Water vapor compression system for waste heat recovery

Abstract

The utility model provides a steam compression system for waste heat recovery, which is applied to a printing and dyeing workshop and comprises a first flash tank, a second flash tank, a third flash tank and a steam pipe network, and a fourth inlet of the third flash tank is connected with a second hot water discharge outlet of the printing and dyeing workshop. The first flash tank, the second flash tank and the third flash tank sequentially perform flash evaporation on hot water generated by the printing and dyeing workshop to generate steam with different temperatures, and the steam is conveyed to the steam pipe network and is conveyed to the places, needing steam, of the printing and dyeing workshop through the steam pipe network. According to the steam compression system for waste heat recovery, waste heat of hot water generated in the printing and dyeing process in a printing and dyeing workshop is recovered and used for producing steam, and energy waste is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of water vapor compression system especially relates to a water vapor compression system of waste heat recovery. BACKGROUND

[0002] The printing and dyeing process in the printing and dyeing workshop can produce hot water of different temperatures, and the traditional treatment mode is to discharge these hot water as waste water, however, the printing and dyeing process needs steam, and the steam amount needed is relatively large. The traditional treatment mode is difficult to recycle the waste heat of the hot water produced by the printing and dyeing process, and cannot use these waste heat to produce steam, thereby causing energy waste. UTILITY MODEL CONTENT

[0003] The technical purpose of the utility model is to provide a water vapor compression system of waste heat recovery, which aims at recycling the waste heat of the hot water produced by the printing and dyeing process, and using these waste heat to produce steam, avoiding energy waste.

[0004] To solve the above technical problem, the utility model discloses a water vapor compression system of waste heat recovery, which is applied to a printing and dyeing workshop, and comprises:

[0005] A first flash tank, comprising a first inlet, a first steam outlet and a first outlet, wherein the first inlet is connected with a first hot water discharge port of the printing and dyeing workshop;

[0006] A second flash tank, comprising a second inlet, a second steam outlet and a second outlet, wherein the second inlet is connected with the first outlet;

[0007] A third flash tank, comprising a third inlet, a fourth inlet and a third steam outlet, wherein the third inlet is connected with the second outlet, the fourth inlet is connected with a second hot water discharge port of the printing and dyeing workshop, the temperature of the hot water discharged from the second hot water discharge port is lower than that of the hot water discharged from the first hot water discharge port, and the second steam outlet and the third steam outlet are combined into a fourth steam outlet;

[0008] A steam pipe network, wherein the first steam outlet and the fourth steam outlet are connected with the steam pipe network.

[0009] Further, the second steam outlet is provided with a first adjusting valve, and the third steam outlet is provided with a second adjusting valve.

[0010] Further, the water vapor compression system of waste heat recovery comprises a water vapor compressor, the inlet of the water vapor compressor is connected with the fourth steam outlet, and the outlet of the water vapor compressor is connected with the steam pipe network.

[0011] Further, a check valve is arranged in the pipeline between the outlet of the water vapor compressor and the steam pipe network.

[0012] A check valve is arranged in the pipeline between the first steam outlet and the steam pipe network.

[0013] A third regulating valve is arranged in the pipeline between the second outlet and the third inlet.

[0014] Further, the waste heat recovery water vapor compression system comprises a first hot water filter, an inlet end of which is connected with a first hot water discharge port of the printing and dyeing workshop, and an outlet end of which is connected with the first inlet.

[0015] The waste heat recovery water vapor compression system comprises a second hot water filter, an inlet end of which is connected with a second hot water discharge port of the printing and dyeing workshop, and an outlet end of which is connected with the fourth inlet.

[0016] Further, the first hot water filter is provided with a first liquid level control switch, and the outlet end of the first hot water filter is provided with a first water pump, the first liquid level control switch being connected with the first water pump.

[0017] The second hot water filter is provided with a second liquid level control switch, and the outlet end of the second hot water filter is provided with a second water pump, the second liquid level control switch being connected with the second water pump.

