Distributed energy station system based on waste heat gradient utilization

Abstract

The invention belongs to the field of energy station waste heat utilization, and particularly relates to a distributed energy station system based on waste heat gradient utilization. The invention provides a distributed energy station system based on waste heat gradient utilization. The distributed energy station system comprises a waste heat boiler, a flue gas heat exchanger, a cold water inlet pipeline, a first three-way valve, a first temperature control valve, a first pump, a first water heat exchanger, a hot water discharge pipeline, a second temperature control valve, a second pump, a second water heat exchanger, a second three-way valve and a used water inlet pipeline. And a third three-way valve and a water discharge pipeline. According to the distributed energy station system based on waste heat gradient utilization, graded collection can be conducted according to different heat, the collected different temperatures are applied to different scenes, the graded heat collection structure is reasonably utilized to achieve step-by-step collection of water, the heat utilization efficiency is improved to the maximum extent, and the energy consumption is reduced. And targeted conveying can be carried out according to different heat application scenes.

Description

Technical Field

[0001] The present invention belongs to the field of waste heat utilization of energy stations, and in particular relates to a distributed energy station system based on cascade utilization of waste heat. Background Art

[0002] In recent years, the utilization of waste heat from distributed energy stations has received increasing attention, and how to more efficiently utilize the waste heat from distributed energy stations has become a focus in this field.

[0003] Existing equipment and technologies simply collect and convert waste heat, and are not very targeted during the collection and utilization processes, resulting in a lot of waste. For example, the temperature of flue gas emitted during boiler operation actually changes.

[0004] When the boiler is running, it is necessary to maintain an appropriate excess air coefficient. If the excess coefficient is too large, the flue gas volume will increase and the furnace outlet temperature will rise. When the load changes, the amount of fuel and air entering the furnace will be appropriately adjusted, and the combustion conditions will be changed accordingly. The properties of the fuel also have a certain impact on the exhaust gas temperature.

[0005] For example, the moisture in the coal turns into water vapor, which increases the amount of flue gas, and thus the heat loss of flue gas will increase.

[0006] For another example, if the ash content in the coal increases, the ash and coking on the heating surface will be serious. The slagging in the furnace will affect the water circulation, causing the furnace outlet temperature to rise, and the ash accumulation on the rear heating surface will significantly increase the exhaust gas temperature. At the same time, the calorific value of coal with high ash content is low, and the amount of fuel consumed under the same load conditions increases, resulting in an increase in the flue gas volume and flow rate, leading to an increase in the exhaust gas temperature and exhaust volume, etc.

[0007] The existing waste heat collection equipment does not carry out differentiated collection and utilization of flue gases of different temperatures emitted by boilers.

[0008] In addition, when collecting and utilizing waste heat, a single heat exchange device is used, which has low exchange efficiency and the heat after exchange cannot be applied in a targeted manner to different scenarios. Summary of the Invention

[0009] The present invention provides a distributed energy station system based on cascade utilization of waste heat, which can effectively solve the problems in the background technology.

[0010] The present invention provides a distributed energy station system based on waste heat cascade utilization, comprising

[0011] Waste heat boiler for discharging flue gas to be collected;

[0012] Flue gas heat exchanger using flue gas discharged from waste heat boiler as driving heat source;

[0013] A cold water inlet pipe for delivering cold water to the flue gas heat exchanger;

[0014] A valve port is connected to a first three-way valve of a hot water outlet of a flue gas heat exchanger;

[0015] a first temperature control valve having one valve port connected to another valve port of the first three-way valve;

[0016] a first pump having an input port connected to another valve port of the first temperature control valve;

[0017] a first water heat exchanger in communication with the first pump output port;

[0018] a hot water discharge pipe for discharging hot water from the first water heat exchanger;

[0019] a second temperature-controlled valve having one valve port connected to the other valve port of the first three-way valve, wherein the opening triggering temperature of the second temperature-controlled valve is higher than that of the first temperature-controlled valve;

[0020] a second pump having an input port connected to another valve port of the second temperature control valve;

[0021] a second water heat exchanger in communication with the second pump output port;

[0022] a second three-way valve having one valve port connected to a hot water outlet of a second water heat exchanger, another valve port of the second three-way valve being used to discharge hot water from the second water heat exchanger, and another valve port of the second three-way valve being connected to another valve port of the first three-way valve;

[0023] a water inlet pipe for delivering water to the first water heat exchanger;

[0024] a third three-way valve having one valve port connected to the water outlet of the first water heat exchanger, another valve port of the third three-way valve being used for discharging water from the first water heat exchanger, and another valve port of the third three-way valve being connected to the water inlet of the second water heat exchanger; and

[0025] A water discharge pipe is used to discharge water from the second water heat exchanger.

