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

Abstract

The invention discloses a photovoltaic and air source heat pump coupled heat recovery system and method utilizing flue gas waste heat of a dust removal system, and relates to the field of energy recovery of dust removal systems, and the photovoltaic and air source heat pump coupled heat recovery system utilizing the flue gas waste heat of the dust removal system comprises a first heat exchanger and a second heat exchanger, comprising a first heat exchange flow channel and a second heat exchange flow channel which can exchange heat, 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 conduct heat exchange, and the compressor, the evaporator, the throttling unit and the third heat exchange flow channel are sequentially connected to form a first circulation flow channel. An outlet of the second heat exchange runner can be communicated with the fourth heat exchange runner; and the solar power generation system is used for supplying power to the compressor. The problems that an existing dust removal system is incomplete in flue gas waste heat recovery and low in recovery rate can be solved.

Description

Technical Field

[0001] The present invention relates to the field of energy recovery of dust removal systems, and in particular to a photovoltaic and air source heat pump coupled heat recovery system and method utilizing flue gas waste heat of dust removal systems. Background Art

[0002] As a clean energy application method that is being vigorously promoted, air source heat pumps have no carbon emissions, can effectively reduce air pollution and haze, and can generate 2-3 times the heat per kilowatt-hour. It is a high-efficiency and energy-saving high-quality solution to replace coal-fired and gas-fired boilers to achieve clean heating. In recent years, in order to promote energy conservation and emission reduction, air source heat pumps can be used for heating in many areas to replace traditional small coal-fired boilers.

[0003] In recent years, with the enhancement of social environmental awareness, new energy photovoltaic power generation has been widely used as an environmentally friendly and low-cost power generation technology. Photovoltaic power generation uses the photovoltaic effect to absorb incident sunlight and generate electron-hole pairs. Under the action of the built-in electric field of the semiconductor pn junction, electrons and holes move to the positive and negative electrodes respectively to form a current. It consists of component arrays, inverters, controllers, etc. According to the type of battery components used, it can be divided into crystalline silicon cells, thin-film cells, concentrator cells, etc. The main feature of photovoltaic power generation is that it can be used as a distributed power source and installed near the load without long-distance transmission. It can generate electricity locally and use it locally. At the same time, it can be installed in a modular manner, with 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, which can not only enjoy the peak electricity price but also cut the peak of the power grid.

[0004] In addition, 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 efficiency. Especially in the steel industry, a large-scale dust removal system is set up to meet environmental protection needs. A large amount of waste heat generated by process production is discharged into the atmosphere through the dust removal system along with dust-containing flue gas. The utilization of this part of waste heat is of great significance. Summary of the invention

[0005] At present, hot water is used to recover the waste heat of flue gas at the entrance of the electrostatic precipitator, and the obtained hot water is used to heat the ash hopper of the electrostatic precipitator to improve the fluidity of the dust in the ash hopper. The applicant found that when the waste heat of flue gas is recovered before the dust collector, the dust-containing flue gas will affect the heat exchange of the heat recovery equipment, thereby shortening the life of the heat recovery equipment; and the waste heat is recovered by using a traditional heat exchanger and directly using the heat, 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 installed inside the bag filter to perform a heat exchange on the flue gas, and the flue gas at the outlet of the dust collector is then subjected to a secondary heat exchange with the hot water after the primary heat exchange, and the flue gas waste heat is recovered through two-stage heat exchange. The applicant found that this method requires a plate heat exchanger to be installed inside the dust collector, which will increase the resistance of the dust collector, and the increase in system power consumption may exceed the recovered low-temperature waste heat; moreover, the plate heat exchanger is placed inside the dust collector, and the dust-containing flue gas affects the heat exchange of the heat recovery equipment, which will shorten the life of the heat recovery equipment; furthermore, the dust collector outlet flue gas is then passed through the heat exchange water tank, which is only suitable for small dust collectors. For large dust collectors used in metallurgy, power plants and other industries, the dust collector outlet pipe is relatively thick, and this solution is not applicable.

