A multi-color printing machine water-based ink cleaning water zero discharge separation concentration recycling device

Abstract

The utility model belongs to the field of energy conservation and environmental protection, concretely relates to a kind of water-based ink cleaning water zero discharge color separation concentration recycling device of multi-color printing machine. The device realizes the treatment of each color wastewater respectively by automatic identification of the color of water-based ink cleaning wastewater of each ink roller of multi-color printing machine, and the concentrated and purified water-based ink can be printed and recycled, and the separated clean water can be used for further cleaning of ink roller, achieving the effect of zero discharge. At the same time, different color concentration tanks operate in parallel, are independently processed and do not affect each other. The device efficiently recovers the secondary steam heat evaporated from water-based ink wastewater to heat the material, and realizes energy saving, stable operation of the whole device by combining solar heat collection and natural cold source. In the field of water-based ink cleaning wastewater treatment, compared with the prior art, the device has the advantages of high automation, high recycling rate, good treatment effect, low treatment cost and small space occupation, and can achieve the purpose of environmental protection, energy saving and carbon reduction.

Description

Technical Field

[0001] This utility model relates to the field of energy and environmental protection, specifically to a zero-discharge color separation, concentration and reuse device for cleaning water of water-based inks in multicolor printing presses. Background Technology

[0002] Multicolor printing presses are commonly used equipment in the printing industry. Each batch of printing requires different colors, or after each day's printing work, the printing press needs to be cleaned, which generates a large amount of high-color cleaning wastewater that needs to be treated.

[0003] Existing single-unit ink wastewater treatment equipment consists of only one concentration and separation tank and a corresponding heat source system. Each unit can only process ink wastewater of one color per process. If ink is to be processed and reused by color, multiple colors need to be processed in rotation, which is not only time-consuming but also requires cleaning the treatment tank after each treatment, generating new ink wastewater. Therefore, although the color separation rollers collect the washing water separately, for ease of processing, the separately collected washing water is mixed and then centrally treated. This also means that the treated products cannot be reused by color, thus losing their economic value.

[0004] In addition, the cleaning water from the different colored rollers is generally collected in ordinary buckets. After cleaning, the cleaning water from each bucket is manually poured into the treatment equipment. Alternatively, the cleaning water from each colored roller can be discharged into a unified drainage pipe for centralized collection and treatment. The former requires a large amount of manual labor, while the latter cannot be processed by color separation.

[0005] Existing processing equipment cannot meet the flexible processing needs of multiple concentration and separation tanks using a single heat source device. If single-color processing and recovery are required, multiple processing devices need to be set up, which involves large investment, large area, and high energy consumption. Utility Model Content

[0006] This invention aims to solve the problems and shortcomings of the existing technology and provides a zero-discharge color separation, concentration and reuse device for water-based ink cleaning water in multi-color printing presses.

[0007] The multi-color printing press water-based ink cleaning water zero-discharge color separation, concentration, and reuse device of this application includes one or more parallel water-based ink color separation, collection, and automatic distribution units; one or more parallel concentration and separation processing units; a circulating hot water distribution unit; a refrigeration and compression circulation unit; a heat recovery and vacuum generation unit; and a solar thermal utilization unit.

[0008] The water-based ink color separation collection and automatic distribution unit includes one or more sequentially connected cleaning water receiving hoppers, cleaning water lifting pumps, cleaning water storage tanks, and feeding stop valves, an automatic color recognition control device connected to each of the feeding stop valves, a cleaning water feeding pump connected to the automatic color recognition control device, and one or more feeding distribution valves connected to the cleaning water feeding pump.

[0009] The concentration and separation processing unit includes a concentration and separation tank connected to each of the feeding and distribution valves. The concentration and separation tank is equipped with a heating coil, a stirring motor, stirring blades, a defoamer, a discharge valve, and a steam vent valve.

[0010] The circulating hot water distribution unit includes a heating water tank, and the water supply pipeline of the heating water tank is connected to the concentration separation tank through a corresponding hot water distribution valve.

[0011] The refrigeration compression cycle unit includes a compressor, a refrigerant hot coil, and a refrigerant cold coil connected in sequence. The refrigerant hot coil is located in the heating water tank, and the refrigerant cold coil is located in the steam condenser. A subcooling regulator and an expansion valve are sequentially installed on the pipeline connecting the refrigerant hot coil and the refrigerant cold coil. A gas-liquid separator is installed on the pipeline connecting the refrigerant cold coil and the compressor.

