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

Abstract

The application 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.The dust removal flue gas waste heat recovery system based on the air source heat pump comprises a heat pump system, a solar power generation system, and the heat pump system comprises 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.The solar power generation system is used for supplying power to the compressor.The application can solve the problems of incomplete flue gas waste heat recovery, low recovery rate of the existing dust removal system and the problem of COP reduction of the air source heat pump system caused by low evaporator environmental temperature of the air source heat pump system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of dust removal system energy recovery, 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

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

[0003] In recent years, with the enhancement of social environmental protection consciousness, new energy photovoltaic power generation as an environmentally friendly and low-cost power generation technology has been widely applied. Photovoltaic power generation is to use the photovoltaic effect to absorb incident sunlight to generate electron-hole pairs, and under the action of the built-in electric field of the semiconductor p-n junction, the electrons and holes move to the positive and negative electrodes respectively to form an electric current. It is composed 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, and concentrated solar cells. The main feature of photovoltaic power generation is that it can be used as a distributed power source, installed near the load, and does not need to be transmitted over long distances. At the same time, it can be installed modularly, with a scale that can be arbitrarily adjusted, and can be installed on roofs and walls without occupying land. Photovoltaic power generation coincides with the peak of daytime electricity consumption, so it can enjoy peak electricity prices and also reduce the peak of the power grid.

[0004] In addition, there are a variety of industrial waste heat in industrial production, and fully recovering and utilizing these heat energy has great potential to improve energy utilization efficiency. In particular, in the steel industry, large-scale dust removal systems are set up to meet environmental protection requirements, and a large amount of waste heat generated by the process is discharged into the atmosphere with dust-containing flue gas through the dust removal system, so the utilization of this part of waste heat is of great significance. For example, in the steel industry, the dust removal system of the cast house, the dust removal system of the electric furnace, the secondary dust removal system of the converter, the dust removal system of the refining, the dust removal system of the desulfurization, and the dust removal system of the inverted ladle have high flue gas temperatures and good recycling value. Considering that the dust in the flue gas before the inlet of the dust collector is large, the recycling equipment has high requirements, and although a part of the heat will be lost when recycling the flue gas waste heat from the outlet of the dust collector, comprehensive consideration of factors such as equipment investment and service life makes it more cost-effective. SUMMARY

[0005] Currently, hot water is used to recover waste heat from the flue gas at the inlet of an electrostatic precipitator. The resulting hot water is then used to heat the ash hopper of the electrostatic precipitator to improve the flowability of the dust collected in the hopper. The applicant has found that recovering waste heat from the flue gas before the precipitator can negatively impact the heat exchange of the subsequent dust-laden flue gas, thus shortening the lifespan of the heat recovery equipment. Furthermore, using traditional heat exchangers for waste heat recovery and directly utilizing the heat results in low recovery efficiency and a low utilization rate of the recovered heat.

[0006] In addition, there is currently a combined solar air collector and air source heat pump heating system that uses both to improve system efficiency. The applicant found that the hot air obtained by the solar air collector in this method has poor stability and is greatly affected by the environment; moreover, this method does not reduce the system's electrical energy input; in fact, the electrical energy introduced into the system by the solar air collector actually 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 based on an air source heat pump, and a dust removal system, which can solve the problems of incomplete recovery of flue gas waste heat and low recovery rate of existing dust removal systems, as well as the problem of reduced COP of air source heat pump systems caused by low ambient temperature of evaporator.

[0008] The specific technical solution of this invention is as follows:

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

[0010] A heat pump system includes 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 are capable of heat exchange, and the third heat exchange channel and the fourth heat exchange channel are capable of heat exchange. The compressor, the first heat exchange channel, the throttling unit, and the third heat exchange channel are sequentially connected to form a first circulation channel. The second heat exchange channel is used to receive flue gas output from a dust collector.

[0011] A solar power generation system for supplying power to the compressor.

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

[0013] An output port, which is connected to the outlet of the fourth heat exchange channel;

[0014] An input port is connected to the inlet of the fourth heat exchange channel.

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

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

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

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

[0019] The first heat exchanger includes a fifth heat exchange channel and a sixth heat exchange channel capable of heat exchange. The fifth heat exchange channel is used to receive flue gas output from the dust collector. 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 an air source heat pump includes:

[0021] An output port, which is connected to the outlet of the fourth heat exchange channel;

[0022] An input port, which is connected to the inlet of the sixth heat exchange channel;

[0023] A drive pump is used to drive 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 an air source heat pump further 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 box is connected to the fourth heat exchange channel through a first pipeline; a first on / off valve is provided on the first pipeline;

[0027] The outlet of the heat storage box is connected to the output port through a second pipeline; a second on / off valve is provided on the second pipeline.