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

[0008] The specific technical solution of the embodiment of the present invention is:

[0009] A photovoltaic and air source heat pump coupled heat recovery system utilizing waste heat from flue gas in a dust removal system, the photovoltaic and air source heat pump coupled heat recovery system utilizing waste heat from flue gas in a dust removal system comprising:

[0010] A first heat exchanger, the first heat exchanger comprising a first heat exchange channel and a second heat exchange channel capable of performing heat exchange, the first heat exchange channel being used to receive the flue gas outputted by the dust collector;

[0011] A heat pump system, the heat pump system comprising 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 being sequentially connected to form a first circulation channel, and the outlet of the second heat exchange channel being capable of communicating with the fourth heat exchange channel;

[0012] A solar power generation system is used to supply power to the compressor.

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

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

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

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

[0017] An input port is communicated 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 equipment.

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

[0020] A driving pump is used to drive the fluid in the heat storage tank to flow toward the fourth heat exchange flow channel.

[0021] Preferably, the outlet of the heat storage tank is connected to the fourth heat exchange flow channel through a first pipeline; a first opening and closing valve is provided on the first pipeline;

[0022] The outlet of the heat storage tank is connected to the output port through a second pipeline; a second opening and closing valve is arranged on the second pipeline.

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

[0024] Solar panels;

[0025] An inverter, wherein a DC end of the inverter is electrically connected to the solar cell panel, and an AC end of the inverter is electrically connected to the compressor.

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

[0027] The power storage unit has an input end electrically connected to the solar cell panel, and an output end electrically connected to the DC end of the inverter.

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

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

[0030] An electrical output end, the electrical output end is electrically connected to the AC end of the inverter, and the electrical output end is used to supply power to a power grid.

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

[0032] In a first operating state, the first on-off valve is in an open state, the second on-off valve is in a closed state, the driving 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 driving 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, and the fifth heat exchange channel and the sixth heat exchange channel can perform heat exchange, the compressor, the fifth heat exchange channel, the throttling unit and the third heat exchange channel are connected in sequence to form a first circulation channel, and the sixth heat exchange channel can be connected to the outlet of the first heat exchange channel.

[0035] A dust removal system, comprising:

[0036] Bag dust collector, the bag dust collector is a bag dust collector in at least one of the following dust removal systems in the steel production process: iron-making yard dust removal system, electric furnace primary dust removal system, converter secondary dust removal system, refining dust removal system, desulfurization dust removal system, tank dump dust removal system;

[0037] In the photovoltaic and air source heat pump coupled heat recovery system utilizing waste heat from flue gas of the dust removal system as described above, the inlet of the first heat exchange flow channel is connected to the outlet of the bag filter;

[0038] The fan and the exhaust chimney are connected in sequence, and the inlet of the fan is connected to the outlet of the first heat exchange flow channel.

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

[0040] The direct current generated by the solar panel is converted into alternating current through an inverter to power the compressor of the heat pump system;

[0041] The flue gas outputted from the dust collector is preliminarily heated by the heat exchange fluid flowing through the first heat exchanger;

[0042] Secondarily heating the heat exchange fluid after the initial heating by the condenser of the heat pump system;

[0043] The heat exchange fluid after secondary heating is supplied to the heating terminal equipment.

[0044] Preferably, the temperature of the flue gas output from 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.

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

[0046] When the compressor of the heat pump system is running and the solar panel is illuminated to generate electricity, the direct current generated by the solar panel is converted into alternating current through an inverter to supply power to the compressor of the heat pump system;

[0047] When the solar panel is illuminated to generate electricity and the compressor of the heat pump system is not running, the direct current generated by the solar panel is stored in a 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 through an inverter and then supplied to the compressor of the heat pump system;

[0049] 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;

[0050] When the solar panel is illuminated to generate electricity, 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 through an inverter and then supplied to the power grid.

