Waste heat utilization system of printing and dyeing mill

Abstract

The utility model provides a printing and dyeing mill waste heat utilization system which is applied to a printing and dyeing mill workshop and comprises a dye vat, an evaporating tank, a liquefying tank and a heat pump. An inlet of the evaporation tank is communicated with a waste liquid outlet of the dye vat; a first outlet of the evaporating tank is communicated with the liquefying tank to form a steam pipeline; the liquefying tank is communicated with the water replenishing device through a first inlet; an outlet of the liquefying tank is connected with the heat pump; the heat pump is connected with the liquefying tank through the second inlet, air in a printing and dyeing mill workshop enters the heat pump through the third inlet, and the heat pump is connected with the dye vat through the second outlet; wherein the air pressure in the evaporation tank can be adjusted to adjust the boiling point of the dye vat waste liquid. The boiling point of the dye vat waste liquid is reduced through the evaporation tank to vaporize water, and the water is liquefied and mixed with normal-temperature water in the liquefaction tank to recover heat; heat in the air in the printing and dyeing mill workshop is absorbed through the heat pump and transmitted to the liquefying tank, mixed moisture is heated to form hot water, the heat in the dye vat waste liquid and the air in the printing and dyeing mill workshop is recycled, and energy conservation and environmental protection are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial waste heat utilization technical field more particularly, relate to a kind of printing and dyeing factory waste heat utilization system. BACKGROUND

[0002] In printing and dyeing factory workshop, huge printing and dyeing equipment hums, just from printing and dyeing equipment, cloth, still with scalding temperature, hot steam is white smoke, are all releasing a large amount of heat to outside continuously.

[0003] If the heat in printing and dyeing factory workshop air can be recycled and utilized, energy can be saved, green environmental protection.In addition, a large amount of waste heat is also generated in the printing and dyeing process, which needs to be recycled and utilized.For example:1, dyeing process usually needs to heat the dye liquor in dye vat to higher temperature, and the printing and dyeing wastewater discharged generally has a temperature of about 80 DEG C, which still contains a large amount of heat that can be recycled.2, setting machine exhaust waste heat: the gas temperature of setting machine exhaust is generally about 220 DEG C, which also contains considerable heat that can be recycled. SUMMARY

[0004] The utility model provides a kind of printing and dyeing factory waste heat utilization system to solve the technical problem that a large amount of heat in printing and dyeing factory workshop air, a large amount of heat carried in printing and dyeing equipment exhaust water and exhaust gas cannot be recycled and utilized.

[0005] The utility model provides a kind of printing and dyeing factory waste heat utilization system, applied to printing and dyeing factory workshop, including dye vat, evaporating tank, liquefied tank and heat pump;

[0006] The inlet of the evaporating tank is communicated with the waste liquid outlet of the dye vat;The first outlet of the evaporating tank is communicated with the liquefied tank to form a steam pipeline;The liquefied tank is communicated with the water supplementing device through the first inlet, and the outlet of the liquefied tank is connected with the heat pump;

[0007] The heat pump is provided with a second inlet and a third inlet, the second inlet is connected with the liquefied tank, and the air of printing and dyeing factory workshop enters the heat pump through the third inlet, and the heat pump is connected with the dye vat through the second outlet;

[0008] Among them, the gas pressure in the evaporating tank can be adjusted to adjust the boiling point of dye vat waste liquid.

[0009] Further, the evaporating tank is provided with an evaporating device, the evaporating device is composed of a plurality of triangular steps staggered in layers, and the hypotenuse of the triangular step faces upward.

[0010] Further, it further includes a first heat exchanger, and the first heat exchanger is connected with the second outlet of the heat pump.

[0011] Furthermore, it also includes a setting machine, to which the first heat exchanger is connected via a third outlet.

[0012] Furthermore, the air from the dyeing and printing workshop can enter the first heat exchanger through the fourth inlet, and the first heat exchanger is connected to the boiler through the fourth outlet.

[0013] Furthermore, the setting machine is connected to the second heat exchanger through the fifth outlet, and the second heat exchanger is connected to the setting machine through the sixth outlet; the air from the dyeing and printing workshop can enter the second heat exchanger through the fifth inlet.

