A kind of cloth printing and dyeing processing technology

Abstract

The invention relates to a fabric printing and dyeing processing technology in the field of fabric printing and dyeing, which specifically comprises the following steps: fabric pretreatment, scouring, desizing, wastewater heat recovery, after desizing wastewater and scouring wastewater are heat-exchanged to the same temperature through a heat stabilizing tube, the wastewater is input into a water storage tank or heat-exchanged with water in a water inlet pipe according to the unified temperature, and finally respectively input into two wastewater treatment devices for treatment; after the fluid input into the water inlet pipe is heat-exchanged, it is stored in a water storage tank to stabilize the temperature, and the water in the water storage tank is heated according to the stable temperature for scouring or desizing; dyeing, the dyeing wastewater is input into the printing and dyeing wastewater treatment equipment for treatment, the water stored in the water storage tank is used for temperature stabilization in the printing and dyeing wastewater treatment equipment, the scouring wastewater and the desizing wastewater are unified in temperature and then heat recovered, the wastewater with the unified temperature is used for heat preservation of the wastewater treatment equipment and preheating of process water, and the energy consumption of heating process water is saved.

Description

Technical Field

[0001] The invention relates to a fabric printing and dyeing processing technology, in particular to a fabric printing and dyeing processing technology applied to the field of fabric printing and dyeing processing. Background Art

[0002] Fabric printing and dyeing, the existing fabric printing and dyeing process usually requires the use of related dyeing liquid to dye the fabric, and most common dyeing liquids require water to complete the mixing.

[0003] In order to solve the problem of wastewater discharge during fabric printing and dyeing, a printing and dyeing wastewater treatment process in the market adopts a chemical reagent treatment design, which has a certain market share.

[0004] The Chinese invention patent CN117228906B specification discloses a printing and dyeing wastewater treatment process, which includes the following steps: S1: collecting wastewater and pre-treating it; the pre-treatment includes biochemical treatment, activated carbon treatment, resin softening treatment, and ultrafiltration treatment in sequence; the activated carbon treatment uses an activated carbon filter with an activated carbon medium, and the activated carbon medium includes at least one filter layer, and the filter layer includes a non-woven fabric frame layer and an activated carbon filter layer; S2: the pre-treated wastewater is sequentially treated with an RO membrane system and a nanofiltration system for salt separation and concentration; S3: the concentrated brine A is frozen and crystallized to obtain high-purity mirabilite, and the concentrated brine B is evaporated and crystallized before solid waste treatment. The treatment process of this application can achieve a higher COD removal rate for printing and dyeing wastewater and a higher regeneration rate for activated carbon, as well as the goal of achieving zero wastewater discharge.

[0005] Existing fabric printing and dyeing processing techniques often require desizing and scouring. These two steps often require the use of high-temperature water. The temperature of the wastewater discharged is also relatively high. The heat energy recovery rate of the wastewater generated by desizing and scouring in the current fabric printing and dyeing process is not high, which easily wastes heat energy. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the heat energy recovery rate of wastewater generated by desizing and scouring in the current cloth printing and dyeing process is not high, which easily wastes heat energy.

[0007] In order to solve the above problems, the present invention provides a fabric printing and dyeing processing process, which specifically includes the following steps:

[0008] S1, fabric pretreatment, detecting fabric defects, soaking the fabric to soften it, and removing dust and impurities on the surface;

[0009] S2, scouring, using scouring equipment to process fabrics and remove impurities from natural fibers. Water is input through the water inlet pipe during scouring. The scouring water temperature is T2, and the scouring wastewater is output; T2 includes 95-100°

[0010] S3, desizing, uses desizing equipment to process fabrics, removes the sizing added during weaving, and enhances the strength and wear resistance of the yarn; desizing water is input through the water inlet pipe, the desizing water temperature is T3, and the wastewater generated by desizing is discharged through the desizing wastewater output pipe; T3 is less than T2; T3 includes 50-90°C.