[0051] Preferably, the photovoltaic and air source heat pump coupled heat recovery method utilizing the waste heat of flue gas from the 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 equipment.

[0053] The technical solution of the present invention has the following significant 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, and the heat exchange fluid output by the second heat exchange channel of the first heat exchanger and preliminarily heated is then transported to the fourth heat exchange channel of the condenser of the heat pump system for secondary heating, thereby obtaining a heat exchange fluid with a higher temperature, and the heat exchange with a higher temperature can be used to supply the heating terminal equipment. The operation of the compressor of the heat pump system is powered by a solar power generation system, thereby reducing or avoiding the introduction of power supply from the power grid. Since the heat exchange fluid output by the second heat exchange channel of the first heat exchanger only needs to be preliminarily heated, the output temperature does not need to be very high, so 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 of the first heat exchanger 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. The above process can solve the problem of incomplete recovery of flue gas waste heat in the existing dust removal system, maximize the utilization of flue gas waste heat, and further reheat the heat exchange fluid output from the second heat exchange channel of the first heat exchanger through the heat pump with higher heating efficiency in the system, so that the heat exchange fluid has practical utilization value.

[0055] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] 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.

[0057] Figure 1 It is a schematic diagram of a system that uses a photovoltaic and air source heat pump coupled heat recovery system and a bag filter to utilize waste heat from flue gas in a dust removal system according to an embodiment of the present invention;

[0058] Figure 2 This is a schematic structural diagram of a photovoltaic and air source heat pump coupled heat recovery system utilizing flue gas waste heat from a dust removal system in a first embodiment of the present invention;

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

[0060] Reference numerals in the above drawings:

[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. Power storage unit; 4. Thermal storage box; 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 using waste heat from flue gas of dust removal system; 300. Fan; 400. Exhaust chimney. DETAILED DESCRIPTION

[0062] The details of the present invention can be more clearly understood by combining the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on another element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the communication between the two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0064] In order to solve the problem of incomplete recovery of flue gas waste heat and low recovery rate in the existing dust removal system, a photovoltaic and air source heat pump coupled heat recovery system 200 utilizing the flue gas waste heat of the dust removal system is proposed in this application. Figure 1 This is a schematic diagram of a system that uses a photovoltaic and air source heat pump coupled heat recovery system and a bag filter to utilize the waste heat of flue gas from a dust removal system in an embodiment of the present invention. Figure 2 FIG. 1 is a schematic diagram of the structure of a photovoltaic and air source heat pump coupled heat recovery system utilizing flue gas waste heat from a dust removal system in a first embodiment of the present invention. Figure 1 and Figure 2 As shown, a photovoltaic and air source heat pump coupled heat recovery system 200 utilizing waste heat from flue gas of a dust removal system may include: a first heat exchanger 1, the first heat exchanger 1 including a first heat exchange channel 11 and a second heat exchange channel 12 capable of heat exchange, the first heat exchange channel 11 being used to receive flue gas outputted from the dust collector; a heat pump system 2, the heat pump system 2 including: 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 being capable of heat exchange, the compressor 21, the evaporator 22, the throttling unit 23 and the third heat exchange channel 241 being sequentially connected to form a first circulation channel, the outlet of the second heat exchange channel 12 being able to communicate with the fourth heat exchange channel 242; a solar power generation system 3, the solar power generation system 3 being used to power 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 heat exchange fluid output by the second heat exchange channel 12 of the first heat exchanger 1 and preliminarily heated is then transported to the fourth heat exchange channel 242 of the condenser 24 of the heat pump system 2 for secondary heating, thereby obtaining a heat exchange fluid with a higher temperature. The heat exchange with a 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, thereby reducing or avoiding the introduction of 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, so 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 the room temperature, so that the waste heat recovery of the flue gas is more complete. The above process can solve the problem of incomplete recovery of flue gas waste heat in the existing dust removal system, maximize the utilization of flue gas waste heat, and further reheat the heat exchange fluid output by the second heat exchange channel 12 of the first heat exchanger 1 through the heat pump with higher heating efficiency in the system, so that the heat exchange fluid has practical utilization value.