[0014] Furthermore, the evaporator is equipped with a vacuum pump to regulate the gas pressure, and the evaporator is connected to the vacuum pump via a seventh outlet.

[0015] Furthermore, the evaporator is also equipped with an eighth outlet.

[0016] Furthermore, the heat pump is connected to the air conditioning system via a ninth outlet.

[0017] Furthermore, it also includes a filter, the input end of which is connected to the waste liquid outlet of the dyeing vat, and the output end of which is connected to the heat pump.

[0018] The beneficial effects of this utility model are:

[0019] This utility model discloses a waste heat recovery system for a dyeing and printing plant. It lowers the boiling point of the waste dyeing liquid in an evaporator, vaporizing the water within. The vaporized water is then mixed with room-temperature water in a liquefaction tank to recover heat, effectively recovering heat from the waste dyeing liquid. A heat pump absorbs heat from the air in the dyeing and printing plant workshop and transfers it to the mixed water in the liquefaction tank to heat it into hot water, effectively recovering heat from the air in the workshop, saving energy, and reducing production costs. A first heat exchanger exchanges heat between the air in the workshop and the high-temperature hot water treated by the heat pump, transferring heat from the hot water to the air to create high-temperature air and low-temperature hot water for subsequent processes, effectively recovering heat from the air in the workshop, saving energy, and reducing production costs. A second heat exchanger mixes the air in the workshop with the high-temperature air discharged from the stenter, supplying the stenter with the hot air needed for the stenter, effectively recovering heat from both the workshop air and the air discharged from the stenter.

[0020] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0022] Figure 1 This is a schematic diagram of the structure of the waste heat utilization system for printing and dyeing plants according to an embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram of the evaporation device inside the evaporator in the waste heat utilization system of the dyeing and printing factory according to an embodiment of this utility model;

[0024] Figure 3 This is a schematic diagram of liquefaction inside the liquefaction tank in the waste heat utilization system of the dyeing and printing factory according to an embodiment of this utility model.

[0025] Figure label:

[0026] 1. Dyeing vat; 2. Evaporator; 3. Liquefaction tank; 4. Heat pump; 5. Waste liquid outlet; 6. Steam channel; 7. Water replenishment device; 8. Evaporation device; 9. First heat exchanger; 10. Sterilizer; 11. Boiler; 12. Second heat exchanger; 13. Vacuum pump; 14. Valve; 15. Air conditioning system; 16. Filter; 17. Perforated plate.

[0027] First Exit 101; Second Exit 102; Third Exit 103; Fourth Exit 104; Fifth Exit 105; Sixth Exit 106; Seventh Exit 107; Eighth Exit 108; Ninth Exit 109;

[0028] First entrance 201; Second entrance 202; Third entrance 203; Fourth entrance 204; Fifth entrance 205. Detailed Implementation

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0030] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0031] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0032] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0034] In the specification and claims of this utility model, the terms "first" and "second" may explicitly or implicitly include one or more of those features. In the description of this utility model, unless otherwise stated, "multiple" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and other terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] The waste heat utilization system for printing and dyeing plants according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0038] A waste heat recovery system for a dyeing and printing plant, according to an embodiment of this utility model, is applied in a dyeing and printing plant workshop. It includes a dyeing vat 1, an evaporator 2, a liquefaction tank 3, and a heat pump 4. The air temperature in the dyeing and printing plant workshop is approximately 40°C. Different dyes require different dyeing temperatures; for example, reactive dyes typically require a dyeing temperature between 60°C and 90°C. Therefore, the dye liquor temperature required for dyeing vat 1 is generally 90°C, while the temperature of the waste liquor from the dyeing vat is generally around 80°C.

