Micro-channel heat exchanger direct heating machine

Abstract

The utility model relates to the technical field of heat supply and heating, in particular to a micro-channel heat exchanger direct heating machine which comprises a heat collection unit, a heat supply storage unit, a heat exchange unit, a direct heating unit, a control unit and an output unit. The heat exchange unit is arranged on the upstream of the direct heating unit, so that the heat supply medium can be effectively preheated, the heating time of the direct heating unit for the heat supply medium is effectively shortened, the overall heating efficiency of the direct heating unit for the heat supply medium is improved, meanwhile, the heat supply medium is preheated, and the heat supply efficiency of the direct heating unit is improved. According to the direct heating machine, the heat stress generated in the heating process of the heat supply medium can be effectively reduced, the direct heating unit is protected against damage, the service life of the direct heating unit is effectively prolonged, and meanwhile the heating efficiency of the direct heating machine for the low-temperature heat supply medium is further improved.

Description

Technical Field

[0001] This utility model relates to the field of heating technology, and in particular to a microchannel heat exchanger direct heating machine. Background Technology

[0002] Current single-circulation air source heat pump water heaters using a single working fluid cannot operate efficiently or even at all when the ambient air temperature is low due to their high compression ratio.

[0003] Chinese Patent CN202311228138.2 discloses a direct-heating hot water type ground source heat pump unit, which consists of a heat exchange mechanism, a cooling and heating cycle mechanism, and a domestic hot water mechanism. The heat exchange mechanism includes an air source heat exchanger and a ground source heat exchanger. The cooling and heating cycle mechanism includes a system controller, which is electrically connected to a compressor. The compressor is connected to an evaporator, a condenser 1, and a condenser 2 via pipelines. A gas-liquid separator is connected between the evaporator and the compressor. When the evaporator is heating, it is connected to an air source heat exchanger and a ground source heat exchanger via pipelines. When cooling, it is connected to an air conditioning terminal via pipelines. When the condenser 1 is heating, it is connected to a heated floor or other heating terminal via pipelines. When cooling, it is connected to an air source heat exchanger and a ground source heat exchanger via pipelines. A buffer water tank and the condenser 2 are connected in a loop through a primary cold water inlet pipe and a primary hot water outlet pipe.

[0004] Therefore, although the above solution can directly heat hot water, in special environments, the water temperature in the hot water system is too low, which prevents the heat pump unit from quickly heating the low-temperature water stored in the hot water system, resulting in low heating efficiency for low-temperature water. Utility Model Content

[0005] Therefore, this utility model provides a microchannel heat exchanger direct heating machine to overcome the problem of low heating efficiency caused by the inability to rapidly heat low-temperature heating media in the prior art.

[0006] To achieve the above objectives, this utility model provides a microchannel heat exchanger direct heating machine, comprising:

[0007] A heat collection unit, used to collect and store heat from the air;

[0008] A heating storage unit, which is used to store the heating medium to be exchanged;

[0009] A heat exchange unit, which is connected to the heat collection unit and the storage unit respectively, is used to preheat the heating medium by heat exchange. It includes several microchannel plates arranged in parallel to transport the heating medium and a heat exchange plate arranged between two adjacent microchannel plates to transport the heat exchange medium.

[0010] A direct heating unit, which is connected to the heat exchange unit, is used to heat the preheated heating medium output by the heat exchange unit.

[0011] A control unit, which is connected to the direct heating unit, is used to control the operating parameters of the direct heating unit;

[0012] An output unit, which is connected to the direct heating unit, is used to output the heating medium that has been heated by the direct heating unit.

[0013] Furthermore, the heat collection unit includes:

[0014] A heat collection device used to collect heat from the air;

[0015] A heat storage device, which is connected to the heat collection device, is used to receive and store the heat collected by the heat collection device.

[0016] Furthermore, the heat storage device is loaded with a heat exchange medium to absorb the heat collected by the heat collection device.

[0017] Furthermore, for a single microchannel plate, it includes:

[0018] A heating inlet pipe is located at one end of the microchannel plate to receive the heating medium;

[0019] Several flat tubes are arranged in parallel within the microchannel plate, and the liquid inlet end of each flat tube is connected to the liquid inlet pipe, so that the received heating medium moves in a laminar flow manner.