[0011] S4, wastewater heat recovery, after the desizing wastewater and scouring wastewater discharged each time are heat-exchanged to the same temperature through the heat stabilizing tube, their uniform temperature t is detected, if their uniform temperature t is higher than the temperature T1 required for water used in the printing and dyeing wastewater treatment equipment, the desizing wastewater and scouring wastewater are heat-exchanged with the water input from the water inlet pipe through the shell and tube heat exchanger until the temperature of the desizing wastewater and scouring wastewater are both reduced to T1, at which time the set amount of desizing wastewater and scouring wastewater is input into the water storage tank; the remaining desizing wastewater and scouring wastewater after input into the water storage tank are heat-exchanged with the water inlet pipe at the set flow rate, and then respectively input into two wastewater treatment devices for treatment;

[0012] If the uniform temperature t is less than T1, the desizing wastewater and the scouring wastewater are heat exchanged with the water inlet pipe at a set flow rate and then respectively input into two wastewater treatment devices for treatment;

[0013] S5, the fluid input from the water inlet pipe is stored in the water storage tank to a stable temperature after heat exchange, and the temperature of the fluid after stabilization is detected. If the fluid temperature is less than T3, the heater is used to heat the fluid output from the water inlet pipe to T3 and then used for desizing;

[0014] If the fluid temperature is greater than T3, the fluid output from the water inlet pipe is heated to T2 and then used for smelting;

[0015] S6, dyeing, use dyeing equipment to dye the cloth, and the dyeing wastewater is input into the printing and dyeing wastewater treatment equipment. The printing and dyeing wastewater treatment equipment includes an external insulation chamber. The external insulation chamber is equipped with wastewater treatment equipment and a water storage tank with a liquid pump. The temperature of the external insulation chamber is maintained at T1. The water is changed regularly to maintain the stable temperature of the equipment. The water storage tank is used to store water for temperature maintenance.

[0016] In the above-mentioned fabric printing and dyeing processing technology, heat energy is recovered from the wastewater generated by desizing and scouring, and the recovered heat energy is used for insulation of wastewater treatment equipment and preheating of process water, thereby effectively improving the utilization rate of heat energy.

[0017] As a further improvement of the present application, two groups of heat transfer tube banks for maintaining the temperature of the wastewater treatment equipment are laid in the outer insulation chamber, and two storage chambers are installed in the water storage tank, the two storage chambers are connected to the two groups of heat transfer tube banks, and the two storage chambers are used to store desizing wastewater and scouring wastewater respectively.

[0018] As a further improvement of the present application, the printing and dyeing wastewater treatment equipment is provided with a rated water flow rate and a rated water temperature, a drain pipe is installed at the output end of the heat transfer tube row, and a second heat exchanger is connected between the drain pipe and the water inlet pipe.

[0019] As a further improvement of the present application, the heat stabilizing tube includes an inner heat exchange tube, a pair of inner heat exchange tubes are surrounded by a plurality of outer heat exchange tubes, the inner heat exchange tube and the outer heat exchange tube are respectively connected to the desizing wastewater output pipe and the boiling wastewater output pipe, and a circulation pump is installed on the inner heat exchange tube and the outer heat exchange tube.

[0020] As another improvement of the present application, a pair of shell and tube heat exchangers is provided, and the pair of shell and tube heat exchangers are respectively used for heat exchange between desizing wastewater and scouring wastewater and inlet water of the water inlet pipe.

[0021] As another improvement supplement of the present application, the amount of water used for desizing and scouring is the same, and the waste water is discharged simultaneously after the desizing and scouring steps are completed.

[0022] As another improvement supplement to the present application, the water change time of the printing and dyeing wastewater treatment equipment is matched with the wastewater discharge time of the scouring and desizing operations; when the temperature of the wastewater discharged from the printing and dyeing wastewater treatment equipment is higher than the set value, this section of wastewater is used to heat the water inlet pipe; otherwise, the two groups of discharged wastewater are respectively input into two wastewater treatment devices.

