Flue gas dust removal and waste heat recovery system

Abstract

The invention provides a flue gas dust removal and waste heat recovery system. The flue gas dust removal and waste heat recovery system comprises a combustion settling chamber, a Carnot cell device and a dust remover which are sequentially arranged in the flue gas flowing direction; the Carnot battery device comprises a heat exchanger, a charging unit, an energy storage unit and a discharging unit; the heat exchanger is arranged on a pipeline between the combustion settling chamber and the dust remover; the charging unit is connected with the heat exchanger; the energy storage unit is connected with the charging unit and comprises a high-temperature energy storage module and a low-temperature energy storage module; the discharging unit is connected with the energy storage unit. The charging unit and the discharging unit are connected with a power grid. Wherein when the power grid is in a low load state, the charging unit can store heat transferred to the charging unit by the heat exchanger into the high-temperature energy storage module by utilizing redundant power; when the power grid is in a high load state, the discharge unit can use heat stored in the high-temperature energy storage module for power generation and supply to the power grid. The problem that an existing electric furnace dust removal flue gas cooling system does not recover flue gas waste heat or recovery is incomplete can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas waste heat recovery, and in particular to a flue gas dust removal waste heat recovery system for recovering and purifying electric furnace flue gas waste heat. Background Art

[0002] At present, the energy structure is gradually shifting to a new pattern dominated by renewable energy. However, due to the intermittent and volatile nature of renewable energy generation, the flexible regulation capacity of the power system faces huge challenges. Power storage is a key technology to achieve flexible regulation and precise control of electric energy, and plays a vital role in promoting energy transformation. Existing large-scale power storage systems can be divided into physical energy storage, chemical energy storage, and electromagnetic energy storage according to the form of energy conversion. Chemical energy storage and electromagnetic energy storage have considerable energy storage density and response speed, and are often used for backup power supply, smoothing power generation peaks and reciprocating power fluctuations, but they are expensive, short-lived, and have poor safety. Considering the scale, service life, and safety of energy storage, physical energy storage is currently the most suitable large-scale power storage method for peak regulation, frequency regulation, valley filling, and emergency backup of renewable energy power grids.

[0003] There are abundant types and quantities of industrial waste heat in industrial production. Fully recycling and utilizing this heat energy has great potential to improve energy utilization efficiency, especially the recovery of flue gas waste heat generated in electric furnace steelmaking. At present, the high-temperature flue gas containing dust and carbon monoxide generated during the smelting of the electric furnace enters the combustion and settling chamber through the flue gas exhaust elbow on the top of the furnace cover or the scrap steel preheating system. The high-temperature flue gas containing carbon monoxide is burned in the combustion and settling chamber and the electric furnace flue gas is roughly dusted to reduce the amount of dust in the dust removal system. Then, it enters the water-cooled or insulated pipeline (the flue gas temperature is about 800℃) to send the flue gas to the cooling system to cool it down to about 220℃, and enter the high-temperature resistant bag dust collector, or after mixing with the roof cover and closed cover dust removal flue gas, the flue gas temperature is reduced to about 120℃ and enters the ordinary pulse cleaning bag dust collector. The purified gas is discharged into the atmosphere by the fan through the exhaust pipe.

[0004] As mentioned above, existing electric furnaces are usually equipped with a separate dust removal system to control the system air volume and save system energy consumption while ensuring the dust removal effect. However, the current dust removal system does not recover the waste heat of the flue gas or has the problem of incomplete recovery, and does not effectively utilize the flue gas. The traditional flue gas cooling equipment has large resistance and consumes additional electricity, and does not utilize green electricity such as photovoltaic power generation. Summary of the invention

[0005] The purpose of the present invention is to provide a flue gas dust removal waste heat recovery system, which solves the problem that the existing electric furnace dust removal flue gas cooling system does not recover the flue gas waste heat or the recovery is incomplete. The flue gas waste heat is recovered by using a Carnot battery device with high recovery efficiency, and the flue gas waste heat can be converted into electrical energy.