[0020] A heating outlet pipe is provided at one end of the microchannel plate away from the heating inlet pipe and is connected to the outlet end of each of the flat tubes, so as to output the heat exchanged heating medium from each flat tube to the microchannel plate.

[0021] Furthermore, for a single microchannel plate, the heating inlet pipe in the microchannel plate is connected to the heating outlet pipe in the microchannel plate located upstream therefrom, and the heating outlet pipe in the microchannel plate is connected to the heating inlet pipe in the microchannel plate located downstream therefrom.

[0022] Furthermore, the heating inlet pipe of the upstream microchannel plate is connected to the heating storage unit to transport the heating medium into the microchannel plate; the heating outlet pipe of the downstream microchannel plate is connected to the direct heating unit to output the heat-exchanged heating medium to the direct heating unit.

[0023] Furthermore, the equivalent diameter of the channel of each of the flat tubes is 10-1000 μm.

[0024] Furthermore, for a single heat exchange plate, it includes:

[0025] A heat exchange inlet pipe is provided at one end of the heat exchange plate to receive the heat exchange medium;

[0026] A heat exchange channel is formed inside the heat exchange plate and the liquid inlet end of the heat exchange channel is connected to the heat exchange liquid inlet pipe for conveying the heat exchange medium received by the heat exchange liquid inlet pipe.

[0027] A heat exchange outlet pipe is provided at the end of the heat exchange plate away from the heat exchange inlet pipe and is connected to the outlet end of the heat exchange channel, for discharging the heat exchange medium that has completed heat exchange from the heat exchange channel to the heat exchange plate.

[0028] Furthermore, for a single heat exchange plate, the heat exchange inlet pipe in the heat exchange plate is connected to the heat exchange outlet pipe in the heat exchange plate located upstream thereupon, and the heat exchange outlet pipe in the heat exchange plate is connected to the heat exchange inlet pipe in the heat exchange plate located downstream theredownon.

[0029] Furthermore, the heat exchange inlet pipe of the upstream heat exchange plate is connected to the heat storage device to transport the heat exchange medium into the heat exchange plate; the heat exchange outlet pipe of the downstream heat exchange plate is connected to the heat storage device to return the heat exchange medium after heat exchange to the heat storage device.

[0030] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting a heat exchange unit upstream of the direct heating unit, this utility model can effectively complete the preheating treatment of the heating medium and effectively reduce the heating time of the direct heating unit for the heating medium, thereby improving the overall heating efficiency of the direct heating unit for the heating medium. At the same time, by preheating the heating medium, the thermal stress generated by the heating medium during the heating process can be effectively reduced, protecting the direct heating unit from damage. While effectively improving the service life of the direct heating unit, this utility model further improves the heating efficiency of the direct heating machine for low-temperature heating media.

[0031] Furthermore, the heat exchange unit is also provided with alternating microchannel plates and heat exchange plates. By alternating the two, the heat exchange area of ​​the heating medium and the heat exchange medium during the heat exchange process can be effectively increased. While effectively improving the heat exchange efficiency of the heating medium and the heat exchange medium, the preheating efficiency of the heat exchange unit for the heating medium is also effectively improved, thereby further improving the heating efficiency of the direct heat exchanger of this utility model for low-temperature heating media.

[0032] Furthermore, the heat collection unit can directly absorb low-enthalpy heat from the ambient temperature and use it to heat the heat exchange medium without the need for electricity or other energy sources. At the same time, it can effectively meet the heat demand of the heat exchange medium for heat exchange, thereby ensuring the heat exchange efficiency between the heat exchange medium and the heating medium while effectively improving the preheating efficiency of the heating medium, thus further improving the heating efficiency of the direct heating machine of this invention for low-temperature heating media.

[0033] Furthermore, the heat collection unit is equipped with a heat collection device and a heat storage device. By using the heat collection device, the heat collection unit can quickly and efficiently absorb heat from the air during the heat collection process, thereby effectively improving the heat collection efficiency of the direct heat generator of this invention. At the same time, by storing the heat collected by the heat collection device in the heat exchange medium, heat dissipation can be effectively prevented while effectively improving the heat exchange efficiency between the heat exchange medium and the heating medium, thereby further improving the heating efficiency of the direct heat generator of this invention for low-temperature heating media.