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

[0029] In the first operating state, the first on-off valve is in the open state, the second on-off valve is in the closed state, the drive pump is in the operating state, and the compressor is in the operating state.

[0030] In the second operating state, the first on-off valve is in the closed state, the second on-off valve is in the open state, the drive pump is in the running state, and the compressor is in the closed state.

[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 includes:

[0034] Solar panels;

[0035] An inverter, wherein the DC terminal of the inverter is electrically connected to the solar panel, and the AC terminal of the inverter is electrically connected to the compressor.

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

[0037] The energy storage unit has its input terminal electrically connected to the solar panel and its output terminal electrically connected to the DC terminal of the inverter.

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

[0039] A power input terminal is provided for electrical connection to the power grid, and the power input terminal is also electrically connected to the compressor.

[0040] The electrical output terminal is electrically connected to the AC terminal of the inverter and is used to supply power to the power grid.

[0041] A dust removal system, the dust removal system comprising:

[0042] The bag filter is a bag filter used in at least one of the following dust removal systems in the steel production process: iron tapping area dust removal system, electric furnace primary dust removal system, converter secondary dust removal system, refining dust removal system, desulfurization dust removal system, and inverted tank dust removal system.

[0043] In any of the above-described air-source heat pump-based dust removal flue gas waste heat recovery systems, the inlet of the second heat exchange channel is connected to the outlet of the bag filter.

[0044] A fan and an exhaust stack are connected in sequence, with the inlet of the fan connected to the outlet of the second heat exchange channel.

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

[0046] The direct current generated by the solar panels is converted into alternating current by an inverter to power the compressor of the heat pump system.

[0047] The flue gas output from the dust collector is heated by passing the refrigerant flowing through the first heat exchange channel of the evaporator in the heat pump system through the second heat exchange 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. 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 connected in sequence to form a first circulation channel for the refrigerant to flow.

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

[0050] Preferably, the temperature of the flue gas output by the dust collector is between 80 degrees Celsius and 120 degrees Celsius, and the temperature of the flue gas output after heat exchange 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 by 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 generates electricity under sunlight, the direct current generated by the solar panel is converted into alternating current by the inverter to power the compressor of the heat pump system.

[0053] When the solar panel generates electricity from sunlight and the compressor of the heat pump system is not running, the direct current generated by the solar panel is stored through the energy storage unit.

[0054] When the solar panel is not generating electricity and the compressor of the heat pump system is running, the DC power output by the energy storage unit is converted into AC power by the inverter and then used to power the compressor of the heat pump system.

[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 generates electricity under sunlight, the compressor of the heat pump system is not running, and the energy storage unit is fully charged, the direct current generated by the solar panel is converted into alternating current by the inverter and then supplied to the power grid.

[0057] Preferably, the method for recovering waste heat from dust removal flue gas based on an air source heat pump includes:

[0058] The flue gas output from the dust collector is preheated by passing through the fifth heat exchange channel of the first heat exchanger to the heat exchange fluid flowing through the sixth heat exchange channel of the first heat exchanger.

[0059] The step involves heating the input heat exchange fluid through the fourth heat exchange channel of the condenser of the heat pump system, including:

[0060] The heat exchange fluid that has been initially heated is then reheated by the fourth heat exchange channel of the condenser of the heat pump system.

[0061] Preferably, the method for recovering waste heat from dust removal flue gas based on an air source heat pump includes:

[0062] When the compressor of the heat pump system is not running, the preheated heat exchange fluid is directly supplied to the heating terminal equipment.

[0063] Preferably, the step of heating the flue gas output from the dust collector by passing it through the second heat exchange channel of the evaporator of the heat pump system to the refrigerant flowing through the first heat exchange channel of the evaporator includes:

[0064] The flue gas discharged through the fifth heat exchange channel of the first heat exchanger is heated by the refrigerant flowing through the first heat exchange channel of the evaporator of the heat pump system through the second heat exchange channel of the evaporator.

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

[0066] This application utilizes the second heat exchange channel of the evaporator in a heat pump system to receive flue gas output from a dust collector, thereby recovering the waste heat of the flue gas and heating the refrigerant flowing through the first heat exchange channel of the evaporator. The temperature of the flue gas output from the dust collector is generally higher than that of ambient air, allowing for efficient heating of the refrigerant in the evaporator. Because the temperature of the gas exchanging heat with the outside environment is further increased, the COP of the heat pump system can be significantly improved, greatly enhancing the thermal energy conversion efficiency. The compressor of the heat pump system is powered by a solar power system, reducing or eliminating reliance on the power grid. Due to the significantly increased temperature of the gas exchanging heat with the outside environment, the condenser of the heat pump system can heat the heat exchange fluid flowing through the fourth heat exchange channel to an even higher temperature, transforming it into high-quality thermal energy and thus giving the heat exchange fluid greater 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 channel of the evaporator can be reduced to a very low temperature, which allows for more complete recovery of waste heat from the flue gas.