[0066] like Figure 2 As shown, the first heat exchanger 1 includes a first heat exchange channel 11 and a 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 dust collector outlet. By selecting the flue gas discharged from the dust collector outlet, the equipment investment can be reduced and the service life of the equipment can be increased.

[0067] The photovoltaic and air source heat pump coupled heat recovery system 200 using the waste heat of the flue gas of the dust removal system in this application can be applied to the flue gas output by ordinary bag dust collectors, filter cartridge dust collectors, high-temperature bag dust collectors and electrostatic precipitator lamps. Among them, the temperature resistance of ordinary bag dust collectors or filter cartridge dust collectors can reach 130°C. After treating the higher temperature flue gas, the flue gas temperature at the dust collector outlet is about 80°C to 120°C; the temperature resistance of high-temperature bag dust collectors can reach 280°C. After treating the high temperature flue gas, the flue gas temperature at the dust collector outlet is about 180°C to 220°C. When the flue gas temperature at the electrostatic precipitator outlet is greater than 80°C, it also has a higher recovery efficiency. Preferably, since the outlet flue gas temperature of some dust collectors is relatively low and the degree of waste heat recovery in 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 target ordinary bag dust collectors and cartridge dust collectors to improve the degree of waste heat recovery of the flue gas.

[0068] Taking the ordinary bag dust removal system as an example, when treating relatively high temperature flue gas (such as secondary flue gas from converters, flue gas from refining dust removal, flue gas from desulfurization and dephosphorization, flue gas from tank dumping, etc.), the dusty high temperature flue gas enters the ordinary bag dust collector through the dust removal hood, regulating valve, and pipeline for purification. The temperature of the purified flue gas is about 80℃ to 120℃. A photovoltaic and air source heat pump coupled heat recovery system 200 that utilizes the waste heat of the flue gas from the dust removal system can be added at the outlet of the ordinary bag dust collector, such as Figure 1 As shown, the waste heat of the flue gas is recovered and then discharged into the atmosphere through the fan 300, the muffler, and the exhaust chimney 400.

[0069] The inlet of the second heat exchange channel 12 of the first heat exchanger 1 is used to input the 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 from the second heat exchange channel 12 of the first heat exchanger 1 only needs 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 passed, thereby greatly improving the cooling effect of the flue gas, making the flue gas cooling range 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.

[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 such a temperature does not have much practical value. For example, conventional heating terminal equipment 10 cannot use such a heat exchange fluid at a relatively low temperature. Therefore, the heat exchange fluid needs to be reheated to improve its practical value. Therefore, the heat exchange fluid output from the second heat exchange channel 12 can be reheated by the heat pump system 2.

[0071] The heat pump system 2 may 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. Among them, the third heat exchange channel 241 and the fourth heat exchange channel 242 can perform heat exchange. The compressor 21, the evaporator 22, the throttling unit 23 and the third heat exchange channel 241 are connected in sequence to form a first circulation channel. The outlet of the second heat exchange channel 12 can be connected to the fourth heat exchange channel 242. The heat exchange fluid output from the second heat exchange channel 12 flows into the fourth heat exchange channel 242 for secondary heating, and 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 utilization value, and the part of the heat exchange fluid can be supplied to the heating terminal device 10 for use. Further, a liquid storage tank 25 can also 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 may also be provided on the first circulation flow channel, and the gas-liquid separator 26 may 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 the heat exchange with the external gas at the evaporator 22. In order to reduce the electric energy input from the power grid of the photovoltaic and air source heat pump coupled heat recovery system 200 that utilizes the waste heat of the flue gas of the dust removal system, so as to reduce the operating cost, a solar power generation system 3 is used to power the compressor 21. The solar power generation system 3 may include: a solar panel 31; an inverter 32, the DC end of the inverter 32 is electrically connected to the solar panel 31, and the AC end of the inverter 32 is electrically connected to the compressor 21. The DC power generated by the solar panel 31 is converted into AC power by the inverter 32 and then supplied to the compressor 21.

