Dust removal flue gas waste heat recovery system and method based on air source heat pump and dust removal system

Abstract

The invention discloses a dust removal flue gas waste heat recovery system and method based on an air source heat pump and a dust removal system, and relates to the field of dust removal system energy recovery. Comprising a compressor, an evaporator with a first heat exchange flow channel and a second heat exchange flow channel, a throttling unit and a condenser with a third heat exchange flow channel and a fourth heat exchange flow channel, the compressor, the first heat exchange flow channel, the throttling unit and the third heat exchange flow channel are sequentially connected to form a first circulating flow channel, and the second heat exchange flow channel is used for receiving flue gas output by a dust remover; 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, and the COP of the air source heat pump system is reduced due to the low environment temperature of an evaporator of the air source heat pump system 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 dust removal flue gas waste heat recovery system and method based on an air source heat pump, and a dust removal system. 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, with the frequent occurrence of haze weather, in order to reduce haze disasters and promote energy conservation and emission reduction, air source heat pumps can be used for heating instead of traditional small coal-fired boilers in many areas.

[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 the dust-containing flue gas. The utilization of this part of waste heat is of great significance. For example, in the steel industry, the flue gas temperature of the iron-making yard dust removal system, electric furnace dust removal system, converter secondary dust removal system, refining dust removal system, desulfurization dust removal system, and tank dust removal system is relatively high, and has good recovery value. Considering that the flue gas before the dust collector inlet contains a large amount of dust, the requirements for the recovery equipment are high. Although some heat will be lost in recovering the flue gas waste heat from the dust collector outlet, it is more cost-effective considering factors such as equipment investment and service life. 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 solar air collector and air source heat pump combined heating system, which uses the solar air collector and air source heat pump together to improve the system efficiency. The applicant found that the hot air obtained by the solar air collector in this way has poor stability and is greatly affected by the environment; moreover, this method does not reduce the power input of the system, but the power introduced into the system by the solar air collector increases.

[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 dust removal flue gas waste heat recovery system and method, and a dust removal system based on an air source heat pump, which can solve the problems of incomplete recovery of flue gas waste heat and low recovery rate in the existing dust removal system and the problem of reduced COP of the air source heat pump system caused by the low ambient temperature of the evaporator of the air source heat pump system.

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

[0009] A dust removal fume waste heat recovery system based on an air source heat pump, the dust removal fume waste heat recovery system based on an air source heat pump comprising:

[0010] A heat pump system, the heat pump system comprising a compressor, an evaporator having a first heat exchange channel and a second heat exchange channel, a throttling unit, and a condenser having a third heat exchange channel and a fourth heat exchange channel, the first heat exchange channel and the second heat exchange channel being capable of heat exchange, the third heat exchange channel and the fourth heat exchange channel being capable of heat exchange, the compressor, the first heat exchange channel, the throttling unit, and the third heat exchange channel being sequentially connected to form a first circulation channel, and the second heat exchange channel being used to receive flue gas outputted by a dust collector;

[0011] A solar power generation system is used to supply power to the compressor.

[0012] Preferably, the dust removal flue gas waste heat recovery system based on air source heat pump comprises:

[0013] an output port, the output port being in communication with an outlet of the fourth heat exchange channel;

[0014] An input port is communicated with an inlet of the fourth heat exchange channel.

[0015] Preferably, the output port and the input port are respectively used to communicate with the inlet and the outlet of the heating terminal equipment.

[0016] Preferably, the dust removal flue gas waste heat recovery system based on air source heat pump comprises:

[0017] A driving pump is disposed on a flow channel from the input port through the fourth heat exchange flow channel to the output port to drive the fluid to flow from the input port to the fourth heat exchange flow channel.

[0018] Preferably, the dust removal flue gas waste heat recovery system based on air source heat pump comprises:

[0019] The first heat exchanger comprises a fifth heat exchange channel and a sixth heat exchange channel capable of performing heat exchange, wherein the fifth heat exchange channel is used to receive the flue gas outputted by the dust collector; and the outlet of the sixth heat exchange channel can be connected to the fourth heat exchange channel.

[0020] Preferably, the dust removal flue gas waste heat recovery system based on air source heat pump comprises:

[0021] an output port, the output port being in communication with an outlet of the fourth heat exchange channel;

[0022] an input port, the input port being in communication with an inlet of the sixth heat exchange flow channel;

[0023] A driving pump is used to drive the fluid to flow from the input port toward the sixth heat exchange channel.