[0067] Specific embodiments of the invention are disclosed in detail below with reference to the description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the invention are not therefore limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0068] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

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

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

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

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

[0073] The reference numerals in the above figures are as follows:

[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. Energy storage unit; 4. Heat storage box; 51. Output port; 52. Input port; 61. Power input terminal; 62. Electricity output terminal; 8. Drive pump; 91. First on / off valve; 92. Second on / off 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 Implementation

[0075] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0076] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0077] To address the issues of incomplete and low-efficiency waste heat recovery from flue gas in existing dust removal systems, as well as the reduced COP of air source heat pump systems due to low evaporator ambient temperatures, this application proposes a dust removal flue gas waste heat recovery system 200 based on an air source heat pump. Figure 1 This is a schematic diagram of the dust removal flue gas waste heat recovery system based on an air source heat pump combined with a bag filter in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of the dust removal flue gas waste heat recovery system based on an air source heat pump in the first embodiment of the present invention, as shown below. Figure 1 and Figure 2As shown, the dust removal flue gas waste heat recovery system 200 based on an air source heat pump may include: a heat pump system 2, which 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 are capable of heat exchange, and the third heat exchange channel 241 and the fourth heat exchange channel 242 are capable of heat exchange. The compressor 21, the first 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 second heat exchange channel 222 is used to receive the flue gas output from the dust collector. A solar power generation system 3 is used to supply power to the compressor 21.

[0078] This application utilizes the second heat exchange channel 222 of the evaporator 22 of the heat pump system 2 to receive the flue gas output from the dust collector, thereby recovering the waste heat of the flue gas and heating the refrigerant flowing through the first heat exchange channel 221 of the evaporator 22. The temperature of the flue gas output from the dust collector is generally higher than that of the ambient air, allowing for efficient heating of the refrigerant in the evaporator 22 of the heat pump system 2. Because the temperature of the gas exchanging heat between the evaporator 22 and the outside environment is further increased, the COP of the heat pump system 2 can be significantly improved, greatly enhancing the thermal energy conversion efficiency. The compressor 21 of the heat pump system 2 is powered by a solar power generation system 3, thereby reducing or eliminating the need for grid power. Since the temperature of the gas exchanging heat between the evaporator 22 and the outside environment is significantly 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 an even higher temperature, transforming it into high-quality thermal energy and thus giving the heat exchange fluid greater 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 makes the waste heat recovery of the flue gas more complete.

[0079] The dust collection flue gas waste heat recovery system 200 based on an air source heat pump in this application is applicable to flue gas output from ordinary bag filters, cartridge filters, high-temperature bag filters, and electrostatic precipitators. Ordinary bag filters or cartridge filters can withstand temperatures up to 130°C, and after treating high-temperature flue gas, the outlet flue gas temperature is approximately 80°C to 120°C. High-temperature bag filters can withstand temperatures up to 280°C, and after treating high-temperature flue gas, the outlet flue gas temperature is approximately 180°C to 220°C. Electrostatic precipitators also exhibit high recovery efficiency when the outlet flue gas temperature is >80°C. Preferably, because the outlet flue gas temperature of some dust collectors is relatively low, the degree of waste heat recovery by other energy recovery systems is low. The dust collection flue gas waste heat recovery system 200 based on an air source heat pump in this application can effectively target ordinary bag filters and cartridge filters to improve the degree of waste heat recovery from the flue gas.

