of a thermal power plant, at this time, hot air generated after heat exchange by the air preheater 7 directly enters the coal mill 10 through a hot air pipeline, and generally, the air temperature at the outlet of the air preheater 7 can only reach about 370 ℃, which is not enough to meet the requirement of high-moisture lignite mill on drying output. Therefore, the utility model discloses an utilize system of fused salt heat carrier to improve hot-blast temperature has add fused salt-hot air heat exchanger 8 on hot-blast main, and the concrete mode of setting is: as shown in fig. 1, the molten salt-hot air heat exchanger 8 is communicated with the molten salt-flue gas heat exchanger 3 through a second molten salt pipeline 18, and the molten salt-hot air heat exchanger 8 is also communicated with a first hot air pipeline 9 and a second hot air pipeline 16 respectively; the second hot air pipeline 16 is communicated with the air preheater 7, the first hot air pipeline 9 is communicated with a coal mill 10, and the coal mill 10 is communicated with the boiler 1 through an air powder conveying pipeline 11.
Therefore, the molten salt-flue gas heat exchanger 3 sends the heated molten salt heat carrier into the molten salt-hot air heat exchanger 8 through the second molten salt pipe 18, so that hot air entering the molten salt-hot air heat exchanger 8 can exchange heat with the heated molten salt heat carrier, the temperature of the heated molten salt heat carrier is 400-500 ℃ and does not undergo phase change, the hot air absorbs heat of the molten salt heat carrier, the air temperature is further increased to above 420 ℃ from about 370 ℃, usually at 420-450 ℃, the further heated hot air enters the coal pulverizer 10 through the first hot air pipeline 9 to dry coal powder entering the boiler 1, the temperature of an air-powder mixture at an outlet of the coal pulverizer 10 is also increased to above 60 ℃ from 55 ℃, and the problem of insufficient drying output of a coal pulverizing system is effectively solved.
And simultaneously, the utility model discloses an utilize system that fused salt heat carrier improved hot-blast temperature has still increased fused salt jar 5, and fused salt jar 5 is used for holding the fused salt heat carrier. The molten salt tank 5 is communicated with the molten salt-flue gas heat exchanger 3 through a first molten salt pipeline 17, and a molten salt pump 4 is arranged on the first molten salt pipeline 17 to pump a molten salt heat carrier into the molten salt-flue gas heat exchanger 3; the molten salt tank 5 is also communicated with the molten salt-hot air heat exchanger 8 through a third molten salt pipeline 19, and after the molten salt heat carrier in the molten salt-hot air heat exchanger 8 exchanges heat with hot air, the temperature is reduced and the molten salt heat carrier is recycled into the molten salt tank 5 through the third molten salt pipeline 19, so that the molten salt heat carrier is repeatedly used, and the production cost is saved.
The fused salt-flue gas heat exchanger 3 and the fused salt-hot air heat exchanger 8 both adopt a fused salt heat carrier as a heat transfer medium. Heat carriers are intermediate media for transferring and transporting heat, and are industrially classified into organic heat carriers and inorganic heat carriers. The inorganic heat carrier includes water, steam, air, fume, molten salt, etc. The molten salt is an inorganic salt in a molten state, has good heat transfer performance and high use temperature, can meet various use temperatures, and is low in price.
The molten salt heat carrier of the utility model can adopt one or more of nitrate, carbonate, villaumite, chlorine salt and binary mixed nitrate molten salt. Among them, nitrate, carbonate, villaumite, chlorine salt, etc. have good heat-transfer and heat-storage performance, higher working temperature, wider working temperature range, low vapor pressure and low viscosity. Binary mixed molten nitrate salt and the like have good heat resistance stability and incombustibility, when the use temperature is below 600 ℃, the heat transfer working medium has no phase change in the whole heat absorption and heat transfer circulation, and the heat capacity of the molten salt is large, so that the heat absorber can bear higher heat flow density, thereby enabling the heat absorber to be more compact, reducing the manufacturing cost and reducing the heat loss.
The utility model discloses an utilize fused salt heat carrier to improve hot-blast temperature system can improve hot-blast temperature, and concrete method is as follows:
firstly, a coal pulverizer 10 grinds coal briquettes into coal powder, meanwhile, a first hot air pipeline 9 sends hot air into the coal pulverizer 10, the hot air is used as a drying heat source and a conveying medium, the coal powder is dried by the hot air and then forms an air-powder mixture with the hot air, the air-powder mixture is conveyed into a boiler 1 by an air-powder conveying pipeline 11 to be combusted, and high-temperature flue gas is generated after the coal powder is combusted in the boiler 1;
then, high-temperature flue gas enters a shaft steering chamber 2 at the tail of the boiler, the temperature of the flue gas is 680-720 ℃, a part of the flue gas is extracted into a bypass flue 12 and enters a molten salt-flue gas heat exchanger 3 to exchange heat with a molten salt heat carrier, the temperature of the flue gas is reduced to 380-400 ℃, the molten salt heat carrier is heated to 400-500 ℃, the flue gas enters an SCR (selective catalytic reduction) denitration device 6 through a second denitration flue 15 to be subjected to denitration treatment, and meanwhile, the molten salt heat carrier is heated by the flue gas in the molten salt-flue gas heat exchanger 3 and then is sent into a molten salt-hot air heat exchanger 8 through a second; the rest flue gas enters the SCR denitration device 6 through a first denitration flue 14 for denitration treatment after heat exchange is carried out on the rest flue gas by a flue gas heat exchanger 13 in the vertical shaft steering chamber 2 at the tail part of the boiler;
after the denitration treatment is finished, the flue gas enters the air preheater 7 to exchange heat with cold air sent by the fan interface pipeline 21, the flue gas is discharged from the flue gas discharge pipe 20 after heat exchange, and the cold air absorbs heat and is changed into hot air; and hot air enters the molten salt-hot air heat exchanger 8 from the second hot air pipeline 16 to exchange heat with the heated molten salt heat carrier, the temperature of the hot air is raised to 420-450 ℃, and then the hot air enters the coal pulverizer 10 from the first hot air pipeline 9 to dry the coal powder and finish the transportation of the coal powder.