[0006] The above technical objectives of the present invention are mainly achieved through the following technical solutions:

[0007] The present invention provides a flue gas dust removal waste heat recovery system, which comprises a combustion settling chamber, a Carnot battery device and a dust collector which are sequentially arranged along the flue gas flow direction;

[0008] The Carnot battery device comprises:

[0009] A heat exchanger is provided on the pipeline between the combustion settling chamber and the dust collector;

[0010] a charging unit connected to the heat exchanger;

[0011] An energy storage unit connected to the charging unit, the energy storage unit comprising a high-temperature energy storage module and a low-temperature energy storage module, the high-temperature energy storage module and the low-temperature energy storage module storing heat storage media at different temperatures, the high-temperature energy storage module and the low-temperature energy storage module being in communication;

[0012] A discharge unit connected to the energy storage unit, wherein both the charging unit and the discharge unit are connected to a power grid;

[0013] Among them, when the power grid is under low load, the charging unit can use excess power to store the heat transferred to the charging unit by the heat exchanger in the high-temperature energy storage module; when the power grid is under high load, the discharging unit can use the heat stored in the high-temperature energy storage module to generate electricity and supply it to the power grid.

[0014] In a preferred embodiment of the present invention, the Carnot battery device further comprises:

[0015] A solar power generation unit is connected to the charging unit, and the charging unit can use the electricity provided by the solar power generation unit to store the heat transferred to the charging unit by the heat exchanger into the high-temperature energy storage module.

[0016] In a preferred embodiment of the present invention, the solar power generation unit is also connected to the power grid.

[0017] In a preferred embodiment of the present invention, the heat exchanger is connected to a heat exchange circulation pipe, and the heat exchange circulation pipe is connected to the charging unit through the first evaporator.

[0018] In a preferred embodiment of the present invention, the charging unit has a charging circulation pipe, the first evaporator is connected between the heat exchange circulation pipe and the charging circulation pipe; a compressor is provided on the charging circulation pipe, and the power grid is connected to the compressor; the charging circulation pipe is connected to the energy storage unit through a first condenser.

[0019] In a preferred embodiment of the present invention, the energy storage unit has an energy storage circulation tube, and the first condenser is connected between the charging circulation tube and the energy storage circulation tube; the high-temperature energy storage module and the low-temperature energy storage module are respectively arranged on the energy storage circulation tube on both sides of the first condenser, and the energy storage circulation tube is connected to the discharge unit through a second evaporator.

[0020] In a preferred embodiment of the present invention, the discharge unit has a discharge circulation pipe, and the second evaporator is connected between the energy storage circulation pipe and the discharge circulation pipe; an expander is provided on the discharge circulation pipe, and the expander is connected to the power grid; the discharge circulation pipe is connected to a cooling water pipe through a second condenser.

[0021] In a preferred embodiment of the present invention, the solar power generation unit comprises:

[0022] Solar panels;

[0023] A storage battery connected to the solar panel;

[0024] An inverter is connected to the solar panel and the battery, and the inverter is also connected to the power grid and / or the charging unit.

[0025] In a preferred embodiment of the present invention, a scrap steel preheating device is provided between the combustion settling chamber and the smoke outlet of the electric furnace.

[0026] In a preferred embodiment of the present invention, an activated carbon injection device and a spark arrester are provided on the pipeline between the Carnot battery device and the dust collector.

[0027] In a preferred embodiment of the present invention, a muffler and an exhaust pipe are provided on the pipe connected to the outlet end of the dust collector.

[0028] Compared with the prior art, the technical solution of the present invention has the following characteristics and advantages:

[0029] 1. Economical: The system can recover low-temperature waste heat and reduce the flue gas temperature to the allowable temperature range of the normal temperature dust removal bags. Normal temperature dust removal bags are used instead of high temperature bags, which greatly reduces the investment in the primary dust removal system of the electric furnace.

[0030] 2. Multi-energy supply capability: Carnot batteries can not only store and release electrical energy, but also provide heat and cold energy to achieve multi-energy supply.

[0031] 3. Energy conversion efficiency: Carnot battery realizes electric-heat conversion through high-temperature heat pump, has high energy conversion efficiency, and the energy storage efficiency can reach more than 70%.