[0026] As a further optimization of the present invention, it also includes

[0027] A fourth three-way valve having a valve port connected to a smoke outlet of the flue gas heat exchanger;

[0028] a third temperature control valve having one valve port connected to another valve port of the fourth three-way valve;

[0029] A third pump having an input port connected to another valve port of the third temperature control valve;

[0030] a first air heat exchanger in communication with an output port of the third pump;

[0031] a hot gas discharge duct for discharging hot gas from the first air heat exchanger;

[0032] a fourth temperature-controlled valve having one valve port connected to another valve port of the fourth three-way valve, wherein the opening triggering temperature of the fourth temperature-controlled valve is higher than that of the third temperature-controlled valve;

[0033] a fourth pump having an input port connected to another valve port of a fourth temperature control valve;

[0034] a second air heat exchanger in communication with the fourth pump output port;

[0035] a fifth three-way valve having one valve port connected to the hot gas exhaust port of the second air heat exchanger, another valve port of the fifth three-way valve being used to exhaust hot gas from the second air heat exchanger, and another valve port of the fifth three-way valve being connected to another valve port of the fourth three-way valve;

[0036] A sixth three-way valve having one valve port connected to the water discharge port of the second water heat exchanger, another valve port of the sixth three-way valve being used for discharging water from the second water heat exchanger, and another valve port of the sixth three-way valve being connected to the water inlet of the first air heat exchanger;

[0037] a seventh three-way valve having one valve port connected to the water outlet of the first air heat exchanger, another valve port of the seventh three-way valve being used for discharging water from the first air heat exchanger, and another valve port of the seventh three-way valve being connected to the water inlet of the second air heat exchanger; and

[0038] The water discharge pipe is used to discharge water from the second air heat exchanger.

[0039] As a further optimization of the present invention, it also includes

[0040] a fifth temperature-controlled valve having one valve port connected to another valve port of the first three-way valve, wherein the opening trigger temperature of the fifth temperature-controlled valve is higher than that of the second temperature-controlled valve;

[0041] A fifth pump having an input port connected to another valve port of a fifth temperature control valve;

[0042] a third water heat exchanger in communication with the fifth pump output;

[0043] a first four-way valve having one valve port connected to a hot water outlet of a third water heat exchanger, another valve port of the first four-way valve being used to discharge hot water from the third water heat exchanger, another valve port of the first four-way valve being connected to another valve port of the second three-way valve, and another valve port of the first four-way valve being connected to another valve port of the first three-way valve;

[0044] an eighth three-way valve having one valve port connected to the water discharge port of the second water heat exchanger, another valve port of the eighth three-way valve being used for discharging water from the second water heat exchanger, and yet another valve port of the eighth three-way valve being connected to the water inlet of the third water heat exchanger; and

[0045] The water outlet of the third water heat exchanger is communicated with one valve port of the sixth three-way valve, and the other valve port of the sixth three-way valve is used for discharging water from the third water heat exchanger.

[0046] As a further optimization of the present invention, it also includes.

[0047] a sixth temperature-controlled valve having one valve port connected to another valve port of the fourth three-way valve, wherein the opening trigger temperature of the sixth temperature-controlled valve is higher than that of the fourth temperature-controlled valve;

[0048] a sixth pump having an input port connected to another valve port of a sixth temperature control valve;

[0049] a third air heat exchanger in communication with an output port of the sixth pump;

[0050] a second four-way valve having one valve port connected to a hot gas exhaust port of a third air heat exchanger, another valve port of the second four-way valve being used to exhaust hot gas from the third air heat exchanger, another valve port of the second four-way valve being connected to another valve port of the fifth three-way valve, and another valve port of the second four-way valve being connected to another valve port of the fourth three-way valve;

[0051] a ninth three-way valve having one valve port connected to the water outlet of the second air heat exchanger, another valve port of the ninth three-way valve being used for discharging water from the second air heat exchanger, and another valve port of the ninth three-way valve being connected to the water inlet of the third air heat exchanger; and

[0052] The water discharge pipe is used to discharge water from the third air heat exchanger.

[0053] As a further optimization of the present invention, it also includes

[0054] A first controller for controlling the linkage between the first temperature control valve and the first pump; and

[0055] A second controller controls the linkage between the second temperature control valve and the second pump.

