Photovoltaic and air source heat pump coupled heat recovery system and method using flue gas waste heat of dust removal system

Abstract

The application discloses a photovoltaic and air source heat pump coupling heat recovery system and method using flue gas waste heat of a dust removal system, and relates to the field of dust removal system energy recovery.The photovoltaic and air source heat pump coupling heat recovery system using flue gas waste heat of the dust removal system comprises a first heat exchanger, a heat pump system, and a solar power generation system.The first heat exchanger comprises a first heat exchange flow channel and a second heat exchange flow channel, and the first heat exchange flow channel is used for receiving flue gas output by a dust remover.The heat pump system comprises a compressor, an evaporator, a throttling unit, and a condenser with a third heat exchange flow channel and a fourth heat exchange flow channel.The third heat exchange flow channel and the fourth heat exchange flow channel can exchange heat, the compressor, the evaporator, the throttling unit and the third heat exchange flow channel are sequentially connected to form a first circulation flow channel, and the outlet of the second heat exchange flow channel can communicate with the fourth heat exchange flow channel.The solar power generation system is used for supplying power to the compressor.The application can solve the problems of incomplete flue gas waste heat recovery and low recovery rate of the existing dust removal system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of dust removal system energy recovery, in particular to a photovoltaic and air source heat pump coupled heat recovery system and method using flue gas waste heat of a dust removal system. BACKGROUND

[0002] As a clean energy application mode that is vigorously promoted, air source heat pump has no carbon emissions, can effectively reduce air pollution and haze, and can produce 2-3 times of heat per degree of electricity, which is a high-efficiency and energy-saving high-quality scheme for replacing coal-fired and gas-fired boilers to achieve clean heating. In recent years, in order to promote energy saving and emission reduction, air source heat pumps can be used in many areas to replace traditional coal-fired small boilers.

[0003] In recent years, with the enhancement of social environmental protection consciousness, new energy photovoltaic power generation as a kind of environmental protection and low cost power generation technology has been widely applied. Photovoltaic power generation is to use photovoltaic effect to absorb incident sunlight to generate electron-hole pairs, and under the action of the built-in electric field of the semiconductor p-n junction, the electron and the hole move to the positive and negative electrodes respectively to form an electric current. It is composed of component array, inverter, controller and the like. According to the type of battery component used, it can be divided into crystalline silicon cells, thin film cells, and concentrated solar cells. The main feature of photovoltaic power generation is that it can be used as a distributed power source, installed near the load, and does not need to be transmitted over long distances. At the same time, it can be installed modularly, with a scale of any size, and can be installed on the roof and wall without occupying land. Photovoltaic power generation coincides with the peak of daytime electricity consumption, so it can enjoy peak electricity prices and also reduce the peak of the power grid.

[0004] In addition, there are a large number of industrial waste heat in industrial production, and fully recovering and utilizing these heat energy has great potential to improve energy utilization efficiency. In particular, in the steel industry, large-scale dust removal systems are set up to meet environmental protection requirements, and a large amount of waste heat generated by the process is discharged into the atmosphere with dust-containing flue gas. The utilization of this part of waste heat is of great significance. SUMMARY

[0005] At present, the flue gas waste heat at the inlet of the hot water recovery electrostatic precipitator is recovered, and the obtained hot water is used to heat the ash hopper of the electrostatic precipitator to improve the flowability of the dust in the ash hopper. The applicant found that recovering the flue gas waste heat in front of the dust remover would affect the heat exchange of the heat recovery equipment, thereby shortening the service life of the heat recovery equipment. Moreover, the traditional heat exchanger is used for waste heat recovery, and the heat is directly utilized, so the recovery efficiency is not high, and the utilization rate of the recovered heat is also low.

[0006] In addition, there is also a new type of flue gas waste heat recovery method, that is, a plate heat exchanger is arranged in the bag-type dust collector, the flue gas is once heat-exchanged, the flue gas at the outlet of the dust collector is twice heat-exchanged with the hot water after once heat-exchange, and the flue gas waste heat is recovered through two-stage heat exchange. The applicant finds that this method needs to arrange a plate heat exchanger in the dust collector, so that the resistance of the dust collector is increased, the system power consumption is increased, and the increase of the system power consumption may be more than the low-temperature waste heat recovered. Moreover, the plate heat exchanger is arranged in the dust collector, the dust-containing flue gas affects heat exchange of the heat recovery equipment, and the service life of the heat recovery equipment is shortened. In addition, the flue gas at the outlet of the dust collector is heat-exchanged with the heat water tank, which is only applicable to small dust collectors. For large dust collectors used in the metallurgical industry and power plants, the outlet pipeline of the dust collector is thick, and the scheme is not applicable.

[0007] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiment of the present application is to provide a photovoltaic and air source heat pump coupled heat recovery system and method using flue gas waste heat of a dust removal system, which can solve the problems of incomplete flue gas waste heat recovery and low recovery rate of the existing dust removal system.