[0023] As another improvement of the present application, a heating device is connected to the liquid pump, and the liquid pump is used for the circulation of the fluid in the heat transfer tube row. When the uniform temperature t of the wastewater is less than T1 and the temperature of the fluid in the heat transfer tube row drops to less than T1, the flowing fluid in the heat transfer tube row is driven to circulate, and the heating device works during the circulation, so that the fluid temperature is heated to T1 until the uniform temperature t of the wastewater is greater than or equal to T1.

[0024] As another improvement of the present application, it also includes a printing and dyeing wastewater control system, which includes a control terminal, and the control terminal is connected to a monitoring module, a data processing module, a control module and a data storage module; the liquid pump, the circulation pump and the heater are all connected to the control module signal, and the control module is used to control the fluid flow rate in the water inlet pipe, the heat stabilizing pipe and the shell and tube heat exchanger;

[0025] The printing and dyeing wastewater treatment equipment, the heat stabilizing tube and the shell and tube heat exchanger are all equipped with temperature sensors connected to the monitoring module signal;

[0026] The functions of the data processing module include calculating the inlet water flow rate required for the shell and tube heat exchanger to cool the wastewater to a set time.

[0027] In summary, this scheme can achieve heat recovery by unifying the temperature of the scouring wastewater and the desizing wastewater. The wastewater with uniform temperature is used for insulation of the wastewater treatment equipment and preheating of process water. On the one hand, it promotes the stability of the chemical reaction temperature in the wastewater treatment equipment, and on the other hand, it saves energy consumption for heating process water. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a process step diagram of the first embodiment of the present application;

[0029] Figure 2 This is a schematic diagram of the process wastewater treatment process of the first embodiment of the present application;

[0030] Figure 3 This is a working logic diagram of the first implementation mode of this application;

[0031] Figure 4 This is a three-dimensional diagram of a shell and tube heat exchanger according to the first embodiment of the present application;

[0032] Figure 5 This is a schematic diagram of the connection between the shell and tube heat exchanger and the heat stabilizing tube according to the first embodiment of the present application.

[0033] Description of the numbers in the figure:

[0034] 1 shell and tube heat exchanger, 2 heat stabilizing tube, 201 inner heat exchange tube, 202 outer heat exchange tube. DETAILED DESCRIPTION

[0035] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0036] The first implementation method:

[0037] Figure 1-5 A fabric printing and dyeing process is shown, which specifically includes the following steps:

[0038] S1, fabric pretreatment, detecting fabric defects, soaking the fabric to soften it, and removing dust and impurities on the surface;

[0039] S2, scouring, using scouring equipment to process fabrics and remove impurities from natural fibers. Water is input through the water inlet pipe during scouring. The scouring water temperature is T2, and the scouring wastewater is output; T2 includes 95-100°

[0040] S3, desizing, using desizing equipment to process fabrics, remove the sizing added during weaving, and enhance the strength and wear resistance of the yarn; desizing water is input through the water inlet pipe, the desizing water temperature is T3, and the wastewater generated by desizing is discharged through the desizing wastewater output pipe; T3 is less than T2; T3 includes 50-90°C; the amount of desizing water and scouring water is the same, and the wastewater is discharged simultaneously after the desizing and scouring steps are completed;

[0041] S4, wastewater heat recovery, after the desizing wastewater and scouring wastewater discharged each time are heat exchanged to the same temperature through the heat stabilizing tube 2, their uniform temperature t is detected, if their uniform temperature t is higher than the temperature T1 required for water used in the printing and dyeing wastewater treatment equipment, the desizing wastewater and scouring wastewater are heat exchanged with the water input from the water inlet pipe through the shell and tube heat exchanger 1, until the temperature of the desizing wastewater and scouring wastewater are both reduced to T1, at which time the set amount of desizing wastewater and scouring wastewater is input into the water storage tank; the remaining desizing wastewater and scouring wastewater after input into the water storage tank are heat exchanged with the water inlet pipe at the set flow rate, and then respectively input into two wastewater treatment devices for treatment;

