Knitted fabric dyeing wastewater waste heat recovery device

Abstract

The utility model relates to a waste heat recovery technical field, specifically disclose a kind of knitted fabric dyeing wastewater waste heat recovery device, including the wastewater collection tank for collecting dyeing wastewater, with the heat exchanger of wastewater channel and cold water channel, preheating water tank, steam generator and control system;The wastewater collection tank is connected with the wastewater inlet of heat exchanger by pipeline, and the wastewater outlet of heat exchanger is connected to sewage treatment system;The cold water inlet of heat exchanger is connected with external water source, and the hot water outlet of heat exchanger is connected with preheating water tank by pipeline;The preheating water tank is connected with steam generator by pipeline;The device ensures water quality by double-layer filtration and self-cleaning system of wastewater collection tank, spiral plate heat exchanger efficiently recovers waste heat, the linkage control of preheating water tank and steam generation equipment, realizes the cascade utilization of knitted fabric dyeing wastewater waste heat, significantly reduces energy consumption and improves system stability.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, and specifically discloses a waste heat recovery device for the dyeing wastewater of knitted fabric. Background Art

[0002] In the knitted fabric printing and dyeing industry, the dyeing process is a key link in energy consumption. During the dyeing process, to meet the process requirements, a large amount of water needs to be heated to a high temperature state, and the temperature of the wastewater discharged after dyeing is usually still as high as 60 - 90°C. It is statistically shown that the wastewater discharge in the printing and dyeing industry is huge. If these high-temperature dyeing wastewater is directly discharged, it will not only cause a large amount of heat energy waste, but also bring great pressure to the subsequent sewage treatment. On the one hand, after the high-temperature wastewater enters the sewage treatment system, it will affect the microbial activity, reduce the biochemical treatment efficiency, and increase the sewage treatment cost; on the other hand, to maintain the temperature requirements of the dyeing process, enterprises need to consume a large amount of energy such as coal and natural gas to produce steam, resulting in an increase in production costs. There are various problems with the waste heat recovery devices for dyeing wastewater on the current market. Some devices have complex structures and low heat exchange efficiency, and cannot fully recover the heat in the wastewater; some devices lack effective filtering and impurity treatment measures, which easily lead to blockage of the heat exchanger, affecting the normal operation and service life of the equipment; and some devices have low automation levels and are difficult to accurately control according to the actual working conditions, resulting in unstable waste heat recovery effects. Therefore, there is an urgent need to develop a waste heat recovery device for the dyeing wastewater of knitted fabric with high efficiency, stability, and high automation level to achieve the goals of energy conservation, emission reduction, and reduction of production costs. Content of the Utility Model

[0003] The utility model proposes a waste heat recovery device for the dyeing wastewater of knitted fabric, which realizes the efficient recovery of the waste heat of the dyeing wastewater and converts it into steam through the coordinated action of each component, so as to reduce energy consumption and production costs, reduce pollutant emissions, improve the sewage treatment efficiency, ensure stable production, and facilitate maintenance.

[0004] The utility model is realized as follows. A waste heat recovery device for the dyeing wastewater of knitted fabric includes a wastewater collection tank for collecting dyeing wastewater, a heat exchanger with a wastewater channel and a cold water channel, a preheating water tank, a steam generator, and a control system; the wastewater collection tank is connected to the wastewater inlet of the heat exchanger through a pipeline, and the wastewater outlet of the heat exchanger is connected to the sewage treatment system; the cold water inlet of the heat exchanger is connected to an external water source, and the hot water outlet of the heat exchanger is connected to the preheating water tank through a pipeline; the preheating water tank is connected to the steam generator through a pipeline, and the steam generated by the steam generator is used for the knitted fabric dyeing process; the control system is electrically connected to the heat exchanger, the preheating water tank, and the steam generator respectively to control the operation of the heat exchanger, the preheating water tank, and the steam generator; The wastewater collection tank is equipped with parallel double-layer filter plates. The double-layer filter plates include a fixed frame and a fine filter screen and a coarse filter screen installed therein. The coarse filter screen is located below the fine filter screen and its pore size is larger than that of the fine filter screen. The inlet of the pipe connecting the wastewater collection tank to the wastewater channel inlet of the heat exchanger is located above the fine filter screen. The bottom of the wastewater collection tank has a 60° conical structure and is equipped with a drain outlet with a pneumatic butterfly valve.