[0080] Taking a conventional baghouse dust collector system as an example, when dealing with high-temperature flue gas (such as secondary flue gas from converters, dust removal flue gas from refining processes, dust removal flue gas from desulfurization and dephosphorization processes, and dust removal flue gas from inverted drums), the dust-laden, high-temperature flue gas enters the conventional baghouse dust collector through a dust collector hood, regulating valve, and pipeline for purification. The temperature of the purified flue gas is approximately 80℃ to 120℃. A waste heat recovery system based on an air source heat pump can be added to the outlet of the conventional baghouse 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, silencer, and 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. 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, in which refrigerant circulates to transfer energy. The second heat exchange channel 222 is used to receive flue gas output from a dust collector, which 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 introduce the heat exchange fluid that needs to be heated. The third heat exchange channel 241 carries 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, thus giving this portion of the heat exchange fluid practical value. This portion of the heat exchange fluid can be supplied to the heating terminal equipment 10. Furthermore, a liquid storage tank 25 can also be provided on the first circulation channel for storing 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] The temperature of the flue gas output from the dust collector is generally higher than that of the ambient air. Even for ordinary bag filters and cartridge filters, the minimum outlet flue gas temperature is at least 80℃, far exceeding the ambient air temperature. This flue gas is used to efficiently heat the refrigerant in the evaporator 22 of the heat pump system 2. Because the temperature of the gas exchanging heat between the evaporator 22 and the outside environment is further increased, the COP of the heat pump system 2 can be significantly improved, greatly enhancing the thermal energy conversion efficiency. Especially in winter or late autumn, when the ambient air temperature is low, using ambient air to heat the refrigerant in the evaporator 22 of the heat pump system 2 would result in very poor heating, leading to a very low COP and low thermal energy conversion efficiency for the entire heat pump system 2. Because the temperature of the gas exchanging heat with the outside environment in the evaporator 22 is significantly 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, thus giving the heat exchange fluid 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, down to a few degrees Celsius or below zero, or even tens of degrees below zero. Depending on the type of refrigerant, the temperature of the refrigerant can also be controlled. Therefore, through 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, making the waste heat recovery from the flue gas more complete.

[0083] The energy input of heat pump system 2 consists of the electrical energy input to compressor 21 and the energy input from heat exchange between evaporator 22 and the outside gas. To reduce the electricity input from the grid for the photovoltaic and air-source heat pump coupled heat recovery system utilizing waste heat from the dust removal system's flue gas, thereby lowering operating costs, a solar power generation system 3 is used to power compressor 21. For example... Figure 2 As shown, the solar power generation system 3 may include: a solar panel 31; an inverter 32, the DC terminal of which is electrically connected to the solar panel 31, and the AC terminal of which 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 a feasible option, such as Figure 2 As shown, the solar power generation system 3 may include an energy storage unit 33, whose input terminal is electrically connected to the solar panel 31, and whose output terminal is electrically connected to the DC terminal of the inverter 32. When the solar panel 31 generates a large amount of electricity, or when the compressor 21 is not running, the excess electrical energy can be input into the energy storage unit 33 for storage and backup. When the solar panel 31 generates insufficient electricity, it can work in conjunction with the energy storage unit 33 to supply power to the compressor 21.

[0085] A photovoltaic and air-source heat pump coupled heat recovery system utilizing waste heat from flue gas in a dust removal system may include: a power input terminal 61, which is electrically connected to the power grid A and the compressor 21; and an output terminal 62, which is electrically connected to the AC terminal of the inverter 32 and is used to supply power to the power grid. When the solar panel 31 generates a large amount of electricity, or when the compressor 21 is not running, the excess electrical energy can be converted into AC power by the inverter 32 and supplied to the power grid. When the solar panel 31 does not generate electricity and the energy storage unit 33 is depleted, 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 an air source heat pump may include: an output port 51, which is connected to the outlet of the fourth heat exchange channel 242; and an input port 52, which is connected to the inlet of the fourth heat exchange channel 242. Heat exchange fluid can be input into the dust removal flue gas waste heat recovery system 200 based on the input port 52. After being heated by the condenser 24, the heat exchange fluid is output from the output port 51 to supply the heating terminal equipment 10. The heating terminal equipment 10 may include at least one of the following: an air curtain, a wall-mounted air conditioner, a fan coil unit, a radiator, a floor heating coil, etc.

[0087] To achieve the purpose of recycling the heat exchange fluid output from output port 51, saving heat exchange fluid, and increasing the temperature of the heat exchange fluid input to input port 52, output port 51 and input port 52 are respectively connected to the inlet and outlet of the heating terminal device 10. In this way, the heat exchange fluid output from 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 then flow back to input port 52. In order to drive the heat exchange fluid to circulate among 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 drive pump 8, which is installed on the channel between input port 52 and output port 51 through the fourth heat exchange channel 242 to drive the fluid to flow from input port 52 to the fourth heat exchange channel 242.

[0088] As a feasible option, Figure 3 This is a schematic diagram of the structure of the dust removal flue gas waste heat recovery system based on an air source heat pump in a second embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of the dust removal flue gas waste heat recovery system based on an air source heat pump in the third embodiment of the present invention, as shown below. Figure 3 and Figure 4As shown, the dust removal flue gas waste heat recovery system 200 based on an air source heat pump may include: a first heat exchanger 1, which 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 from the dust collector, thereby recovering and utilizing 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, equipment investment can be reduced and the service life of the equipment can be increased.