[0008] The specific technical scheme of the embodiment of the present application is:

[0009] A photovoltaic and air source heat pump coupled heat recovery system using flue gas waste heat of a dust removal system, the photovoltaic and air source heat pump coupled heat recovery system using flue gas waste heat of a dust removal system comprises:

[0010] A first heat exchanger, the first heat exchanger comprises a first heat exchange flow channel and a second heat exchange flow channel capable of heat exchange, and the first heat exchange flow channel is used for receiving flue gas output by a dust collector;

[0011] A heat pump system, the heat pump system comprises a compressor, an evaporator, a throttling unit and a condenser with a third heat exchange flow channel and a fourth heat exchange flow channel capable of heat exchange, the compressor, the evaporator, the throttling unit and the third heat exchange flow channel are sequentially connected to form a first circulation flow channel, and an outlet of the second heat exchange flow channel is in communication with the fourth heat exchange flow channel;

[0012] A solar power generation system, the solar power generation system is used for supplying power to the compressor.

[0013] Preferably, the photovoltaic and air source heat pump coupled heat recovery system using flue gas waste heat of a dust removal system further comprises:

[0014] A heat storage tank, the heat storage tank is connected between the outlet of the second heat exchange flow channel and the inlet of the fourth heat exchange flow channel.

[0015] Preferably, the photovoltaic and air source heat pump coupled heat recovery system using flue gas waste heat of a dust removal system comprises:

[0016] an output port, which is in communication with an outlet of the fourth heat exchange channel;

[0017] an input port, which is in communication with an inlet of the second heat exchange channel.

[0018] Preferably, the output port and the input port are respectively used to communicate with the inlet and the outlet of the heating terminal device.

[0019] Preferably, the photovoltaic and air source heat pump coupled heat recovery system using flue gas waste heat of a dust removal system comprises:

[0020] a driving pump, which is used to drive the fluid in the heat storage box to flow towards the fourth heat exchange channel.

[0021] Preferably, the outlet of the heat storage box is in communication with the fourth heat exchange channel through a first pipeline, and a first on-off valve is arranged on the first pipeline.

[0022] The outlet of the heat storage box is in communication with the output port through a second pipeline, and a second on-off valve is arranged on the second pipeline.

[0023] Preferably, the solar power generation system comprises:

[0024] a solar cell panel;

[0025] an inverter, a direct current end of which is electrically connected with the solar cell panel, and an alternating current end of which is electrically connected with the compressor.

[0026] Preferably, the solar power generation system comprises:

[0027] a power storage unit, an input end of which is electrically connected with the solar cell panel, and an output end of which is electrically connected with the direct current end of the inverter.

[0028] Preferably, the photovoltaic and air source heat pump coupled heat recovery system using flue gas waste heat of a dust removal system comprises:

[0029] a power input end, which is used to be electrically connected with a power grid, and which is electrically connected with the compressor;

[0030] an electric output end, which is electrically connected with the alternating current end of the inverter, and which is used to supply power to the power grid.

[0031] Preferably, the photovoltaic and air source heat pump coupled heat recovery system using flue gas waste heat of a dust removal system has two operating states:

[0032] In the first operating state, the first on-off valve is in an open state, the second on-off valve is in a closed state, the drive pump is in an operating state, and the compressor is in an operating state.

[0033] In the second operating state, the first on-off valve is in a closed state, the second on-off valve is in an open state, the drive pump is in an operating state, and the compressor is in a closed state.

[0034] Preferably, the evaporator has a fifth heat exchange channel and a sixth heat exchange channel, the fifth heat exchange channel and the sixth heat exchange channel can exchange heat, the compressor, the fifth heat exchange channel, the throttling unit and the third heat exchange channel are sequentially connected to form a first circulating channel, and the sixth heat exchange channel can communicate with the outlet of the first heat exchange channel.

[0035] A dust removal system, comprising:

[0036] A bag-type dust collector, which is a bag-type dust collector in at least one of the following dust removal systems in a steel production process: a cast house dust removal system, an electric furnace primary dust removal system, a converter secondary dust removal system, a refining dust removal system, a desulfurization dust removal system, and a tank dumping dust removal system.

[0037] The photovoltaic and air source heat pump coupled heat recovery system using flue gas waste heat of a dust removal system according to any one of the above, wherein the inlet of the first heat exchange channel communicates with the outlet of the bag-type dust collector.

[0038] A fan and an exhaust chimney connected in sequence, wherein the inlet of the fan communicates with the outlet of the first heat exchange channel.

[0039] A photovoltaic and air source heat pump coupled heat recovery method using flue gas waste heat of a dust removal system, comprising:

[0040] Direct current generated by a solar panel is converted into alternating current by an inverter, and then used to power a compressor of a heat pump system.

[0041] Flue gas output by a dust collector is preliminarily heated by a first heat exchanger for heat exchange fluid flowing therethrough.

[0042] The preliminarily heated heat exchange fluid is secondarily heated by a condenser of the heat pump system.

[0043] The secondarily heated heat exchange fluid is supplied to a heating terminal device.

[0044] Preferably, the temperature of the flue gas output by the dust collector is between 80 degrees Celsius and 120 degrees Celsius, and the temperature of the flue gas output after heat exchange by the first heat exchanger is less than or equal to 30 degrees Celsius.

[0045] Preferably, the direct current generated by the solar panel is converted into alternating current by the inverter to power the compressor of the heat pump system, comprising:

[0046] When the compressor of the heat pump system is running and the solar panel is generating electricity under illumination, the direct current generated by the solar panel is converted into alternating current by the inverter to power the compressor of the heat pump system.

[0047] When the solar panel is generating electricity under illumination and the compressor of the heat pump system is not running, the direct current generated by the solar panel is stored by the power storage unit.