[0032] 4. Environmental adaptability: The installation of the Carnot battery device is not restricted by geographical conditions and can be flexibly deployed where needed.

[0033] 5. Adjustment flexibility: Carnot batteries can quickly respond to grid demand, store and release electrical energy, and have good adjustment flexibility.

[0034] 6. Reduce carbon emissions: Carnot batteries can achieve low-carbon or zero-carbon emissions during energy storage and release, helping to reduce greenhouse gas emissions; the system can also use renewable energy solar energy to power Carnot batteries or the power grid to achieve low-carbon or zero-carbon emission power generation.

[0035] 7. Improve the utilization rate of waste heat: Carnot batteries can utilize low-grade waste heat, improve the utilization rate of industrial waste heat, and reduce energy waste.

[0036] 8. Long life and stability: The Carnot battery system is designed to have a long life of up to 30 years and has high cycle stability, making it suitable for long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0038] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0039] Figure 1 It is a structural schematic diagram of the flue gas dust removal waste heat recovery system of the present invention;

[0040] Figure 2 It is a schematic diagram of the structure of the Carnot battery device of the present invention.

[0041] Description of reference numerals:

[0042] 10. Electric furnace; 11. Scrap preheating device; 12. Combustion settling chamber; 13. Carnot battery device; 14. Activated carbon injection device; 15. Spark arrester; 16. Dust collector; 17. Fan; 18. Muffler; 19. Exhaust pipe;

[0043] 20. heat exchanger; 21. heat exchange circulation pipe; 22. hot water storage tank; 23. first water pump;

[0044] 30. Charging unit; 31. Charging circulation pipe; 32. First evaporator; 33. Compressor; 34. First condenser; 35. Throttle valve;

[0045] 40. Energy storage unit; 41. Energy storage circulation pipe; 42. Cold storage tank; 43. Heat storage tank;

[0046] 50. discharge unit; 51. discharge circulation pipe; 52. second evaporator; 53. expander; 54. second condenser; 55. second water pump; 56. cooling water pipe;

[0047] 60. Solar power generation unit; 61. Solar panel; 62. Battery; 63. Inverter;

[0048] 70. Power grid. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0050] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0052] like Figure 1 and Figure 2As shown, the present invention provides a flue gas dust removal waste heat recovery system, which includes a combustion settling chamber 12, a Carnot battery device 13 and a dust collector 16 arranged in sequence along the flue gas flow direction; the Carnot battery device 13 includes a heat exchanger 20, a charging unit 30, an energy storage unit 40 and a discharge unit 50: the heat exchanger 20 is arranged on a pipeline between the combustion settling chamber 12 and the dust collector 16; the charging unit 30 is connected to the heat exchanger 20; the energy storage unit 40 is connected to the charging unit 30, and the energy storage unit 40 includes a high-temperature energy storage module and a low-temperature energy storage module The high-temperature energy storage module and the low-temperature energy storage module store heat storage media of different temperatures, and the high-temperature energy storage module and the low-temperature energy storage module are connected; the discharge unit 50 is connected to the energy storage unit 40, and the charging unit 30 and the discharge unit 50 are both connected to the power grid 70; wherein, when the power grid 70 is underloaded, the charging unit 30 can use excess power to store the heat transferred from the heat exchanger 20 to the charging unit 30 in the high-temperature energy storage module; when the power grid 70 is underloaded, the discharge unit 50 can use the heat stored in the high-temperature energy storage module to generate electricity and supply it to the power grid 70.

[0053] The flue gas dust removal waste heat recovery system described in the present invention is mainly used for the treatment of primary flue gas from an electric furnace 10. The waste heat of the flue gas from the electric furnace 10 is recovered by using a Carnot battery device 13. The Carnot battery can not only quickly store and release electrical energy to respond to the needs of the power grid 70, but also provide heat and cold energy to achieve multi-energy continuous supply. The Carnot battery can achieve low-carbon or zero-carbon emissions during the energy storage and release process, which helps to reduce greenhouse gas emissions. At the same time, the Carnot battery has a high energy conversion efficiency and can reduce waste during the energy conversion process.