[0073] As a feasible method, the solar power generation system 3 may include: a power storage unit 33, whose input end is electrically connected to the solar panel 31, and whose output end is electrically connected to the DC end of the inverter 32. When the solar panel 31 generates more electricity, or when the compressor 21 is not running, the excess electric energy can be input into the power storage unit 33 for storage and standby. When the solar panel 31 generates insufficient electricity, the power storage unit 33 can be used together to supply power to the compressor 21.

[0074] The photovoltaic and air source heat pump coupled heat recovery system 200 utilizing the waste heat of flue gas from the dust removal system may include: a power input terminal 61, which is used to be electrically connected to the power grid A, and the power input terminal 61 is electrically connected to the compressor 21; an electrical output terminal 62, and the electrical output terminal 62 is electrically connected to the AC terminal of the inverter 32, and the electrical output terminal 62 is used to supply power to the power grid. When the solar panel 31 generates more electricity, or when the compressor 21 is not running, the excess electric energy can be converted into AC power by the inverter 32 and then supplied to the power grid. When the solar panel 31 does not generate electricity and the power storage unit 33 is 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 waste heat of flue gas from the dust removal system also includes: a heat storage tank 4, which is connected between the outlet of the second heat exchange channel 12 and the inlet of the fourth heat exchange channel 242. The heat storage tank 4 can accommodate a large amount of heat exchange fluid, so as to achieve the purpose of heat storage, and also ensure that the temperature of the heat exchange fluid input to the fourth heat exchange channel 242 is more stable.

[0076] The photovoltaic and air source heat pump coupled heat recovery system 200 using the waste heat of the flue gas of the dust removal system may include: an output port 51, the output port 51 is connected to the outlet of the fourth heat exchange channel 242; the input port 52 is connected to the inlet of the second heat exchange 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 the waste heat of the flue gas of the dust removal system, and the heat exchange fluid is output from the output port 51 after preliminary heating and secondary heating, so as to be supplied to the heating terminal device 10 for use. The heating terminal device 10 may include at least one of the following: an air curtain, a wall-mounted air conditioner, a fan 300 coil, a radiator, a 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 increase 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 passes through the heating terminal device 10, supplies at least part of the heat to the heating terminal device 10, and can also flow back to the input port 52. In order to drive the heat exchange fluid to circulate between the heating terminal device 10, the second heat exchange channel 12, the fourth heat exchange channel 242, and the heat storage tank 4, the photovoltaic and air source heat pump coupled heat recovery system 200 using the waste heat of the dust removal system flue gas can include: a drive pump 8, which is used to drive the fluid in the heat storage tank 4 to flow in the direction of the fourth heat exchange channel 242.

[0078] As feasible, the outlet of the heat storage tank 4 is connected to the fourth heat exchange flow channel 242 through the first pipeline; a first opening and closing valve 91 is provided on the first pipeline. The outlet of the heat storage tank 4 is connected to the output port 51 through the second pipeline; a second opening and closing valve 92 is provided on the second pipeline. Correspondingly, the photovoltaic and air source heat pump coupled heat recovery system 200 using the flue gas waste heat of the dust removal system can have two operating states: in the first operating state, the first opening and closing valve 91 is in an open state, the second opening and closing valve 92 is in a closed state, the drive pump 8 is in an operating state, and the compressor 21 is in an operating state; in the second operating state, the first opening and closing valve 91 is in a closed state, the second opening and closing valve 92 is in an open state, the drive pump 8 is in an operating state, and the compressor 21 is in a 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 the waste heat of the dust removal system flue gas can be switched to the first operating state, so as to perform secondary heating using 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 the waste heat of the dust removal system flue gas 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 can be directly output from the output port 51 to the heating terminal device 10.