[0012] The heat recovery and vacuum generation unit includes the steam condenser. The steam discharge pipeline of the concentration and separation tank of the concentration and separation processing unit is connected to the steam condenser. A spray head is provided at the top of the steam condenser. A condensate circulation pump and a condensate circulation valve are sequentially provided on the water outlet pipeline at the bottom of the spray head and the pipeline connected to the spray head. The condensate circulation pump is also connected to the condensate discharge valve. The steam condenser is connected to a vacuum pump. A water baffle is provided at the air inlet of the vacuum pump.

[0013] The solar thermal utilization unit includes a solar collector, a solar hot water storage tank, and a preheating heat exchanger connected in sequence. A solar water pump is installed on the pipeline connecting the solar collector and the solar hot water storage tank, and a preheating circulation pump is installed on the pipeline connecting the preheating heat exchanger and the solar hot water storage tank. The preheating heat exchanger is connected to the spray head and the spray head outlet in the steam condenser of the heat recovery and vacuum generation unit.

[0014] Advantages of the technical solution in this application:

[0015] To address the problems of existing technologies, this application provides a zero-discharge color separation, concentration, and reuse device for water-based ink cleaning water in multi-color printing presses. The advantages of this device include:

[0016] 1. The treatment of cleaning water for multiple colors of water-based inks is integrated into one device for color separation, which saves investment and reduces the floor space compared to setting up multiple single-color treatment devices.

[0017] 2. Automatic color recognition and separate processing reduce manual operation. Combined with low-temperature separation and concentration process, the main components of each single color ink are preserved, which enhances the economic value of water-based ink cleaning water recycling.

[0018] 3. The number of concentration and separation treatment units can be flexibly configured according to commonly used colors. Multi-connected hot water circulation heating pipelines are used to ensure the pressure difference between supply and return water. The start and stop of each concentration and separation treatment unit do not affect each other, and the treatment method is convenient.

[0019] 4. The condensate circulation spray direct contact method is used to efficiently absorb secondary steam, resulting in high heat exchange efficiency and small vacuum fluctuations, which improves heat recovery efficiency while meeting process requirements.

[0020] 5. The use of solar energy to collect heat meets the heat absorption requirements of the preheating stage, avoiding the problem of heat imbalance in the refrigeration cycle caused by the lack of secondary steam generation during the initial heating of the concentration and separation unit. This ensures the stability of the unit's operation and reduces operating costs and carbon emissions by utilizing renewable energy.

[0021] 6. After separating and purifying the cleaning water for various colors of water-based inks, the high-concentration water-based ink can be supplied to multi-color printing presses according to the color. The separated clean water can also be used for cleaning the printing press without generating waste, achieving zero discharge. It also saves the amount of raw ink and tap water used, and has significant economic and environmental value. Attached Figure Description

[0022] Figure 1 This is a system structure diagram of a multicolor printing press water-based ink cleaning water zero-discharge color separation, concentration and recycling device according to Example 1.

[0023] Figure 2 This is a system structure diagram of the zero-discharge color separation, concentration and recycling device for water-based ink cleaning water in a multi-color printing press according to Example 2.

[0024] Figure label:

[0025] 1: Cleaning water receiving hopper; 11: Cleaning water lifting pump; 12: Cleaning water storage tank; 13: Feeding stop valve; 14: Automatic color recognition control device; 15: Cleaning water feeding pump; 16: Feeding distribution valve.

[0026] 2: Concentration and separation tank; 21: Heating coil; 22: Stirring motor; 23: Stirring blades; 24: Defoamer; 25: Discharge valve; 26: Steam vent valve.

[0027] 3: Heating water tank; 31: Hot water circulation pump; 32: Hot water distribution valve; 33: Differential pressure bypass control valve;

[0028] 4: Compressor; 41b: Heat exchanger; 42: Subcooling regulator; 43: Expansion valve; 45: Gas-liquid separator; 46b: Hot water pump.

[0029] 5: Steam condensate tank; 51: Condensate circulation pump; 52: Condensate circulation valve; 53: Condensate discharge valve; 54: Spray head; 55: Water level gauge; 56: Water baffle; 57: Vacuum pump.