[0054] The specific structure of each part of the flue gas dust removal waste heat recovery system of the present invention, as well as the position and connection relationship between the parts will be described in detail below.

[0055] The flue gas dust removal waste heat recovery system has a combustion settling chamber 12, such as Figure 1 As shown, the flue gas outlet of the electric furnace 10 is connected to the combustion settling chamber 12 through a pipeline, and the primary flue gas generated in the electric furnace 10 enters the combustion settling chamber 12 through the pipeline for combustion, and part of the combustible gas in the flue gas is fully burned and converted into heat energy in the combustion settling chamber 12, which is reused through the subsequent waste heat recovery process to avoid the waste of part of the chemical energy in the flue gas. At the same time, the flue gas entering the combustion settling chamber 12 can also be initially settled to achieve rough dust removal, thereby reducing the amount of smoke in the subsequent processing process of the system.

[0056] The flue gas dust removal waste heat recovery system has a Carnot battery device 13, such as Figure 1 and Figure 2As shown, the outlet of the combustion settling chamber 12 is connected to the Carnot battery device 13 through a pipeline, and the Carnot battery device 13 is used to recover the waste heat of the flue gas; the pipeline between the combustion settling chamber 12 and the Carnot battery device 13 is a heat-insulating pipe to reduce the heat loss of the flue gas. Among them, the temperature of the flue gas flowing out of the combustion settling chamber 12 is about 800°C, and the flue gas is cooled to about 120°C after the waste heat is recovered by the Carnot battery device 13.

[0057] like Figure 2 As shown, the Carnot battery device 13 has a heat exchanger 20, which is arranged at the end of the thermal insulation pipe. The heat exchanger 20 is connected to a heat exchange circulation pipe 21, and a heat exchange medium (usually water) circulates in the heat exchange circulation pipe 21; in the heat exchanger 20, the flue gas in the thermal insulation pipe can exchange heat with the flue gas in the heat exchange circulation pipe 21, and the cooled flue gas is continuously transported forward through the flue gas pipeline, and the heat exchange medium in the heat exchange circulation pipe 21 is heated and flows toward the charging unit 30 in the Carnot battery device 13.

[0058] Better, such as Figure 2 As shown, a heat storage tank 22 and a first water pump 23 are provided on the heat exchange circulation pipe 21. The heat exchange medium after being heated in the heat exchange circulation pipe 21 can first enter the heat storage tank 22 for storage, and the first water pump 23 provides power for the circulation flow of the heat exchange medium in the heat exchange circulation pipe 21.

[0059] like Figure 2 As shown, the Carnot battery device 13 also has a charging unit 30, which includes a charging circulation pipe 31. A heat exchange medium (usually water) also circulates in the charging circulation pipe 31. A first evaporator 32 is connected between the heat exchange circulation pipe 21 and the charging circulation pipe 31. In the first evaporator 32, the high-temperature heat exchange medium in the heat exchange circulation pipe 21 exchanges heat with the low-temperature heat exchange medium (cold water) in the charging circulation pipe 31. After cooling, the heat exchange medium in the heat exchange circulation pipe 21 flows back into the heat exchanger 20 to continue to exchange heat with the flue gas. The cold water in the charging circulation pipe 31 generates steam after heat exchange and continues to be transported forward. Downstream of the first evaporator 32, a compressor 33 is provided on the charging circulation pipe 31. The steam enters the compressor 33 and is compressed to further increase the temperature. The compressor 33 is connected to the power grid 70, and the power grid 70 supplies power to the compressor 33. Downstream of the compressor 33, a first condenser 34 is further provided on the charging circulation pipe 31, and the charging circulation pipe 31 is connected to the energy storage unit 40 in the Carnot battery device 13 through the first condenser 34; in the first condenser 34, the steam in the charging circulation pipe 31 that has been pressurized and heated exchanges heat with the energy storage unit 40, and the steam in the charging circulation pipe 31 is cooled and liquefied into water and flows back into the first evaporator 32, and continues to exchange heat with the heat exchange working medium in the heat exchange circulation pipe 21.