[0080] Furthermore, Figure 3 FIG. 1 is a schematic diagram of the structure of a photovoltaic and air source heat pump coupled heat recovery system utilizing flue gas waste heat from a dust removal system in a second embodiment of the present invention. Figure 3 As shown, the evaporator 22 may have a fifth heat exchange channel 221 and a sixth heat exchange channel 222. Among them, the fifth heat exchange channel 221 and the sixth heat exchange channel 222 can perform heat exchange, and the compressor 21, the fifth heat exchange channel 221, the throttling unit 23 and the third heat exchange channel 241 are sequentially connected to form a first circulation channel. The sixth heat exchange channel 222 can be connected to the outlet of the first heat exchange channel 11. Since 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 in the first heat exchange channel 11, the part of the flue gas can be used to heat the evaporator 22 of the heat pump system 2, so the flue gas discharged after heat exchange in the first heat exchange channel 11 is then introduced into the sixth heat exchange channel 222 of the evaporator 22, thereby heating the refrigerant flowing through the fifth heat exchange channel 221 of the evaporator 22. Since the temperature of the gas exchanged between the evaporator 22 and the outside 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 thermal energy can be greatly improved.

[0081] In other feasible implementations, the flue gas output from the dust collector may be directly input into the sixth heat exchange channel 222 of the evaporator 22 . This approach can further significantly improve the COP of the heat pump system 2 .

[0082] like Figure 1As shown, the present application also proposes a dust removal system, which may include: a bag dust collector 100, the bag dust collector 100 is a bag dust collector 100 of at least one of the following dust removal systems in the steel production process: an iron-making yard 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 inversion dust removal system; such as any of the above-mentioned photovoltaic and air source heat pump coupled heat recovery systems 200 that utilize the waste heat of flue gas from the dust removal system, the inlet of the first heat exchange channel 11 is connected to the outlet of the bag dust collector 100; the fan 300 and the exhaust chimney 400 are connected in sequence, and the inlet of the fan 300 is connected to the outlet of the first heat exchange channel 11.

[0083] The present application also proposes a photovoltaic and air source heat pump coupled heat recovery method using the waste heat of flue gas in a dust removal system. The photovoltaic and air source heat pump coupled heat recovery method using the waste heat of flue gas in a dust removal system may include:

[0084] The direct current generated by the solar panel 31 is converted into alternating current through the inverter 32 and then supplied 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 illuminated to generate electricity, the direct current generated by the solar panel 31 is converted into alternating current through the inverter 32 and then supplied to the compressor 21 of the heat pump system 2; when the solar panel 31 is illuminated to generate electricity and the compressor 21 of the heat pump system 2 is not running, the direct current generated by the solar panel 31 is stored through 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 power storage unit 33 is stored. The output direct current is converted into alternating current by the inverter 32 and then supplied to the compressor 21 of the heat pump system 2; when the solar panel 31 does not generate 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 generates electricity under the illumination of light, the compressor 21 of the heat pump system 2 is not running, and the power storage unit 33 is fully charged, the direct current generated by the solar panel 31 is converted into alternating current by the inverter 32 and then supplied to the power grid.

[0086] The flue gas output from the dust collector is passed through the first heat exchanger 1 to preliminarily heat the heat exchange fluid flowing through it.

[0087] In this step, the flue gas output from the dust collector is passed into the first heat exchange channel 11 of the first heat exchanger 1, so as to preliminarily heat the heat exchange fluid flowing through the second heat exchange channel 12 of the first heat exchanger 1.

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

[0089] The heat exchange fluid that has been preliminarily heated is then reheated by the condenser 24 of the heat pump system 2 .