[0089] The inlet of the sixth heat exchange channel 12 of the first heat exchanger 1 is used to input heat exchange fluid, thereby using flue gas to heat the heat exchange fluid to recover waste heat from the flue gas. The heat exchange fluid output from the sixth heat exchange channel 12 of the first heat exchanger 1 only needs to be preheated, and the output temperature does not need to be very high. Therefore, a large amount of low-temperature heat exchange fluid can be used, which greatly improves the cooling effect on the flue gas, resulting in a greater cooling range. 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, down to below 30 degrees Celsius, close to room temperature, making the recovery of waste heat from the flue gas more complete.

[0090] Because the temperature of the heat exchange fluid is low after passing through the sixth heat exchange channel 12 of the first heat exchanger 1, such a low-temperature heat exchange fluid has little practical value. For example, conventional heating terminal equipment 10 cannot use this low-temperature heat exchange fluid. Therefore, the heat exchange fluid needs to be reheated to improve its practical value. Thus, the heat exchange fluid output from the sixth heat exchange channel 12 can be reheated using the heat pump system 2. The heat exchange fluid output from the sixth heat exchange channel 12 then flows into the fourth heat exchange channel 242 for further reheating. The temperature of the heat exchange fluid flowing out of the fourth heat exchange channel 242 is increased, thus giving this portion of the heat exchange fluid some practical value. This portion of the heat exchange fluid can be supplied to the heating terminal equipment 10.

[0091] This application utilizes the first heat exchanger 1 to recover waste heat from the flue gas output by the dust collector. The pre-heated heat exchange fluid output from the sixth heat exchange channel 12 of the first heat exchanger 1 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 higher-temperature heat exchange fluid. This higher-temperature heat exchange fluid can be used to supply the heating terminal equipment 10. Since the heat exchange fluid output from the sixth heat exchange channel 12 of the first heat exchanger 1 only needs to be pre-heated, the output temperature does not need to be very high. Therefore, a large amount of low-temperature heat exchange fluid can be used to greatly improve the cooling effect on the flue gas, resulting in a greater cooling range. 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, below 30 degrees Celsius, close to room temperature, making the waste heat recovery from the flue gas more complete. The above process can solve the problem of incomplete recovery of waste heat from flue gas in existing dust removal systems, maximize the utilization of waste heat from flue gas, and further reheat the heat exchange fluid output from the sixth heat exchange channel 12 of the first heat exchanger 1 by using 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 connected to the outlet of the fourth heat exchange channel 242. The input port 52 is connected to the inlet of the sixth heat exchange channel 12. The drive pump 8 is used to drive the fluid to flow from the input port 52 towards 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 an air source heat pump also includes a heat storage tank 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 tank 4 can hold a large amount of heat exchange fluid, thereby achieving the purpose of heat storage, and can also ensure that the temperature of the heat exchange fluid input to the fourth heat exchange channel 242 is more stable.

[0094] As a feasible option, such as Figure 3 and Figure 4 As shown, the outlet of the heat storage box 4 is connected to the fourth heat exchange channel 242 through a first pipeline; a first on / off valve 91 is installed on the first pipeline. The outlet of the heat storage box 4 is connected to the output port 51 through a second pipeline; a second on / off valve 92 is installed 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 on / off valve 91 is in the open state, the second on / off valve 92 is in the closed state, the drive pump 8 is in the operating state, and the compressor 21 is in the operating state; in the second operating state, the first on / off valve 91 is in the closed state, the second on / off valve 92 is in the open state, the drive pump 8 is in the operating state, and the compressor 21 is in the closed state.

[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, thereby utilizing the fourth heat exchange channel 242 of the condenser 24 of the heat pump system 2 for secondary heating. 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, directly outputting the heat exchange fluid heated by the sixth heat exchange channel 12 of the first heat exchanger 1 from the output port 51 to supply the heating terminal equipment 10.

[0096] In one implementation, such as 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 and the fifth heat exchange channel 11 are arranged in parallel.

[0097] Especially when the inlet of the second heat exchange channel 222 is connected to the outlet of the fifth heat exchange channel 11, the ambient air temperature 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 channel 11. Therefore, this flue gas can be used to heat the evaporator 22 of the heat pump system 2. Thus, the flue gas discharged after heat exchange in the fifth heat exchange channel 11 is then introduced into the second heat exchange channel 222 of the evaporator 22, thereby heating the refrigerant flowing through the first heat exchange channel 221 of the evaporator 22. Because the temperature of the gas exchanging heat between the evaporator 22 and the outside environment is further increased, especially in winter or late autumn, the COP of the heat pump system 2 can be greatly improved, significantly increasing the thermal energy conversion efficiency.