[0018] Further, the first outlet is connected with the second inlet through a first pipeline and a second pipeline, the first pipeline and the second pipeline being arranged in parallel, the first pipeline being provided with a ball valve and the drain valve, the second pipeline being provided with a check valve and a third water pump, and the first flash tank being provided with a third liquid level control switch, the third liquid level control switch being connected with the third water pump.

[0019] Further, the first flash tank, the second flash tank, and the third flash tank are each provided with a temperature sensor and a pressure sensor.

[0020] Further, the second flash tank is provided with a third outlet, the third outlet being provided with a fourth water pump and a fourth liquid level control switch, the fourth liquid level control switch being connected with the fourth water pump.

[0021] The third flash tank is provided with a fourth outlet, the fourth outlet being provided with a fifth water pump and a fifth liquid level control switch, the fifth liquid level control switch being connected with the fifth water pump.

[0022] Further, the waste heat recovery water vapor compression system comprises a controller connected with the first flash tank, the second flash tank and the third flash tank respectively, and the controller is used for controlling the first flash tank, the second flash tank and the third flash tank to operate.

[0023] The utility model provides a kind of waste heat recovery water vapor compression system, it is applied to printing and dyeing workshop, including first flash tank, second flash tank, third flash tank and steam pipe network, the first inlet of first flash tank is connected with the first hot water discharge port of printing and dyeing workshop, the fourth inlet of third flash tank is connected with the second hot water discharge port of printing and dyeing workshop.First flash tank, second flash tank and third flash tank sequentially flash the hot water generated by printing and dyeing workshop, produce steam of different temperature, and these steam is transported to steam pipe network, is transported to the place where printing and dyeing workshop needs steam by steam pipe network.The waste heat recovery water vapor compression system of the utility model recycles the waste heat of hot water generated by printing and dyeing process in printing and dyeing workshop, and these waste heat is used to produce steam, avoid the waste of energy. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the overall structure schematic diagram of waste heat recovery water vapor compression system in the utility model embodiment.

[0025] In the drawing, each reference mark represents: 1, first flash tank;11, first inlet;12, first steam outlet;13, first outlet;14, third liquid level control switch;2, second flash tank;21, second inlet;22, second steam outlet;221, first regulating valve;23, second outlet;24, third regulating valve;25, third outlet;251, fourth water pump;252, fourth liquid level control switch;3, third flash tank;31, third inlet;32, fourth inlet;33, third steam outlet;331, second regulating valve;34, fourth outlet;341, fifth water pump;342, fifth liquid level control switch;4, steam pipe network;5, water vapor compressor;6, first hot water filter;61, first liquid level control switch;62, first water pump;7, second hot water filter;71, second liquid level control switch;72, second water pump;101, first pipeline;1011, ball valve;1012, trap;102, second pipeline;1021, third water pump;103, temperature sensor;104, pressure sensor;105, check valve. DETAILED DESCRIPTION

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] As attached Figure 1 The diagram shown is an overall structural schematic of the waste heat recovery water vapor compression system in an embodiment of this utility model. This waste heat recovery water vapor compression system is applied in a dyeing and printing workshop, which includes a stenter, dyeing vat, and drying equipment. The waste heat recovery water vapor compression system is used to recover waste heat generated by the stenter, dyeing vat, and drying equipment. (See attached diagram...) Figure 1 As can be seen from the above, the waste heat recovery steam compression system includes a first flash tank 1, a second flash tank 2, a third flash tank 3, and a steam pipeline network 4.