[0005] As a preferred embodiment of the waste heat recovery device for dyeing knitted fabrics according to this utility model, the outer wall of the wastewater collection tank is provided with a heat insulation layer.

[0006] As a preferred embodiment of the waste heat recovery device for dyeing knitted fabrics according to this utility model, a high-pressure flushing pipe is provided at the top of the wastewater collection tank; a flushing pump is provided on the wastewater collection tank, the inlet of the flushing pump is connected to the clear water area above the fine filter screen through a pipe, and the outlet of the flushing pump is connected to the high-pressure flushing pipe through a pipe.

[0007] As a preferred embodiment of the waste heat recovery device for dyeing knitted fabrics according to this utility model, the heat exchanger is a spiral plate heat exchanger, and the wastewater channel plates and cold water channel plates are arranged in an alternating spiral structure; a flow regulating valve is installed at the inlet of the cold water channel of the heat exchanger, and the flow regulating valve is electrically connected to the control system.

[0008] As a preferred embodiment of the waste heat recovery device for dyeing wastewater of knitted fabrics according to this utility model, a temperature sensor is installed in the preheating water tank, and the temperature sensor is electrically connected to the control system.

[0009] As a preferred embodiment of the waste heat recovery device for dyeing wastewater of knitted fabrics according to this utility model, the control system adjusts the opening of the flow regulating valve according to the temperature signal in the preheating water tank in order to maintain a constant water temperature in the preheating water tank.

[0010] The beneficial effects of this utility model are: 1. By recovering the waste heat from dyeing wastewater and converting it into steam that can be used in the dyeing process, the consumption of fresh steam is significantly reduced, energy costs are lowered, and energy efficiency is improved. Taking a printing and dyeing factory as an example, after using this device, the annual steam consumption can be reduced by thousands of tons, saving a lot of energy costs. Moreover, it has good environmental benefits. On the one hand, it reduces the emission of pollutants generated from the production of fresh steam, thus reducing environmental pollution. On the other hand, it lowers the temperature of wastewater entering the sewage treatment system, which is beneficial to subsequent sewage treatment, improves the sewage treatment effect, and reduces the harm of wastewater to the environment.

[0011] 2. The automated control function of this device makes the waste heat recovery process more stable and reliable, and can continuously provide a stable steam supply for the dyeing process, ensuring the continuity of the production process, improving production efficiency, and reducing production interruptions caused by unstable energy supply. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the wastewater collection tank and insulation layer of this utility model.

[0015] Figure 3 This is a cross-sectional view of the double-layer filter plate of this utility model.

[0016] The markings in the diagram are: 1. Wastewater collection tank; 2. Heat exchanger; 3. Preheating water tank; 4. Steam generator; 5. Control system; 6. Insulation layer; 7. Double-layer filter plate; 8. Fixing frame; 9. Fine filter screen; 10. Coarse filter screen; 11. Pneumatic butterfly valve; 12. Sewage outlet; 13. High-pressure flushing pipe; 14. Flushing pump; 15. Flow regulating valve; 16. Temperature sensor. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0018] Please see Figure 1-3 A waste heat recovery device for knitted fabric dyeing wastewater includes a wastewater collection tank 1 for collecting dyeing wastewater, a heat exchanger 2 with wastewater channels and cold water channels, a preheating water tank 3, a steam generator 4, and a control system 5. The wastewater collection tank 1 is connected to the wastewater inlet of the heat exchanger 2 via a pipe, and the wastewater outlet of the heat exchanger 2 is connected to a sewage treatment system. The cold water inlet of the heat exchanger 2 is connected to an external water source, and the hot water outlet of the heat exchanger 2 is connected to the preheating water tank 3 via a pipe. The preheating water tank 3 is connected to the steam generator 4 via a pipe, and the steam generated by the steam generator 4 is used for the knitted fabric dyeing process. The control system 5 is electrically connected to the heat exchanger 2, the preheating water tank 3, and the steam generator 4 respectively, and controls the operation of the heat exchanger 2, the preheating water tank 3, and the steam generator 4. The wastewater collection tank 1 is equipped with parallel double-layer filter plates 7. The double-layer filter plates 7 include a fixed frame 8 and a fine filter screen 9 and a coarse filter screen 10 installed therein. The coarse filter screen 10 is located below the fine filter screen 9 and its pore size is larger than that of the fine filter screen 9. The inlet of the pipe connecting the wastewater collection tank 1 to the wastewater channel inlet of the heat exchanger 2 is located above the fine filter screen 9. The bottom of the wastewater collection tank 1 has a 60° conical structure and is equipped with a drain outlet 12 with a pneumatic butterfly valve 11.