[0039] Evaporator 2 is used to evaporate the waste liquid from the dyeing vat, thereby vaporizing the water content. The inlet of evaporator 2 is connected to the waste liquid outlet 5 of dyeing vat 1. The first outlet 101 of evaporator 2 is connected to liquefaction tank 3 to form steam pipe 6. The waste liquid from dyeing vat 1 at 80°C first enters evaporator 2 from waste liquid outlet 5. The gas pressure inside evaporator 2 can be adjusted to regulate the boiling point of the waste liquid. Preferably, the gas pressure inside evaporator 2 can be adjusted by vacuum pump 13. Evaporator 2 is connected to vacuum pump 13 through seventh outlet 107. A valve 14 is provided between vacuum pump 13 and evaporator 2, which can control the operation of vacuum pump 13 on evaporator 2. The boiling point of a liquid is related to gas pressure; as the gas pressure decreases, the boiling point of the liquid also decreases. This implementation preferably employs liquid spraying technology for condensation and vaporization. Specifically, the pressure in the evaporator 2, liquefaction tank 3, and steam pipeline 6 is reduced below atmospheric pressure by the suction action of vacuum pump 13, lowering the corresponding water vapor boiling point to 70°C. Then, valve 14 is closed. Part of the 80°C hot water in the dyeing waste liquid flashes into 70°C clean water vapor. The remaining hot water, still containing a large amount of pollutants, is discharged through the eighth outlet 108 on the evaporator 2 and sent to the wastewater treatment center for further processing.

[0040] The liquefaction tank 3 is connected to the water supply device 7 via the first inlet 201. Room temperature water (such as tap water) enters the liquefaction tank 3 through the water supply device 7. 70°C steam delivered from the steam pipe 6 liquefies upon contact with the room temperature water, which then absorbs heat and mixes to form 60°C hot water. Figure 3 As shown, to further facilitate the mixing of 70°C steam and room temperature water, a perforated plate 17 is provided inside the liquefaction tank 3. The perforated plate 17 has multiple water outlets, preferably with a diameter of 8mm to 20mm and a spacing of 30mm to 40mm. After entering the liquefaction tank 3, the room temperature water flows through the perforated plate 17, where it is dispersed and sprayed down through the multiple water outlets. This increases the contact area between the 70°C steam and the room temperature water, enabling faster liquefaction of the 70°C steam. Simultaneously, the room temperature water flowing out of the perforated plate 17 directly cools the 70°C steam, causing it to condense rapidly and create a vacuum environment. This ensures that the vacuum level inside the evaporator 2 and the liquefaction tank 3 is not disrupted, guaranteeing condensation efficiency.

[0041] The outlet of the liquefied tank 3 is connected to the heat pump 4. The heat pump 4 is provided with a second inlet 202 and a third inlet 203. The second inlet 202 is connected to the liquefied tank 3. 60°C hot water flows from the liquefied tank 3 into the heat pump 4 through the second inlet 202. The 40°C air in the dyeing and printing workshop enters the heat pump 4 through the third inlet 203. The heat pump 4 is connected to the dyeing vat 1 through the second outlet 102. The heat pump 4 is preferably an air source heat pump. The heat pump 4 can extract heat from a low-temperature heat source and convert it into high-temperature heat energy. Specifically, the heat pump 4 absorbs heat from the 40°C air in the dyeing and printing workshop and raises the 60°C hot water to 90°C. The 90°C hot water is exactly the temperature required for the operation of the dyeing vat 1. The heat pump 5 supplies the 90°C hot water to the dyeing vat 1 through the second outlet 102 for water replenishment.

[0042] This utility model discloses a waste heat recovery system for a dyeing and printing plant. It uses an evaporator 2 to lower the boiling point of water, vaporizing the water in the waste liquid discharged from the dyeing vat 1. This vaporized water is then liquefied and mixed with room-temperature water in a liquefaction tank 3 to generate 60°C hot water. Liquid spraying technology is used to condense the steam and create a vacuum, effectively recovering heat from the waste liquid and achieving high energy efficiency. Low-temperature flash evaporation technology further recovers and utilizes the heat from the waste liquid discharged from the dyeing vat 1, solving the problem of pipe blockage caused by direct discharge of pollutants from the waste liquid and improving the overall energy efficiency of the system. High-temperature heat pump technology is used, where a heat pump 4 absorbs heat from the 40°C air in the dyeing and printing workshop and transfers it to the 60°C hot water mixed in the liquefaction tank 3, raising the temperature to 90°C. This effectively recovers heat from the 40°C air in the dyeing and printing workshop and replenishes the dyeing vat 1 with water at the required temperature, saving energy, reducing production costs, and improving the workshop working environment.