[0048] When the solar panel is not generating electricity and the compressor of the heat pump system is running, the direct current output by the power storage unit is converted into alternating current by the inverter to power the compressor of the heat pump system.

[0049] When the solar panel is not generating electricity, the compressor of the heat pump system is running, and the power storage unit is insufficient, the power grid is used to power the compressor of the heat pump system.

[0050] When the solar panel is generating electricity under illumination, the compressor of the heat pump system is not running, and the power storage unit is fully charged, the direct current generated by the solar panel is converted into alternating current by the inverter to power the power grid.

[0051] Preferably, the photovoltaic and air source heat pump coupling heat recovery method using flue gas waste heat of a dust removal system comprises:

[0052] When the compressor of the heat pump system is not running, the heat exchange fluid after preliminary heating is directly supplied to the heating terminal device.

[0053] The technical scheme of the present application has the following remarkable beneficial effects:

[0054] The present application utilizes the first heat exchanger to recover the waste heat of the flue gas output by the dust collector, the second heat exchange flow channel of the first heat exchanger outputs the heat exchange fluid which is preliminarily heated, and the heat exchange fluid is transported into the fourth heat exchange flow channel of the condenser of the heat pump system for secondary heating, so that the heat exchange fluid with higher temperature is obtained, and the heat exchange fluid with higher temperature can be used for supplying the heating terminal equipment. The operation of the compressor of the heat pump system is powered by the solar power generation system, so that the power supply from the power grid is reduced or avoided. Since the heat exchange fluid output by the second heat exchange flow channel of the first heat exchanger only needs to be preliminarily heated, the temperature of the output does not need to be very high, and therefore a large amount of low-temperature heat exchange fluid can be used, thereby greatly improving the cooling effect of the flue gas, making the cooling range of the flue gas higher, and the temperature of the flue gas output from the first heat exchange flow channel of the first heat exchanger can reach a very low level, below 30 degrees Celsius, close to normal temperature, so that the waste heat recovery of the flue gas is more complete. Through the above process, the problem that the existing dust removal system is not complete in recovering the waste heat of the flue gas can be solved, the maximization of the utilization of the waste heat of the flue gas is realized, and the heat exchange fluid output by the second heat exchange flow channel of the first heat exchanger can be further heated by the heat pump with higher heating efficiency in the system, so that the heat exchange fluid has actual utilization value.

[0055] Specific embodiments of the application are disclosed herein, and represent several possible ways of implementing the principles of the application. It should be understood that the application is not limited to these embodiments, and that other embodiments can be implemented in similar ways, or in other ways that are apparent from the teachings of the present disclosure. Features described and / or illustrated with respect to one embodiment can be used in the same or similar way in one or more other embodiments, in combination with features of other embodiments, or in place of features of other embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0056] The drawings described herein are for purposes of illustration only and are not intended to limit the scope of the present disclosure in any way. Additionally, the shapes and relative sizes of the components in the drawings are meant to be illustrative and not necessarily to scale, and are not intended to limit the scope of the application in any way. Those skilled in the art will recognize that various modifications can be made to the embodiments described herein, and that such modifications are intended to be within the scope of the present application.

[0057] Figure 1 A system schematic diagram of a photovoltaic and air source heat pump coupled heat recovery system utilizing the waste heat of the flue gas of a dust removal system in an embodiment of the present application and a bag type dust collector;

[0058] Figure 2 A structure schematic diagram of a photovoltaic and air source heat pump coupled heat recovery system utilizing the waste heat of the flue gas of a dust removal system in an embodiment of the present application in a first embodiment;

[0059] Figure 3This is a schematic diagram of the photovoltaic and air source heat pump coupled heat recovery system utilizing the waste heat of flue gas from the dust removal system in a second embodiment of the present invention.

[0060] The reference numerals in the above figures are as follows:

[0061] 1. First heat exchanger; 11. First heat exchange channel; 12. Second heat exchange channel; 2. Heat pump system; 21. Compressor; 22. Evaporator; 221. Fifth heat exchange channel; 222. Sixth heat exchange channel; 23. Throttling unit; 24. Condenser; 241. Third heat exchange channel; 242. Fourth heat exchange channel; 25. Liquid storage tank; 26. Gas-liquid separator; 3. Solar power generation system; 31. Solar panel; 3 2. Inverter; 33. Energy storage unit; 4. Heat storage tank; 51. Output port; 52. Input port; 61. Power input terminal; 62. Power output terminal; 8. Drive pump; 91. First on / off valve; 92. Second on / off valve; 10. Heating terminal equipment; 100. Bag filter; 200. Photovoltaic and air source heat pump coupled heat recovery system utilizing waste heat from flue gas in dust removal system; 300. Fan; 400. Exhaust chimney. Detailed Implementation