[0024] Preferably, the dust removal flue gas waste heat recovery system based on air source heat pump also includes:

[0025] A heat storage box is connected between the outlet of the sixth heat exchange channel and the inlet of the fourth heat exchange channel.

[0026] 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;

[0027] 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.

[0028] Preferably, the dust removal flue gas waste heat recovery system based on air source heat pump has two operating states:

[0029] 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;

[0030] 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.

[0031] Preferably, the inlet of the second heat exchange channel is connected to the outlet of the fifth heat exchange channel.

[0032] Preferably, the second heat exchange channel and the fifth heat exchange channel are arranged in parallel.

[0033] Preferably, the solar power generation system comprises:

[0034] Solar panels;

[0035] 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.

[0036] Preferably, the solar power generation system comprises:

[0037] 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.

[0038] Preferably, the dust removal flue gas waste heat recovery system based on air source heat pump comprises:

[0039] 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;

[0040] 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.

[0041] A dust removal system, comprising:

[0042] 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;

[0043] In the dust removal flue gas waste heat recovery system based on an air source heat pump as described above, the inlet of the second heat exchange flow channel is connected to the outlet of the bag filter;

[0044] The fan and the exhaust chimney are connected in sequence, and the inlet of the fan is connected to the outlet of the second heat exchange flow channel.

[0045] A dust removal flue gas waste heat recovery method based on an air source heat pump, the dust removal flue gas waste heat recovery method based on an air source heat pump comprising:

[0046] 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;

[0047] The flue gas outputted from the dust collector is passed through the second heat exchange flow channel of the evaporator of the heat pump system to heat the refrigerant flowing through the first heat exchange flow channel of the evaporator;

[0048] The input heat exchange fluid is heated through the fourth heat exchange channel of the condenser of the heat pump system, and the compressor, the first heat exchange channel, the throttling unit and the third heat exchange channel of the condenser of the heat pump system are sequentially connected to form a first circulation channel for the flow of refrigerant;

[0049] The heated heat exchange fluid is supplied to the heating terminal equipment.

[0050] 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 evaporator is less than or equal to 30 degrees Celsius.

[0051] 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:

[0052] 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;

[0053] 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;

[0054] 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;

[0055] 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;

[0056] 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.

[0057] Preferably, the dust removal flue gas waste heat recovery method based on an air source heat pump comprises:

[0058] The flue gas outputted from the dust collector is preliminarily heated by passing the heat exchange fluid flowing through the sixth heat exchange flow channel of the first heat exchanger through the fifth heat exchange flow channel of the first heat exchanger;

[0059] The step of heating the input heat exchange fluid through the fourth heat exchange flow channel of the condenser of the heat pump system comprises:

[0060] The heat exchange fluid that has been preliminarily heated and flows out of the sixth heat exchange flow channel is secondarily heated through the fourth heat exchange flow channel of the condenser of the heat pump system.

[0061] Preferably, the dust removal flue gas waste heat recovery method based on an air source heat pump comprises:

[0062] 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.

[0063] Preferably, the step of heating the flue gas outputted from the dust collector through the second heat exchange flow channel of the evaporator of the heat pump system to the refrigerant flowing through the first heat exchange flow channel of the evaporator comprises:

[0064] The flue gas exhausted through the fifth heat exchange channel of the first heat exchanger is passed through the second heat exchange channel of the evaporator of the heat pump system to heat the refrigerant flowing through the first heat exchange channel of the evaporator.

[0065] The technical solution of the present invention has the following significant beneficial effects:

[0066] The present application utilizes the second heat exchange flow channel of the evaporator of the heat pump system to receive the flue gas output by the dust collector, thereby utilizing the waste heat of the flue gas for recovery and heating the refrigerant flowing through the first heat exchange flow channel of the evaporator. The temperature of the flue gas output by the dust collector is relatively higher than that of the outside normal temperature air. This part of the flue gas can be used to efficiently heat the refrigerant in the evaporator of the heat pump system. Since the temperature of the gas exchanged between the evaporator and the outside is further increased, the COP of the heat pump system can be greatly improved, and the conversion efficiency of thermal energy is greatly improved. 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 temperature of the gas exchanged between the evaporator and the outside is greatly increased, the condenser of the heat pump system can heat the heat exchange fluid flowing through the fourth heat exchange flow channel to a higher temperature, making it high-quality thermal energy, thereby making the heat exchange fluid have a higher practical utilization value. Finally, since the temperature of the refrigerant in the evaporator can be very low, the temperature of the flue gas flowing through the second heat exchange flow channel of the evaporator can be reduced to a very low temperature, which can make the waste heat recovery of the flue gas more complete.

