CN111286895A - Energy-saving dyeing method for replacing steam with hot water in printing and dyeing plant - Google Patents
Energy-saving dyeing method for replacing steam with hot water in printing and dyeing plant Download PDFInfo
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- CN111286895A CN111286895A CN202010238091.8A CN202010238091A CN111286895A CN 111286895 A CN111286895 A CN 111286895A CN 202010238091 A CN202010238091 A CN 202010238091A CN 111286895 A CN111286895 A CN 111286895A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B3/00—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating
- D06B3/10—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating of fabrics
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B17/00—Storing of textile materials in association with the treatment of the materials by liquids, gases or vapours
- D06B17/02—Storing of textile materials in association with the treatment of the materials by liquids, gases or vapours in superimposed, i.e. stack-packed, form; J-boxes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B23/00—Component parts, details, or accessories of apparatus or machines, specially adapted for the treating of textile materials, not restricted to a particular kind of apparatus, provided for in groups D06B1/00 - D06B21/00
- D06B23/20—Arrangements of apparatus for treating processing-liquids, -gases or -vapours, e.g. purification, filtration, distillation
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B23/00—Component parts, details, or accessories of apparatus or machines, specially adapted for the treating of textile materials, not restricted to a particular kind of apparatus, provided for in groups D06B1/00 - D06B21/00
- D06B23/20—Arrangements of apparatus for treating processing-liquids, -gases or -vapours, e.g. purification, filtration, distillation
- D06B23/22—Arrangements of apparatus for treating processing-liquids, -gases or -vapours, e.g. purification, filtration, distillation for heating
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L1/00—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
- D06L1/12—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using aqueous solvents
- D06L1/16—Multi-step processes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/02—After-treatment
Abstract
The invention relates to an energy-saving dyeing method for replacing steam with blended hot water in a printing and dyeing factory, which uses waste heat to obtain high-temperature printing and dyeing water through heat exchange of a heat exchanger, or uses solar energy to heat to obtain high-temperature printing and dyeing water, and then the high-temperature printing and dyeing water is blended with normal-temperature water into various blended hot water with different temperatures according to a dyeing process; the grey cloth is pretreated and then is led into a dyeing device, and normal-temperature acid washing, medium-temperature water washing and normal-temperature water washing are sequentially carried out, so that the grey cloth pretreatment process is completed; and then, using deoxyenzyme to dye the grey cloth, draining water, adding hot water at 40 ℃ into a dyeing device, sequentially adding salt according to a dyeing process, adding a dyeing chemical according to a dyeing formula, heating to 60 ℃, carrying out level dyeing and heat preservation, confirming a sample, dyeing, and then cleaning to finish dyeing. The hot water converted from waste heat energy or solar energy is blended into the hot water with corresponding temperature according to the requirements of each dyeing process, thereby realizing that no steam is used in the whole dyeing process, improving the utilization efficiency of heat energy, saving energy and greatly reducing the production cost.
Description
Technical Field
The invention belongs to the technical field of textile environmental protection and energy conservation, and particularly relates to an energy-saving dyeing method for replacing steam with hot water in a printing and dyeing mill.
Background
Fabrics such as cloth need to be subjected to a plurality of treatment processes in the production process, and dyeing is an extremely important treatment process.
In the dyeing process, a plurality of steps are required to be heated, and the current printing and dyeing factories heat water in a dyeing device through steam and a heat exchanger on a dyeing machine and circulating water to reach the temperature required by the dyeing process so as to finish the dyeing process.
The existing dyeing process comprises a grey cloth pretreatment process and a grey cloth dyeing process, wherein the grey cloth pretreatment process is generally finished by a dyeing device, water, grey cloth and an auxiliary agent are added into the dyeing device, the temperature is raised to 98 ℃, boiling and bleaching are carried out for 40 minutes, a large amount of water vapor is consumed for maintaining the water temperature of 98 ℃, the energy consumption is high, and the pretreatment cost is extremely high.