[0062] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0064] In order to solve the problem of incomplete flue gas waste heat recovery and low recovery rate of the existing dust removal system, a photovoltaic and air source heat pump coupled heat recovery system 200 using flue gas waste heat of the dust removal system is provided in the application, Figure 1 For the system schematic diagram of the photovoltaic and air source heat pump coupled heat recovery system using flue gas waste heat of the dust removal system in the embodiment of the application and the bag type dust collector, Figure 2 For the structure schematic diagram of the photovoltaic and air source heat pump coupled heat recovery system using flue gas waste heat of the dust removal system in the first embodiment of the application, as shown in Figure 1 And Figure 2 As shown in the figure, the photovoltaic and air source heat pump coupled heat recovery system 200 using flue gas waste heat of the dust removal system can include: a first heat exchanger 1, the first heat exchanger 1 includes a first heat exchange flow channel 11 and a second heat exchange flow channel 12 capable of heat exchange, the first heat exchange flow channel 11 is used for receiving flue gas output by the dust collector; a heat pump system 2, the heat pump system 2 includes: a compressor 21, an evaporator 22, a throttling unit 23 and a condenser 24 with a third heat exchange flow channel 241 and a fourth heat exchange flow channel 242, the third heat exchange flow channel 241 and the fourth heat exchange flow channel 242 can heat exchange, the compressor 21, the evaporator 22, the throttling unit 23 and the third heat exchange flow channel 241 are connected in sequence to form a first circulating flow channel, the outlet of the second heat exchange flow channel 12 can communicate with the fourth heat exchange flow channel 242; a solar power generation system 3, the solar power generation system 3 is used for supplying power to the compressor 21.

[0065] The present application utilizes the first heat exchanger 1 to recover the waste heat of the flue gas output by the dust collector, the second heat exchange channel 12 of the first heat exchanger 1 outputs the preliminarily heated heat exchange fluid to the fourth heat exchange channel 242 of the condenser 24 of the heat pump system 2 for secondary heating, so as to obtain heat exchange fluid with higher temperature, and the heat exchange fluid with higher temperature can be used to supply the heating terminal device 10. The operation of the compressor 21 of the heat pump system 2 is powered by the solar power generation system 3, so as to reduce or avoid the power supply from the power grid. Since the heat exchange fluid output by the second heat exchange channel 12 of the first heat exchanger 1 only needs to be preliminarily heated, the output temperature does not need to be very high, and therefore a large amount of low-temperature heat exchange fluid can be used, so as to greatly improve the cooling effect of the flue gas, so that the cooling range of the flue gas is higher, and the temperature of the flue gas output from the first heat exchange channel 11 of the first heat exchanger 1 can be as low as below 30 degrees Celsius, close to the normal temperature, so that the waste heat recovery of the flue gas is more complete. Through the above process, the problem that the existing dust removal system does not completely recover the waste heat of the flue gas can be solved, the maximization of the utilization of the waste heat of the flue gas is realized, and the preliminarily heated heat exchange fluid output by the second heat exchange channel 12 of the first heat exchanger 1 can be further heated by the heat pump with higher heating efficiency in the system, so as to make the heat exchange fluid have actual utilization value.

[0066] As shown in Figure 2 The first heat exchanger 1 includes the first heat exchange channel 11 and the second heat exchange channel 12 capable of heat exchange, the first heat exchange channel 11 is used to receive the flue gas output by the dust collector, so as to recover and utilize the waste heat of the flue gas at the outlet of the dust collector. By selecting the flue gas discharged at the outlet of the dust collector, the equipment investment can be reduced and the service life of the equipment can be improved.

[0067] The photovoltaic and air source heat pump coupled heat recovery system 200 utilizing the waste heat of the flue gas of the dust removal system in the present application can be applied to the flue gas output by the ordinary bag filter, filter cartridge dust collector, high-temperature bag filter and electric dust collector. Among them, the ordinary bag filter or filter cartridge dust collector can withstand a temperature of 130℃, after treating the flue gas with higher temperature, the temperature of the flue gas at the outlet of the dust collector is about 80℃ to 120℃; the high-temperature bag filter can withstand a temperature of 280℃, after treating the flue gas with higher temperature, the temperature of the flue gas at the outlet of the dust collector is about 180℃ to 220℃, and when the temperature of the flue gas at the outlet of the electric dust collector is >80℃, the recovery efficiency is also high. As a preferred, since the outlet flue gas temperature of some dust collectors is relatively low, the degree of waste heat recovery of other energy recovery systems is low, the photovoltaic and air source heat pump coupled heat recovery system 200 utilizing the waste heat of the flue gas of the dust removal system in the present application can effectively be applied to the ordinary bag filter and filter cartridge dust collector to improve the degree of waste heat recovery of the flue gas.

[0068] Taking a common cloth bag dust removal system as an example, when treating high-temperature flue gas (such as converter secondary flue gas, refining dust removal flue gas, desulfurization and dephosphorization dust removal flue gas, and inverted tank dust removal flue gas), the dust-containing high-temperature flue gas enters the common cloth bag dust remover for purification through a dust removal hood, a regulating valve, and a pipeline. The temperature of the purified flue gas is about 80-120°C. A photovoltaic and air source heat pump coupled heat recovery system 200 using the flue gas waste heat of the dust removal system can be added at the outlet of the common cloth bag dust remover, as shown in FIG. 1. The waste heat of the flue gas is recovered and then discharged into the atmosphere through a fan 300, a silencer, and an exhaust chimney 400. Figure 1

[0069] The inlet of the second heat exchange channel 12 of the first heat exchanger 1 is used for inputting heat exchange fluid, so that the heat exchange fluid is heated by the flue gas to recover the waste heat in the flue gas. The heat exchange fluid output by the second heat exchange channel 12 of the first heat exchanger 1 can only need to be preliminarily heated, and the output temperature does not need to be very high. Therefore, a large amount of low-temperature heat exchange fluid can be used, thereby greatly improving the cooling effect of the flue gas and making the cooling range of the flue gas higher. The temperature of the flue gas output from the first heat exchange channel 11 of the first heat exchanger 1 can reach a very low level, which can be below 30°C, close to the normal temperature, so that the waste heat recovery of the flue gas is more complete.