[0030] 6b: Solar photovoltaic module; 61b: Electric heating element; 62: Solar hot water storage tank; 63: Preheating circulation pump; 64: Preheating heat exchanger. Detailed Implementation

[0031] The multicolor printing press water-based ink cleaning water zero-discharge color separation concentration and reuse device includes one or more water-based ink color separation collection automatic distribution units, one or more concentration separation treatment units, circulating hot water distribution units, refrigeration compression circulation units, heat recovery and vacuum generation units, and solar thermal utilization units.

[0032] The water-based ink color separation and collection automatic distribution unit includes one or more sequentially connected components: a cleaning water receiving hopper, a cleaning water booster pump, a cleaning water storage tank, and a feeding stop valve; an automatic color recognition control device connected to each of the feeding stop valves; a cleaning water feeding pump connected to the automatic color recognition control device; and one or more feeding distribution valves connected to the cleaning water feeding pump. The printing press cleaning water received by the cleaning water receiving hopper is sent to the cleaning water storage tank for storage via the cleaning water booster pump. The automatic color recognition control device opens the corresponding feeding distribution valve according to the color of the cleaning water in the corresponding cleaning water storage tank, and the cleaning water is sent to the corresponding concentration and separation tank by the cleaning water feeding pump. The number of water-based ink color separation and collection pipelines can be flexibly configured according to the number of printing press cleaning water outlets.

[0033] The concentration and separation processing unit includes a concentration and separation tank connected to each of the feeding and distribution valves. The concentration and separation tank is equipped with a heating coil, a stirring motor, stirring blades, a defoamer, a discharge valve, and a steam vent valve. The material entering the concentration and separation tank is heated and evaporated at low temperature by the heating coil. The generated secondary steam and excess gas are discharged through the steam vent valve. The processed concentrated material is discharged through the discharge valve. During the processing, the stirring motor drives the stirring blades to stir the material, enhance heat exchange and prevent material adhesion. The defoamer is used to prevent droplets from being carried out by the secondary steam. The number of concentration and separation processing units can be flexibly set according to the conventional color categories used, with multiple primary color units and one mixed color unit.

[0034] The refrigeration compression cycle unit includes a compressor, a refrigerant hot coil, and a refrigerant cold coil connected in sequence. The refrigerant hot coil is located inside the heating water tank, and the refrigerant cold coil is located inside the steam condenser. A subcooling regulator and an expansion valve are sequentially installed on the pipeline connecting the refrigerant hot coil and the refrigerant cold coil. A gas-liquid separator is installed on the pipeline connecting the refrigerant cold coil and the compressor. By utilizing the reverse Carnot cycle principle, the heat of secondary steam condensation generated during material concentration is recovered and used to heat the water in the heating water tank. The subcooling regulator uses air to cool the refrigerant to ensure the normal operation of the cycle.

[0035] The heat recovery and vacuum generation unit includes a steam condenser. A spray head is located at the top of the steam condenser. A water outlet pipe at the bottom of the spray head is connected to the spray head. A condensate circulation pump and a condensate circulation valve are sequentially installed on the water outlet pipe connected to the spray head. The condensate circulation pump is also connected to a condensate discharge valve. The steam condenser is connected to a vacuum pump. A water baffle is located at the vacuum pump's suction port. A certain level of condensate is retained in the steam condenser. The condensate is circulated and sprayed through the condensate circulation pump, condensate circulation valve, and spray head to directly absorb secondary steam. A water level gauge controls the condensate discharge valve to discharge excess condensate. The vacuum pump extracts excess gas from the concentration separation tank and the steam condenser to maintain a constant vacuum. The water baffle is located at the vacuum pump's suction port to prevent the intake of spray water droplets.

[0036] The solar thermal utilization unit includes a solar collector, a solar hot water storage tank, and a preheating heat exchanger connected sequentially. A solar water pump is installed on the pipeline connecting the solar collector and the solar hot water storage tank, and a preheating circulation pump is installed on the pipeline connecting the preheating heat exchanger and the solar hot water storage tank. The preheating heat exchanger is connected to the spray head and the spray head outlet in the steam condenser. The solar collector circulates heat through the solar water pump, storing the heat in the solar hot water storage tank. During the initial sensible heat rise stage of the concentration and separation unit when the dilute material is being processed, before secondary steam is generated, the preheating circulation pump and preheating heat exchanger use the hot water from the solar hot water storage tank to heat the condensate, providing heat to the refrigeration compression cycle unit to ensure the normal operation of the system.