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

[0091] In this step, after the heat exchange fluid passes through the heating terminal device 10 to provide heat, it can flow back to the second heat exchange channel 12 of the first heat exchanger 1 .

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

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

[0094] The present application can recover the waste heat of the flue gas discharged from 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 flue gas cooling range is 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 degrees Celsius, close to room temperature, so that the waste heat recovery of the flue gas is more complete; afterwards, the heat pump with higher heating efficiency in the system can further reheat 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 practical utilization value. The above method can maximize the utilization of flue gas waste heat, and convert the low-temperature thermal energy of the heat exchange fluid into higher-quality high-temperature thermal energy to meet heating and process requirements.

[0095] The system can utilize renewable energy solar power to supply heat pumps, and in conjunction with a high-efficiency heating device heat pump system 2, it can achieve low-carbon or zero-carbon emissions, helping to reduce greenhouse gas emissions.

[0096] In addition, since the photovoltaic and air source heat pump coupled heat recovery system and method that utilizes the waste heat of the dust removal system flue gas can be operated in conjunction with the power storage unit 33 and the power grid, a suitable source of electricity can be selected for different situations, and when the solar panel 31 generates too much electricity, energy can be stored or the electricity can be incorporated into the public power grid. Overall, the stability of the system can be greatly improved and the utilization rate of electricity can be improved.

[0097] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of ... " describing a combination should include determined elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps here also contemplates the implementation method consisting essentially of these elements, ingredients, parts or steps. Here, by using the term "may", it is intended to illustrate that any attribute described that "may" includes is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "one" used to describe an element, ingredient, part or step is not said to exclude other elements, ingredients, parts or steps.

[0098] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. The purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A photovoltaic and air source heat pump coupled heat recovery system utilizing the waste heat of flue gas from a dust removal system, characterized in that: The photovoltaic and air source heat pump coupled heat recovery system utilizing the waste heat of flue gas from the dust removal system comprises: A first heat exchanger, the first heat exchanger comprising a first heat exchange channel and a second heat exchange channel capable of performing heat exchange, the first heat exchange channel being used to receive the flue gas outputted by the dust collector; A heat pump system, the heat pump system comprising 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 being sequentially connected to form a first circulation channel, and the outlet of the second heat exchange channel being capable of communicating with the fourth heat exchange channel; A solar power generation system is used to supply power to the compressor.

2. The photovoltaic and air source heat pump coupled heat recovery system utilizing flue gas waste heat from a dust removal system according to claim 1 is characterized in that: The photovoltaic and air source heat pump coupled heat recovery system utilizing the waste heat of flue gas from the dust removal system also includes: A heat storage box is connected between the outlet of the second heat exchange channel and the inlet of the fourth heat exchange channel.

3. The photovoltaic and air source heat pump coupled heat recovery system utilizing the flue gas waste heat of the dust removal system according to claim 2 is characterized in that: The photovoltaic and air source heat pump coupled heat recovery system using the waste heat of the dust removal system flue gas includes: an output port, the output port being in communication with an outlet of the fourth heat exchange channel; An input port is communicated with an inlet of the second heat exchange channel.

4. The photovoltaic and air source heat pump coupled heat recovery system utilizing flue gas waste heat from a dust removal system according to claim 3 is characterized in that: The output port and the input port are respectively used to communicate with the inlet and the outlet of the heating terminal equipment.

5. The photovoltaic and air source heat pump coupled heat recovery system utilizing flue gas waste heat from a dust removal system according to claim 4 is characterized in that: The photovoltaic and air source heat pump coupled heat recovery system using the waste heat of the dust removal system flue gas includes: A driving pump is used to drive the fluid in the heat storage tank to flow toward the fourth heat exchange flow channel.