[0042] If the uniform temperature t is less than T1, the desizing wastewater and the scouring wastewater are heat exchanged with the water inlet pipe at a set flow rate and then respectively input into two wastewater treatment devices for treatment;

[0043] S5, the fluid input from the water inlet pipe is stored in the water storage tank to a stable temperature after heat exchange, and the temperature of the fluid after stabilization is detected. If the fluid temperature is less than T3, the heater is used to heat the fluid output from the water inlet pipe to T3 and then used for desizing;

[0044] If the fluid temperature is greater than T3, the fluid output from the water inlet pipe is heated to T2 and then used for smelting;

[0045] S6, dyeing, use dyeing equipment to dye the cloth, and the dyeing wastewater is input into the printing and dyeing wastewater treatment equipment. The printing and dyeing wastewater treatment equipment includes an external insulation chamber. The external insulation chamber is equipped with wastewater treatment equipment and a water storage tank with a liquid pump. The temperature of the external insulation chamber is maintained at T1. The water is changed regularly to maintain the stable temperature of the equipment. The water storage tank is used to store water for temperature maintenance.

[0046] Two groups of heat transfer tubes are laid in the outer insulation chamber for maintaining the temperature of the wastewater treatment equipment, and two storage chambers are arranged in the water storage tank, the two storage chambers are connected to the two groups of heat transfer tubes, and the two storage chambers are used to store desizing wastewater and scouring wastewater respectively.

[0047] The heat stabilizing tube 2 includes an inner heat exchange tube 201, and a pair of inner heat exchange tubes 201 are surrounded by multiple outer heat exchange tubes 202. The inner heat exchange tube 201 and the outer heat exchange tube 202 are respectively connected to the desizing wastewater output pipe and the scouring wastewater output pipe, and the inner heat exchange tube 201 and the outer heat exchange tube 202 are both installed with a circulation pump.

[0048] The shell and tube heat exchanger 1 is arranged as a pair, and the shell and tube heat exchanger 1 is used for heat exchange between the desizing wastewater and the scouring wastewater and the inlet water of the water inlet pipe respectively.

[0049] When the present embodiment is working, the desizing wastewater and the scouring wastewater are heat exchanged through the heat stabilizing tube 2, so that the heat exchange temperature of the desizing wastewater and the scouring wastewater is consistent. After the uniform temperature t of the two is detected, if t is higher than the temperature T1 required for water used in the printing and dyeing wastewater treatment equipment, the desizing wastewater and the scouring wastewater are respectively input into the two shell and tube heat exchangers 1 and heat exchanged with the water inlet pipe. At this time, the water inlet flow rate of the water inlet pipe is regulated to ensure that the temperature of the desizing wastewater and the scouring wastewater will not drop below T1. After the desizing wastewater and the scouring wastewater are output from the shell and tube heat exchanger 1, the temperature is close to T1. At this time, the desizing wastewater and the scouring wastewater are input into the water storage tank for heat preservation of the chemical reaction end in the printing and dyeing wastewater treatment equipment. The temperature of the chemical reaction end in the printing and dyeing wastewater treatment equipment is stabilized by inputting a fluid of a specified temperature into the printing and dyeing wastewater treatment equipment (the wastewater output by S6 dyeing enters the chemical reaction end of the printing and dyeing wastewater treatment equipment).

[0050] When the uniform temperature t is lower than T1, both types of wastewater are used for preheating the inlet pipe.

[0051] Second implementation method:

[0052] Figure 1-3 As shown, it also includes a printing and dyeing wastewater control system, which includes a control terminal, to which a monitoring module, a data processing module, a control module and a data storage module are connected; the liquid pump, the circulation pump and the heater are all connected to the control module signal, and the control module is used to control the fluid flow rate in the water inlet pipe, the heat stabilizing tube 2 and the shell and tube heat exchanger 1;

[0053] The printing and dyeing wastewater treatment equipment, the heat stabilizing tube 2 and the shell and tube heat exchanger 1 are all provided with temperature sensors connected to the monitoring module signal;

[0054] The function of the data processing module includes calculating the water inlet flow rate required for the shell and tube heat exchanger 1 to cool the wastewater to a set time.