[0056] As a further optimization of the present invention, it also includes

[0057] a third controller for controlling the linkage between the third temperature control valve and the third pump; and

[0058] a fourth controller for controlling the linkage between the fourth temperature control valve and the fourth pump.

[0059] As a further optimization of the present invention, it also includes

[0060] a fifth controller for controlling the linkage between the fifth temperature control valve and the fifth pump.

[0061] As a further optimization of the present invention, it also includes

[0062] a sixth controller for controlling the linkage between the sixth temperature control valve and the sixth pump.

[0063] As a further optimization of the present invention, the waste heat boiler adopts a supplementary combustion type waste heat boiler.

[0064] As a further optimization of the present invention, it also includes a first insulation tank and a second insulation tank for collecting water discharged from the first water heat exchanger and the second water heat exchanger respectively.

[0065] The present invention provides a distributed energy station system based on the cascade utilization of waste heat, which can collect heat in different levels according to different heat, and the different temperatures collected can be applied to different scenarios. The graded heat collection structure can then be reasonably used to gradually collect water for use, thereby maximizing the heat utilization efficiency and providing targeted delivery for different heat application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 This is a schematic diagram of the system structure of Example 1;

[0067] Figure 2 This is a schematic diagram of the system structure of Example 2;

[0068] Figure 3 This is a schematic diagram of the system structure of Example 3;

[0069] Figure 4 This is a schematic diagram of the system structure of Example 4;

[0070] in

[0071] 1. Waste heat boiler

[0072] 2. Flue gas heat exchanger

[0073] 3. Cold water inlet pipe

[0074] 4. First three-way valve

[0075] 5. The first temperature control valve

[0076] 6. First pump

[0077] 7. First water heat exchanger

[0078] 8. Hot water discharge pipe

[0079] 9. Second temperature control valve

[0080] 10. Second pump

[0081] 11. Second water heat exchanger

[0082] 12. Second three-way valve

[0083] 13. Third three-way valve

[0084] 14. Use water to drain the pipe

[0085] 15. Fourth three-way valve

[0086] 16. The third temperature control valve

[0087] 17. The third pump

[0088] 18. First air heat exchanger

[0089] 19. Hot gas exhaust pipe

[0090] 20. Fourth temperature control valve

[0091] 21. Fourth pump

[0092] 22. Second air heat exchanger

[0093] 23. Fifth three-way valve

[0094] 24. Sixth three-way valve

[0095] 25. Seventh three-way valve

[0096] 26. Fifth temperature control valve

[0097] 27. Fifth Pump

[0098] 28. The third water heat exchanger

[0099] 29. First four-way valve

[0100] 30. Eighth three-way valve

[0101] 31. Sixth temperature control valve

[0102] 32. Sixth Pump

[0103] 33. Third air heat exchanger

[0104] 34. Second four-way valve

[0105] 35. Ninth three-way valve

[0106] 36. First Controller

[0107] 37. Second Controller

[0108] 38. Third Controller

[0109] 39. Fourth Controller

[0110] 40. Fifth Controller

[0111] 41. Sixth Controller

[0112] 42. Water inlet pipe DETAILED DESCRIPTION

[0113] Example 1

[0114] like Figure 1 As shown, this embodiment includes a waste heat boiler 1, a flue gas heat exchanger 2, a cold water inlet pipe 3, a first three-way valve 4, a first temperature control valve 5, a first pump 6, a first water heat exchanger 7, a hot water discharge pipe 8, a second temperature control valve 9, a second pump 10, a second water heat exchanger 11, a second three-way valve 12, a water inlet pipe 42, a third three-way valve 13 and a water discharge pipe 14.

[0115] The flue gas with heat discharged from the waste heat boiler 1 enters the flue gas heat exchanger 2 and serves as a driving heat source for the flue gas heat exchanger 2. The flue gas heat exchanger 2 can also be replaced by a flue gas type lithium bromide unit.

[0116] The cold water enters the flue gas heat exchanger 2 through the cold water inlet pipe 3, and the flue gas heat exchanger 2 heats the cold water and then outputs it.

[0117] One valve port of the first three-way valve 4 is connected to a hot water outlet of the flue gas heat exchanger 2 , and the other valve port of the first three-way valve 4 is connected to a valve port of the first temperature control valve 5 .

[0118] The other valve port of the first temperature control valve 5 is connected to the input port of the first pump 6 , and the output port of the first pump 6 is connected to the first water heat exchanger 7 . The first water heat exchanger 7 is provided with a hot water discharge pipe 8 .