[0034] Furthermore, the microchannel plate is provided with several flat tubes. By allowing the heating medium to move in a laminar flow manner within the flat tubes, the contact area between the heating medium and the heat exchange medium in each flat tube can be effectively guaranteed. This further improves the heat exchange efficiency between the heat exchange medium and the heating medium, while also further improving the preheating efficiency of the heating medium, thereby further improving the heating efficiency of the direct heating machine of this invention for low-temperature heating media.

[0035] Furthermore, the heating inlet and outlet pipes of two adjacent microchannel plates are connected sequentially to allow the heating medium to flow in an S-shape between the microchannel plates. This effectively increases the flow path of the heating medium and the contact time between the heating medium and the heat exchange medium. This further improves the heat exchange efficiency between the heat exchange medium and the heating medium, and also improves the preheating efficiency of the heating medium, thereby further improving the heating efficiency of the direct heating machine of this invention for low-temperature heating media.

[0036] Furthermore, each of the heat exchange plates is provided with a heat exchange channel. By moving the heat exchange medium in the heat exchange channel, the contact area between the heat exchange medium and the heating medium in each heat exchange channel can be effectively guaranteed. This not only further improves the heat exchange efficiency between the heat exchange medium and the heating medium, but also further improves the preheating efficiency of the heating medium, thereby further improving the heating efficiency of the direct heating machine of this utility model for low-temperature heating media.

[0037] Furthermore, the heat exchange inlet and outlet pipes of two adjacent heat exchange plates are connected sequentially to allow the heat exchange medium to flow in an S-shape between the heat exchange plates. This effectively increases the transport flow of the heat exchange medium and the contact time between the heating medium and the heat exchange medium. This further improves the heat exchange efficiency between the heat exchange medium and the heating medium, and also improves the preheating efficiency of the heating medium, thereby further improving the heating efficiency of the direct heat exchanger for low-temperature heating media described in this invention. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the microchannel heat exchanger direct heat exchanger described in this embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the heat exchange unit described in an embodiment of the present invention;

[0040] Figure 3 This is a side cross-sectional view of a single microchannel plate according to an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the structure of several microchannel plates described in embodiments of this utility model;

[0042] Figure 5 This is a side cross-sectional view of a single heat exchange plate in an embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the structure of several heat exchange plates described in embodiments of this utility model. Detailed Implementation

[0044] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0045] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0046] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] Please see Figure 1 The diagram shows the structure of the microchannel heat exchanger direct heating unit according to an embodiment of this utility model. The microchannel heat exchanger direct heating unit includes: a heat collection unit 1, a heat supply and storage unit 2, a heat exchange unit 3, a direct heating unit 4, a control unit 5, and an output unit 6. The heat collection unit 1 collects and stores heat from the air; the heat supply and storage unit 2 stores the heat supply medium to be exchanged; the heat exchange unit 3 is connected to both the heat collection unit 1 and the storage unit 2, and preheats the heat supply medium through heat exchange; the direct heating unit 4 is connected to the heat exchange unit 3, and heats the preheated heat supply medium output from the heat exchange unit 3; the control unit 5 is connected to the direct heating unit 4, and controls the operating parameters of the direct heating unit 4; the output unit 6 is connected to the direct heating unit 4, and outputs the heat supply medium heated by the direct heating unit 4.

[0048] When the direct heating unit is running, the heat collection unit 1 collects and stores heat from the air and transfers the stored heat to the heat exchange unit 3. At the same time, the heat storage unit 2 transfers its stored heat supply medium to the heat exchange unit 3. The heat exchange unit 3 transfers the heat from the air to the heat supply medium to preheat it. After preheating, the heat exchange unit 3 transfers the heat-absorbing heat supply medium to the direct heating unit 4. At this time, the control unit 5 is activated so that the direct heating unit 4 uses the corresponding operating parameters to heat the heat supply medium and, when the temperature of the heat supply medium reaches the preset value, it is sent to the output unit 6 to complete the heating of the heat supply medium.