In order to reduce the energy consumption of pretreatment, the prior art adopts a cold-batch pretreatment method to realize the pretreatment of the grey cloth, and after the grey cloth is rolled into a cold-batch pretreatment material, the grey cloth is rotatably stacked for at least 20 hours in a closed space with the heat preservation of 35 ℃ in cooperation with a rotary low-temperature pretreatment machine of CN104153138B until the cold-batch cloth has no upper and lower layer difference. And then acid washing and water washing are carried out to finish the pretreatment of the grey cloth, and the treatment process has the advantages of low energy consumption, low cost and long production period.
After the grey cloth dyeing process is carried out, the steps of dyeing steam heating and warming washing are still needed, the water is heated to the dyeing process requirement by using steam through a heat exchanger in the dyeing machine, the steam energy consumption is very high, the cost is high, and the requirements of energy conservation and cost reduction are not met.
Disclosure of Invention
The invention aims to provide an energy-saving dyeing method for replacing steam with hot water in a dyeing plant, which aims to solve the problems of high steam consumption, energy saving and cost reduction of the existing dyeing process.
The invention is realized by the following technical scheme:
an energy-saving dyeing method for replacing steam by adding hot water in a printing and dyeing mill comprises the following steps:
(1) preparing hot water mixing: heating the printing and dyeing water by using waste heat through a heat exchanger to obtain high-temperature printing and dyeing water, and preserving heat for storage;
blending high-temperature printing and dyeing water and normal-temperature water into N kinds of hot water with different temperatures according to a dyeing process, and storing the hot water in a heat-preservation and corrosion-prevention tank for later use, wherein N is a natural number;
or heating the printing and dyeing water by solar energy, directly blending the heated printing and dyeing water or the heated printing and dyeing water and normal-temperature water into one or more hot water with different temperatures according to a dyeing process, and storing the hot water in a heat-preservation and corrosion-prevention tank for later use;
(2) stacking treatment: placing the grey cloth which is rolled with the pretreatment auxiliary agent in a sealed space at 30-40 ℃ for stacking treatment for at least 20 h;
(3) pickling at normal temperature: guiding the piled grey cloth into a dyeing device, pickling for 20-30min by using a normal-temperature pickling solution, wherein the acid in the pickling solution is sulfuric acid or glacial acetic acid, the weight of the acid in the pickling solution is 0.5-1% of that of the grey cloth, and draining after pickling at normal temperature;
(4) washing with medium-temperature water: adding the grey cloth which is acid-washed at normal temperature into the hot water with the temperature of 30-60 ℃ blended in the step (1), washing for 10-20min, and then draining;
(5) washing with water at normal temperature: adding normal temperature water into the dyeing device, and washing with water for one or more times until the pH value of the discharged liquid is 6-7;
(6) dyeing preparation: adding hot water at 35-40 ℃ into the washed grey cloth, adding deoxyribonuclease to obtain enzyme removing liquid, and treating in the enzyme removing liquid for 20-30 min;
(7) dyeing treatment: adding the blended hot water of 40 ℃ in the step (1) into a dyeing device, adding salt with the amount required by the dyeing process, adding the blended dye according to the dyeing formula, heating to 60-65 ℃ by using a burner for auxiliary heating, adding alkali after uniform dyeing, keeping the temperature for a set time, and draining after sample checking;
(8) and (3) dyeing post-treatment: and (4) sequentially carrying out water washing and low-temperature soaping on the dyed grey cloth according to set process requirements to finish dyeing of the grey cloth.
Further, the waste heat source in step (1) includes, but is not limited to, industrial boiler waste steam, waste water or waste heat discharged by a tenter setting machine.
Further, a rotary low-temperature pretreatment machine is adopted for stacking treatment in the step (2).
Further, the temperature of the stacking treatment in the step (2) is 35 ℃, the stacking time is 20 hours, and the cold-piled grey cloth is ensured not to have upper and lower layer difference.
Further, the temperature of the medium-temperature water washing in the step (4) is 60 ℃, and the time of the medium-temperature water washing is 10 min.