6. The photovoltaic and air source heat pump coupled heat recovery system utilizing flue gas waste heat from a dust removal system according to claim 5 is characterized in that: The outlet of the heat storage tank is connected to the fourth heat exchange flow channel through a first pipeline; a first opening and closing 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 opening and closing valve is arranged on the second pipeline.

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

8. The photovoltaic and air source heat pump coupled heat recovery system utilizing flue gas waste heat from a dust removal system according to claim 7 is characterized in that: The solar power generation system comprises: The power storage unit has an input end electrically connected to the solar cell panel, and an output end electrically connected to the DC end of the inverter.

9. The photovoltaic and air source heat pump coupled heat recovery system utilizing flue gas waste heat from a dust removal system according to claim 7 is characterized in that: The photovoltaic and air source heat pump coupled heat recovery system utilizing the waste heat of flue gas from the dust removal system comprises: A power input terminal, which is used to be electrically connected to a power grid, and the power input terminal is electrically connected to the compressor; An electrical output end, the electrical output end is electrically connected to the AC end of the inverter, and the electrical output end is used to supply power to a power grid.

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

11. The photovoltaic and air source heat pump coupled heat recovery system utilizing flue gas waste heat from a dust removal system according to claim 1 is characterized in that: The evaporator has a fifth heat exchange channel and a sixth heat exchange channel, and the fifth heat exchange channel and the sixth heat exchange channel can perform heat exchange. The compressor, the fifth heat exchange channel, the throttling unit and the third heat exchange channel are connected in sequence to form a first circulation channel, and the sixth heat exchange channel can be connected to the outlet of the first heat exchange channel.

12. A dust removal system, characterized in that: The dust removal system comprises: Bag dust collector, the bag dust collector is a bag dust collector in at least one of the following dust removal systems in the steel production process: iron-making yard dust removal system, electric furnace primary dust removal system, converter secondary dust removal system, refining dust removal system, desulfurization dust removal system, tank dump dust removal system; The photovoltaic and air source heat pump coupled heat recovery system utilizing flue gas waste heat from a dust removal system as claimed in any one of claims 1 to 11, wherein the inlet of the first heat exchange flow channel is connected to the outlet of the bag filter; A fan and an exhaust chimney are connected in sequence, and an inlet of the fan is connected to an outlet of the first heat exchange channel.

13. A photovoltaic and air source heat pump coupled heat recovery method using flue gas waste heat from a dust removal system, characterized in that: The photovoltaic and air source heat pump coupled heat recovery method utilizing the waste heat of flue gas from the dust removal system comprises: The direct current generated by the solar panel is converted into alternating current through an inverter to power the compressor of the heat pump system; The flue gas outputted from the dust collector is preliminarily heated by the heat exchange fluid flowing through the first heat exchanger; Secondarily heating the heat exchange fluid after the initial heating by the condenser of the heat pump system; The heat exchange fluid after secondary heating is supplied to the heating terminal equipment.

14. The photovoltaic and air source heat pump coupled heat recovery method using flue gas waste heat from a dust removal system according to claim 13 is 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 by the first heat exchanger is less than or equal to 30 degrees Celsius.

15. The photovoltaic and air source heat pump coupled heat recovery method using flue gas waste heat from a dust removal system according to claim 13, characterized in that: The direct current generated by the solar panels is converted into alternating current through 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 is illuminated to generate electricity, the direct current generated by the solar panel is converted into alternating current through an inverter to supply power to the compressor of the heat pump system; When the solar panel is illuminated to generate electricity and the compressor of the heat pump system is not running, the direct current generated by the solar panel is stored in a power storage unit; 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 through an inverter and then supplied to 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 is illuminated to generate electricity, 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 through an inverter and then supplied to the power grid.

16. The photovoltaic and air source heat pump coupled heat recovery method using flue gas waste heat from a dust removal system according to claim 13, characterized in that: The photovoltaic and air source heat pump coupled heat recovery method utilizing the waste heat of flue gas from the dust removal system comprises: 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 equipment.

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