The utility model discloses an utilize system of fused salt heat carrier improvement hot-blast temperature, on the original process systems basis of coal fired boiler of thermal power factory, through addding relevant fused salt systems such as bypass flue, fused salt-gas heater, fused salt-hot air heater, the effectual hot-blast temperature that has improved. Especially for burning high moisture brown coal unit, through this system, air heater export hot air temperature can promote more than 50 ℃, and the temperature that corresponds coal pulverizer export air-powder mixture also can further improve, fully reaches the design standard requirement of coal pulverizer export air-powder mixture temperature, has solved the not enough problem of powder process system drying output.
The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples, and the technical personnel in the technical field are in the present invention, which can also belong to the protection scope of the present invention.
Claims (3)
1. The utility model provides an utilize system that fused salt heat carrier improved hot-blast temperature, includes boiler (1), SCR denitrification facility (6), air heater (7), coal pulverizer (10), its characterized in that: the system also comprises a molten salt-flue gas heat exchanger (3), a molten salt tank (5) and a molten salt-hot air heat exchanger (8);
the boiler (1) is communicated with a boiler tail vertical steering chamber (2), and a flue gas heat exchanger (13) is arranged in the boiler tail vertical steering chamber (2); the boiler tail vertical steering chamber (2) is respectively communicated with a bypass flue (12) and a first denitration flue (14), the bypass flue (12) is communicated with the molten salt-flue gas heat exchanger (3), and the first denitration flue (14) is communicated with the SCR denitration device (6);
the molten salt-flue gas heat exchanger (3) is communicated with the SCR denitration device (6) through a second denitration flue (15), and the second denitration flue (15) is converged with the first denitration flue (14); the SCR denitration device (6) is communicated with the air preheater (7), the air preheater (7) is respectively communicated with a flue gas discharge pipe (20) and a fan interface pipeline (21), the flue gas discharge pipe (20) is externally connected with a dust removal device, and the fan interface pipeline (21) is externally connected with a fan;
the molten salt-flue gas heat exchanger (3) is communicated with the molten salt-hot air heat exchanger (8) through a second molten salt pipeline (18), the molten salt-flue gas heat exchanger (3) is also communicated with a first molten salt pipeline (17), the first molten salt pipeline (17) is communicated with the molten salt tank (5), and the first molten salt pipeline (17) is provided with a molten salt pump (4); a molten salt heat carrier is contained in the molten salt tank (5) and communicated with a third molten salt pipeline (19), and the third molten salt pipeline (19) is communicated with the molten salt-hot air heat exchanger (8);
the molten salt-hot air heat exchanger (8) is also respectively communicated with a first hot air pipeline (9) and a second hot air pipeline (16); the second hot air pipeline (16) is communicated with the air preheater (7), the first hot air pipeline (9) is communicated with the coal mill (10), and the coal mill (10) is communicated with the boiler (1) through an air powder conveying pipeline (11).
2. The system for increasing the temperature of hot blast by using a molten salt heat carrier according to claim 1, characterized in that: the fused salt-flue gas heat exchanger (3) and the fused salt-hot air heat exchanger (8) both adopt a fused salt heat carrier as a heat transfer medium.
3. The system for increasing the temperature of hot blast by using a molten salt heat carrier according to claim 2, characterized in that: the molten salt heat carrier is one or more of nitrate, carbonate, villaumite, chlorine salt and binary mixed nitric acid molten salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020162313.8U CN211976924U (en) | 2020-02-12 | 2020-02-12 | System for utilize fused salt heat carrier to improve hot-blast temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020162313.8U CN211976924U (en) | 2020-02-12 | 2020-02-12 | System for utilize fused salt heat carrier to improve hot-blast temperature |
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| CN211976924U true CN211976924U (en) | 2020-11-20 |
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| CN202020162313.8U Expired - Fee Related CN211976924U (en) | 2020-02-12 | 2020-02-12 | System for utilize fused salt heat carrier to improve hot-blast temperature |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111336541A (en) * | 2020-02-12 | 2020-06-26 | 江苏慧峰仁和环保科技有限公司 | System and method for improving temperature of hot air by using molten salt heat carrier |
-
2020
- 2020-02-12 CN CN202020162313.8U patent/CN211976924U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111336541A (en) * | 2020-02-12 | 2020-06-26 | 江苏慧峰仁和环保科技有限公司 | System and method for improving temperature of hot air by using molten salt heat carrier |
| CN111336541B (en) * | 2020-02-12 | 2024-07-19 | 江苏慧峰仁和环保科技有限公司 | System and method for improving hot air temperature by using molten salt heat carrier |
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