[0030] The first flash tank 1 comprises a first inlet 11, a first steam outlet 12 and a first outlet 13. The first inlet 11 is connected to a first hot water discharge port (not shown in the figure) of the printing and dyeing workshop. The hot water discharged from the first hot water discharge port of the printing and dyeing workshop is first subjected to the first flash tank 1. Since the hot water just discharged has a high temperature, the first flash tank 1 can generate steam with a high temperature. Exemplarily, the hot water discharged from the first hot water discharge port of the printing and dyeing workshop has a temperature of 150-170°C. The hot water is subjected to flash in the first flash tank 1 to generate steam with a temperature of 140-160°C. The first hot water discharge port has a certain distance to the first flash tank 1, and the first hot water discharge port is connected to the first flash tank 1 through a pipeline. During the flow of the hot water in the pipeline, some heat is dissipated, and thus the temperature of the hot water reaching the first flash tank 1 is slightly lower than the temperature of the hot water at the first hot water discharge port. The hot water is subjected to one-time flash in the first flash tank 1, and the generated hot water is directly delivered to the steam pipe network 4. The tank body of the first flash tank 1 is cylindrical and is made of carbon steel, and the inner wall has a corrosion-resistant coating.

[0031] The second flash tank 2 comprises a second inlet 21, a second steam outlet 22 and a second outlet 23. The second inlet 21 is connected to the first outlet 13, i.e. the second flash tank 2 is connected to the first flash tank 1. The hot water is subjected to flash in the first flash tank 1, and the flashed hot water still has a high temperature, so that the hot water discharged from the first flash tank 1 can be subjected to two-time flash. Exemplarily, the temperature of the hot water discharged from the first outlet 13 of the first flash tank 1 is 140-150°C. The hot water is subjected to flash in the second flash tank 2 to generate steam with a temperature of 130-145°C. Understandably, the temperature of the steam generated by the second flash tank 2 is lower than the temperature of the steam generated by the first flash tank 1. Exemplarily, the second flash tank 2 is a high-pressure steam flash tank. The tank body of the second flash tank 2 is a pressure-resistant container and is made of alloy steel, which has good heat preservation performance. The tank body is provided with a heat exchange coil to improve the steam generation efficiency.

[0032] The third flash tank 3 comprises a third inlet 31, a fourth inlet 32 and a third steam outlet 33, the third inlet 31 is connected with the second outlet 23, the fourth inlet 32 is connected with a second hot water discharge port (not shown in the figure) of the printing and dyeing workshop, the hot water discharged from the second hot water discharge port has a lower temperature than the hot water discharged from the first hot water discharge port, and the second steam outlet 22 and the third steam outlet 33 are merged into a fourth steam outlet (not shown in the figure). The second flash tank 2 is connected with the third flash tank 3, after the hot water is flashed in the second flash tank 2, the hot water flows to the third flash tank 3 and is flashed for the third time in the third flash tank 3. Since the hot water discharged from the first hot water discharge port of the printing and dyeing workshop has a higher temperature, the hot water can be flashed for three times to obtain more steam, so that the heat of the hot water can be recycled and utilized to the maximum extent. In addition, the third flash tank 3 is connected with the second hot water discharge port of the printing and dyeing workshop. Since the hot water discharged from the second hot water discharge port of the printing and dyeing workshop has a lower temperature, the hot water can be flashed once in the third flash tank 3 to recover the heat in the hot water. Exemplarily, the temperature of the hot water discharged from the second hot water discharge port is 95-105 DEG C. Exemplarily, the third flash tank 3 is a low-pressure steam flash tank, the tank body of the third flash tank 3 is a pressure-resistant container and is made of alloy steel and has good heat preservation performance. Heat exchange coils are arranged in the tank body, so that the steam generation efficiency can be improved.

[0033] The first steam outlet 12 and the fourth steam outlet are both connected with the steam pipe network 4, that is, the steam generated by the first flash tank 1 is directly delivered to the steam pipe network 4. The steam generated by the second flash tank 2 and the steam generated by the third flash tank 3 are mixed and then delivered to the steam pipe network 4. Since the temperature of the steam generated by the second flash tank 2 is different from the temperature of the steam generated by the third flash tank 3, the steam generated by the second flash tank 2 and the steam generated by the third flash tank 3 can be mixed according to the set steam temperature of the fourth steam outlet to obtain the set steam temperature of the fourth steam outlet. The steam pipe network 4 delivers the steam to the places in the printing and dyeing workshop where steam is needed, so that the recovered heat can be fully utilized.