[0119] One valve port of the second temperature control valve 9 is also connected to the other valve port of the first three-way valve 4 , and the other valve port of the second temperature control valve 9 is connected to the input port of the second pump 10 , and the output port of the second pump 10 is connected to the second water heat exchanger 11 .

[0120] One valve port of the second three-way valve 12 is connected to the hot water outlet of the second water heat exchanger 11, another valve port of the second three-way valve 12 is used to discharge hot water from the second water heat exchanger 11, and another valve port of the second three-way valve 12 is connected to another valve port of the first three-way valve 4.

[0121] The water inlet pipe 42 is used to deliver water to the first water heat exchanger 7 .

[0122] One valve port of the third three-way valve 13 is connected to the water outlet of the first water heat exchanger 7, another valve port of the third three-way valve 13 is used to discharge water from the first water heat exchanger 7, and another valve port of the third three-way valve 13 is connected to the water inlet of the second water heat exchanger 11.

[0123] The water discharge pipe 14 is connected to the second water heat exchanger 11 for water discharge.

[0124] In this embodiment, after the hot water from the flue gas heat exchanger 2 passes through the first three-way valve 4, it can pass through the first temperature control valve 5 and the second temperature control valve 9 at the same time. The opening trigger temperature of the second temperature control valve 9 is set higher than that of the first temperature control valve 5. When the water temperature is within the threshold of the first temperature control valve 5, the first temperature control valve 5 opens, the second temperature control valve 9 closes, and the first pump 6 delivers the hot water to the first water heat exchanger 7.

[0125] The first water heat exchanger 7 heats the water and discharges the hot waste water from the hot water discharge pipe 8 .

[0126] When the water temperature is within the threshold of the second temperature control valve 9 , the second temperature control valve 9 is opened, the first temperature control valve 5 is closed, and the second pump 10 delivers hot water to the second water heat exchanger 11 .

[0127] The second water heat exchanger 11 heats the water and discharges the hot waste water from another valve port of the second three-way valve 12, or the hot waste water can be further recycled.

[0128] After the temperature of the hot waste water after being used in the second water heat exchanger 11 is reduced to within the threshold value of the first temperature control valve 5, the hot waste water used by the second water heat exchanger 11 can be transported to the first water heat exchanger 7 for secondary utilization through another valve port of the second three-way valve 12 and another valve port of the first three-way valve 4, thereby greatly improving the utilization rate of thermal energy.

[0129] In this embodiment, water enters the first water heat exchanger 7 through the water inlet pipe 42 for heating. The heated water can be discharged to the application scene through the other valve port of the third three-way valve 13 for use. The water can also enter the second water heat exchanger 11 through another valve port of the third three-way valve 13 for further heating. After heating, the water is discharged from the water outlet pipe 14 connected to the second water heat exchanger 11 for use in the application scene.

[0130] In this embodiment, the water is heated in stages, which can improve the efficiency of heat energy utilization. Moreover, the heated water at each stage can be used in different scenarios, which is flexible. At the same time, the hot wastewater in this embodiment is reversely utilized in stages, maximizing the utilization rate of heat energy.

[0131] Preferably, in this embodiment, a first controller 36 and a second controller 37 are further provided.

[0132] The first controller 36 controls the first temperature control valve 5 and the first pump 6 to operate in conjunction with each other, that is, when the first temperature control valve 5 detects that the hot water temperature meets the threshold value set by itself, the first temperature control valve 5 opens and the first pump 6 starts working; when the first temperature control valve 5 detects that the hot water temperature does not meet the threshold value set by itself, the first pump 6 stops working and the first temperature control valve 5 closes.

[0133] Similarly, the second controller 37 controls the second temperature control valve 9 and the second pump 10 to operate in conjunction, that is, when the second temperature control valve 9 detects that the hot water temperature meets the threshold requirement set by itself, the second temperature control valve 9 opens and the second pump 10 starts working; when the second temperature control valve 9 detects that the hot water temperature does not meet the threshold requirement set by itself, the second pump 10 stops working and the second temperature control valve 9 closes.

[0134] Furthermore, in this embodiment, the waste heat boiler 1 is a supplementary combustion type waste heat boiler.

[0135] Furthermore, this embodiment further includes a first heat preservation tank and a second heat preservation tank. Hot water discharged from the first water heat exchanger 7 and the second water heat exchanger 11 can be stored in the first heat preservation tank and the second heat preservation tank respectively and used slowly.