Further, the cleaning is performed twice by using normal temperature water in the step (5).
Further, the enzyme removing liquid in the step (6) is prepared by adding oxygen removing enzyme accounting for 0.2-0.3% of the weight of the enzyme removing liquid into hot water at 40 ℃ blended in the step (1).
Further, in the step (6), the treatment temperature of the enzyme removing solution is 40 ℃, and the treatment time is 20 min.
Further, in the step (7), the auxiliary heating temperature rise speed of the burner is 1 ℃/min.
Further, adding alkali after the leveling and keeping the temperature for a set time, keeping the temperature and leveling at 60-65 ℃ for 15-30 minutes, adding dyeing substitution alkali and keeping the temperature for 25-60 minutes.
The invention has the beneficial effects that:
according to the energy-saving fabric dyeing method disclosed by the technical scheme, hot water recovered and stored by waste heat is blended into hot water with corresponding temperature, or clean energy such as solar energy is used for heating printing and dyeing water, and the correspondingly blended hot water is used according to the temperature requirements in each dyeing process, so that the whole dyeing process does not need steam, the energy is saved, the utilization efficiency of heat energy or the utilization rate of clean energy is improved, and the production cost is reduced.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
The technical scheme provides an energy-saving dyeing method for replacing steam with hot water in a printing and dyeing mill, which comprises the following steps:
preparing hot water: the method comprises the steps of preparing a large enough number of heat-preservation and corrosion-prevention water tanks to ensure the water consumption of a dyeing process, heating the printing and dyeing water by using waste gas of an industrial boiler such as a power plant through a heat exchanger, for example, heating the printing and dyeing water to 95 ℃, obtaining high-temperature printing and dyeing water and storing the high-temperature printing and dyeing water in the heat-preservation and corrosion-prevention water tanks.
In the technical scheme of the application, the solar heating printing and dyeing water can be used for the corresponding dyeing process, for example, the solar heating printing and dyeing water can be directly used in the process of dyeing, or can be used in the corresponding processes after being mixed with normal temperature water. Therefore, in the following examples of the present application, unless otherwise explicitly stated, the hot water for blending at each temperature is one of high-temperature printing water for converting waste heat (if the temperature is low, it can be used as it is in a range required by the printing process temperature), high-temperature printing water (if the temperature is higher than the printing process temperature), printing water heated by clean energy such as solar energy (if the temperature is in a range required by some printing process temperature), or hot water blended by printing water heated by clean energy such as solar energy and normal-temperature water, and will not be explicitly described later.
In the technical scheme of the application, the high temperature in the high-temperature printing and dyeing water is higher than the temperature required by the water temperature in the printing and dyeing process, is only relative temperature, and does not need to be clearly specified.
In the technical scheme of the application, the temperature of the heating printing and dyeing water can be lower than 95 ℃, all the water temperature which is higher than the water temperature in the dyeing process can be applied to the technical scheme of the application, and the difference is only the amount of the water blended with the normal temperature water.
Mixing the high-temperature printing and dyeing water and normal-temperature water according to dyeing process requirements to obtain hot water with different temperatures, such as 40 deg.C hot water, 60 deg.C hot water, etc., and storing in corresponding heat-insulating anticorrosive tanks.
This step is a key technology in the present application because, by this technical feature, no steam heating is used in the whole dyeing process, which is an essential difference from the existing dyeing production process.
Step (2): and (3) placing the grey cloth subjected to the rolling and cold-stacking pretreatment in a sealed space at 30-40 ℃ for stacking treatment for at least 20h to ensure that the cold-stacking grey cloth has no upper and lower layer difference. In the step (2), a rotary low-temperature pretreatment machine of CN104153138B can be adopted for stacking treatment.
In specific implementation, in order to ensure the effect of stacking treatment, the temperature of stacking treatment is 35 ℃, and the stacking time is 20 hours.