[0034] Through the above embodiment, it can be known that the waste heat recovery water vapor compression system of the utility model recovers the waste heat of the hot water generated in the printing and dyeing process of the printing and dyeing workshop, and uses the waste heat to produce steam, so that the waste of energy is avoided.

[0035] In some embodiments, the second steam outlet 22 is provided with a first regulating valve 221, and the third steam outlet is provided with a second regulating valve 331. It can also be understood that the pipeline connected with the second steam outlet 22 is provided with the first regulating valve 221, and the pipeline connected with the third steam outlet 33 is provided with the second regulating valve 331. The first regulating valve 221 is used to regulate the steam flow, pressure and temperature of the second steam outlet 22, and the second regulating valve 331 is used to regulate the steam flow, pressure and temperature of the third steam outlet 33. The steam flow, pressure and temperature can be regulated by the first regulating valve 221 and the second regulating valve 331 according to the set steam temperature of the fourth steam outlet, and the mixing ratio of the two steam flows can be accurately controlled, so that the steam temperature of the fourth steam outlet is the preset temperature, and the preset temperature is greater than or equal to 105℃. Illustratively, the temperature of the steam discharged from the fourth steam outlet is 105℃, that is, the steam generated by the second flash tank 2 and the steam generated by the third flash tank 3 are mixed to obtain steam at 105℃. The first regulating valve 221 and the second regulating valve 331 can be pneumatic regulating valves.

[0036] In some embodiments, the water vapor compression system for waste heat recovery includes a water vapor compressor 5, the inlet of the water vapor compressor 5 is connected with the fourth steam outlet, and the outlet of the water vapor compressor 5 is connected with the steam pipe network 4. The steam in the steam pipe network 4 can be directly delivered to the place where steam is needed in the printing and dyeing workshop. There is a certain requirement for the steam temperature of the steam delivered to the steam pipe network 4 from the fourth steam outlet, and the steam temperature of the steam delivered to the steam pipe network 4 from the fourth steam outlet needs to reach the steam preset temperature. Illustratively, the steam preset temperature is 150℃. Since the steam temperature of the fourth steam outlet cannot reach 150℃, the steam output from the fourth steam outlet is compressed by the water vapor compressor 5 to obtain saturated steam at 150℃. The water vapor compressor 5 can be a double-screw water vapor compressor 5.

[0037] The water vapor compressor 5 is made of stainless steel as a whole, has excellent corrosion resistance, and has high steam compression performance, which can realize the compression work of changing 105℃ steam into 150℃ steam. The inlet of the steam compressor and the outlet of the water vapor compressor 5 are well connected with the steam delivery pipeline and have a damping device.

[0038] The pipelines in the water vapor compression system for waste heat recovery and the steam pipelines, and the pipelines in the steam pipe network 4 adopt polyurethane foam insulation steel pipes with good insulation performance, and temperature monitoring points are arranged on the pipelines.

[0039] In some embodiments, a check valve 105 is arranged in the pipeline between the outlet of the water vapor compressor 5 and the steam pipe network 4. The check valve 105 can prevent the steam in the steam pipe network 4 from flowing back to the water vapor compressor 5, and only allow the water vapor to flow from the water vapor compressor 5 to the steam pipe network 4.

[0040] Likewise, in some embodiments, a check valve 105 is provided in the pipe between the first steam outlet 12 and the steam pipe network 4, which prevents the steam in the steam pipe network 4 from flowing back to the first flash tank 1, and only allows water vapor to flow from the first flash tank 1 to the steam pipe network 4.

[0041] In some embodiments, a third regulating valve 24 is provided in the pipe between the second outlet 23 and the third inlet 31, which is used to regulate the pressure, temperature and flow rate of the hot water flowing from the second flash tank 2 to the third flash tank 3, so as to prevent the hot water in the second flash tank 2 from flowing to the third flash tank 3 in disorder.

