Textile printing and dyeing wastewater and waste gas resourceful treatment and waste heat recycling system

Abstract

The present application relates to a kind of textile printing and dyeing wastewater waste gas resource processing and waste heat recycling system, including wind light dual-energy power supply heating system, dust evaporator, condenser, secondary evaporator, steam heater;Dust evaporator is used for waste gas dust removal and wastewater evaporation;Condenser is used to make with high-temperature high-concentration dyeing wastewater counter-current heat exchange after dust removal waste heat condensation distilled water, the distilled water formed and the cooling water generated are recycled for dyeing water washing;High-temperature high-concentration dyeing wastewater after heating enters secondary evaporator and forms steam;Steam heater adopts wind light dual-energy power supply heating system to provide heat source for secondary evaporator, and the steam discharged by secondary evaporator is heated to form superheated steam, and the superheated steam is used as the heat source of secondary evaporator and is used for setting machine / curing machine;The present application uses clean energy and waste heat to supply heat, wastewater waste gas waste heat is treated cooperatively, and heat energy and water are closed-loop circulation, realize the dye recovery in dyeing wastewater, save resources while reducing carbon emissions.

Description

Technical Field

[0001] This invention relates to the field of clean energy and waste resource utilization, specifically a wastewater and waste gas resource utilization and waste heat recycling system for textile printing and dyeing. Background Technology

[0002] The textile printing and dyeing industry is both a vital industry for people's livelihood and is also considered a heavily polluting industry. It not only discharges large amounts of colored wastewater but also emits large amounts of waste heat gas containing dust; it is both a major polluter and a major energy consumer.

[0003] For waste heat gas containing dust, some waste heat is usually recovered through a heat exchanger and then discharged after being removed by an electrostatic precipitator. For textile dyeing wastewater, coagulation sedimentation + biological treatment is generally used to meet discharge standards, but the water quality, quantity and temperature vary greatly, which increases the difficulty and cost of the treatment process. It is also very common to use heat exchangers to recover some waste heat for high-temperature dyeing wastewater, but pollutants easily accumulate on the surface of the heat exchanger, requiring frequent cleaning and seriously affecting the heat exchange efficiency.

[0004] Achieving zero emissions of wastewater and waste heat from textile printing and dyeing plants using clean energy remains a research hotspot in the industry. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a system for the resource-based treatment of textile dyeing and printing wastewater and waste gas and the recycling of waste heat.

[0006] To solve the above technical problems, the present invention adopts the following technical solution:

[0007] A system for the resource-based treatment and waste heat recycling of textile printing and dyeing wastewater and waste gas includes a wind and solar dual-energy power supply and heating system, a dust removal evaporator, a condenser, a secondary evaporator, and a steam heater.

[0008] The input end of the dust collector evaporator is connected to the waste heat exhaust gas output end of the heat setting machine / baking machine and the wastewater output end of the dyeing machine. High-concentration, high-temperature dyeing wastewater enters the filter bag inside the dust collector evaporator from the top, and the waste heat exhaust gas enters from the bottom. They are directly mixed, exchanged for heat, and humidified in a counter-current manner. After double dust removal by the filter bag and water curtain inside the dust collector evaporator, purified water vapor and heated high-concentration, high-temperature wastewater are obtained. The purified water vapor is transported to the condenser by the dust collector evaporator. The condensate and cooling water obtained after condensation can be used for dyeing and washing in the dyeing machine. The heated high-concentration, high-temperature wastewater is transported to the secondary evaporator by the dust collector evaporator for reheating to form superheated steam. Part of the superheated steam is transported to the steam heater as the heat source of the secondary evaporator, and the other part is transported to the heat setting machine, baking machine, or dyeing machine for use. The steam heater uses a wind and solar dual-energy power supply and heating system to provide heat source for the secondary evaporator.

[0009] Furthermore, the wind and solar dual-energy power supply and heating system includes a light-absorbing and heat-concentrating solar collector and a wind-collecting cyclone vertical axis wind power generation system arranged sequentially from top to bottom; the light-absorbing and heat-concentrating solar collector includes a flat-plate light-absorbing solar collector and a semi-cylindrical heat-concentrating solar collector; the wind-collecting cyclone vertical axis wind power generation system includes a wind-collecting cyclone cover and a wind turbine.