[0055] The printing and dyeing wastewater treatment equipment is provided with a rated water flow and a rated water temperature. The rated water temperature is T1. A drain pipe is installed at the output end of the heat transfer tube row. A second heat exchanger is connected between the drain pipe and the water inlet pipe. The second heat exchanger uses the discharged water of the heat transfer tube row to preheat the water inlet pipe.

[0056] The water change time of the printing and dyeing wastewater treatment equipment matches the wastewater discharge time of the scouring and desizing operations; when the temperature of the wastewater discharged from the printing and dyeing wastewater treatment equipment is higher than the set value, this section of wastewater is used to heat the water inlet pipe; otherwise, the two groups of discharged wastewater are respectively input into two wastewater treatment devices.

[0057] In this embodiment, when the drainage temperature of the printing and dyeing wastewater treatment equipment is high, the drainage can also be used to preheat the water inlet pipe, further improving the utilization rate of thermal energy.

[0058] A heating device is connected to the liquid pump, and the liquid pump is used for the circulation of the fluid in the heat transfer tube row. When the uniform temperature t of the wastewater is less than T1 and the temperature of the fluid in the heat transfer tube row drops to less than T1, the flowing fluid in the heat transfer tube row is driven to circulate, and the heating device works during the circulation, so that the fluid temperature is heated to T1 until the uniform temperature t of the wastewater is greater than or equal to T1.

[0059] When the wastewater temperature is low for a long time, the fluid in the printing and dyeing wastewater treatment equipment is heated by a liquid pump to ensure the stability of the temperature at the chemical reaction end of the printing and dyeing wastewater treatment equipment until the recycled wastewater with sufficient temperature is supplied to the printing and dyeing wastewater treatment equipment.

[0060] In summary, this scheme can achieve heat recovery by unifying the temperature of the scouring wastewater and the desizing wastewater. The wastewater with uniform temperature is used for insulation of the wastewater treatment equipment and preheating of process water. On the one hand, it promotes the stability of the chemical reaction temperature in the wastewater treatment equipment, and on the other hand, it saves energy consumption for heating process water.