[0049] Those skilled in the art will understand that the direct heat generator described in this invention can be used for building heating, hot water production, industrial heating, and energy reuse of high-temperature industrial waste gas, as long as the direct heat generator can achieve its specified working state.

[0050] Please continue reading. Figure 1As shown, the heat collection unit 1 of this utility model embodiment includes a heat collection device 11 and a heat storage device 12. The heat collection device 11 is used to collect heat from the air, and the heat storage device 12 is connected to the heat collection device 11 to store the heat collected by the heat collection device 11.

[0051] Specifically, the heat collection device 11 described in this embodiment is a tube sheet type heat collection device with a black chrome electroplated coating on its surface. It is understood that the heat collection device 11 can absorb not only heat from the air but also energy from the sun; of course, the shape and size of the heat collection device 11 are not specifically limited in this embodiment, as long as the heat collection device can collect the specified amount of heat.

[0052] Specifically, a heat exchange medium is installed inside the heat storage device 12 to store the heat collected by the heat collection device 11. It is understood that the connection method between the heat storage device 12 and the heat collection device 11 is not specifically limited in this embodiment, as long as the heat collection device 11 can transfer heat to the heat storage device 12. Of course, the type of heat exchange medium is also not specifically limited in this embodiment, as long as it can store the heat collected by the heat collection device 11.

[0053] Please see Figure 2 As shown, this is a structural schematic diagram of the heat exchange unit 3 according to an embodiment of the present invention. The heat exchange unit 3 according to the embodiment of the present invention further includes a plurality of microchannel plates 31 arranged in parallel to transport the heat supply medium and a heat exchange plate 32 arranged between two adjacent microchannel plates to transport the heat exchange medium. The two ends of the microchannel plate 31 are respectively connected to the heat supply storage unit 2 and the direct heating unit 4, for receiving and transporting the heat supply medium output by the heat supply storage unit 2, and for transporting the heat supply medium after heat exchange to the direct heating unit 4. The two ends of the heat exchange plate 32 are both connected to the heat storage device 12, for receiving and transporting the heat exchange medium output by the heat storage device 12, and for returning the heat exchange medium after heat exchange to the heat storage device 12.

[0054] When the heat exchange unit 3 is running, the heat supply and storage unit 2 delivers the heat supply medium to the microchannel plate 31, and the heat storage device 12 delivers the heat exchange medium containing heat to the heat exchange plate 32. For a heat exchange plate group consisting of a single adjacent microchannel plate 31 and heat exchange plate 32, the heat supply medium in the microchannel plate 31 and the heat exchange medium in the heat exchange plate 32 flow in opposite directions and exchange heat during the flow. After the heat supply medium and the heat exchange medium flow through each heat exchange plate group, the heat supply medium completes the absorption of heat in the heat exchange medium. At this time, the heat exchange unit 3 completes the preheating of the heat supply medium. The heat exchange unit 3 delivers the heat supply medium to the direct heating unit 4 so that the direct heating unit 4 heats the heat supply medium. At the same time, the heat exchange unit delivers the heat exchange medium that has completed the heat exchange back to the heat storage device 12 so that the heat exchange medium reabsorbs the heat collected by the heat collection device 11 in the heat storage device 12.

[0055] It is understood that this embodiment does not impose a specific limit on the number of heat exchange plate groups, as long as the heat exchange plate groups can enable the heating medium and the heat exchange medium to complete the heat exchange.

[0056] Please see Figure 3 The diagram shows a side cross-sectional view of a single microchannel plate according to an embodiment of the present invention. A single microchannel plate 31 according to this embodiment includes a heating inlet pipe 311, a plurality of flat tubes 312, and a heating outlet pipe 313. The heating inlet pipe 311 is located at one end of the microchannel plate 31 to receive the heating medium. Each of the flat tubes 312 is arranged in parallel within the microchannel plate 31, and the inlet end of each flat tube 312 is connected to the heating inlet pipe 311, so that the received heating medium moves in a laminar flow manner. The heating outlet pipe 313 is located at the end of the microchannel plate 31 away from the heating inlet pipe 311, and the heating outlet pipe 313 is connected to the outlet end of each flat tube 312, so that the heat-exchanged heating medium output from each flat tube 312 is output from the microchannel plate 31.