[0010] Furthermore, the dust collector evaporator is equipped with a drain pipe, an aeration pipe, filter bags, a three-dimensional defoaming mesh made of glass fiber filaments, a spray pipe, and an exhaust pipe. The spray pipe is located at the top of the dust collector evaporator, and the input end of the dust collector evaporator is connected to the spray pipe. Multiple filter bags are suspended vertically in parallel below the spray pipe, and the outlet of the spray pipe is located at the top of the filter bags. The aeration pipe is located inside the filter bags at the bottom. A drain valve is located at the bottom of the dust collector evaporator. A three-dimensional defoaming mesh made of glass fiber filaments is installed at the top outlet of the dust collector evaporator above the spray pipe. The three-dimensional defoaming mesh made of glass fiber filaments is used to break the foam generated by the cross-flow contact between the waste heat exhaust gas from the heat setting machine and the baking machine and the high-temperature, high-concentration dyeing wastewater sprayed downwards from the spray pipe. The hot air output end of the light-absorbing heat collector and the waste heat exhaust gas output end of the heat setting machine / baking machine are both connected to the aeration pipe.

[0011] Furthermore, the glass fiber filament three-dimensional debubbling mesh is a 10-50 mesh double-layer glass fiber filament fabric.

[0012] Furthermore, the steam heater uses a wind and solar dual-energy power supply system or a gas heater to provide a heat source for the secondary evaporator. The steam heater is used to heat the steam discharged from the secondary evaporator and form superheated steam.

[0013] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0014] This invention combines baghouse dust collection and water curtain dust collection. It utilizes high-temperature, high-concentration dyeing wastewater containing alkali and surfactants to remove oil and dust from the waste heat exhaust gas discharged from the heat setter or baking machine. The waste heat from the exhaust gas discharged from the heat setter or baking machine is used to cross-flow heat the high-temperature, high-concentration dyeing wastewater and partially distill it. The resulting distilled water and cooling water are reused for dyeing washing. Clean energy is used to provide heat energy to further heat the remaining heated high-temperature, high-concentration dyeing wastewater to form superheated steam, which is then reused in the heat setter, baking machine, or dyeing machine. This constructs a closed-loop circulation system for heat energy and water in the printing and dyeing plant, achieving low carbon emissions, energy saving, and zero wastewater discharge.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 Waste gas and wastewater resource utilization system and waste heat recycling system for textile printing and dyeing plants;

[0017] Figure 2 3D schematic diagram of a wind and solar dual-energy power supply and heating system;

[0018] Figure 3 Light-absorbing and heat-collecting - Main view of a concentrating solar collector;

[0019] Figure 4 Light-absorbing and heat-collecting - top view of a concentrating solar collector;

[0020] Figure 5 3D view of a light-absorbing and heat-collecting solar collector;

[0021] Figure 6 Front view of a vertical axis wind power generation system with a cyclone-type wind collector;

[0022] Figure 7 Top view of a vertical axis wind power generation system with a cyclone-type wind collector;

[0023] Figure 8 3D diagram of a vertical axis wind power generation system with a cyclone-type wind collector;

[0024] Figure 9 Front view of the dust collector evaporator structure;

[0025] Figure 10 3D schematic diagram of the dust collector evaporator structure;

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1. Wind and solar dual-energy power supply and heating system;

[0028] 1-1. Light-absorbing heat collection - concentrating solar collector;

[0029] 1-1-1. Solar collector plate; 1-1-2. Concentrating solar collector;

[0030] 1-2. Vertical axis wind power generation system with wind-collecting cyclones;

[0031] 1-2-1. Wind-collecting cyclone cover; 1-2-2. Wind turbine;

[0032] 2. Dust-removing evaporator;

[0033] 2-1. Drainage pipe; 2-2. Aeration pipe;

[0034] 2-3. Cloth bags; 2-4. Spray pipes;

[0035] 2-5. Three-dimensional debubbling mesh made of long glass fiber filaments; 2-6. Exhaust pipe;

[0036] 3. Condenser;

[0037] 4. Secondary evaporator;