And (3): pickling at normal temperature: introducing the piled grey cloth into a dyeing device, pickling for 20-30min by using a normal-temperature pickling solution, wherein the acid in the pickling solution is sulfuric acid or glacial acetic acid, and the acid in the pickling solution is 0.5-1% of the weight percentage of the grey cloth, specifically, adding normal-temperature water into the dyeing device, adding 0.5-1% of acid by weight percentage of the grey cloth, obtaining the normal-temperature pickling solution, and draining after the normal-temperature pickling.
In the technical solution of the present application, the dyeing device may be a dyeing machine, a cylinder and open width dyeing line or other devices for dyeing, etc.
In specific implementation, normal temperature water is added into a dyeing device, sulfuric acid accounting for 0.5% of the weight of the grey cloth is added to obtain normal temperature pickling liquid, the normal temperature pickling time is 20min, and the washing liquid is drained after the pickling at the normal temperature. In the technical scheme of the application, the normal-temperature pickling step is the prior art, and other processes capable of pickling the stacked grey cloth are all suitable for the technical scheme of the application.
And (4): washing with medium-temperature water: and (3) adding the grey cloth which is subjected to normal-temperature acid washing into the hot water with the temperature of 30-60 ℃ blended in the step (1), and washing for 10-20 min. In specific implementation, the temperature of the medium-temperature water washing is 60 ℃, the time of the medium-temperature water washing is 10min, and then water is discharged.
And (5): washing with water at normal temperature: adding normal temperature water into the dyeing device, and washing with water for one or more times until the pH value of the discharged liquid is 6-7; in the practice of the present application, two times of washing with normal temperature water was carried out, and the pH of the effluent after washing was 7.
And (6): dyeing preparation: treating the cleaned grey cloth in enzyme removing liquid at 35-40 ℃ for 20-30 min; in specific implementation, the treatment temperature of the enzyme removing liquid is 40 ℃, and the treatment time is 20 min.
Adding the enzyme removing liquid into a dyeing device by using the hot water at 40 ℃ blended in the step (1), adding deoxyribozymes which account for 0.2-0.3% of the enzyme removing liquid by mass percent, and adding deoxyribozymes of 0.2% in specific implementation.
And (7): adding the blended hot water with the temperature of 40 ℃ in the step (1) into a dyeing device, adding salt according to the dyeing process requirement, wherein in the technical scheme, the added salt is industrial salt or anhydrous sodium sulphate, the adding amount of the salt is 10-50% of the weight of the grey cloth, adding the blended dye according to the dyeing formula, heating to 60-65 ℃ by using a burner for auxiliary heating, adding dyeing common substitute alkali accounting for 1-3% of the weight of the grey cloth after carrying out heat preservation and level dyeing for 15-30min, carrying out heat preservation for 25-60min, cooling to normal temperature and draining after confirming the sample.
The specific implementation process comprises the steps of adding blended hot water of 40 ℃ into a dyeing device, adding anhydrous sodium sulphate which accounts for 10% of the weight of the gray fabric, adding the formula dye, heating the solution in the dyeing device to 65 ℃ by using a burner in an auxiliary manner, wherein the heating rate of the burner in the auxiliary heating manner is 1 ℃/min, adding dyeing common substitution alkali which accounts for 1% of the weight of the gray fabric after heat preservation and leveling for 15min, preserving heat for 25min, confirming the sample, cooling to the normal temperature and discharging water.
In other embodiments of the application, blended 40 ℃ hot water is added into a dyeing device, anhydrous sodium sulphate accounting for 30% of the weight of the grey cloth is added, then the formula dye is added, a burner is used for assisting to heat the solution in the dyeing device to 65 ℃, the heating rate of the burner for assisting heating is 1 ℃/min, a dyeing common substitute alkali accounting for 2% of the weight of the grey cloth is added after the heat preservation and the uniform dyeing is carried out for 20min, the heat preservation is carried out for 40min, and after the sample confirmation, the temperature is reduced to the normal temperature and the water is drained.