[0037] The cleaning water receiving hopper is used to receive the cleaning water from the printing press. The cleaning water is then pumped to the cleaning water storage tank by the cleaning water lift pump. The automatic color recognition control device rotates and inspects to open each feeding stop valve, and opens the corresponding feeding distribution valve according to the color of the cleaning water in the corresponding cleaning water storage tank. The cleaning water is then pumped to the corresponding concentration and separation tank by the cleaning water feeding pump. The number of water-based ink color separation collection pipelines can be flexibly configured according to the number of cleaning water outlets of the printing press.

[0038] The water-based ink color separation and collection automatic distribution unit receives the washing water dilution material entering the concentration and separation tank. Under vacuum, the material is heated at low temperature by a heating coil for evaporation. The generated secondary steam and excess gas are discharged through a steam vent valve, and the processed concentrated material is discharged through a discharge valve. During the process, a stirring motor drives stirring blades to stir the material, enhancing heat exchange and preventing material adhesion. A defoamer is used to prevent droplets from being carried out by the secondary steam. The number of concentration and separation processing units can be flexibly set according to the commonly used color categories, with multiple primary color units and one mixed color unit.

[0039] Hot water is stored in the heating tank and circulates in the pipeline through a hot water circulation pump. When a certain concentration and separation treatment unit is working, the corresponding hot water distribution valve opens to supply water for heating. The differential pressure bypass control valve is used to maintain a constant differential pressure between the supply and return water pipelines, ensuring that the start and stop of each concentration and separation treatment unit does not affect the circulation and heating of the entire hot water pipeline.

[0040] The refrigeration compression cycle unit recovers the heat of secondary steam condensation generated by material concentration through the reverse Carnot cycle principle, which is used to heat the hot water in the heating water tank. The subcooling regulator cools the refrigerant with air to ensure the normal operation of the cycle.

[0041] During operation, the steam condenser contains condensate at a certain level. The condensate is circulated and sprayed by a condensate circulation pump, a condensate circulation valve, and a spray head to directly absorb secondary steam. The water level gauge controls the condensate discharge valve to discharge excess condensate. The vacuum pump extracts excess gas from the concentration separation tank and the steam condenser to maintain a constant vacuum. A water baffle is installed at the vacuum pump intake to prevent spray water droplets from being sucked in.

[0042] The solar collector stores heat in a solar hot water tank through a solar water pump. When no secondary steam is generated during the initial sensible heat rise of the dilute material in the concentration and separation unit, the hot water in the solar hot water tank is used to heat the condensate through a preheating circulation pump and a preheating heat exchanger to provide heat to the refrigeration and compression circulation unit, thus ensuring the normal operation of the system.

[0043] After being processed by the concentration and separation unit, the concentrated water-based ink material is discharged through the discharge valve and can be reused for printing on multicolor printing presses.

[0044] Excess condensate is discharged from the condensate drain valve of the heat recovery and vacuum generation unit and can be reused for cleaning of multicolor printing presses.

[0045] The following is combined Figures 1-2 The technical solution of this application will be further explained.

[0046] Example 1

[0047] like Figure 1 As shown, the multi-color printing press water-based ink cleaning water zero-discharge color separation, concentration, and reuse device of this application includes a water-based ink color separation collection and automatic distribution unit, a concentration and separation treatment unit, a circulating hot water distribution unit, a refrigeration compression circulation unit, a heat recovery and vacuum generation unit, and a solar thermal utilization unit, wherein...

[0048] The automatic water-based ink color separation and collection distribution unit includes a cleaning water receiving hopper 1, a cleaning water booster pump 11, a cleaning water storage tank 12, a feeding stop valve 13, an automatic color recognition control device 14, a cleaning water feeding pump 15, and a feeding distribution valve 16. The cleaning water receiving hopper 1 corresponds one-to-one with the cleaning water drain outlet of the multi-color printing press. When cleaning is performed after printing, it collects the cleaning water from the printing press. The cleaning water entering the receiving hopper 1 is pumped by the booster pump 11 to the storage tank 12 for storage and further processing. After cleaning, the automatic color recognition control device 14 sequentially opens each feeding stop valve 13 and identifies the color of the corresponding cleaning water in the storage tank 12. Based on the color, it opens the corresponding feeding distribution valve 16, and the cleaning water is pumped by the feeding pump 15 to the corresponding concentration and separation tank 2.