[0067] 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

[0068] 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.

[0069] Figure 1 It is a system schematic diagram of the coordination between the dust removal flue gas waste heat recovery system based on the air source heat pump and the bag filter in the embodiment of the present invention;

[0070] Figure 2 It is a structural schematic diagram of a dust removal flue gas waste heat recovery system based on an air source heat pump in a first embodiment of the present invention;

[0071] Figure 3 It is a structural schematic diagram of a dust removal flue gas waste heat recovery system based on an air source heat pump in a second implementation manner in an embodiment of the present invention;

[0072] Figure 4 It is a structural schematic diagram of the dust removal flue gas waste heat recovery system based on the air source heat pump in the third implementation mode in an embodiment of the present invention.

[0073] Reference numerals of the above drawings:

[0074] 1. First heat exchanger; 11. Fifth heat exchange channel; 12. Sixth heat exchange channel; 2. Heat pump system; 21. Compressor; 22. Evaporator; 221. First heat exchange channel; 222. Second 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; 32. Inverter; 33. Power storage unit; 4. Heat storage box; 51. Output port; 52. Input port; 61. Power input terminal; 62. Power output terminal; 8. Drive pump; 91. First opening and closing valve; 92. Second opening and closing valve; 10. Heating terminal equipment; 100. Bag filter; 200. Dust removal flue gas waste heat recovery system based on air source heat pump; 300. Fan; 400. Exhaust chimney. DETAILED DESCRIPTION

[0075] 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.

[0076] 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.

[0077] In order to solve the problems of incomplete flue gas waste heat recovery and low recovery rate in the existing dust removal system and the problem of reduced COP of the air source heat pump system caused by the low ambient temperature of the evaporator of the air source heat pump system, the present application proposes a dust removal flue gas waste heat recovery system 200 based on an air source heat pump. Figure 1 The system schematic diagram of the dust removal flue gas waste heat recovery system based on the air source heat pump and the bag dust collector in the embodiment of the present invention is shown in FIG. Figure 2 FIG. 1 is a schematic structural diagram of a dust removal flue gas waste heat recovery system based on an air source heat pump in a first embodiment of the present invention. Figure 1 and Figure 2As shown, the dust removal flue gas waste heat recovery system 200 based on air source heat pump may include: a heat pump system 2, the heat pump system 2 includes a compressor 21, an evaporator 22 having a first heat exchange channel 221 and a second heat exchange channel 222, a throttling unit 23 and a condenser 24 having a third heat exchange channel 241 and a fourth heat exchange channel 242, the first heat exchange channel 221 and the second heat exchange channel 222 can perform heat exchange, the third heat exchange channel 241 and the fourth heat exchange channel 242 can perform heat exchange, the compressor 21, the first 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, and the second heat exchange channel 222 is used to receive the flue gas output by the dust collector; a solar power generation system 3, the solar power generation system 3 is used to power the compressor 21.

[0078] The present application utilizes the second heat exchange channel 222 of the evaporator 22 of the heat pump system 2 to receive the flue gas output by the dust collector, thereby utilizing the waste heat of the flue gas for recovery and heating the refrigerant flowing through the first heat exchange channel 221 of the evaporator 22. The flue gas output by the dust collector is relatively higher than the temperature of the outside normal temperature air, and this part of the flue gas can be used to efficiently heat the refrigerant in the evaporator 22 of the heat pump system 2. Since the temperature of the gas exchanged between the evaporator 22 and the outside is further increased, the COP of the heat pump system 2 can be greatly improved, and the conversion efficiency of heat energy is greatly improved. 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 temperature of the gas exchanged between the evaporator 22 and the outside is greatly increased, the condenser 24 of the heat pump system 2 can heat the heat exchange fluid flowing through the fourth heat exchange channel 242 to a higher temperature, making it high-quality heat energy, so that the heat exchange fluid has a higher practical utilization value. Finally, since the temperature of the refrigerant in the evaporator 22 can be very low, the temperature of the flue gas flowing through the second heat exchange channel 222 of the evaporator 22 can be reduced to a very low temperature. For example, the temperature of the flue gas output after heat exchange through the evaporator 22 is less than or equal to 30 degrees Celsius, which can make the waste heat recovery of the flue gas more complete.