Or adding blended 40 ℃ hot water into a dyeing device, adding anhydrous sodium sulphate accounting for 50% of the weight of the grey cloth, adding the formula dye, heating the solution in the dyeing device to 65 ℃ by using a burner, wherein the heating rate of the burner is 1 ℃/min, adding dyeing common substitute alkali accounting for 3% of the weight of the grey cloth after 30min of heat preservation and level dyeing, preserving heat for 50min, reducing the temperature to normal temperature after sample confirmation, and draining water.
The heat preservation level dyeing time and the heat preservation time can be correspondingly changed according to different dyeing requirements, and the realization of the technical scheme of the application is not influenced.
And (8): and (3) dyeing post-treatment: and (4) sequentially carrying out water washing and low-temperature soaping on the dyed grey cloth according to set process requirements to finish dyeing of the grey cloth. The water washing and the low-temperature soaping are the conventional washing after dyeing.
Examples
The experimental procedures used in the examples below are conventional unless otherwise specified, the materials and reagents used therein are commercially available, and the equipment used in the experiments are well known to those skilled in the art without otherwise specified.
Preparing hot water mixing: the printing and dyeing water is heated by using the waste heat steam of the boiler of the power plant through a heat exchanger, and the high-temperature printing and dyeing water heated to 95 ℃ is stored in a heat-preservation and corrosion-prevention storage tank.
Mixing the high-temperature printing and dyeing water in the heat-preservation and corrosion-prevention storage tank with normal-temperature water to form two kinds of hot water of 40 ℃ and 60 ℃, and respectively storing the hot water and the hot water in respective corrosion-prevention storage tanks with heat-preservation layers for dyeing production.
Stacking treatment: the grey cloth of the rolling cold-stacking pretreatment auxiliary agent is placed in a 35 ℃ rotary low-temperature pretreatment machine for rotary stacking treatment for 20 hours, so that no difference between the upper layer and the lower layer of the cold-stacking grey cloth is ensured.
Pickling at normal temperature: introducing the piled grey cloth into a dyeing device, adding normal temperature water, adding sulfuric acid accounting for 0.5 percent of the weight of the grey cloth to obtain normal temperature pickling solution, pickling for 20min at normal temperature, and discharging the pickling solution.
Washing with medium-temperature water: adding 60 deg.C water into dyeing device, washing in 60 deg.C hot water for 10min, and draining.
Washing with water at normal temperature: adding normal temperature water into the dyeing device for normal temperature cleaning, draining, performing normal temperature water cleaning again or for the third time, optimally selecting the pH value of the discharged liquid after cleaning to be 6.5, and draining.
Dyeing preparation: adding 40 deg.C hot water into dyeing device, adding 0.2 wt% deoxyenzyme into 40 deg.C hot water to obtain enzyme-removing liquid, treating at 40 deg.C for 20min, and draining.
Dyeing treatment: adding blended 40 ℃ hot water into a dyeing device, adding anhydrous sodium sulphate accounting for 10% of the weight of the grey cloth, adding the prepared dye according to a dyeing formula, heating to 65 ℃ by using a burner for auxiliary heating, heating at the heating rate of 1 ℃/min, adding 1% of dyeing substitute alkali accounting for 1% of the weight of the grey cloth after carrying out heat preservation and uniform dyeing for 15min, carrying out heat preservation for 25min, cooling to normal temperature after sample checking, and draining.