[0043] like Figure 2 As shown, to accelerate water evaporation, an evaporation device 8 is installed inside the evaporator tank 2. The evaporation device consists of multiple staggered triangular steps, with the hypotenuses of the triangular steps facing upwards. The preferred side length of the hypotenuses of the triangular steps is 15mm to 30mm. The evaporation device 8 can be directly welded to the inner wall of the evaporator tank 2, or it can be detachably fixed to the inner wall of the evaporator tank 2. A water spray pipe with small holes is installed at the top of the evaporator tank 2. The small holes are located at the top of the triangular steps. After the wastewater from the dye vat 1 flows into the evaporator tank 2, it is transformed into a fine water column and drips down through the small holes on the water spray pipe. The water droplets are blocked by the hypotenuses of the staggered triangular steps, which prolongs the residence time of the water droplets in the air, making them easier to evaporate and thus improving the evaporation efficiency.

[0044] This utility model discloses a waste heat utilization system for a dyeing and printing plant, which includes a first heat exchanger 9, a stenter 10, and a boiler 11. The first heat exchanger 9 is connected to the second outlet 102 of the heat pump 4, and to the stenter 10 via a third outlet 103. Air from the dyeing and printing plant workshop enters the first heat exchanger 9 through a fourth inlet 204, and the first heat exchanger 9 is connected to the boiler 11 via the fourth outlet 104. Part of the 90°C hot water generated by the heat pump 4 is supplied to the dyeing vat 1 for makeup water, and the other part enters the first heat exchanger 9 through the second outlet 102. The first heat exchanger 9 absorbs 40°C air from the dyeing and printing plant workshop and exchanges heat with the 90°C hot water through the fourth inlet 204, cooling the 90°C hot water to 60°C and supplying it to the boiler 11 for makeup water. Simultaneously, it heats the 40°C air to 80°C and supplies it to the stenter 10 for makeup air. By employing heat exchange technology, the system reuses the air from the dyeing and printing plant workshop, using its heat for hot water heating, fully recovering the system's waste heat, and achieving energy conservation and emission reduction.

[0045] This utility model discloses a waste heat recovery system for a dyeing and printing plant, which also includes a second heat exchanger 12. The second heat exchanger 12 is located at the outlet end of the stenter 10 to recover and utilize the hot air discharged from the stenter 10, which has a temperature as high as 220°C. The stenter 10 is connected to the second heat exchanger 12 through the fifth outlet 105, and the second heat exchanger 12 is connected to the stenter 10 through the sixth outlet 106. The 40°C air from the dyeing and printing plant workshop can enter the second heat exchanger 12 through the fifth inlet 205. The 220°C hot air discharged from the stenter 10 enters the second heat exchanger 12, and the second heat exchanger 12 draws in the 40°C air from the dyeing and printing plant workshop through the fifth inlet 205. The 220°C hot air and the 40°C air are exchanged to generate 120°C hot air and 80°C hot air. The 80°C hot air enters the stenter 10 through the sixth outlet 106 to serve as makeup air for the stenter 10, while the 120°C hot air is discharged as waste gas. Through heat exchange technology, the 220°C hot air discharged from the stenter 10 is cooled to 120°C before being discharged, while the 40°C hot air is heated to 80°C and supplied to the stenter 10 as make-up air, further saving energy and reducing emissions.

[0046] This utility model's waste heat utilization system for a printing and dyeing factory also includes an air conditioning system 15, with a heat pump 4 connected to the air conditioning system 15 via a ninth outlet 109. The heat pump 4 absorbs heat from the 40°C air in the printing and dyeing factory workshop, raises the temperature of the 60°C hot water to 90°C, and discharges it through the second outlet 102. Simultaneously, it lowers the air temperature from 40°C to approximately 24°C, introducing the generated 24°C cool air into the air conditioning system 15 through the ninth outlet 109. This provides cool air to the office area, further saving energy and reducing emissions.