[0079] The dust removal flue gas waste heat recovery system 200 based on air source heat pump in the present application can be applied to the flue gas output by ordinary bag dust collector, filter cartridge dust collector, high temperature bag dust collector and electric dust collector lamp. Among them, the temperature resistance of ordinary bag dust collector or filter cartridge dust collector can reach 130℃, and after treating the higher temperature flue gas, the flue gas temperature at the dust collector outlet is about 80℃ to 120℃; the temperature resistance of high temperature bag dust collector can reach 280℃, and after treating the high temperature flue gas, the flue gas temperature at the dust collector outlet is about 180℃ to 220℃, and the electrostatic precipitator outlet flue gas temperature is greater than 80℃, and there is also a higher recovery efficiency. As a preferred embodiment, 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, and the dust removal flue gas waste heat recovery system 200 based on air source heat pump in the present application can effectively target ordinary bag dust collectors and filter cartridge dust collectors to improve the degree of waste heat recovery of flue gas.

[0080] Taking the ordinary bag dust removal system as an example, when treating relatively high temperature flue gas (such as secondary flue gas from converters, refining dust removal flue gas, desulfurization and dephosphorization dust removal flue gas, tank dust removal flue gas, 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 dust removal flue gas waste heat recovery system based on an air source heat pump 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.

[0081] like Figure 2As shown, the heat pump system 2 may include a compressor 21, an evaporator 22 having a first heat exchange channel 221 and a second heat exchange channel 222, 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 are capable of heat exchange. The first heat exchange channel 221 and the second heat exchange channel 222 are capable of heat exchange. The compressor 21, the first heat exchange channel 221 of the evaporator 22, the throttling unit 23 and the third heat exchange channel 241 are sequentially connected to form a first circulation channel, and the refrigerant circulates in the first circulation channel to transfer energy. The second heat exchange channel 222 is used to receive the flue gas output by the dust collector, and the flue gas is used to heat the low-temperature refrigerant flowing through the first heat exchange channel 221. The fourth heat exchange channel 242 is used to pass the heat exchange fluid that needs to be heated, and the third heat exchange channel 241 flows through the high-temperature refrigerant compressed by the compressor 21, thereby heating the heat exchange fluid flowing through the fourth heat exchange channel 242. The temperature of the heat exchange fluid flowing out of the fourth heat exchange channel 242 is increased, so that this part of the heat exchange fluid has a certain practical utilization value, and this part of the heat exchange fluid can be supplied to the heating terminal equipment 10 for use. Furthermore, 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, and the gas-liquid separator 26 can be located between the inlet of the compressor 21 and the evaporator 22.

[0082] Compared with the outside normal temperature air, the temperature of the flue gas output by the dust collector is basically higher than the temperature of the outside normal temperature air. Even for ordinary bag dust collectors and filter cartridge dust collectors, the minimum flue gas temperature at the dust collector outlet must be 80°C, which is much higher than the temperature of the outside normal temperature air. This part of the flue gas is used to efficiently heat the refrigerant in the evaporator 22 of the heat pump system 2. Since the temperature of the gas exchanged between the evaporator 22 and the outside is further increased, the COP of the heat pump system 2 can be greatly improved, and the conversion efficiency of thermal energy is greatly improved. Especially in winter or late autumn, since the outside normal temperature air temperature is low, if the outside normal temperature air temperature is used to heat the refrigerant in the evaporator 22 of the heat pump system 2, the heating effect is very poor, the COP of the entire heat pump system 2 will be very low, and the conversion efficiency of thermal energy is very low. Since the temperature of the gas that exchanges heat between the evaporator 22 and the outside world is greatly increased, the condenser 24 of the heat pump system 2 can heat the heat exchange fluid flowing through the fourth heat exchange channel 242 to a higher temperature, making it high-quality thermal energy, thereby making the heat exchange fluid have a higher practical utilization value. Finally, since the refrigerant in the evaporator 22 has passed through the throttling unit 23, the temperature of the refrigerant can be very low, for example, it can be reduced to a few degrees Celsius or a few degrees below zero, or even dozens of degrees below zero. Depending on the type of refrigerant, the temperature of the refrigerant can also be controlled. Therefore, after heat exchange, the temperature of the flue gas flowing through the second heat exchange channel 222 of the evaporator 22 can be reduced to a very low temperature, which can make the waste heat recovery of the flue gas more complete.

[0083] The energy input of the heat pump system 2 is the power 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 power input from the power grid of the photovoltaic and air source heat pump coupled heat recovery system using the waste heat of the dust removal system flue gas, so as to reduce the operating cost, the solar power generation system 3 is used to power the compressor 21. Figure 2 As shown, the solar power generation system 3 may include: a solar panel 31; an inverter 32, wherein 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.