[0136] Example 2

[0137] like Figure 2 As shown, this embodiment is based on Example 1 and additionally includes a fourth three-way valve 15, a third temperature-controlled valve 16, a third pump 17, a first air heat exchanger 18, a hot gas exhaust pipe 19, a fourth temperature-controlled valve 20, a fourth pump 21, a second air heat exchanger 22, a fifth three-way valve 23, a sixth three-way valve 24 and a seventh three-way valve 25.

[0138] One valve port of the fourth three-way valve 15 is connected to the smoke outlet of the flue gas heat exchanger 2 , and the other valve port of the fourth three-way valve 15 is connected to one valve port of the third temperature control valve 16 .

[0139] Another valve port of the third temperature control valve 16 is connected to an input port of a third pump 17 , and an output port of the third pump 17 is connected to the first air heat exchanger 18 .

[0140] The hot gas exhaust pipe 19 is connected to the first air heat exchanger 18 and is used to discharge the hot exhaust gas of the first air heat exchanger 18.

[0141] Another valve port of the fourth three-way valve 15 is also connected to a valve port of the fourth temperature control valve 20 .

[0142] Another valve port of the fourth temperature control valve 20 is connected to an input port of a fourth pump 21 , and an output port of the fourth pump 21 is connected to the second air heat exchanger 22 .

[0143] One valve port of the fifth three-way valve 23 is connected to the hot gas exhaust port of the second air heat exchanger 22, another valve port of the fifth three-way valve 23 is used to discharge hot exhaust gas from the second air heat exchanger 22, and another valve port of the fifth three-way valve 23 is connected to another valve port of the fourth three-way valve 15.

[0144] One valve port of the sixth three-way valve 24 is connected to the water discharge outlet of the second water heat exchanger 11, another valve port of the sixth three-way valve 24 is used to discharge water from the second water heat exchanger 11, and another valve port of the sixth three-way valve 24 is connected to the water inlet of the first air heat exchanger 18.

[0145] One valve port of the seventh three-way valve 25 is connected to the water outlet of the first air heat exchanger 18, another valve port of the seventh three-way valve 25 is used to discharge water from the first air heat exchanger 18, and another valve port of the seventh three-way valve 25 is connected to the water inlet of the second air heat exchanger 22.

[0146] The water discharge pipe 14 is in communication with the water outlet of the second air heat exchanger 22 .

[0147] In this embodiment, after the hot gas from the flue gas heat exchanger 2 passes through the fourth three-way valve 15, it can pass through the third temperature-controlled valve 16 and the fourth temperature-controlled valve 20 at the same time. The opening trigger temperature of the fourth temperature-controlled valve 20 is set to be higher than that of the third temperature-controlled valve 16. When the hot gas temperature is within the threshold of the third temperature-controlled valve 16, the third temperature-controlled valve 16 opens, the fourth temperature-controlled valve 20 closes, and the third pump 17 delivers the hot gas to the first air heat exchanger 18.

[0148] The first air heat exchanger 18 heats the water and discharges the hot exhaust gas from the hot gas discharge pipe 19 .

[0149] When the hot gas temperature is within the threshold of the fourth temperature control valve 20 , the fourth temperature control valve 20 is opened, the third temperature control valve 16 is closed, and the fourth pump 21 delivers the hot gas to the second air heat exchanger 22 .

[0150] The second air heat exchanger 22 heats the water and discharges the hot exhaust gas from another valve port of the fifth three-way valve 23, and can also further recycle the hot exhaust gas.

[0151] After the temperature of the hot exhaust gas after being used in the second air heat exchanger 22 is reduced to within the threshold value of the third temperature control valve 16, the hot exhaust gas used by the second air heat exchanger 22 can be transported to the first air heat exchanger 18 for secondary utilization through another valve port of the fifth three-way valve 23 and another valve port of the fourth three-way valve 15, thereby greatly improving the utilization rate of thermal energy.

[0152] After passing through the second water heat exchanger 11, the water enters the first air heat exchanger 18 through another valve port of the sixth three-way valve 24 for further heating. The heated water can be discharged to the application scene through another valve port of the seventh three-way valve 25 for use, or it can further enter the second air heat exchanger 22 through another valve port of the seventh three-way valve 25 for further heating. After heating, it is discharged from the water discharge pipe 14 to the application scene for use.

[0153] Preferably, in this embodiment, a third controller 38 and a fourth controller 39 are further provided.

[0154] The third controller 38 controls the third temperature control valve 16 and the third pump 17 to operate in conjunction with each other. That is, when the third temperature control valve 16 detects that the hot water temperature meets the threshold value set by itself, the third temperature control valve 16 opens and the third pump 17 starts working; when the third temperature control valve 16 detects that the hot water temperature does not meet the threshold value set by itself, the third pump 17 stops working and the third temperature control valve 16 closes.