[0070] Since the temperature of the heat exchange fluid after passing through the second heat exchange channel 12 of the first heat exchanger 1 is relatively low, the heat exchange fluid at this temperature does not have much practical value. For example, the conventional heating terminal device 10 cannot use the heat exchange fluid at this low temperature. Therefore, the heat exchange fluid needs to be heated again to improve its practical value. Therefore, the heat exchange fluid output by the second heat exchange channel 12 can be heated again by the heat pump system 2.

[0071] The heat pump system 2 can include a compressor 21, an evaporator 22, a throttling unit 23, and a condenser 24 having a third heat exchange channel 241 and a fourth heat exchange channel 242. The third heat exchange channel 241 and the fourth heat exchange channel 242 can exchange heat. The compressor 21, the evaporator 22, the throttling unit 23, and the third heat exchange channel 241 are sequentially connected to form a first circulation channel. The outlet of the second heat exchange channel 12 can communicate with the fourth heat exchange channel 242. The heat exchange fluid output by the second heat exchange channel 12 flows into the fourth heat exchange channel 242 for secondary heating. The temperature of the heat exchange fluid flowing out of the fourth heat exchange channel 242 is increased, so that the part of the heat exchange fluid has a certain practical value and can be supplied to the heating terminal device 10 for use. Further, a liquid storage tank 25 can be provided on the first circulation channel, which is used to store refrigerant. The liquid storage tank 25 can be located between the outlet of the compressor 21 and the throttling unit 23. A gas-liquid separator 26 can also be provided on the first circulation channel, which can be located between the inlet of the compressor 21 and the evaporator 22.​

[0072] The energy input of the heat pump system 2 is the electric energy input of the compressor 21 and the energy input of heat exchange with the ambient gas at the evaporator 22. In order to reduce the electric energy input of the photovoltaic and air source heat pump coupled heat recovery system 200 using the flue gas waste heat of the dust removal system from the power grid, to reduce the operating cost, the solar power generation system 3 is used to supply power to the compressor 21. The solar power generation system 3 can include: a solar panel 31; an inverter 32, the direct current end of the inverter 32 is electrically connected with the solar panel 31, and the alternating current end of the inverter 32 is electrically connected with the compressor 21. The direct current generated by the solar panel 31 is converted into alternating current by the inverter 32 and then supplied to the compressor 21.

[0073] As feasible, the solar power generation system 3 can include: a power storage unit 33, the input end of which is electrically connected with the solar panel 31, and the output end of which is electrically connected with the direct current end of the inverter 32. When the solar panel 31 generates more electricity, or the compressor 21 does not operate, the excess electricity can be input into the power storage unit 33 for storage. When the solar panel 31 generates insufficient electricity, the compressor 21 can be powered in combination with the power storage unit 33.

[0074] The photovoltaic and air source heat pump coupled heat recovery system 200 using the flue gas waste heat of the dust removal system can include: a power input end 61 for electrically connecting with the power grid A, the power input end 61 being electrically connected with the compressor 21; an electric output end 62, the electric output end 62 being electrically connected with the alternating current end of the inverter 32, the electric output end 62 being used for supplying power to the power grid. When the solar panel 31 generates more electricity, or the compressor 21 does not operate, the excess electricity can be converted into alternating current by the inverter 32 and then supplied to the power grid. When the solar panel 31 does not generate electricity, and the electricity of the power storage unit 33 is also exhausted, the compressor 21 can be directly powered by the power grid.

[0075] The photovoltaic and air source heat pump coupled heat recovery system 200 using the flue gas waste heat of the dust removal system further includes: a heat storage box 4 connected between the outlet of the second heat exchange flow channel 12 and the inlet of the fourth heat exchange flow channel 242. A large amount of heat exchange fluid can be contained in the heat storage box 4, so that the purpose of heat storage can be achieved, and the temperature of the heat exchange fluid input into the fourth heat exchange flow channel 242 can be more stable.

[0076] The photovoltaic and air source heat pump coupled heat recovery system 200 using flue gas waste heat of dust removal system can comprise: an output port 51, the output port 51 is communicated with the outlet of the fourth heat exchange flow channel 242; an input port 52, the input port 52 is communicated with the inlet of the second heat exchange flow channel 12. The heat exchange fluid can be input from the input port 52 to the photovoltaic and air source heat pump coupled heat recovery system 200 using flue gas waste heat of dust removal system, and the heat exchange fluid is output from the output port 51 after primary heating and secondary heating, thereby supplying the heating terminal device 10 for use. The heating terminal device 10 can at least comprise one of the following: air curtain, wall-mounted air conditioner, fan 300 coil, radiator, floor heating coil, and the like.

[0077] In order to achieve the purpose of recycling the heat exchange fluid output from the output port 51, save the heat exchange fluid, and improve the temperature of the heat exchange fluid input to the input port 52, the output port 51 and the input port 52 are respectively used to communicate with the inlet and outlet of the heating terminal device 10, so that the heat exchange fluid output from the output port 51 can flow back to the input port 52 after supplying at least part of the heat to the heating terminal device 10. In order to drive the heat exchange fluid to circulate between the heating terminal device 10, the second heat exchange flow channel 12, the fourth heat exchange flow channel 242, and the heat storage tank 4, the photovoltaic and air source heat pump coupled heat recovery system 200 using flue gas waste heat of dust removal system can comprise: a drive pump 8, the drive pump 8 is used to drive the fluid in the heat storage tank 4 to flow in the direction of the fourth heat exchange flow channel 242.