[0049] The concentration and separation processing unit includes a concentration and separation tank 2, a heating coil 21, a stirring motor 22, stirring blades 23, a defoamer 24, a discharge valve 25, and a steam vent valve 26. The diluted washing material entering the concentration and separation tank 2 is heated at low temperature and evaporated under vacuum by the heating coil 21. The resulting secondary steam and excess gas are discharged through the steam vent valve 26. During the process, the stirring motor 22 drives the stirring blades 23 to stir, enhancing heat exchange and preventing material adhesion. The defoamer 24, located at the top of the concentration and separation tank 2, is used to entrain droplets with the secondary steam. After processing, the concentrated material is discharged through the discharge valve 25. The number of concentration and separation processing units can be flexibly set according to the commonly used color categories, with multiple primary color units (such as four-color water-based inks: red, yellow, blue, and black) and one mixed color unit.

[0050] The circulating hot water distribution unit includes a heating water tank 3, a hot water circulation pump 31, a hot water distribution valve 32, and a differential pressure bypass control valve 33. The heating water tank 3 stores hot water, which circulates in the pipeline via the hot water circulation pump 31. When a concentration and separation processing unit operates, the corresponding hot water distribution valve 32 opens to supply water to that branch unit for heating. A differential pressure bypass control valve 33 is installed between the hot water supply pipe and the return pipe to maintain a constant pressure difference between the supply and return pipes, ensuring that the start and stop of each concentration and separation processing unit does not affect the overall hot water pipeline circulation and heating.

[0051] The refrigeration compression cycle unit includes a compressor 4, a refrigerant hot coil 41, a subcooling regulator 42, an expansion valve 43, a refrigerant cold coil 44, and a gas-liquid separator 45. This unit recovers the heat of secondary steam condensation generated by the concentration and separation treatment unit through the reverse Carnot cycle principle, which is used to heat the hot water in the water tank 3. A subcooling regulator 42 is set between the refrigerant hot coil 41 and the expansion valve 43 to cool the refrigerant with air to ensure the normal operation of the refrigeration cycle.

[0052] The heat recovery and vacuum generation unit includes a steam condenser 5, a condensate circulation pump 51, a condensate circulation valve 52, a condensate discharge valve 53, a spray head 54, a water level gauge 55, a water baffle 56, and a vacuum pump 57. The steam condenser 5 contains condensate at a certain level. The condensate is circulated and sprayed through the condensate circulation pump 51, the condensate circulation valve 52, and the spray head 54, directly absorbing secondary steam. The water level gauge 55 controls the condensate discharge valve 53 to discharge excess condensate. The vacuum pump 57 extracts excess gas from the concentration separation tank 2 and the steam condenser 5 to maintain a constant vacuum. The water baffle 56 is located at the vacuum pump's suction port to prevent spray water droplets from being sucked into the vacuum pump 57.

[0053] The solar thermal utilization unit includes a solar collector 6, a solar water pump 61, a solar hot water storage tank 62, a preheating circulation pump 63, and a preheating heat exchanger 64. The solar collector 6 is heated by the solar water pump 61, and the heat is stored in the solar hot water storage tank 62. In the initial stage of the concentration and separation processing unit, before secondary steam is generated in the sensible heat rise stage of the dilute material, the hot water in the solar hot water storage tank 62 heats the circulating condensate in the heat recovery and vacuum generation unit through the preheating circulation pump 63 and the preheating heat exchanger 64, providing heat to the refrigeration and compression circulation unit to ensure the normal operation of the system.

[0054] Example 2

[0055] like Figure 2 As shown, in the alternative scheme of the multi-color printing press water-based ink cleaning water zero-discharge color separation concentration and recycling device of this application, the solar collector in the solar thermal utilization unit can be replaced with a solar photovoltaic module 6b, and the solar water pump can be replaced with an electric heating element 61b. The solar photovoltaic power generation is used to heat the water in the solar hot water storage tank, and the surplus solar photovoltaic power generation can also be used to meet part of the device's power demand. The refrigerant heating coil in the refrigeration compression cycle unit can be replaced with a heat exchanger 41b, and a heating water pump 46b is added. Other settings and working processes are the same as in Embodiment 1.