[0060] Better, such as Figure 2As shown, a throttle valve 35 is provided on the charging circulation pipe 31 , and the throttle valve 35 can control the reflux speed of the condensed water in the charging circulation pipe 31 , thereby controlling the heat exchange time of the steam in the first condenser 34 .

[0061] like Figure 2 As shown, the Carnot battery device 13 also has an energy storage unit 40, which includes an energy storage circulation pipe 41, in which a heat storage medium (molten salt, etc.) circulates, and the first condenser 34 is connected between the charging circulation pipe 31 and the energy storage circulation pipe 41. A low-temperature energy storage module (cold storage tank 42) is provided on the energy storage circulation pipe 41 upstream of the first condenser 34, and a high-temperature energy storage module (heat storage tank 43) is provided on the energy storage circulation pipe 41 downstream of the first condenser 34, that is, the first condenser 34 is connected between the outlet of the cold storage tank 42 and the inlet of the heat storage tank 43, and the heat storage medium in the cold storage tank 42 can flow toward the heat storage tank 43 through the first condenser 34. In the first condenser 34, the steam in the charging circulation pipe 31 exchanges heat with the low-temperature molten salt in the energy storage circulation pipe 41, and the high-temperature molten salt generated after the low-temperature molten salt is heated flows to the heat storage tank 43 and is stored in the heat storage tank 43. Downstream of the heat storage tank 43, a second evaporator 52 is further provided on the energy storage circulation pipe 41, that is, the second evaporator 52 is provided between the outlet of the heat storage tank 43 and the inlet of the cold storage tank 42, and the high-temperature heat storage medium in the heat storage tank 43 can flow toward the cold storage tank 42 through the second evaporator 52. The energy storage circulation pipe 41 is connected to the discharge unit 50 in the Carnot battery device 13 through the second evaporator 52. In the second evaporator 52, the high-temperature molten salt in the energy storage circulation pipe 41 exchanges heat with the discharge unit 50, and the low-temperature molten salt generated after the high-temperature molten salt is cooled flows to the cold storage tank 42 and is stored in the cold storage tank 42.

[0062] like Figure 2As shown, the Carnot battery device 13 also has a discharge unit 50, which includes a discharge circulation pipe 51, in which a heat exchange medium (usually water) circulates, and a second evaporator 52 is connected between the energy storage circulation pipe 41 and the discharge circulation pipe 51; in the second evaporator 52, the high-temperature molten salt in the energy storage circulation pipe 41 exchanges heat with the cold water in the discharge circulation pipe 51, and the cold water in the discharge circulation pipe 51 generates steam after heating and continues to be transported forward. Downstream of the second evaporator 52, an expander 53 is provided on the discharge circulation pipe 51, and the steam in the discharge circulation pipe 51 enters the expander 53 to generate electricity, and the expander 53 is connected to the power grid 70, and the expander 53 generates electricity to supply the power grid 70. Downstream of the expander 53, a second condenser 54 is provided on the discharge circulation pipe 51, and the discharge circulation pipe 51 is connected to a cooling water pipe 56 through the second condenser 54, and cooling water flows in the cooling water pipe 56; in the second condenser 54, the steam in the discharge circulation pipe 51 that has been cooled by the expander 53 exchanges heat with the cooling water in the cooling water pipe 56, and the steam in the discharge circulation pipe 51 is cooled and liquefied into water and flows back into the second evaporator 52 to continue to exchange heat with the high-temperature molten salt in the energy storage circulation pipe 41.

[0063] Better, such as Figure 2 As shown, a second water pump 55 is provided on the discharge circulation pipe 51 , and the second water pump 55 provides power for the circulation of the heat exchange medium in the discharge circulation pipe 51 .