[0038] 5. Steam heater. Detailed Implementation

[0039] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0041] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] like Figure 1 As shown, a wastewater and waste gas resource utilization and waste heat recycling system for textile printing and dyeing is characterized by comprising a wind-solar dual-energy power supply and heating system 1, a dust removal evaporator 2, a condenser 3, a secondary evaporator 4, and a steam heater 5. The wind-solar dual-energy power supply and heating system 1 provides a heat source for wastewater evaporation. The dust removal evaporator 2 is used for waste gas dust removal and wastewater evaporation. The condenser 3 uses tap water for heat exchange to condense the waste heat from the setting machine or baking machine after counter-current heat exchange and dust removal with high-temperature, high-concentration dyeing wastewater, forming distilled water. The resulting distilled water and cooling water are reused for dyeing washing and wastewater recycling. The wastewater meets emission standards; after being heated by the waste heat from the stenter or baking machine in the dust removal evaporator 2, the high-temperature and high-concentration dyeing wastewater enters the secondary evaporator 4 for further heating to form steam; the steam heater 5 uses clean energy provided by the wind and solar dual-energy power supply and heating system to provide heat source for the secondary evaporator 4, heating the steam discharged from the secondary evaporator 4 to form superheated steam. Part of this superheated steam is used as the heat source for the secondary evaporator, and the other part is used for the stenter or baking machine; by using clean energy and waste heat to provide heat energy, the waste heat and wastewater are recycled and reused while removing dust from the waste gas and pollutants from the water;

[0043] like Figure 2-8 As shown, the wind and solar dual-energy power supply and heating system 1 includes a light-absorbing and heat-concentrating solar collector 1-1 and a wind-collecting cyclone vertical axis wind power generation system 1-2; the light-absorbing and heat-concentrating solar collector 1-1 includes a flat-plate light-absorbing solar collector 1-1-1 and a semi-cylindrical heat-concentrating solar collector 1-1-2; the wind-collecting cyclone vertical axis wind power generation system 1-2 includes a wind-collecting cyclone shroud 1-2-1 constructed from the flat-plate light-absorbing solar collector and a wind turbine 1-2-2;

[0044] like Figure 9-10As shown, the dust collector evaporator 2 is equipped with a drain pipe 2-1, an aeration pipe 2-2, a filter bag 2-3, a spray pipe 2-4, a glass fiber filament three-dimensional defoaming net 2-5, and an exhaust pipe 2-6. The aeration pipe 2-2 is located at the bottom of the dust collector evaporator 2. The spray pipe 2-4 is located at the top of the dust collector evaporator 2 and is used to spray high-temperature, high-concentration dyeing wastewater downwards. A filter bag 2 is installed above the aeration pipe 2-2. -3 and glass fiber filament three-dimensional defoaming net 2-5; the bottom of the dust removal evaporator 2 is provided with a drain valve 2-1; the glass fiber filament three-dimensional defoaming net 2-5 is used to defoam a large amount of foam generated by the cross-flow contact between the waste heat exhaust gas of the heat setting machine and the baking machine and the high temperature and high concentration dyeing wastewater sprayed downward by the spray pipe 2-4; the hot air output from the light absorption heat collection-concentrating heat collector 1-1 or the waste heat exhaust gas of the heat setting machine and the baking machine is connected to the aeration pipe 2-2;

[0045] The secondary evaporator 4 uses superheated steam as a heat source to evaporate the heated high-temperature and high-concentration dyeing wastewater into saturated steam, preventing scaling and corrosion.

[0046] The steam heater 5 uses clean energy provided by the wind and solar dual-energy power supply and heating system 1 to provide heat source for the secondary evaporator 4, heating the steam discharged from the secondary evaporator 4 to form superheated steam; it can also be heated by the gas heater 5, and the exhaust gas generated by the gas heater 5 is also directly introduced into the dust removal evaporator 2. Part of the superheated steam is used as the heat source for the secondary evaporator 4, and the other part is used for the setting machine or baking machine.

[0047] The working process of this invention is as follows: The waste heat exhaust gas discharged from the heat setting machine or baking machine enters the bag filter 2-3 through the aeration pipe 2-2 at the bottom of the dust removal evaporator 2. It is directly mixed, heat exchanged and humidified in the dust removal evaporator 2 with the high-concentration, high-temperature wastewater discharged from the dyeing machine sprayed from the spray pipe 2-4 at the top of the dust removal evaporator 2. After being doubly dusted by the bag filter 2-3 and the water curtain, it is discharged into the condenser 3 through the top exhaust pipe 2-6 through the glass fiber three-dimensional defoaming net 2-5 at the top of the dust removal evaporator 2. The purified and cooled exhaust gas is discharged from the top of the condenser 3. The cooling water and distilled water formed in the condenser 3 are reused in the production process. The heated high-concentration, high-temperature wastewater is discharged into the secondary evaporator 4 through the drain pipe 2-1 at the bottom of the dust removal evaporator 2. The saturated steam generated by the secondary evaporator 4 is further heated by the steam heater 5. The process generates superheated steam, part of which is used as a heat source for the secondary evaporator 4, and the other part is used to power the heat setter, baking machine, or dyeing machine. Its working principle combines baghouse dust collection and water curtain dust collection, utilizing high-temperature, high-concentration dyeing wastewater containing alkali and surfactants to remove oil and dust from the waste heat exhaust gas discharged from the heat setter or baking machine. The waste heat from the exhaust gas discharged from the heat setter or baking machine is used to cross-flow heat the high-temperature, high-concentration dyeing wastewater and partially distill it. The resulting distilled water and cooling water are reused for dyeing washing. Clean energy is used to provide heat energy to further heat the remaining heated high-temperature, high-concentration dyeing wastewater to form superheated steam, which is then reused in the heat setter, baking machine, or dyeing machine. This constructs a closed-loop circulation system for heat and water in the dyeing and printing plant, achieving low carbon emissions, energy saving, and zero wastewater discharge.