[0061] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A fabric printing and dyeing process, characterized in that: The specific steps include: S1, fabric pretreatment, detecting fabric defects, soaking the fabric to soften it, and removing dust and impurities on the surface; S2, scouring, using scouring equipment to process fabrics and remove impurities from natural fibers. Water is input through the water inlet pipe during scouring. The scouring water temperature is T2, and scouring wastewater is output; S3, desizing, using desizing equipment to process fabrics, remove the sizing added during weaving, and enhance the strength and wear resistance of the yarn; desizing water is input through the water inlet pipe, the desizing water temperature is T3, and the wastewater generated by desizing is discharged through the desizing wastewater output pipe; T3 is less than T2; the desizing water and scouring water have the same amount, and the wastewater is discharged simultaneously after the desizing and scouring steps are completed; S4, wastewater heat recovery, after the desizing wastewater and scouring wastewater discharged each time are heat exchanged through the heat stabilizing tube (2) until the temperature is the same, the uniform temperature t is detected. If the uniform temperature t is higher than the temperature T1 required for water used in the printing and dyeing wastewater treatment equipment, the desizing wastewater and scouring wastewater are heat exchanged with water input from the water inlet pipe through the shell and tube heat exchanger (1) until the temperature of the desizing wastewater and scouring wastewater is reduced to T1. At this time, a set amount of desizing wastewater and scouring wastewater is input into the water storage tank; the remaining desizing wastewater and scouring wastewater after input into the water storage tank is heat exchanged with the water inlet pipe at a set flow rate, and then respectively input into two wastewater treatment devices for treatment; If the uniform temperature t is less than T1, the desizing wastewater and the scouring wastewater are heat exchanged with the water inlet pipe at a set flow rate and then respectively input into two wastewater treatment devices for treatment; S5, the fluid input from the water inlet pipe is stored in the water storage tank to a stable temperature after heat exchange, and the temperature of the fluid after stabilization is detected. If the fluid temperature is less than T3, the heater is used to heat the fluid output from the water inlet pipe to T3 and then used for desizing; If the fluid temperature is greater than T3, the fluid output from the water inlet pipe is heated to T2 and then used for smelting; S6, dyeing, using dyeing equipment to dye the fabric, the dyeing wastewater is input into the printing and dyeing wastewater treatment equipment, the printing and dyeing wastewater treatment equipment includes an external insulation chamber, the external insulation chamber is provided with a wastewater treatment equipment and a water storage tank with a liquid pump, the temperature of the external insulation chamber is maintained at T1, the water is changed regularly to maintain the temperature of the equipment stable, and the water storage tank is used to store water for temperature maintenance; Two groups of heat transfer pipes are laid in the outer insulation chamber for maintaining the temperature of the wastewater treatment equipment, and two storage chambers are arranged in the water storage tank, the two storage chambers are connected to the two groups of heat transfer pipes, and the two storage chambers are used to store desizing wastewater and scouring wastewater respectively; The liquid pump is connected to a heating device, and the liquid pump is used for circulating the fluid in the heat transfer tube row. When the uniform temperature t of the wastewater is less than T1 and the temperature of the fluid in the heat transfer tube row is reduced to less than T1, the fluid flowing in the heat transfer tube row is driven to circulate, and the heating device works during the circulation, so that the fluid temperature is heated to T1, until the uniform temperature t of the wastewater is greater than or equal to T1; It also includes a dyeing and printing wastewater control system, the dyeing and printing wastewater control system includes a control terminal, the control terminal is connected to a monitoring module, a data processing module, a control module and a data storage module; the liquid pump, the circulation pump and the heater are all connected to the control module signal, the control module is used to control the fluid flow rate in the water inlet pipe, the heat stabilizing tube (2) and the shell and tube heat exchanger (1); The printing and dyeing wastewater treatment equipment, the heat stabilizing tube (2) and the shell and tube heat exchanger (1) are all provided with temperature sensors connected to the monitoring module signal; The functions of the data processing module include calculating the water inlet flow rate required for the shell and tube heat exchanger (1) to cool the wastewater to a set time; The heat stabilizing tube (2) comprises an inner heat exchange tube (201), a pair of the inner heat exchange tubes (201) are surrounded by a plurality of outer heat exchange tubes (202), the inner heat exchange tubes (201) and the outer heat exchange tubes (202) are respectively connected to a desizing wastewater output pipe and a scouring wastewater output pipe, and a circulation pump is installed on the inner heat exchange tubes (201) and the outer heat exchange tubes (202); The shell and tube heat exchangers (1) are arranged as a pair, and the pair of shell and tube heat exchangers (1) are respectively used for heat exchange between desizing wastewater and scouring wastewater and water inlet pipe inlet water.

2. The fabric printing and dyeing process according to claim 1, characterized in that: The printing and dyeing wastewater treatment equipment is provided with a rated water flow rate and a rated water temperature. A drain pipe is installed at the output end of the heat transfer tube row, and a second heat exchanger is connected between the drain pipe and the water inlet pipe.

3. The fabric printing and dyeing process according to claim 1, characterized in that: The water changing time of the printing and dyeing wastewater treatment equipment matches the wastewater discharge time of the scouring and desizing operations; when the temperature of the wastewater discharged from the printing and dyeing wastewater treatment equipment is higher than the set value, the wastewater is used to heat the water inlet pipe; if not, the two groups of discharged wastewater are respectively input into two wastewater treatment devices.

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