[0064] The flue gas dust removal and waste heat recovery system has a dust collector 16, such as Figure 1 As shown, the dust collector 16 is a bag dust collector, and the flue gas outlet of the Carnot battery device 13 is connected to the inlet of the bag dust collector through the flue gas duct, that is, the bag dust collector is connected to the flue gas outlet of the heat exchanger 20 through the flue gas duct; the flue gas is finely dusted by the bag dust collector to ensure that the flue gas meets the emission requirements. A Carnot battery device 13 for flue gas waste heat recovery is provided upstream of the bag dust collector. The flue gas temperature flowing into the bag dust collector is relatively low, so a normal temperature dust removal bag is used instead of a high temperature bag, which greatly reduces the investment in the primary dust removal system of the electric furnace 10.

[0065] The specific working process of the flue gas dust removal waste heat recovery system of the present invention is as follows:

[0066] When the grid is under low load, that is, during the off-peak period of electricity consumption, the heat exchanger 20, charging unit 30 and energy storage unit 40 in the Carnot battery device 13 work, and the compressor 33 uses the excess electricity in the grid to store the waste heat in the flue gas in the high-temperature molten salt in the heat storage tank 43 in the energy storage unit 40 through the heat pump principle.

[0067] When the grid is under high load, that is, during peak hours of electricity consumption, the energy storage unit 40 and the discharge unit 50 in the Carnot battery device 13 operate, and the expander 53 generates electricity using the generated steam to supply the electricity to the grid.

[0068] The structure and technical effects of the preferred implementation of the flue gas dust removal waste heat recovery system of the present invention will be further described below.

[0069] According to one embodiment of the present invention, Figure 2 As shown, the Carnot battery device 13 also includes a solar power generation unit 60, which is connected to the charging unit 30. The charging unit 30 can use the power provided by the solar power generation unit 60 to store the heat transferred from the heat exchanger 20 to the charging unit 30 in the high-temperature energy storage module. The flue gas dust removal waste heat recovery system can also use renewable energy solar energy to power the Carnot battery device 13 and the power grid 70, achieving low-carbon or zero-carbon emission power generation.

[0070] Specifically, Figure 2 As shown, the solar power generation unit 60 includes a solar panel 61, a battery 62 and an inverter 63; the battery 62 is connected to the solar panel 61; the inverter 63 is connected to the solar panel 61 and the battery 62, and the inverter 63 is also connected to the power grid 70 and / or the charging unit 30. The electric energy obtained by the solar panel 61 is converted into AC power by the inverter 63, and is used by the Carnot battery device 13. When more power is generated, the electric energy can be stored in the battery 62 for backup, or it can be incorporated into the public power grid 70. When the power generation is insufficient, the battery 62 can supply power, and when the power of the battery 62 is also insufficient, the public power grid 70 can directly supply power to the Carnot battery device 13, thereby improving the reliability of the system.

[0071] According to one embodiment of the present invention, Figure 1 As shown, a scrap steel preheating device 11 is provided between the combustion settling chamber 12 and the flue gas outlet of the electric furnace 10. The flue gas generated by the electric furnace 10 is first introduced into the chamber of the scrap steel preheating device 11 to preheat the scrap steel, realizing the primary utilization of the flue gas waste heat, and then introduced into the combustion settling chamber 12 through the flue gas pipeline for combustion and settling.

[0072] According to one embodiment of the present invention, Figure 1 As shown, an activated carbon spraying device 14 and a spark arrester 15 are provided on the pipeline between the Carnot battery device 13 and the dust collector 16. The activated carbon spraying eliminates dioxins in the flue gas, and then the spark arrester 15 strengthens the full mixing of the activated carbon and the flue gas, and filters out sparks and large particles of smoke in the flue gas.

[0073] According to one embodiment of the present invention, Figure 1As shown, a muffler 18 and an exhaust pipe 19 are provided on the pipe connected to the outlet end of the dust collector 16. The gas purified by the bag dust collector is discharged into the atmosphere through the exhaust pipe 19 after being silenced by the muffler 18 by the fan 17.