[0084] As feasible, Figure 2 As shown, 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 power the compressor 21.

[0085] The photovoltaic and air source heat pump coupled heat recovery system 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 electric output terminal 62, and the electric output terminal 62 is electrically connected to the AC terminal of the inverter 32, and the electric 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 electric energy of the storage unit 33 is exhausted, the compressor 21 can be directly powered by the power grid.

[0086] like Figure 2 As shown, the dust removal flue gas waste heat recovery system 200 based on air source heat pump may include: an output port 51, the output port 51 is connected to the outlet of the fourth heat exchange channel 242; and an input port 52, the input port 52 is connected to the inlet of the fourth heat exchange channel 242. The heat exchange fluid can be input into the dust removal flue gas waste heat recovery system 200 based on air source heat pump from the input port 52, and the heat exchange fluid is output from the output port 51 after being heated by the condenser 24, 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 coil, a radiator, a floor heating coil, and the like.

[0087] 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 222, the fourth heat exchange channel 242, and the heat storage box 4, the dust removal flue gas waste heat recovery system 200 based on the air source heat pump may include: a driving pump 8, which is arranged on the channel between the input port 52 through the fourth heat exchange channel 242 to the output port 51 to drive the fluid to flow from the input port 52 to the fourth heat exchange channel 242.

[0088] As feasible, Figure 3 Schematic diagram of the structure of the dust removal flue gas waste heat recovery system based on the air source heat pump in the second embodiment of the present invention, Figure 4 FIG. 1 is a schematic diagram of the structure of the dust removal flue gas waste heat recovery system based on the air source heat pump in the third embodiment of the present invention. Figure 3 and Figure 4As shown, the dust removal flue gas waste heat recovery system 200 based on the air source heat pump may include: a first heat exchanger 1, the first heat exchanger 1 includes a fifth heat exchange channel 11 and a sixth heat exchange channel 12 capable of heat exchange, the fifth 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; the outlet of the sixth heat exchange channel 12 can be connected to the fourth heat exchange channel 242. 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.

[0089] The inlet of the sixth heat exchange flow channel 12 of the first heat exchanger 1 is used to input a 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 sixth heat exchange flow 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 fifth heat exchange flow channel 11 of the first heat exchanger 1 can reach a very low level, which can be below 30 degrees Celsius, close to the normal temperature, so that the waste heat recovery of the flue gas is more complete.

[0090] Since the temperature of the heat exchange fluid after passing through the sixth 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 utilization value. For example, conventional heating terminal equipment 10 cannot use such a heat exchange fluid with a relatively low temperature. Therefore, the heat exchange fluid needs to be reheated to improve its practical utilization value. Therefore, the heat exchange fluid output from the sixth heat exchange channel 12 can be reheated by the heat pump system 2. The heat exchange fluid output from the sixth 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 this part of the heat exchange fluid has a certain practical utilization value, and this part of the heat exchange fluid can be supplied to the heating terminal equipment 10 for use.

[0091] The present application can utilize the first heat exchanger 1 to recover the waste heat of the flue gas output from the dust collector. The heat exchange fluid output from the sixth 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. Since the heat exchange fluid output from the sixth 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 fifth 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. 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 initially heated heat exchange fluid output from the sixth heat exchange channel 12 of the first heat exchanger 1 through a heat pump with higher heating efficiency in the system, thereby making the heat exchange fluid have practical utilization value.

[0092] Furthermore, the output port 51 is communicated with the outlet of the fourth heat exchange channel 242. The input port 52 is communicated with the inlet of the sixth heat exchange channel 12. The driving pump 8 is used to drive the fluid to flow from the input port 52 to the sixth heat exchange channel 12.

[0093] like Figure 3 and Figure 4 As shown, the dust removal flue gas waste heat recovery system 200 based on the air source heat pump also includes: a heat storage box 4, which is connected between the outlet of the sixth heat exchange channel 12 and the inlet of the fourth heat exchange channel 242. The heat storage box 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.

[0094] As feasible, Figure 3 and Figure 4 As shown, 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 dust removal flue gas waste heat recovery system 200 based on the air source heat pump 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 driving 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 driving pump 8 is in an operating state, and the compressor 21 is in a closed state.

[0095] When the temperature of the heat exchange fluid heated by the sixth heat exchange channel 12 of the first heat exchanger 1 is not high enough, the dust removal flue gas waste heat recovery system 200 based on the air source heat pump can be switched to the first operating state, so as to perform secondary heating by 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 sixth heat exchange channel 12 of the first heat exchanger 1 is high enough, the dust removal flue gas waste heat recovery system 200 based on the air source heat pump can be switched to the second operating state, and the heat exchange fluid heated by the sixth heat exchange channel 12 of the first heat exchanger 1 is directly output from the output port 51 to the heating terminal device 10.