[0057] When the heat exchange unit 3 is running, the heating medium enters a single microchannel plate 31 through the heating inlet pipe 311. At this time, the heating medium flows into each of the flat tubes 312 and moves in a laminar flow manner. The heating medium and the heat exchange medium in the heat exchange plate 32 adjacent to the microchannel plate 31 exchange heat. When the heating medium in each flat tube 312 completes a single heat exchange, it converges in the heating outlet pipe 313 and flows into the downstream microchannel plate 31 for the next heat exchange.

[0058] Specifically, the equivalent diameter of the channel of each of the flat tubes is 10-1000 μm.

[0059] It is understood that this embodiment does not limit the number of flat tubes 312 or the size of each flat tube 312, as long as the heating medium in each flat tube 312 has sufficient heat exchange area with the heat exchange medium.

[0060] Please see Figure 4 As shown, it is a structural schematic diagram of multiple microchannel plates in an embodiment of the present invention; for a single microchannel plate 31 in an embodiment of the present invention, the heating liquid inlet pipe 311 in the microchannel plate 31 is connected to the heating liquid outlet pipe 313 in the microchannel plate 31 located upstream thereto, and the heating liquid outlet pipe 313 in the microchannel plate 31 is connected to the heating liquid inlet pipe 311 in the microchannel plate 31 located downstream thereto.

[0061] Specifically, the heating inlet pipe 311 of the microchannel plate 31 located at the uppermost end is connected to the heating storage unit 2 to transport the heating medium into the microchannel plate 31; the heating outlet pipe 313 of the microchannel plate 31 located at the lowermost end is connected to the direct heating unit 4 to output the heating medium after heat exchange to the direct heating unit 4.

[0062] Please see Figure 5 The diagram shows a side cross-sectional view of a single heat exchange plate 32 according to an embodiment of the present invention. The heat exchange plate 32 in this embodiment includes a heat exchange inlet pipe 321, a heat exchange channel 322, and a heat exchange outlet pipe 323. The heat exchange inlet pipe 321 is located at one end of the heat exchange plate 32 to receive the heat exchange medium. The heat exchange channel 322 is located within the heat exchange plate 32, and its inlet end is connected to the heat exchange inlet pipe 321 to transport the received heat exchange medium. The heat exchange outlet pipe 323 is located at the end of the heat exchange plate 32 away from the heat exchange inlet pipe 321, and its outlet end is connected to the outlet end of the heat exchange channel 322 to discharge the completed heat exchange medium from the heat exchange channel 322 to the heat exchange plate 32.

[0063] When the heat exchange unit 3 is running, the heat exchange medium enters a single heat exchange plate 32 through the heat exchange inlet pipe 321. At this time, the heat exchange medium flows into the heat exchange channel 322 and moves within the heat exchange channel 322. At this time, the heat exchange medium and the heating medium in the microchannel plate 31 adjacent to the heat exchange plate 32 exchange heat. When the heat exchange medium in the heat exchange channel 322 completes a single heat exchange, it gathers in the heat exchange outlet pipe 323 and flows into the downstream heat exchange plate 32 for the next heat exchange.

[0064] It is understood that this embodiment does not limit the size of the heat exchange channel 322, as long as the heat exchange medium in the heat exchange channel 322 and the heating medium have sufficient heat exchange area.

[0065] Please see Figure 6 As shown, it is a structural schematic diagram of the heat exchange plate according to an embodiment of the present utility model; for a single heat exchange plate 32 in this embodiment of the present utility model, the heat exchange liquid inlet pipe 321 in the heat exchange plate 32 is connected to the heat exchange liquid outlet pipe 323 in the heat exchange plate 32 located upstream thereto, and the heat exchange liquid outlet pipe 323 in the heat exchange plate 32 is connected to the heat exchange liquid inlet pipe 321 in the heat exchange plate 32 located downstream thereto.

[0066] Specifically, the heat exchange inlet pipe 321 of the upstream heat exchange plate 32 and the heat exchange outlet pipe 323 of the downstream heat exchange plate 32 are both connected to the heat storage device 12 to transport the heat exchange medium into the heat exchange plate 32 and to return the heat exchange medium after heat exchange to the heat storage device 12.