[0078] As feasible, the outlet of the heat storage tank 4 is communicated with the fourth heat exchange flow channel 242 through a first pipeline, and a first on-off valve 91 is arranged on the first pipeline. The outlet of the heat storage tank 4 is communicated with the output port 51 through a second pipeline, and a second on-off valve 92 is arranged on the second pipeline. Correspondingly, the photovoltaic and air source heat pump coupled heat recovery system 200 using flue gas waste heat of dust removal system can have two operating states: in the first operating state, the first on-off valve 91 is in the open state, the second on-off valve 92 is in the closed state, the drive pump 8 is in the operating state, and the compressor 21 is in the operating state; in the second operating state, the first on-off valve 91 is in the closed state, the second on-off valve 92 is in the open state, the drive pump 8 is in the operating state, and the compressor 21 is in the closed state.

[0079] When the temperature of the heat exchange fluid heated by the second heat exchange channel 12 of the first heat exchanger 1 is not high enough, the photovoltaic and air source heat pump coupled heat recovery system 200 using flue gas waste heat of the dust removal system can be switched to the first operating state, so as to perform secondary heating by the fourth heat exchange channel 242 of the condenser 24 of the heat pump system 2. When the temperature of the heat exchange fluid heated by the second heat exchange channel 12 of the first heat exchanger 1 is high enough, the photovoltaic and air source heat pump coupled heat recovery system 200 using flue gas waste heat of the dust removal system can be switched to the second operating state, and the heat exchange fluid heated by the second heat exchange channel 12 of the first heat exchanger 1 is directly output from the output port 51 to supply the heating terminal device 10.

[0080] Further, Figure 3 The structure of the photovoltaic and air source heat pump coupled heat recovery system using flue gas waste heat of the dust removal system in the second embodiment of the present application is shown in FIG. 6. Figure 3 As shown in FIG. 6, the evaporator 22 can have a fifth heat exchange channel 221 and a sixth heat exchange channel 222. The fifth heat exchange channel 221 and the sixth heat exchange channel 222 can exchange heat. The compressor 21, the fifth heat exchange channel 221, the throttling unit 23, and the third heat exchange channel 241 are connected in sequence to form a first circulation channel. The sixth heat exchange channel 222 can communicate with the outlet of the first heat exchange channel 11. Because the temperature of the air in nature is relatively low in winter or late autumn, which is much lower than the temperature of the flue gas discharged after heat exchange of the first heat exchange channel 11, the evaporator 22 of the heat pump system 2 can be heated by using the part of the flue gas. Therefore, the flue gas discharged after heat exchange of the first heat exchange channel 11 is input into the sixth heat exchange channel 222 of the evaporator 22, so as to heat the refrigerant flowing through the fifth heat exchange channel 221 of the evaporator 22. Because the temperature of the gas exchanged with the outside of the evaporator 22 is further increased, especially in winter or late autumn, the COP of the heat pump system 2 can be greatly improved, and the conversion efficiency of heat energy is greatly improved.

[0081] In other feasible embodiments, the flue gas output by the dust remover can be directly input into the sixth heat exchange channel 222 of the evaporator 22, which can further greatly improve the COP of the heat pump system 2.

[0082] As Figure 1As shown, the application also proposes a dust removal system, which can include: a bag filter 100, the bag filter 100 being a bag filter 100 in at least one of the following dust removal systems in the steel production process: a casthouse dust removal system, an electric furnace primary dust removal system, a converter secondary dust removal system, a refining dust removal system, a desulfurization dust removal system, and a ladle reversing dust removal system; the photovoltaic and air source heat pump coupled heat recovery system 200 using flue gas waste heat of the dust removal system according to any one of the above, the inlet of the first heat exchange flow channel 11 being in communication with the outlet of the bag filter 100; a fan 300 and an exhaust stack 400 connected in sequence, the inlet of the fan 300 being in communication with the outlet of the first heat exchange flow channel 11.

[0083] The application also proposes a photovoltaic and air source heat pump coupled heat recovery method using flue gas waste heat of a dust removal system, which can include:

[0084] The direct current generated by the solar panel 31 is converted into alternating current by the inverter 32 to supply power to the compressor 21 of the heat pump system 2.

[0085] In this step, when the compressor 21 of the heat pump system 2 is running and the solar panel 31 is generating electricity under illumination, the direct current generated by the solar panel 31 is converted into alternating current by the inverter 32 to supply power to the compressor 21 of the heat pump system 2; when the solar panel 31 is generating electricity under illumination and the compressor 21 of the heat pump system 2 is not running, the direct current generated by the solar panel 31 is stored by the power storage unit 33; when the solar panel 31 is not generating electricity and the compressor 21 of the heat pump system 2 is running, the direct current output by the power storage unit 33 is converted into alternating current by the inverter 32 to supply power to the compressor 21 of the heat pump system 2; when the solar panel 31 is not generating electricity, the compressor 21 of the heat pump system 2 is running, and the power storage unit 33 is insufficient, the power grid is used to supply power to the compressor 21 of the heat pump system 2; when the solar panel 31 is generating electricity under illumination, the compressor 21 of the heat pump system 2 is not running, and the power storage unit 33 is in a full state, the direct current generated by the solar panel 31 is converted into alternating current by the inverter 32 to supply power to the power grid.