[0098] When the second heat exchange channel 222 and the fifth heat exchange channel 11 are connected in parallel, the flow rate of the flue gas input to the second heat exchange channel 222 is relatively large, which mainly depends on the output flow rate of the dust collector and cannot be actively changed at will. The heat pump system 2 needs to have a large heating power to enable the evaporator 22 to 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, the flue gas input to the second heat exchange channel 222 may not be able to be reduced to a lower temperature after heat exchange, which will result in incomplete recovery of waste heat from the flue gas.

[0099] like Figure 1As shown, this application also proposes a dust removal system, which may include: a bag filter 100, which is a bag filter 100 in at least one of the following dust removal systems in the steel production process: iron tapping area dust removal system, electric furnace primary dust removal system, converter secondary dust removal system, refining dust removal system, desulfurization dust removal system, and inverted tank dust removal system; a dust removal flue gas waste heat recovery system 200 based on an air source heat pump, such as any of the above, wherein the inlet of the second heat exchange channel 222 is connected to the outlet of the bag filter 100; and a fan 300 and an exhaust stack 400 connected in sequence, wherein the inlet of the fan 300 is connected to the outlet of the second heat exchange channel 222.

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

[0101] The direct current generated by the solar panel 31 is converted into alternating current by the inverter 32 and then used to power 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 generates electricity from sunlight, the direct current (DC) generated by the solar panel 31 is converted into alternating current (AC) by the inverter 32 to power the compressor 21 of the heat pump system 2. When the solar panel 31 generates electricity from sunlight but the compressor 21 of the heat pump system 2 is not running, the DC power generated by the solar panel 31 is stored in the energy storage unit 33. When the solar panel 31 does not generate electricity but the compressor 21 of the heat pump system 2 is running, the energy storage unit 33... The output DC power is converted into AC power by inverter 32 and then used to power the compressor 21 of heat pump system 2. When the solar panel 31 does not generate electricity, the compressor 21 of heat pump system 2 is running, and the energy storage unit 33 is low on power, the grid is used to power the compressor 21 of heat pump system 2. When the solar panel 31 generates electricity from sunlight, the compressor 21 of heat pump system 2 is not running, and the energy storage unit 33 is fully charged, the DC power generated by the solar panel 31 is converted into AC power by inverter 32 and then used to power the 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 via the second heat exchange channel 222 of the evaporator 22 of the heat pump system 2.

[0104] As is feasible, the temperature of the flue gas output by the dust collector can be between 80 degrees Celsius and 120 degrees Celsius. This type of dust collector is particularly suitable for ordinary bag dust collectors and cartridge dust collectors. Furthermore, the temperature of the flue gas output after heat exchange through the first heat exchanger 1 is less than or equal to 30 degrees Celsius, which allows for more complete recovery of waste heat from the flue gas.

[0105] The input heat exchange fluid is heated by the fourth heat exchange channel 242 of the condenser 24 of the heat pump system 2. 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 the first circulation channel for the refrigerant to flow.

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

[0107] In this step, after the heat exchange fluid is heated by the heating terminal equipment 10, it can flow back to the fourth heat exchange channel 242 of the condenser 24.

[0108] As a feasible method for recovering waste heat from dust removal flue gas based on an air source heat pump, it may include:

[0109] The flue gas output from the dust collector is preheated by the heat exchange fluid flowing through the sixth heat exchange channel 12 of the first heat exchanger 1 via 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: reheating the heat exchange fluid that has been initially heated and flows out of the sixth heat exchange channel 12 through the fourth heat exchange channel 242 of the condenser 24 of the heat pump system 2. Alternatively, after the heat exchange fluid is heated by the heating terminal device 10, 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 via 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 via the second heat exchange channel 222 of the evaporator 22 of the heat pump system 2.

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

[0113] When the compressor 21 of the heat pump system 2 is not running, the preheated heat exchange fluid is directly supplied to the heating terminal equipment 10.

[0114] This application can recover the waste heat of the flue gas discharged from the dust collector in a dust removal system. The second heat exchange channel 222 of the evaporator 22 of the heat pump system 2 receives the flue gas output from the dust collector and heats the refrigerant flowing through the first heat exchange channel 221 of the evaporator 22. The temperature of the flue gas output from the dust collector is generally higher than that of the ambient air. This flue gas can be used to efficiently heat the refrigerant in the evaporator 22 of the heat pump system 2. Because the temperature of the gas exchanging heat between the evaporator 22 and the outside environment is further increased, the COP of the heat pump system 2 can be greatly improved, significantly increasing the thermal energy conversion efficiency. Since the temperature of the gas exchanging heat between the evaporator 22 and the outside environment is significantly 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 an even higher temperature, making it high-quality thermal energy, thus giving the heat exchange fluid 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 makes the waste heat recovery of the flue gas more complete.