[0096] In one embodiment, Figure 4 As shown, the inlet of the second heat exchange channel 222 can be connected to the outlet of the fifth heat exchange channel 11. In another embodiment, as Figure 3 As shown, the second heat exchange channel 222 is arranged in parallel with the fifth heat exchange channel 11.

[0097] Especially when the inlet of the second heat exchange flow channel 222 is connected to the outlet of the fifth heat exchange flow channel 11, since the temperature of the air in nature is relatively low in winter or late autumn, much lower than the temperature of the flue gas discharged after heat exchange in the fifth heat exchange flow channel 11, this 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 fifth heat exchange flow channel 11 is then introduced into the second heat exchange flow channel 222 of the evaporator 22, thereby heating the refrigerant flowing through the first heat exchange flow channel 221 of the evaporator 22. Since the temperature of the gas exchanged between the evaporator 22 and the outside world 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.

[0098] When the second heat exchange channel 222 is arranged in parallel with the fifth heat exchange channel 11, since the flow rate of the flue gas input to the second heat exchange channel 222 is relatively large, it mainly depends on the output flow rate of the dust collector and is inconvenient to change it at will. The heat pump system 2 needs to have a large heating power to enable the evaporator 22 to more fully absorb the heat of the flue gas input to the second heat exchange channel 222. If the heating power of the heat pump system 2 is low or the heat load demand of the heating terminal equipment 10 is small at this time, the flue gas input to the second heat exchange channel 222 may not be reduced to a lower temperature after heat exchange, which will result in incomplete recovery of the waste heat of the flue gas.

[0099] 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 an inverted tank dust removal system; a dust removal flue gas waste heat recovery system 200 based on an air source heat pump such as any of the above-mentioned, the inlet of the second heat exchange channel 222 is connected to the outlet of the bag dust collector 100; a fan 300 and an exhaust chimney 400 connected in sequence, the inlet of the fan 300 is connected to the outlet of the second heat exchange channel 222.

[0100] The present application also proposes a dust removal flue gas waste heat recovery method based on an air source heat pump. The dust removal flue gas waste heat recovery method based on an air source heat pump may include:

[0101] 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 .

[0102] 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.

[0103] The flue gas output from the dust collector is heated by the refrigerant flowing through the first heat exchange channel 221 of the evaporator 22 through the second heat exchange channel 222 of the evaporator 22 of the heat pump system 2 .

[0104] As a feasible method, the temperature of the flue gas outputted by the dust collector can be between 80 degrees Celsius and 120 degrees Celsius. This dust collector is particularly suitable for ordinary bag dust collectors and filter cartridge dust collectors. Furthermore, 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, which can make the waste heat recovery of the flue gas more complete.

[0105] The input heat exchange fluid is heated through the fourth heat exchange channel 242 of the condenser 24 of the heat pump system 2, and the compressor 21, the first heat exchange channel 221, the throttling unit 23 and the third heat exchange channel 241 of the condenser 24 of the heat pump system 2 are connected in sequence to form a first circulation channel for the flow of refrigerant.

[0106] The heated heat exchange fluid is supplied to the heating terminal device 10 .

[0107] In this step, after the heat exchange fluid passes through the heating terminal device 10 to provide heat, it can flow back to the fourth heat exchange channel 242 of the condenser 24 .

[0108] As a feasible method, the dust removal flue gas waste heat recovery method based on air source heat pump may include:

[0109] The flue gas output from the dust collector is preliminarily heated by the heat exchange fluid flowing through the sixth heat exchange channel 12 of the first heat exchanger 1 through the fifth heat exchange channel 11 of the first heat exchanger 1 .

[0110] Corresponding to this step, the step of heating the input heat exchange fluid through the fourth heat exchange channel 242 of the condenser 24 of the heat pump system 2 may include: performing secondary heating on the heat exchange fluid flowing out of the sixth heat exchange channel 12 after preliminary heating through the fourth heat exchange channel 242 of the condenser 24 of the heat pump system 2. As feasible, after the heat exchange fluid passes through the heating terminal device 10 for heating, it can flow back to the sixth heat exchange channel 12 of the first heat exchanger 1.