[0067] The technical solution of this utility model has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

[0068] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A microchannel heat exchanger direct-fired heater characterized by, The application relates to a heat collecting and storing device, which comprises: a heat collecting unit for collecting and storing heat in air; a heat supply storing unit for storing a heat supply medium to be exchanged; an exchange unit connected with the heat collecting unit and the storing unit respectively, for preheating the heat supply medium by heat exchange, which comprises a plurality of micro-channel plates arranged in parallel for conveying the heat supply medium and a plurality of exchange plates arranged between adjacent micro-channel plates for conveying an exchange medium; a direct heating unit connected with the exchange unit, for heating the preheated heat supply medium output by the exchange unit; a control unit connected with the direct heating unit, for controlling the operation parameters of the direct heating unit; and an output unit connected with the direct heating unit, for outputting the heat supply medium heated by the direct heating unit.

2. The micro-channel heat exchanger direct-fired machine of claim 1, wherein, The heat collecting unit comprises: a heat collecting device for collecting heat in air; a heat storing device connected with the heat collecting device, for receiving and storing the heat collected by the heat collecting device.

3. The micro-channel heat exchanger direct-fired machine of claim 2, wherein, The heat storing device is loaded with the exchange medium, for absorbing the heat collected by the heat collecting device.

4. The micro-channel heat exchanger direct-fired machine of claim 3, wherein, For a single micro-channel plate, it comprises: a heat supply inlet pipe arranged at one end of the micro-channel plate, for receiving the heat supply medium; a plurality of flat tubes arranged in parallel in the micro-channel plate, and the inlet end of each flat tube is connected with the heat supply inlet pipe, for moving the received heat supply medium in a laminar flow manner; a heat supply outlet pipe arranged at the end of the micro-channel plate away from the heat supply inlet pipe, and the outlet end of each flat tube is connected with the heat supply outlet pipe, for outputting the heat supply medium exchanged by each flat tube from the micro-channel plate.

5. The micro-channel heat exchanger direct-fired machine of claim 4, wherein, For a single micro-channel plate, the heat supply inlet pipe in the micro-channel plate is connected with the heat supply outlet pipe in the micro-channel plate upstream of the micro-channel plate, and the heat supply outlet pipe in the micro-channel plate is connected with the heat supply inlet pipe in the micro-channel plate downstream of the micro-channel plate.

6. The micro-channel heat exchanger direct-fired machine of claim 5, wherein, The heat supply inlet pipe of the micro-channel plate located at the most upstream is connected with the heat supply storing unit, for conveying the heat supply medium into the micro-channel plate; and the heat supply outlet pipe of the micro-channel plate located at the most downstream is connected with the direct heating unit, for outputting the heat supply medium exchanged from the direct heating unit.

7. The micro-channel heat exchanger direct-fired machine of any of claims 4-6, wherein, The channel equivalent diameter of each flat tube is 10-1000 mu m.

8. The micro-channel heat exchanger direct-fired machine of claim 3, wherein, For a single exchange plate, it comprises: an exchange inlet pipe arranged at one end of the exchange plate, for receiving the exchange medium; an exchange flow channel arranged inside the exchange plate, and the inlet end of the exchange flow channel is connected with the exchange inlet pipe, for conveying the exchange medium received by the exchange inlet pipe; an exchange outlet pipe arranged at the end of the exchange plate away from the exchange inlet pipe, and the outlet end of the exchange flow channel is connected with the exchange outlet pipe, for outputting the exchange medium exchanged by the exchange flow channel from the exchange plate.

9. The micro-channel heat exchanger direct-fired machine of claim 8, wherein, For a single exchange plate, the exchange inlet pipe in the exchange plate is connected with the exchange outlet pipe in the exchange plate upstream of the exchange plate, and the exchange outlet pipe in the exchange plate is connected with the exchange inlet pipe in the exchange plate downstream of the exchange plate.

10. The micro-channel heat exchanger direct-fired machine of claim 9, wherein, The heat exchange inlet pipe of the heat exchange plate at the most upstream is connected with the heat storage device to deliver the heat exchange medium into the heat exchange plate; the heat exchange outlet pipe of the heat exchange plate at the most downstream is connected with the heat storage device to return the heat exchange medium after heat exchange to the heat storage device.

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