[0155] Similarly, the fourth controller 39 controls the fourth temperature-controlled valve 20 and the fourth pump 21 to operate in conjunction, that is, when the fourth temperature-controlled valve 20 detects that the hot water temperature meets the threshold requirement set by itself, the fourth temperature-controlled valve 20 opens and the fourth pump 21 starts working; when the fourth temperature-controlled valve 20 detects that the hot water temperature does not meet the threshold requirement set by itself, the fourth pump 21 stops working and the fourth temperature-controlled valve 20 closes.

[0156] Example 3

[0157] like Figure 3 As shown, this embodiment is based on the embodiment 2 and is further provided with a fifth temperature control valve 26 , a fifth pump 27 , a third water heat exchanger 28 , a first four-way valve 29 and an eighth three-way valve 30 .

[0158] One valve port of the fifth temperature control valve 26 is connected to the other valve port of the first three-way valve 4 , and the other valve port of the fifth temperature control valve 26 is connected to the input port of the fifth pump 27 . The opening trigger temperature of the fifth temperature control valve 26 is higher than that of the second temperature control valve 9 .

[0159] The output port of the fifth pump 27 is communicated with the third water heat exchanger 28 .

[0160] One valve port of the first four-way valve 29 is connected to the hot water discharge port of the third water heat exchanger 28, another valve port of the first four-way valve 29 is used to discharge hot water from the third water heat exchanger 28, another valve port of the first four-way valve 29 is connected to another valve port of the second three-way valve 12, and another valve port of the first four-way valve 29 is connected to another valve port of the first three-way valve 4.

[0161] One valve port of the eighth three-way valve 30 is connected to the water discharge port of the second water heat exchanger 11, another valve port of the eighth three-way valve 30 is used for water discharge of the second water heat exchanger 11, and another valve port of the eighth three-way valve 30 is connected to the water inlet of the third water heat exchanger 28.

[0162] One valve port of the sixth three-way valve 24 is connected to the water outlet of the third water heat exchanger 28, and the other valve port of the third six-way valve is used to discharge the water of the third water heat exchanger 28 to the application scene.

[0163] Compared with embodiment 2, this embodiment provides a fifth temperature control valve 26 to achieve more levels of heat utilization.

[0164] After heating the water, the third water heat exchanger 28 can discharge the hot waste water from another valve port of the first four-way valve 29. Alternatively, when the temperature of the hot waste water is still at the threshold set by the second temperature control valve 9, the hot waste water passes through another valve port of the first four-way valve 29 and another valve port of the first three-way valve 4, and then enters the second water heat exchanger 11 through the second temperature control valve 9 for the next level of heat utilization.

[0165] Similarly, the water is heated after entering the second water heat exchanger 11. The heated water can be discharged to the application scenario through another valve port of the eighth three-way valve 30 for use. It can also further enter the third water heat exchanger 28 through another valve port of the eighth three-way valve 30 for further heating. After heating, it can be discharged from another valve port of the sixth three-way valve 24 or enter the first air heat exchanger 18 from another valve port of the sixth three-way valve 24 for further heating.

[0166] Preferably, in this embodiment, a fifth controller 40 and a fifth controller 40 are further provided.

[0167] The fifth controller 40 controls the fifth temperature-controlled valve 26 and the fifth pump 27 to operate in linkage, that is, when the fifth temperature-controlled valve 26 detects that the hot water temperature meets the threshold value set by itself, the fifth temperature-controlled valve 26 opens and the fifth pump 27 starts working; when the fifth temperature-controlled valve 26 detects that the hot water temperature does not meet the threshold value set by itself, the fifth pump 27 stops working and the fifth temperature-controlled valve 26 closes.

[0168] Example 4

[0169] like Figure 4 As shown, this embodiment is based on the embodiment 3 and is further provided with a sixth temperature control valve 31 , a sixth pump 32 , a third air heat exchanger 33 , a second four-way valve 34 and a ninth three-way valve 35 .

[0170] One valve port of the sixth temperature control valve 31 is connected to the other valve port of the fourth three-way valve 15 , and an opening triggering temperature of the sixth temperature control valve 31 is higher than that of the fourth temperature control valve 20 .

[0171] An input port of the sixth pump 32 is communicated with another valve port of the sixth temperature control valve 31 , and an output port of the sixth pump 32 is communicated with the third air heat exchanger 33 .