[0115] Furthermore, this application can recover the waste heat of the flue gas discharged from the dust collector in the dust removal system. This waste heat is initially heated by 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, thereby greatly improving the cooling effect on the flue gas and resulting in a greater cooling rate. 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, below 30 degrees Celsius, close to room temperature, making the waste heat recovery from the flue gas more complete. Subsequently, a heat pump with higher heating efficiency within the system can further reheat the initially heated heat exchange fluid output from the sixth heat exchange channel 12 of the first heat exchanger 1 to a higher temperature, thus giving the heat exchange fluid practical utilization value. Through the above method, the utilization of waste heat from the flue gas can be maximized, and the low-temperature heat energy of the heat exchange fluid can be converted into higher-quality high-temperature heat energy 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 to 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 thermal energy conversion efficiency, and further recover and utilize the low-quality waste heat of the flue gas.

[0117] The system can utilize renewable solar power to supply the heat pump, and in conjunction with the high-efficiency heating device heat pump system 2, it can achieve low-carbon or zero-carbon emissions, which helps 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 flue gas from the dust removal system can be operated in conjunction with the energy storage unit 33 and the power grid, a suitable power source can be selected for different situations. When the solar panel 31 generates too much electricity, it can store the energy or connect the electricity to the public power grid. Overall, it can greatly improve the stability of the system and increase the utilization rate of electricity.

[0119] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0120] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An air source heat pump based dust flue gas waste heat recovery system, characterized in that, The air source heat pump-based dust removal flue gas waste heat recovery system comprises: a heat pump system comprising a compressor, an evaporator with a first heat exchange channel and a second heat exchange channel, a throttling unit, and a condenser with 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 for receiving flue gas output by a dust remover; a solar power generation system used for supplying power to the compressor; a first heat exchanger comprising a fifth heat exchange channel and a sixth heat exchange channel capable of heat exchange, the fifth heat exchange channel being used for receiving flue gas output by the dust remover, and an outlet of the sixth heat exchange channel being capable of communicating with the fourth heat exchange channel; an output port communicating with an outlet of the fourth heat exchange channel; an input port communicating with an inlet of the fourth heat exchange channel. a driving pump used for driving fluid to flow from the input port to the fourth heat exchange channel. a heat storage box connected between an outlet of the sixth heat exchange channel and an inlet of the fourth heat exchange channel, an outlet of the heat storage box communicating with the fourth heat exchange channel through a first pipeline, a first on-off valve being arranged on the first pipeline, the outlet of the heat storage box communicating with the output port through a second pipeline, and a second on-off valve being arranged on the second pipeline. The air source heat pump-based dust removal flue gas waste heat recovery 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 a 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.

2. The air source heat pump based dust flue gas waste heat recovery system according to claim 1, wherein, The air source heat pump-based dust removal flue gas waste heat recovery system comprises: an output port communicating with an outlet of the fourth heat exchange channel; an input port communicating with an inlet of the fourth heat exchange channel.

3. The air source heat pump based dust flue gas waste heat recovery system according to claim 2, wherein, The output port and the input port are respectively used for communicating with an inlet and an outlet of a heating terminal device.

4. The air source heat pump based dust flue gas waste heat recovery system according to claim 3, wherein, The air source heat pump-based dust removal flue gas waste heat recovery system comprises: a driving pump arranged on a flow channel between the input port and the output port through the fourth heat exchange channel, so as to drive fluid to flow from the input port to the fourth heat exchange channel.

5. The air source heat pump based dust flue gas waste heat recovery system according to claim 1, wherein, An inlet of the second heat exchange channel communicates with an outlet of the fifth heat exchange channel.

6. The air source heat pump based dust flue gas waste heat recovery system according to claim 1, wherein, The second heat exchange channel and the fifth heat exchange channel are arranged in parallel.

7. The air source heat pump based dust flue gas waste heat recovery system according to claim 1, wherein, The solar power generation system comprises: a solar cell panel; an inverter, a direct current end of the inverter being electrically connected with the solar cell panel, and an alternating current end of the inverter being electrically connected with the compressor.

8. The air source heat pump based dust flue gas waste heat recovery system according to claim 7, wherein, The solar power generation system comprises: An electricity storage unit, an input end of which is electrically connected with the solar panel, and an output end of which is electrically connected with a direct current end of the inverter.