[0086] The flue gas output by the dust remover is preliminarily heated by the first heat exchanger 1 to the heat exchange fluid flowing therethrough.

[0087] In this step, the flue gas output by the dust remover is introduced into the first heat exchange flow channel 11 of the first heat exchanger 1, thereby preliminarily heating the heat exchange fluid flowing through the second heat exchange flow channel 12 of the first heat exchanger 1.

[0088] As feasible, the temperature of the flue gas output by the dust collector can be between 80 degrees Celsius and 120 degrees Celsius, and the temperature of the flue gas output after heat exchange by the first heat exchanger 1 is less than or equal to 30 degrees Celsius. Such a dust collector is especially suitable for ordinary bag-type dust collectors and filter cartridge dust collectors.

[0089] The preliminarily heated heat exchange fluid is secondarily heated by the condenser 24 of the heat pump system 2.

[0090] The secondarily heated heat exchange fluid is supplied to the heating terminal device 10.

[0091] In this step, the heat exchange fluid can be returned to the second heat exchange channel 12 of the first heat exchanger 1 after being heated by the heating terminal device 10.

[0092] In other feasible embodiments, the photovoltaic and air source heat pump coupled heat recovery method using flue gas waste heat of a dust removal system comprises:

[0093] When the compressor 21 of the heat pump system 2 is not running, the preliminarily heated heat exchange fluid is directly supplied to the heating terminal device 10.

[0094] The present application can recycle the waste heat of the flue gas discharged by the dust collector in the dust removal system to preliminarily heat the heat exchange fluid. Since the heating temperature does not need to be very high, a large amount of low-temperature heat exchange fluid can be used to greatly improve the cooling effect of the flue gas, so that the cooling range of the flue gas is higher, and the temperature of the flue gas output from the first heat exchange channel 11 of the first heat exchanger 1 can reach a very low level, which can be below 30 degrees Celsius, close to normal temperature, so that the waste heat recovery of the flue gas is more complete. Then, the heat pump with higher heating efficiency in the system can further secondarily heat the preliminarily heated heat exchange fluid output from the second heat exchange channel 12 of the first heat exchanger 1 to a higher temperature, so that the heat exchange fluid has actual utilization value. Through the above-mentioned mode, the maximum utilization of flue gas waste heat can be realized, and the low-temperature heat energy of the heat exchange fluid can be converted into high-temperature heat energy with higher quality to meet the heating and process requirements.

[0095] The system can use renewable energy solar power to supply the heat pump, and cooperate with the high-efficiency heating device heat pump system 2 to realize low-carbon or zero-carbon emission, which helps to reduce greenhouse gas emissions.

[0096] In addition, the photovoltaic and air source heat pump coupled heat recovery system and method using flue gas waste heat of a dust removal system can cooperate with the power storage unit 33 and the power grid to operate, and suitable power sources can be selected for different situations, and when the solar cell panel 31 generates too much electricity, energy storage or electricity integration into the public power grid can be performed. Overall, the stability of the system can be greatly improved, and the utilization rate of electricity can be improved.

[0097] All articles and references, including patent applications and publications, disclosed herein are hereby incorporated by reference for all purposes. The term "consisting essentially of to describe a combination shall include the elements, ingredients, components or steps identified, and such other elements, ingredients, components or steps that do not materially affect the basic and novel characteristics of the combination. The use of the term "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also is taken to mean that other elements, ingredients, components or steps are optional, and the use of the term "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also is taken to mean that other elements, ingredients, components or steps are optional, and that statements of

[0098] The various embodiments in the specification are described in progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the various embodiments can be mutually referred to. The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A photovoltaic and air-source heat pump coupled heat recovery system utilizing waste heat from flue gas in a dust removal system, characterized in that, The photovoltaic and air-source heat pump coupled heat recovery system that utilizes waste heat from the flue gas of the dust removal system includes: The first heat exchanger includes a first heat exchange channel and a second heat exchange channel capable of heat exchange, wherein the first heat exchange channel is used to receive flue gas output from the dust collector. A heat pump system includes a compressor, an evaporator, a throttling unit, and a condenser having a third heat exchange channel and a fourth heat exchange channel, the third heat exchange channel and the fourth heat exchange channel being capable of heat exchange; the compressor, the evaporator, the throttling unit and the third heat exchange channel are sequentially connected to form a first circulation channel; the outlet of the second heat exchange channel is connected to the fourth heat exchange channel. A solar power generation system, wherein the solar power generation system is used to supply power to the compressor; A heat storage box, which is connected between the outlet of the second heat exchange channel and the inlet of the fourth heat exchange channel; An output port, which is connected to the outlet of the fourth heat exchange channel; An input port, which is connected to the inlet of the second heat exchange channel; A drive pump is provided to drive the fluid in the heat storage tank to flow towards the fourth heat exchange channel; the outlet of the heat storage tank is connected to the fourth heat exchange channel through a first pipeline; a first on / off valve is provided on the first pipeline; the outlet of the heat storage tank is connected to the output port through a second pipeline; a second on / off valve is provided on the second pipeline.

2. The photovoltaic and air source heat pump coupled heat recovery system utilizing waste heat from flue gas in a dust removal system according to claim 1, characterized in that, The output port and input port are used to connect to the inlet and outlet of the heating terminal equipment, respectively.