[0172] One valve port of the second four-way valve 34 is connected to the hot gas exhaust port of the third air heat exchanger 33, another valve port of the second four-way valve 34 is used to discharge hot exhaust gas from the third air heat exchanger 33, another valve port of the second four-way valve 34 is connected to another valve port of the fifth three-way valve 23, and another valve port of the second four-way valve 34 is connected to another valve port of the fourth three-way valve 15.

[0173] One valve port of the ninth three-way valve 35 is connected to the water outlet of the second air heat exchanger 22, another valve port of the ninth three-way valve 35 is used to discharge water from the second air heat exchanger 22, and another valve port of the ninth three-way valve 35 is connected to the water inlet of the third air heat exchanger 33.

[0174] The water discharge pipe 14 is connected to the third air heat exchanger 33 for discharging hot water into the application scene.

[0175] Compared with embodiment 3, this embodiment provides a sixth temperature control valve 31 to achieve more levels of heat utilization.

[0176] After heating the water, the third air heat exchanger 33 can discharge the hot exhaust gas from another valve port of the second four-way valve 34. Alternatively, when the temperature of the hot exhaust gas is still at the threshold set by the fourth temperature control valve 20, the hot exhaust gas passes through another valve port of the second four-way valve 34 and another valve port of the fourth three-way valve 15, and then enters the second air heat exchanger 22 through the fourth temperature control valve 20 for the next level of heat utilization.

[0177] Similarly, the water enters the second air heat exchanger 22 and is heated. The heated water can be discharged to the application scene through another valve port of the ninth three-way valve 35 for use. It can also further enter the third air heat exchanger 33 through another valve port of the ninth three-way valve 35 for further heating. After heating, it can be discharged to the application scene from the water discharge pipe 14.

[0178] Preferably, in this embodiment, a sixth controller 41 and a sixth controller 41 are further provided.

[0179] The sixth controller 41 controls the sixth temperature-controlled valve 31 and the sixth pump 32 to operate in linkage, that is, when the sixth temperature-controlled valve 31 detects that the hot water temperature meets the threshold requirement set by itself, the sixth temperature-controlled valve 31 opens and the sixth pump 32 starts working; when the sixth temperature-controlled valve 31 detects that the hot water temperature does not meet the threshold requirement set by itself, the sixth pump 32 stops working and the sixth temperature-controlled valve 31 closes.

[0180] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A distributed energy station system based on cascade utilization of waste heat, characterized in that: include Waste heat boiler for discharging flue gas to be collected; Flue gas heat exchanger using flue gas discharged from waste heat boiler as driving heat source; A cold water inlet pipe for delivering cold water to the flue gas heat exchanger; A valve port is connected to a first three-way valve of a hot water outlet of a flue gas heat exchanger; a first temperature control valve having one valve port connected to another valve port of the first three-way valve; a first pump having an input port connected to another valve port of the first temperature control valve; a first water heat exchanger in communication with the first pump output port; a hot water discharge pipe for discharging hot water from the first water heat exchanger; a second temperature-controlled valve having one valve port connected to the other valve port of the first three-way valve, wherein the opening triggering temperature of the second temperature-controlled valve is higher than that of the first temperature-controlled valve; a second pump having an input port connected to another valve port of the second temperature control valve; a second water heat exchanger in communication with the second pump output port; a second three-way valve having one valve port connected to a hot water outlet of a second water heat exchanger, another valve port of the second three-way valve being used to discharge hot water from the second water heat exchanger, and another valve port of the second three-way valve being connected to another valve port of the first three-way valve; a water inlet pipe for delivering water to the first water heat exchanger; a third three-way valve having one valve port connected to the water outlet of the first water heat exchanger, another valve port of the third three-way valve being used for discharging water from the first water heat exchanger, and another valve port of the third three-way valve being connected to the water inlet of the second water heat exchanger; and A water discharge pipe is used to discharge water from the second water heat exchanger.