9. The air source heat pump based dust flue gas waste heat recovery system according to claim 7, wherein, The dust removal flue gas waste heat recovery system based on an air source heat pump comprises: A power input end for being electrically connected with a power grid, the power input end being electrically connected with the compressor; An electric output end, the electric output end being electrically connected with an alternating current end of the inverter, the electric output end being used for supplying power to the power grid.

10. A dust extraction system characterised in that, The dust removal system comprises: A bag-type dust collector, the bag-type dust collector being a bag-type dust collector in at least one of the following dust removal systems in a steel production process: a cast house dust removal system, an electric furnace primary dust removal system, a converter secondary dust removal system, a refining dust removal system, a desulfurization dust removal system, and a ladle reversal dust removal system; The dust removal flue gas waste heat recovery system based on an air source heat pump according to any one of claims 1 to 9, an inlet of the second heat exchange flow channel is in communication with an outlet of the bag-type dust collector; A fan and an exhaust chimney connected in sequence, an inlet of the fan being in communication with an outlet of the second heat exchange flow channel.

11. An air source heat pump based dust removal flue gas waste heat recovery method employing the air source heat pump based dust removal flue gas waste heat recovery system according to any one of claims 1 to 9, characterized in that, The dust removal flue gas waste heat recovery method based on an air source heat pump comprises: The direct current electricity generated by the solar panel in the solar power generation system is converted into alternating current electricity by the inverter, and then is used for supplying power to the compressor of the heat pump system; The flue gas output by the dust collector is heated by the second heat exchange flow channel of the evaporator of the heat pump system, and then is used for heating the refrigerant flowing through the first heat exchange flow channel of the evaporator; The input heat exchange fluid is heated by the fourth heat exchange flow channel of the condenser of the heat pump system, and the compressor, the first heat exchange flow channel, the throttling unit, and the third heat exchange flow channel of the condenser of the heat pump system are sequentially connected to form a first circulation flow channel for the refrigerant; The heated heat exchange fluid is supplied to a heating terminal device.

12. The air source heat pump based dust flue gas waste heat recovery method of claim 11, wherein, 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.

13. The air source heat pump based dust flue gas waste heat recovery method of claim 11, wherein, The direct current electricity generated by the solar panel is converted into alternating current electricity by the inverter, and then is used for supplying power to the compressor of the heat pump system, comprising: When the compressor of the heat pump system is running, and the solar panel is generating electricity under illumination, the direct current electricity generated by the solar panel is converted into alternating current electricity by the inverter, and then is used for supplying power to the compressor of the heat pump system; When the solar panel is generating electricity under illumination, and the compressor of the heat pump system is not running, the direct current electricity generated by the solar panel is stored by the electricity storage unit; When the solar panel is not generating electricity, and the compressor of the heat pump system is running, the direct current electricity output by the electricity storage unit is converted into alternating current electricity by the inverter, and then is used for supplying power to the compressor of the heat pump system; When the solar panel is not generating electricity, the compressor of the heat pump system is running, and the electricity storage unit is insufficient in power, the power grid is used for supplying power to the compressor of the heat pump system; When the solar panel is generating electricity under illumination, the compressor of the heat pump system is not running, and the electricity storage unit is full of power, the direct current electricity generated by the solar panel is converted into alternating current electricity by the inverter, and then is used for supplying power to the power grid.

14. The air source heat pump based dust flue gas waste heat recovery method of claim 11, wherein, The dust removal flue gas waste heat recovery method based on the air source heat pump comprises: The flue gas output by the dust remover is preliminarily heated by the fifth heat exchange channel of the first heat exchanger for the heat exchange fluid flowing through the sixth heat exchange channel of the first heat exchanger; The step of heating the input heat exchange fluid through the fourth heat exchange channel of the condenser of the heat pump system comprises: The preliminarily heated heat exchange fluid flowing out of the sixth heat exchange channel is secondarily heated through the fourth heat exchange channel of the condenser of the heat pump system.

15. The air source heat pump based dust flue gas waste heat recovery method of claim 14, wherein, The dust removal flue gas waste heat recovery method based on the air source heat pump comprises: When the compressor of the heat pump system is not running, the preliminarily heated heat exchange fluid is directly supplied to the heating terminal device.

16. The air source heat pump based dust flue gas waste heat recovery method of claim 14, wherein, The step of heating the flue gas output by the dust remover through the second heat exchange channel of the evaporator of the heat pump system for the refrigerant flowing through the first heat exchange channel of the evaporator comprises: The flue gas discharged through the fifth heat exchange channel of the first heat exchanger is heated through the second heat exchange channel of the evaporator of the heat pump system for the refrigerant flowing through the first heat exchange channel of the evaporator.

Images