[0042] In some embodiments, the waste heat recovery water vapor compression system comprises a first hot water filter 6, the inlet end of which is connected to the first hot water discharge port of the printing and dyeing workshop, and the outlet end of which is connected to the first inlet 11. The first hot water filter 6 filters the hot water discharged from the first hot water discharge port of the printing and dyeing workshop, so as to prevent impurities in the hot water from entering the first flash tank 1 and affecting the operation of the first flash tank 1. For example, the first hot water filter 6 is made of stainless steel and has multiple layers of metal filter screens inside for filtering impurities in the hot water. The capacity of the first hot water filter 6 is determined according to actual conditions, and it has a large water inlet and a large water outlet to facilitate the rapid inflow and outflow of hot water.

[0043] In some embodiments, the first hot water filter 6 is provided with a first liquid level control switch 61, and the outlet end of the first hot water filter 6 is provided with a first water pump 62, and the first liquid level control switch 61 is connected to the first water pump 62. The first liquid level control switch 61 controls the first water pump 62 according to the liquid level in the first hot water filter 6.

[0044] In some embodiments, the waste heat recovery water vapor compression system comprises a second hot water filter 7, the inlet end of which is connected to the second hot water discharge port of the printing and dyeing workshop, and the outlet end of which is connected to the fourth inlet 32. Likewise, the second hot water filter 7 filters the hot water discharged from the second hot water discharge port of the printing and dyeing workshop, so as to prevent impurities in the hot water from entering the third flash tank 3 and affecting the operation of the third flash tank 3.

[0045] In some embodiments, the second hot water filter 7 is provided with a second liquid level control switch 71, and the outlet end of the second hot water filter 7 is provided with a second water pump 72, and the second liquid level control switch 71 is connected to the second water pump 72. The second liquid level control switch 71 controls the second water pump 72 according to the liquid level in the second hot water filter 7.

[0046] In some embodiments, the first outlet 13 is connected to the second inlet 21 through the first pipeline 101 and the second pipeline 102, the first pipeline 101 and the second pipeline 102 are arranged in parallel, the first pipeline 101 is provided with a ball valve 1011 and a trap 1012, the trap 1012 can effectively remove the condensed water in the steam pipeline, prevent the water hammer phenomenon, and ensure the stable operation of the system. The second pipeline 102 is provided with a check valve 105 and a third water pump 1021, and the first flash tank 1 is provided with a third liquid level control switch 14 connected to the third water pump 1021. The check valve 105 prevents the hot water in the second pipeline 102 from flowing backward, and the hot water can only flow from the first flash tank 1 to the second flash tank 2. The third liquid level control switch 14 controls the operation of the third water pump 1021 according to the liquid level of the first flash tank 1, for example, when the liquid level of the first flash tank 1 is lower than the minimum liquid level, the third water pump 1021 stops running.

[0047] The first water pump 62, the second water pump 72 and the third water pump 1021 in the above embodiments can be centrifugal pumps, the pump body is casted by high-temperature-resistant material and can withstand the delivery of hot water above 150 degrees.

[0048] In some embodiments, the first flash tank 1, the second flash tank 2 and the third flash tank 3 are each provided with a temperature sensor 103 and a pressure sensor 104, the temperature sensor 103 is used to detect the temperature of the first flash tank 1, the second flash tank 2 and the third flash tank 3, so as to ensure that the temperature of the first flash tank 1, the second flash tank 2 and the third flash tank 3 reaches the temperature requirement, and if the temperature in the first flash tank 1, the second flash tank 2 and the third flash tank 3 does not reach the temperature requirement, a prompt or a reminder can be given. The pressure sensor 104 is used to detect the pressure of the first flash tank 1, the second flash tank 2 and the third flash tank 3, so as to ensure that the pressure of the first flash tank 1, the second flash tank 2 and the third flash tank 3 reaches the pressure requirement. If the pressure in the first flash tank 1, the second flash tank 2 and the third flash tank 3 does not reach the pressure requirement, a prompt or a reminder can be given.