And (3) dyeing post-treatment: and (4) carrying out normal-temperature water washing and low-temperature soaping on the dyed grey cloth according to a conventional process in sequence to finish dyeing of the grey cloth.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. An energy-saving dyeing method for replacing steam with hot water in a printing and dyeing mill is characterized by comprising the following steps:
(1) preparing hot water mixing: heating the printing and dyeing water by using waste heat through a heat exchanger to obtain high-temperature printing and dyeing water, and preserving heat for storage;
blending high-temperature printing and dyeing water and normal-temperature water into N kinds of hot water with different temperatures according to a dyeing process, and storing the hot water in a heat-preservation and corrosion-prevention tank for later use, wherein N is a natural number;
or heating the printing and dyeing water by solar energy, directly blending the heated printing and dyeing water or the heated printing and dyeing water and normal-temperature water into one or more hot water with different temperatures according to a dyeing process, and storing the hot water in a heat-preservation and corrosion-prevention tank for later use;
(2) stacking treatment: placing the grey cloth which is rolled with the pretreatment auxiliary agent in a sealed space at 30-40 ℃ for stacking treatment for at least 20h to ensure that the cold-piled grey cloth has no difference between an upper layer and a lower layer;
(3) pickling at normal temperature: guiding the piled grey cloth into a dyeing device, pickling for 20-30min by using a normal-temperature pickling solution, wherein the acid in the pickling solution is sulfuric acid or glacial acetic acid, the weight of the acid in the pickling solution is 0.5-1% of that of the grey cloth, and draining after pickling at normal temperature;
(4) washing with medium-temperature water: adding the grey cloth which is acid-washed at normal temperature into the hot water with the temperature of 30-60 ℃ blended in the step (1), washing for 10-20min, and then draining;
(5) washing with water at normal temperature: adding normal temperature water into the dyeing device, and washing with water for one or more times until the pH value of the discharged liquid is 6-7;
(6) dyeing preparation: adding hot water at 35-40 ℃ into the washed grey cloth, adding deoxyribonuclease to obtain enzyme removing liquid, and treating in the enzyme removing liquid for 20-30 min;
(7) dyeing treatment: adding the blended hot water of 40 ℃ in the step (1) into a dyeing device, adding salt with the amount required by the dyeing process, adding the blended dye according to the dyeing formula, heating to 60-65 ℃ by using a burner for auxiliary heating, adding alkali after uniform dyeing, keeping the temperature for a set time, and draining after sample checking;
(8) and (3) dyeing post-treatment: and (4) sequentially carrying out water washing and low-temperature soaping on the dyed grey cloth according to set process requirements to finish dyeing of the grey cloth.
2. The energy-saving dyeing method using blended hot water to replace steam in a printing and dyeing mill according to claim 1, characterized in that the waste heat source in the step (1) includes but is not limited to industrial boiler waste steam, waste water or waste heat discharged from a tenter setting machine.
3. The energy-saving dyeing method using blended hot water to replace steam in a printing and dyeing mill according to claim 1, characterized in that in the step (2), a rotary low-temperature pre-treatment machine is adopted for stacking treatment.
4. The energy-saving dyeing method using blended hot water to replace steam in a printing and dyeing mill according to claim 1, characterized in that the temperature of the stacking treatment in the step (2) is 35 ℃ and the stacking time is 20 hours, thereby ensuring that the cold-piled grey cloth has no difference between the upper layer and the lower layer.
5. The energy-saving dyeing method using blended hot water to replace steam in a printing and dyeing mill according to claim 1, characterized in that the temperature of the medium temperature water washing in the step (4) is 60 ℃ and the time of the medium temperature water washing is 10 min.
6. The energy-saving dyeing method using blended hot water instead of steam in a printing and dyeing mill according to claim 1, characterized in that the washing in step (5) is performed twice using normal temperature water.
7. The energy-saving dyeing method using blended hot water to replace steam in a printing and dyeing mill according to claim 1, characterized in that the enzyme-removing liquid in the step (6) is prepared by adding 0.2-0.3% of oxygen-removing enzyme by mass into the hot water at 40 ℃ blended in the step (1).
8. The energy-saving dyeing method using blended hot water to replace steam in a printing and dyeing mill according to claim 1, characterized in that in the step (6), the treatment temperature of the enzyme removing liquid is 40 ℃ and the treatment time is 20 min.
9. The energy-saving dyeing method using blended hot water to replace steam in a printing and dyeing mill according to claim 1, characterized in that in the step (7), the auxiliary heating temperature rise speed of a burner is 1 ℃/min.
10. The energy-saving dyeing method using blended hot water to replace steam in a printing and dyeing mill according to claim 1, characterized in that the alkali is added after the level dyeing and the heat preservation is set for 15-30min at 60-65 ℃, the dyeing substitution alkali is added after the heat preservation for 25-60 min.
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