2. A distributed energy station system based on cascade utilization of waste heat according to claim 1, characterized in that: Also includes A fourth three-way valve having a valve port connected to a smoke outlet of the flue gas heat exchanger; a third temperature control valve having one valve port connected to another valve port of the fourth three-way valve; A third pump having an input port connected to another valve port of the third temperature control valve; a first air heat exchanger in communication with an output port of the third pump; a hot gas discharge duct for discharging hot gas from the first air heat exchanger; a fourth temperature-controlled valve having one valve port connected to another valve port of the fourth three-way valve, wherein the opening triggering temperature of the fourth temperature-controlled valve is higher than that of the third temperature-controlled valve; a fourth pump having an input port connected to another valve port of a fourth temperature control valve; a second air heat exchanger in communication with the fourth pump output port; a fifth three-way valve having one valve port connected to the hot gas exhaust port of the second air heat exchanger, another valve port of the fifth three-way valve being used to exhaust hot gas from the second air heat exchanger, and another valve port of the fifth three-way valve being connected to another valve port of the fourth three-way valve; A sixth three-way valve having one valve port connected to the water discharge port of the second water heat exchanger, another valve port of the sixth three-way valve being used for discharging water from the second water heat exchanger, and another valve port of the sixth three-way valve being connected to the water inlet of the first air heat exchanger; a seventh three-way valve having one valve port connected to the water outlet of the first air heat exchanger, another valve port of the seventh three-way valve being used for discharging water from the first air heat exchanger, and another valve port of the seventh three-way valve being connected to the water inlet of the second air heat exchanger; and The water discharge pipe is used to discharge water from the second air heat exchanger.

3. A distributed energy station system based on cascade utilization of waste heat according to claim 2, characterized in that: Also includes a fifth temperature-controlled valve having one valve port connected to another valve port of the first three-way valve, wherein the opening trigger temperature of the fifth temperature-controlled valve is higher than that of the second temperature-controlled valve; A fifth pump having an input port connected to another valve port of a fifth temperature control valve; a third water heat exchanger in communication with the fifth pump output; a first four-way valve having one valve port connected to a hot water outlet of a third water heat exchanger, another valve port of the first four-way valve being used to discharge hot water from the third water heat exchanger, another valve port of the first four-way valve being connected to another valve port of the second three-way valve, and another valve port of the first four-way valve being connected to another valve port of the first three-way valve; an eighth three-way valve having one valve port connected to the water discharge port of the second water heat exchanger, another valve port of the eighth three-way valve being used for discharging water from the second water heat exchanger, and another valve port of the eighth three-way valve being connected to the water inlet of the third water heat exchanger; as well as The water outlet of the third water heat exchanger is communicated with one valve port of the sixth three-way valve, and the other valve port of the sixth three-way valve is used for discharging water from the third water heat exchanger.

4. A distributed energy station system based on cascade utilization of waste heat according to claim 3, characterized in that: Also included. a sixth temperature-controlled valve having one valve port connected to another valve port of the fourth three-way valve, wherein the opening trigger temperature of the sixth temperature-controlled valve is higher than that of the fourth temperature-controlled valve; a sixth pump having an input port connected to another valve port of a sixth temperature control valve; a third air heat exchanger in communication with an output port of the sixth pump; a second four-way valve having one valve port connected to a hot gas exhaust port of a third air heat exchanger, another valve port of the second four-way valve being used to exhaust hot gas from the third air heat exchanger, another valve port of the second four-way valve being connected to another valve port of the fifth three-way valve, and another valve port of the second four-way valve being connected to another valve port of the fourth three-way valve; a ninth three-way valve having one valve port connected to the water outlet of the second air heat exchanger, another valve port of the ninth three-way valve being used for discharging water from the second air heat exchanger, and another valve port of the ninth three-way valve being connected to the water inlet of the third air heat exchanger; as well as The water discharge pipe is used to discharge water from the third air heat exchanger.

5. A distributed energy station system based on cascaded waste heat utilization according to claim 1, characterized in that: Also includes A first controller for controlling the linkage between the first temperature control valve and the first pump; and A second controller controls the linkage between the second temperature control valve and the second pump.

6. A distributed energy station system based on cascade utilization of waste heat according to claim 2, characterized in that: Also includes a third controller for controlling the linkage between the third temperature control valve and the third pump; and a fourth controller for controlling the linkage between the fourth temperature control valve and the fourth pump.

7. A distributed energy station system based on cascaded waste heat utilization according to claim 3, characterized in that: Also includes a fifth controller for controlling the linkage between the fifth temperature control valve and the fifth pump.

8. A distributed energy station system based on cascaded waste heat utilization according to claim 4, characterized in that: Also includes a sixth controller for controlling the linkage between the sixth temperature control valve and the sixth pump.

9. A distributed energy station system based on cascaded waste heat utilization according to claim 1, characterized in that: The waste heat boiler adopts a supplementary burning type waste heat boiler.

10. A distributed energy station system based on cascaded waste heat utilization according to claim 1, characterized in that: The invention also includes a first heat preservation tank and a second heat preservation tank for collecting the water discharged from the first water heat exchanger and the second water heat exchanger respectively.

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