3. The photovoltaic and air source heat pump coupled heat recovery system utilizing waste heat from flue gas in a dust removal system according to claim 1, characterized in that, The solar power generation system includes: Solar panels; An inverter, wherein the DC terminal of the inverter is electrically connected to the solar panel, and the AC terminal of the inverter is electrically connected to the compressor.

4. The photovoltaic and air source heat pump coupled heat recovery system utilizing waste heat from flue gas in a dust removal system according to claim 3, characterized in that, The solar power generation system includes: The energy storage unit has its input terminal electrically connected to the solar panel and its output terminal electrically connected to the DC terminal of the inverter.

5. The photovoltaic and air source heat pump coupled heat recovery system utilizing waste heat from flue gas in a dust removal system according to claim 3, characterized in that, The photovoltaic and air-source heat pump coupled heat recovery system that utilizes waste heat from the flue gas of the dust removal system includes: A power input terminal is provided for electrical connection to the power grid, and the power input terminal is also electrically connected to the compressor. The electrical output terminal is electrically connected to the AC terminal of the inverter and is used to supply power to the power grid.

6. The photovoltaic and air source heat pump coupled heat recovery system utilizing waste heat from flue gas in a dust removal system according to claim 1, characterized in that, The photovoltaic and air source heat pump coupled heat recovery system that utilizes waste heat from flue gas in the dust removal system has two operating states: In the first operating state, the first on-off valve is in the open state, the second on-off valve is in the closed state, the drive pump is in the operating state, and the compressor is in the operating state. In the second operating state, the first on-off valve is in the closed state, the second on-off valve is in the open state, the drive pump is in the running state, and the compressor is in the closed state.

7. The photovoltaic and air source heat pump coupled heat recovery system utilizing waste heat from flue gas in a dust removal system according to claim 1, characterized in that, The evaporator has a fifth heat exchange channel and a sixth heat exchange channel, which are capable of heat exchange. The compressor, the fifth heat exchange channel, the throttling unit, and the third heat exchange channel are sequentially connected to form a first circulation channel. The sixth heat exchange channel can communicate with the outlet of the first heat exchange channel.

8. A dust removal system, characterized in that, The dust removal system includes: The bag filter is a bag filter used in at least one of the following dust removal systems in the steel production process: iron tapping area dust removal system, electric furnace primary dust removal system, converter secondary dust removal system, refining dust removal system, desulfurization dust removal system, and inverted tank dust removal system. The photovoltaic and air source heat pump coupled heat recovery system for utilizing waste heat from flue gas in a dust removal system as described in any one of claims 1 to 7, wherein the inlet of the first heat exchange channel is connected to the outlet of the bag filter; A fan and an exhaust stack are connected in sequence, with the inlet of the fan connected to the outlet of the first heat exchange channel.

9. A method for photovoltaic and air-source heat pump coupled heat recovery system utilizing waste heat from flue gas of a dust removal system, as described in any one of claims 1 to 7, characterized in that, The photovoltaic and air source heat pump coupled heat recovery method for utilizing waste heat from flue gas in a dust removal system includes: The direct current generated by the solar panels is converted into alternating current by an inverter to power the compressor of the heat pump system. The flue gas output from the dust collector is preheated by the heat exchange fluid flowing through the first heat exchanger. The heat exchange fluid, which has been initially heated, is then reheated via the condenser of the heat pump system. The heat exchange fluid, after secondary heating, is supplied to the heating terminal equipment.

10. The photovoltaic and air source heat pump coupled heat recovery method for utilizing waste heat from flue gas in a dust removal system according to claim 9, characterized in that, The temperature of the flue gas output by the dust collector is between 80 degrees Celsius and 120 degrees Celsius, and the temperature of the flue gas output after heat exchange through the first heat exchanger is less than or equal to 30 degrees Celsius.

11. The photovoltaic and air source heat pump coupled heat recovery method for utilizing waste heat from flue gas in a dust removal system according to claim 9, characterized in that, The direct current (DC) generated by the solar panels is converted into alternating current (AC) by an inverter to power the compressor of the heat pump system, including: When the compressor of the heat pump system is running and the solar panel generates electricity under sunlight, the direct current generated by the solar panel is converted into alternating current by the inverter to power the compressor of the heat pump system. When the solar panel generates electricity from sunlight and the compressor of the heat pump system is not running, the direct current generated by the solar panel is stored through the energy storage unit. When the solar panel is not generating electricity and the compressor of the heat pump system is running, the DC power output by the energy storage unit is converted into AC power by the inverter and then used to power the compressor of the heat pump system. When the solar panel does not generate electricity, the compressor of the heat pump system is running, and the power storage unit is insufficient, the power grid is used to supply power to the compressor of the heat pump system. When the solar panel generates electricity under sunlight, the compressor of the heat pump system is not running, and the energy storage unit is fully charged, the direct current generated by the solar panel is converted into alternating current by an inverter and then supplied to the power grid.

12. The photovoltaic and air source heat pump coupled heat recovery method for utilizing waste heat from flue gas in a dust removal system according to claim 9, characterized in that, The photovoltaic and air source heat pump coupled heat recovery method for utilizing waste heat from flue gas in a dust removal system includes: When the compressor of the heat pump system is not running, the preheated heat exchange fluid is directly supplied to the heating terminal equipment.

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