[0111] Corresponding to this step, the step of heating the flue gas output from the dust collector to the refrigerant flowing through the first heat exchange channel 221 of the evaporator 22 through the second heat exchange channel 222 of the evaporator 22 of the heat pump system 2 may include: heating the flue gas discharged through the fifth heat exchange channel 11 of the first heat exchanger 1 to the refrigerant flowing through the first heat exchange channel 221 of the evaporator 22 through the second heat exchange channel 222 of the evaporator 22 of the heat pump system 2.

[0112] In other feasible implementations, the dust removal flue gas waste heat recovery method based on an air source heat pump may include:

[0113] 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 .

[0114] The present application can recover the waste heat of the flue gas discharged from the dust collector in the dust removal system, and use the second heat exchange channel 222 of the evaporator 22 of the heat pump system 2 to receive the flue gas output by the dust collector, and heat the refrigerant flowing through the first heat exchange channel 221 of the evaporator 22. The flue gas output by the dust collector is relatively higher than the temperature of the outside normal temperature air, and the part of the flue gas can be used to efficiently heat the refrigerant in the evaporator 22 of the heat pump system 2. Since the temperature of the gas exchanged between the evaporator 22 and the outside is further increased, the COP of the heat pump system 2 can be greatly improved, and the conversion efficiency of heat energy is greatly improved. Since the temperature of the gas exchanged between the evaporator 22 and the outside is greatly increased, the condenser 24 of the heat pump system 2 can heat the heat exchange fluid flowing through the fourth heat exchange channel 242 to a higher temperature, making it a high-quality heat energy, so that the heat exchange fluid has a higher practical utilization value. Finally, since the temperature of the refrigerant in the evaporator 22 can be very low, the temperature of the flue gas flowing through the second heat exchange channel 222 of the evaporator 22 can be reduced to a very low temperature, which can make the waste heat recovery of the flue gas more complete.

[0115] Furthermore, the present application can recover the waste heat of the flue gas discharged from the dust collector in the dust removal system, so as to preliminarily heat the heat exchange fluid through the sixth heat exchange channel 12 of the first heat exchanger 1. 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, and the temperature of the flue gas output from the fifth 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 sixth heat exchange channel 12 of the first heat exchanger 1 to a higher temperature, so that the heat exchange fluid has practical utilization value. Through the above method, the utilization of flue gas waste heat can be maximized, and the low-temperature thermal energy of the heat exchange fluid can be converted into high-temperature thermal energy of higher quality to meet heating and process requirements.

[0116] Furthermore, the flue gas output from the fifth heat exchange channel 11 of the first heat exchanger 1 can be input into the second heat exchange channel 222 of the evaporator 22 of the heat pump system 2. Especially in winter or late autumn, the temperature of the air in nature is relatively low, much lower than the temperature of the flue gas discharged after heat exchange in the fifth heat exchange channel 11. This can greatly improve the COP of the heat pump system 2, greatly improve the conversion efficiency of thermal energy, and further recycle the low-quality waste heat of the flue gas.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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 dust removal flue gas waste heat recovery system based on an air source heat pump, characterized in that: The dust removal flue gas waste heat recovery system based on air source heat pump includes: A heat pump system, the heat pump system comprising a compressor, an evaporator having a first heat exchange channel and a second heat exchange channel, a throttling unit, and a condenser having a third heat exchange channel and a fourth heat exchange channel, the first heat exchange channel and the second heat exchange channel being capable of heat exchange, the third heat exchange channel and the fourth heat exchange channel being capable of heat exchange, the compressor, the first heat exchange channel, the throttling unit, and the third heat exchange channel being sequentially connected to form a first circulation channel, and the second heat exchange channel being used to receive flue gas outputted by a dust collector; A solar power generation system is used to supply power to the compressor.

2. The dust removal flue gas waste heat recovery system based on air source heat pump according to claim 1 is characterized in that: The dust removal flue gas waste heat recovery system based on air source heat pump 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 fourth heat exchange channel.

3. The dust removal flue gas waste heat recovery system based on air source heat pump according to claim 2 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.

4. The dust removal flue gas waste heat recovery system based on air source heat pump according to claim 3 is characterized in that: The dust removal flue gas waste heat recovery system based on air source heat pump includes: A driving pump is disposed on a flow channel from the input port through the fourth heat exchange flow channel to the output port to drive the fluid to flow from the input port to the fourth heat exchange flow channel.

5. The dust removal flue gas waste heat recovery system based on air source heat pump according to claim 1 is characterized in that: The dust removal flue gas waste heat recovery system based on air source heat pump includes: The first heat exchanger comprises a fifth heat exchange channel and a sixth heat exchange channel capable of performing heat exchange, wherein the fifth heat exchange channel is used to receive the flue gas output by the dust collector; and the outlet of the sixth heat exchange channel can be connected to the fourth heat exchange channel.