[0074] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flue gas dust removal waste heat recovery system, characterized in that: The flue gas dust removal waste heat recovery system comprises a combustion settling chamber (12), a Carnot battery device (13) and a dust collector (16) which are sequentially arranged along the flue gas flow direction; The Carnot battery device (13) comprises: a heat exchanger (20) disposed on a pipeline between the combustion settling chamber (12) and the dust collector (16); A charging unit (30) connected to the heat exchanger (20); An energy storage unit (40) connected to the charging unit (30), the energy storage unit (40) comprising a high-temperature energy storage module and a low-temperature energy storage module, the high-temperature energy storage module and the low-temperature energy storage module storing heat storage media at different temperatures, the high-temperature energy storage module and the low-temperature energy storage module being in communication; A discharge unit (50) is connected to the energy storage unit (40); the charging unit (30) and the discharge unit (50) are both connected to a power grid (70); When the power grid (70) is under low load, the charging unit (30) can utilize surplus power to store the heat transferred from the heat exchanger (20) to the charging unit (30) in the high-temperature energy storage module; when the power grid (70) is under high load, the discharging unit (50) can use the heat stored in the high-temperature energy storage module to generate electricity and supply it to the power grid (70).

2. The flue gas dust removal waste heat recovery system according to claim 1 is characterized in that: The Carnot battery device (13) further comprises: A solar power generation unit (60) is connected to the charging unit (30), and the charging unit (30) can use the power provided by the solar power generation unit (60) to store the heat transferred from the heat exchanger (20) to the charging unit (30) in the high-temperature energy storage module.

3. The flue gas dust removal waste heat recovery system according to claim 2 is characterized in that: The solar power generation unit (60) is also connected to the power grid (70).

4. The flue gas dust removal waste heat recovery system according to claim 1, characterized in that: The heat exchanger (20) is connected to a heat exchange circulation pipe (21), and the heat exchange circulation pipe (21) is connected to the charging unit (30) through a first evaporator (32).

5. The flue gas dust removal waste heat recovery system according to claim 4 is characterized in that: The charging unit (30) has a charging circulation pipe (31); the first evaporator (32) is connected between the heat exchange circulation pipe (21) and the charging circulation pipe (31); a compressor (33) is provided on the charging circulation pipe (31); the power grid (70) is connected to the compressor (33); the charging circulation pipe (31) is connected to the energy storage unit (40) via a first condenser (34).

6. The flue gas dust removal waste heat recovery system according to claim 5, characterized in that: The energy storage unit (40) has an energy storage circulation pipe (41); the first condenser (34) is connected between the charging circulation pipe (31) and the energy storage circulation pipe (41); the high-temperature energy storage module and the low-temperature energy storage module are respectively arranged on the energy storage circulation pipe (41) on both sides of the first condenser (34); and the energy storage circulation pipe (41) is connected to the discharge unit (50) via a second evaporator (52).

7. The flue gas dust removal waste heat recovery system according to claim 6, characterized in that: The discharge unit (50) has a discharge circulation pipe (51); the second evaporator (52) is connected between the energy storage circulation pipe (41) and the discharge circulation pipe (51); an expander (53) is provided on the discharge circulation pipe (51), and the expander (53) is connected to the power grid (70); the discharge circulation pipe (51) is connected to a cooling water pipe (56) via a second condenser (54).

8. The flue gas dust removal waste heat recovery system according to claim 2 or 3, characterized in that: The solar power generation unit (60) comprises: Solar panels (61); A storage battery (62) connected to the solar cell panel (61); An inverter (63) is connected to the solar panel (61) and the storage battery (62); the inverter (63) is also connected to the power grid (70) and / or the charging unit (30).

9. The flue gas dust removal waste heat recovery system according to claim 1, characterized in that: A scrap steel preheating device (11) is provided between the combustion settling chamber (12) and the smoke outlet of the electric furnace (10).

10. The flue gas dust removal waste heat recovery system according to claim 1, characterized in that: An activated carbon spraying device (14) and a spark arrester (15) are provided on the pipeline between the Carnot battery device (13) and the dust collector (16).

11. The flue gas dust removal waste heat recovery system according to claim 1, characterized in that: A muffler (18) and an exhaust pipe (19) are provided on the pipeline connected to the outlet end of the dust collector (16).

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