[0049] In some embodiments, the second flash tank 2 is provided with a third outlet 25, the third outlet 25 is provided with a fourth water pump 251 and a fourth liquid level control switch 252 connected to the fourth water pump 251. The third outlet 25 can discharge hot water in the second flash tank 2 for use in other processes of printing and dyeing. The fourth liquid level control switch 252 controls the operation of the fourth water pump 251 according to the liquid level of the second flash tank 2.

[0050] In some embodiments, the third flash tank 3 is provided with a fourth outlet 34, the fourth outlet 34 is provided with a fifth water pump 341 and a fifth liquid level control switch 342, the fifth liquid level control switch 342 is connected with the fifth water pump 341. Similarly, the fourth outlet 34 can discharge hot water in the third flash tank 3 for other processes of printing and dyeing. The fifth liquid level control switch 342 controls the operation of the fifth water pump 341 according to the liquid level of the third flash tank 3.

[0051] Since the hot water discharged from the second flash tank 2 and the third flash tank 3 has different temperatures, the hot water discharged from the third outlet 25 and the fourth outlet 34 can be used for different printing and dyeing processes.

[0052] In some embodiments, the waste heat recovery water vapor compression system comprises a controller (not labeled in the figure) connected with the first flash tank 1, the second flash tank 2, and the third flash tank 3 respectively, and the controller is used to control the operation of the first flash tank 1, the second flash tank 2, and the third flash tank 3.

[0053] In addition, the controller is connected with the first regulating valve 221, the second regulating valve 331, the third regulating valve 24, the temperature sensor 103, and the pressure sensor 104 in the above-mentioned embodiments, and is used to control the operation of the first regulating valve 221, the second regulating valve 331, and the third regulating valve 24, and adjust the temperature of the first flash tank 1, the second flash tank 2, and the third flash tank 3 according to the temperature detected by the temperature sensor 103, and adjust the pressure of the first flash tank 1, the second flash tank 2, and the third flash tank 3 according to the pressure detected by the pressure sensor 104. The controller monitors the temperature, pressure, liquid level and other parameters of each link throughout the process, and adjusts the opening degree of each regulating valve and the operation state of the equipment to ensure stable and efficient operation of the whole system.

[0054] The controller can include any suitable processing device having data processing capability and / or instruction execution capability. For example, the controller can be implemented by one or a combination of programmable logic controllers (PLC), digital signal processors (DSP), field programmable gate arrays (FPGA), programmable logic arrays (PLA), central processing units (CPU), application-specific integrated circuits (ASIC), micro control units (MCU), and other forms of processing units. For example, the controller can be a master control chip in the waste heat recovery water vapor compression system, i.e. a master control MCU.

[0055] In the printing and dyeing workshop, the waste heat recovery water vapor compression system is installed according to the equipment layout. First, the setting machine hot water collector and the dyeing cylinder drying hot water collector are started to collect waste heat water. Then, the first flash tank 1, the second flash tank 2 and the third flash tank 3 start to work, generate steam and mix and supply steam according to the design process. The controller automatically adjusts the opening degree of each regulating valve and the running state of the equipment according to the preset parameters such as steam pressure, temperature, hot water level, etc. For example, when the third flash tank 3 pressure is too low, the controller controls the third regulating valve 24 to increase the amount of hot water flowing from the second flash tank 2 to the third flash tank 3, and to increase the pressure and temperature of the third flash tank 3. During the operation of the whole system, the operator can check the parameters in real time through the monitoring system of the waste heat recovery water vapor compression system, and can adjust the parameters of the controller according to the actual situation, so as to ensure that the system runs in the best state, realizes the efficient recovery and utilization of waste heat in the printing and dyeing workshop.

[0056] The waste heat recovery water vapor compression system of the utility model can fully recover the waste heat generated in the printing and dyeing workshop, convert it into usable steam resources, improve the energy utilization rate, and reduce energy waste. Through accurate steam mixing and pressure and temperature adjustment, suitable steam can be stably provided for the printing and dyeing process to meet the demand of different processes for steam, reduce the production cost of enterprises, and be also beneficial to environmental protection.