[0047] This utility model's waste heat utilization system for a dyeing and printing plant also includes a filter 16. The input end of the filter 16 is connected to the waste liquid outlet 5 of the dyeing vat 1, and the output end of the filter 16 is connected to a heat pump 4. That is, the waste liquid from the dyeing vat 1 can be filtered through the filter 16 and directly introduced into the heat pump 4. After the filtered 80°C hot water enters the heat pump 4, the heat pump 4 absorbs the 40°C air from the dyeing and printing plant workshop and converts the heat with the 80°C hot water, raising the 80°C hot water to 90°C. This hot water is then supplied to the dyeing vat 1 through the second outlet 102 for makeup water, or it can enter the first heat exchanger 9 for the next stage of heat exchange, reducing the 40°C air absorbed from the dyeing and printing plant workshop to 24°C cold air before being introduced into the air conditioning system 15. By filtering the waste liquid from the dyeing vat and directly introducing it into the heat pump 4, the waste heat of the dyeing vat waste liquid is fully utilized, further saving energy and reducing emissions.

[0048] Of course, for those skilled in the art, other structures and working principles of the waste heat utilization system in printing and dyeing plants are understandable and achievable, and will not be described in detail in this utility model.

[0049] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A printing and dyeing plant waste heat utilization system applied to a printing and dyeing plant workshop, characterized in that, The dyeing vat (1), the evaporation tank (2), the liquefaction tank (3) and the heat pump (4) are included. The inlet of the evaporation tank (2) is communicated with the waste liquid outlet (5) of the dyeing vat (1); the first outlet (101) of the evaporation tank (2) is communicated with the liquefaction tank (3) to form a steam pipeline (6); the liquefaction tank (3) is communicated with the water supplement device (7) through the first inlet (201), and the outlet of the liquefaction tank (3) is connected with the heat pump (4). The heat pump (4) is provided with the second inlet (202) and the third inlet (203); the second inlet (202) is connected with the liquefaction tank (3), and the air in the workshop of the printing and dyeing plant enters the heat pump (4) through the third inlet (203); the heat pump (4) is connected with the dyeing vat (1) through the second outlet (102). The air pressure in the evaporation tank (2) can be adjusted to adjust the boiling point of the waste liquid in the dyeing vat.

2. A system for utilizing waste heat in a textile printing and dyeing plant according to claim 1, characterized in that, The evaporation device (8) is arranged in the evaporation tank (2), and the evaporation device (8) is composed of multiple triangular steps staggered in layers, and the hypotenuse of the triangular step faces upward.

3. The system for utilizing waste heat of a printing and dyeing factory according to claim 1, characterized in that, The first heat exchanger (9) is connected with the second outlet (102) of the heat pump (4).

4. The system for utilizing waste heat of a textile printing and dyeing mill according to claim 3, characterized in that, The first heat exchanger (9) is connected with the setting machine (10) through the third outlet (103).

5. A system for utilizing waste heat in a textile printing and dyeing plant according to claim 4, characterized in that, The air in the workshop of the printing and dyeing plant can enter the first heat exchanger (9) through the fourth inlet (204), and the first heat exchanger (9) is connected with the boiler (11) through the fourth outlet (104).

6. A system for utilizing waste heat in a textile printing and dyeing plant according to claim 4, characterized in that, The setting machine (10) is connected with the second heat exchanger (12) through the fifth outlet (105), the second heat exchanger (12) is connected with the setting machine (10) through the sixth outlet (106), and the air in the workshop of the printing and dyeing plant can enter the second heat exchanger (12) through the fifth inlet (205).

7. The system for utilizing waste heat of a textile printing and dyeing factory according to claim 1, characterized in that, The air pressure of the evaporation tank (2) is adjusted by the vacuum pump (13), and the evaporation tank (2) is connected with the vacuum pump (13) through the seventh outlet (107).

8. The system for utilizing waste heat of a textile printing and dyeing factory according to claim 1, characterized in that, The eighth outlet (108) is further arranged on the evaporation tank (2).

9. The system for utilizing waste heat of a textile printing and dyeing factory according to claim 1, characterized in that, The heat pump (4) is connected with the air conditioning system (15) through the ninth outlet (109).

10. The system for utilizing waste heat of a textile printing and dyeing factory according to claim 1, characterized in that, The filter (16) is further included, the input end of the filter (16) is connected with the waste liquid outlet (5) of the dyeing vat (1), and the output end of the filter (16) is connected with the heat pump (4).

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