[0056] This application utilizes independently set recovery branches for each color roller, automatically identifies the color of each branch, and switches the path accordingly to intelligently recover each single-color ink to the corresponding concentration and separation tank. This achieves color-based concentration processing, enhances the utilization value of water-based ink cleaning water, and eliminates the need for manual labor and on-site monitoring. This application employs a single heat source device, with multiple concentration and separation tanks operating in parallel and hot water pipeline valves allowing for flexible switching to adapt to the number of connected tanks. A differential pressure bypass control valve ensures the flow stability of each parallel branch. Furthermore, the centralized heat source device used in this application comprehensively considers energy-saving and efficiency-enhancing methods such as solar energy and efficient steam absorption via spraying, significantly reducing energy consumption and processing costs.

[0057] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A zero-discharge color separation, concentration, and recycling device for water-based ink cleaning water in multi-color printing presses, characterized in that, The zero-discharge color separation, concentration, and reuse device for water-based ink cleaning water in a multi-color printing press includes one or more parallel water-based ink color separation, collection, and automatic distribution units; one or more parallel concentration and separation processing units; a circulating hot water distribution unit; a refrigeration and compression circulation unit; a heat recovery and vacuum generation unit; and a solar thermal utilization unit. The water-based ink color separation and collection automatic distribution unit includes a cleaning water receiving hopper, a cleaning water lifting pump, a cleaning water storage tank, and a feeding stop valve connected in sequence, an automatic color recognition control device connected to the feeding stop valve, a cleaning water feeding pump connected to the automatic color recognition control device, and one or more feeding distribution valves connected to the cleaning water feeding pump. The concentration and separation processing unit includes a concentration and separation tank connected to each of the feeding and distribution valves; The circulating hot water distribution unit includes a heating water tank, and the water supply pipeline of the heating water tank is connected to the concentration and separation tank of the concentration and separation treatment unit through a corresponding hot water distribution valve; The refrigeration compression cycle unit includes a compressor, a refrigerant hot coil, and a refrigerant cold coil connected in sequence. The refrigerant hot coil is installed in the heating water tank of the circulating hot water distribution unit, and the refrigerant cold coil is installed in the steam condenser of the heat recovery and vacuum generation unit. The heat recovery and vacuum generation unit includes the steam condenser, and the steam discharge pipeline of the concentration and separation tank of the concentration and separation processing unit is connected to the steam condenser. The solar thermal utilization unit includes a solar collector, a solar hot water storage tank, and a preheating heat exchanger connected in sequence. A solar water pump is installed on the pipeline connecting the solar collector and the solar hot water storage tank, and a preheating circulation pump is installed on the pipeline connecting the preheating heat exchanger and the solar hot water storage tank. The preheating heat exchanger is connected to the steam condenser of the heat recovery and vacuum generation unit.

2. The zero-discharge color separation, concentration, and reuse device for water-based ink cleaning water in multi-color printing presses according to claim 1, characterized in that, The concentration and separation tank is equipped with a heating coil, a stirring motor, stirring blades, a defoamer, a discharge valve, and a steam vent valve.

3. The zero-discharge color separation, concentration, and reuse device for water-based ink cleaning water in multi-color printing presses according to claim 1, characterized in that, A subcooling regulator and an expansion valve are sequentially installed on the pipeline connecting the refrigerant hot coil and the refrigerant cold coil, and a gas-liquid separator is installed on the pipeline connecting the refrigerant cold coil and the compressor.

4. The zero-discharge color separation, concentration, and reuse device for water-based ink cleaning water in multi-color printing presses according to claim 1, characterized in that, A spray head is provided at the top of the steam condenser. A condensate circulation pump and a condensate circulation valve are sequentially provided on the water outlet pipeline at the bottom of the spray head and the pipeline connected to the spray head. The condensate circulation pump is also connected to the condensate discharge valve. The steam condenser is connected to a vacuum pump. A water baffle is provided at the vacuum pump's air intake.

5. The zero-discharge color separation, concentration, and reuse device for water-based ink cleaning water in multi-color printing presses according to claim 1, characterized in that, A differential pressure bypass control valve is installed between the hot water supply pipe and the return pipe of the circulating hot water distribution unit.

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