[0057] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A waste heat recovery water vapor compression system, characterized by, The waste heat recovery water vapor compression system is applied to a printing and dyeing workshop, and comprises: A first flash tank comprising a first inlet, a first steam outlet and a first outlet, wherein the first inlet is connected with a first hot water discharge port of the printing and dyeing workshop; A second flash tank comprising a second inlet, a second steam outlet and a second outlet, wherein the second inlet is connected with the first outlet; A third flash tank comprising a third inlet, a fourth inlet and a third steam outlet, wherein the third inlet is connected with the second outlet, the fourth inlet is connected with a second hot water discharge port of the printing and dyeing workshop, the second hot water discharge port discharges hot water at a temperature lower than that of the first hot water discharge port, and the second steam outlet and the third steam outlet are combined into a fourth steam outlet; A steam pipe network, wherein the first steam outlet and the fourth steam outlet are connected with the steam pipe network.

2. The waste heat recovery water vapor compression system of claim 1, wherein, The second steam outlet is provided with a first regulating valve, and the third steam outlet is provided with a second regulating valve.

3. The waste heat recovery water vapor compression system of any of claims 1-2, wherein, The waste heat recovery water vapor compression system comprises a water vapor compressor, an inlet of the water vapor compressor is connected with the fourth steam outlet, and an outlet of the water vapor compressor is connected with the steam pipe network.

4. The waste heat recovery water vapor compression system of claim 3, wherein, A pipeline between the outlet of the water vapor compressor and the steam pipe network is provided with a check valve; A pipeline between the first steam outlet and the steam pipe network is provided with a check valve; A pipeline between the second outlet and the third inlet is provided with a third regulating valve.

5. The waste heat recovery water vapor compression system of claim 1, wherein, The waste heat recovery water vapor compression system comprises a first hot water filter, an inlet end of the first hot water filter is connected with the first hot water discharge port of the printing and dyeing workshop, and an outlet end of the first hot water filter is connected with the first inlet; The waste heat recovery water vapor compression system comprises a second hot water filter, an inlet end of the second hot water filter is connected with the second hot water discharge port of the printing and dyeing workshop, and an outlet end of the second hot water filter is connected with the fourth inlet.

6. The waste heat recovery water vapor compression system of claim 5, wherein, The first hot water filter is provided with a first liquid level control switch, and the outlet end of the first hot water filter is provided with a first water pump, wherein the first liquid level control switch is connected with the first water pump; The second hot water filter is provided with a second liquid level control switch, and the outlet end of the second hot water filter is provided with a second water pump, wherein the second liquid level control switch is connected with the second water pump.

7. The waste heat recovery water vapor compression system of claim 1, wherein, The first outlet and the second inlet are connected through a first pipeline and a second pipeline, the first pipeline and the second pipeline are arranged in parallel, the first pipeline is provided with a ball valve and a trap valve, the second pipeline is provided with a check valve and a third water pump, and the first flash tank is provided with a third liquid level control switch, wherein the third liquid level control switch is connected with the third water pump.

8. The waste heat recovery water vapor compression system of claim 1, wherein, The first flash tank, the second flash tank and the third flash tank are all provided with temperature sensors and pressure sensors.

9. The waste heat recovery water vapor compression system of claim 1, wherein, The second flash tank is provided with a third outlet, the third outlet is provided with a fourth water pump and a fourth liquid level control switch, and the fourth liquid level control switch is connected with the fourth water pump; The third flash tank is provided with a fourth outlet, the fourth outlet is provided with a fifth water pump and a fifth liquid level control switch, and the fifth liquid level control switch is connected with the fifth water pump.

10. The waste heat recovery water vapor compression system of claim 1, wherein, The waste heat recovery water vapor compression system comprises a controller connected with the first flash tank, the second flash tank and the third flash tank respectively, and the controller is used for controlling the operation of the first flash tank, the second flash tank and the third flash tank.

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