[0048] The above description provides examples of the preferred embodiments of the present invention. Parts not detailed herein are common knowledge to those skilled in the art. The scope of protection of the present invention is determined by the claims. Any equivalent modifications based on the technical teachings of the present invention are also within the scope of protection of the present invention.

Claims

1. A system for the resource-based treatment and waste heat recycling of textile dyeing and printing wastewater and waste gas, characterized in that, This includes a wind and solar dual-energy power supply and heating system, a dust removal evaporator, a condenser, a secondary evaporator, and a steam heater; The input end of the dust collector evaporator is connected to the waste heat exhaust gas output end of the heat setting machine / baking machine and the wastewater output end of the dyeing machine. High-concentration, high-temperature dyeing wastewater enters the filter bags inside the dust collector evaporator from the top, and the waste heat exhaust gas enters from the bottom. They are directly mixed, exchanged for heat, and humidified in a counter-current manner. After double dust removal by the filter bags and water curtain inside the dust collector evaporator, purified water vapor and heated high-concentration, high-temperature wastewater are obtained. The purified water vapor is transported to the condenser by the dust collector evaporator. The condensate and cooling water obtained after condensation can be used for dyeing and washing in the dyeing machine. The heated high-concentration, high-temperature wastewater is transported to the secondary evaporator by the dust collector evaporator for reheating to form superheated steam. Part of the superheated steam is transported to the steam heater as the heat source for the secondary evaporator, and the other part is transported to the heat setting machine, baking machine, or dyeing machine for use. The steam heater uses a wind and solar dual-energy power supply system to provide heat source for the secondary evaporator. The dust collector evaporator is equipped with a drain pipe, an aeration pipe, filter bags, a three-dimensional glass fiber defoaming net, a spray pipe, and an exhaust pipe. The spray pipe is located at the top of the dust collector evaporator, and the input end of the dust collector evaporator is connected to the spray pipe. Multiple filter bags are suspended vertically in parallel below the spray pipe, and the outlet of the spray pipe is located at the top of the filter bags. The aeration pipe is located inside the filter bags at the bottom. A drain valve is located at the bottom of the dust collector evaporator. A three-dimensional glass fiber defoaming net is located above the spray pipe at the top outlet of the dust collector evaporator. The three-dimensional glass fiber defoaming net is used to break the foam generated by the cross-flow contact between the waste heat exhaust gas from the heat setting machine and the baking machine and the high-temperature, high-concentration dyeing wastewater sprayed downwards from the spray pipe. The hot air output end of the light-absorbing heat collector and the waste heat exhaust gas output end of the heat setting machine / baking machine are both connected to the aeration pipe.

2. The textile dyeing and printing wastewater and waste gas resource utilization and waste heat recycling system according to claim 1, characterized in that, The wind and solar dual-energy power supply and heating system includes a light-absorbing and heat-concentrating solar collector and a wind-collecting cyclone vertical axis wind power generation system arranged sequentially from top to bottom; the light-absorbing and heat-concentrating solar collector includes a flat-plate light-absorbing solar collector and a semi-cylindrical heat-concentrating solar collector; the wind-collecting cyclone vertical axis wind power generation system includes a wind-collecting cyclone cover and a wind turbine.

3. The textile dyeing and printing wastewater and waste gas resource utilization and waste heat recycling system according to claim 1, characterized in that, The glass fiber filament three-dimensional debubbling mesh is a 10-50 mesh double-layer glass fiber filament fabric.

4. The textile dyeing and printing wastewater and waste gas resource utilization and waste heat recycling system according to claim 1, characterized in that, The steam heater uses a wind and solar dual-energy power supply system or a gas heater to provide a heat source for the secondary evaporator. The steam heater is used to heat the steam discharged from the secondary evaporator and form superheated steam.

Images