6. The dust removal flue gas waste heat recovery system based on air source heat pump according to claim 5 is characterized in that: The dust removal flue gas waste heat recovery system based on air source heat pump includes: an output port, the output port being in communication with an outlet of the fourth heat exchange channel; an input port, the input port being in communication with an inlet of the sixth heat exchange flow channel; A driving pump is used to drive the fluid to flow from the input port toward the sixth heat exchange channel.

7. The dust removal flue gas waste heat recovery system based on air source heat pump according to claim 6 is characterized in that: The dust removal flue gas waste heat recovery system based on air source heat pump also includes: A heat storage box is connected between the outlet of the sixth heat exchange channel and the inlet of the fourth heat exchange channel.

8. The dust removal flue gas waste heat recovery system based on air source heat pump according to claim 7 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.

9. The dust removal flue gas waste heat recovery system based on air source heat pump according to claim 8, characterized in that: The dust removal flue gas waste heat recovery system based on air source heat pump 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.

10. The dust removal flue gas waste heat recovery system based on air source heat pump according to claim 5, characterized in that: The inlet of the second heat exchange channel is communicated with the outlet of the fifth heat exchange channel.

11. The dust removal flue gas waste heat recovery system based on air source heat pump according to claim 5, characterized in that: The second heat exchange channel is arranged in parallel with the fifth heat exchange channel.

12. The dust removal flue gas waste heat recovery system based on air source heat pump according to claim 1, 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.

13. The dust removal flue gas waste heat recovery system based on air source heat pump according to claim 12, 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.

14. The dust removal flue gas waste heat recovery system based on air source heat pump according to claim 12, characterized in that: The dust removal flue gas waste heat recovery system based on air source heat pump includes: 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 the power grid.

15. 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; According to the dust removal flue gas waste heat recovery system based on an air source heat pump as described in any one of claims 1 to 14, the inlet of the second heat exchange flow channel is connected to the outlet of the bag filter; The fan and the exhaust chimney are connected in sequence, and the inlet of the fan is connected to the outlet of the second heat exchange flow channel.

16. A dust removal flue gas waste heat recovery method based on an air source heat pump, characterized in that: The dust removal flue gas waste heat recovery method based on an air source heat pump 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 passed through the second heat exchange flow channel of the evaporator of the heat pump system to heat the refrigerant flowing through the first heat exchange flow channel of the evaporator; The input heat exchange fluid is heated through the fourth heat exchange channel of the condenser of the heat pump system, and the compressor, the first heat exchange channel, the throttling unit and the third heat exchange channel of the condenser of the heat pump system are sequentially connected to form a first circulation channel for the flow of refrigerant; The heated heat exchange fluid is supplied to the heating terminal equipment.

17. The dust removal flue gas waste heat recovery method based on air source heat pump according to claim 16, 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 evaporator is less than or equal to 30 degrees Celsius.

18. The dust removal flue gas waste heat recovery method based on air source heat pump according to claim 16, 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.

19. The dust removal flue gas waste heat recovery method based on air source heat pump according to claim 16, characterized in that: The dust removal flue gas waste heat recovery method based on an air source heat pump comprises: The flue gas outputted from the dust collector is preliminarily heated by the heat exchange fluid flowing through the sixth heat exchange channel of the first heat exchanger through the fifth heat exchange channel of the first heat exchanger; The step of heating the input heat exchange fluid through the fourth heat exchange flow channel of the condenser of the heat pump system comprises: The heat exchange fluid that has been preliminarily heated and flows out of the sixth heat exchange flow channel is secondarily heated through the fourth heat exchange flow channel of the condenser of the heat pump system.

20. The dust removal flue gas waste heat recovery method based on air source heat pump according to claim 19, characterized in that: The dust removal flue gas waste heat recovery method based on an air source heat pump 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.

21. The dust removal flue gas waste heat recovery method based on air source heat pump according to claim 19, characterized in that: The step heats the flue gas outputted from the dust collector through the second heat exchange flow channel of the evaporator of the heat pump system to heat the refrigerant flowing through the first heat exchange flow channel of the evaporator, comprising: The flue gas exhausted through the fifth heat exchange channel of the first heat exchanger is passed through the second heat exchange channel of the evaporator of the heat pump system to heat the refrigerant flowing through the first heat exchange channel of the evaporator.

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