[0019] In this embodiment: During operation, the wastewater from knitted fabric dyeing first flows into the wastewater collection tank 1, which temporarily stores the wastewater. Then, the wastewater enters the wastewater channel of the heat exchanger 2 through a pipe. Simultaneously, an external water source is connected to the cold water channel of the heat exchanger 2. Inside the heat exchanger 2, the fluids in the wastewater and cold water channels exchange heat through plates, transferring heat from the wastewater to the cold water, thus raising its temperature. The heated water then flows through a pipe into the preheating water tank 3 for temporary storage. The water in the preheating water tank 3 then enters the steam generator 4, which heats the water to generate steam. This steam can be reused in the knitted fabric dyeing process, achieving waste heat recovery. The control system 5 is responsible for intelligent control of the heat exchanger 2, the preheating water tank 3, and the steam generator 4, coordinating the orderly operation of each component to ensure the entire waste heat recovery process is efficient and stable. The double-layer filter plate 7 enables graded filtration of wastewater, effectively intercepting impurities and preventing the heat exchanger 2 from clogging; the conical bottom and drain outlet 12 facilitate the discharge of impurities, maintain the cleanliness of the collection tank, ensure the cleanliness of wastewater entering the heat exchanger 2, extend the service life of the heat exchanger 2, and improve the stability and reliability of the device operation.

[0020] As a technical optimization of this utility model, the outer wall of the wastewater collection tank 1 is provided with a heat insulation layer 6.

[0021] In this embodiment, the heat loss of wastewater is reduced by the insulation layer 6, the temperature of wastewater entering the heat exchanger 2 is increased, thereby improving the heat exchange efficiency and waste heat recovery effect, optimizing the device performance in detail and reducing heat loss.

[0022] As a technical optimization of this utility model, a high-pressure flushing pipe 13 is provided on the top of the wastewater collection tank 1; a flushing pump 14 is provided on the wastewater collection tank 1, the inlet of the flushing pump 14 is connected to the clear water area above the fine filter screen 9 through a pipe, and the outlet of the flushing pump 14 is connected to the high-pressure flushing pipe 13 through a pipe.

[0023] In this embodiment: The wastewater collection tank 1 is equipped with a high-pressure flushing pipe 13 and a flushing pump 14 at the top, forming an automatic cleaning system. The filter plates are flushed regularly to prevent impurities from accumulating on the filter plates, ensuring that the filter plates continue to work effectively, guaranteeing the long-term stable operation of the entire filtration process, and reducing the cost and frequency of manual maintenance. The control system 5 executes a backwashing procedure: every 8 hours of operation, the wastewater inlet pipe is closed, the flushing pump 14 is started to flush the filter screen for 60 seconds, and at the same time, the pneumatic butterfly valve 11 is opened to discharge sewage for 10 seconds.

[0024] As a technical optimization of this utility model, the heat exchanger 2 is a spiral plate heat exchanger, and the wastewater channel plate and the cold water channel plate are arranged in an alternating spiral structure; a flow regulating valve 15 is installed at the inlet of the cold water channel of the heat exchanger 2, and the flow regulating valve 15 is electrically connected to the control system 5.

[0025] In this embodiment: the spiral plate structure improves heat exchange efficiency, and the flow regulating valve 15 enables precise control of the heat exchange process. The combination of the two improves the efficiency and stability of heat exchange, enabling the device to recover heat from wastewater more efficiently and flexibly adjust the hot water output temperature according to actual needs.

[0026] As a technical optimization of this utility model, a temperature sensor 16 is installed in the preheating water tank 3, and the temperature sensor 16 is electrically connected to the control system 5.

[0027] In this embodiment, the temperature sensor 16 provides real-time water temperature data to the control system 5, enabling the control system 5 to adjust the device according to the water temperature. This is an important foundation for realizing the automated and intelligent operation of the device, ensuring that the device can make reasonable responses according to the actual working conditions and maintain the stable operation of the system.

[0028] As a technical optimization of this utility model, the control system 5 adjusts the opening of the flow regulating valve 15 according to the temperature signal in the preheating water tank 3 in order to maintain a constant water temperature in the preheating water tank 3.

[0029] In this embodiment, closed-loop control enables precise regulation of the heat exchange process, ensuring that the water temperature in the preheating tank 3 remains stable within a suitable range, and guaranteeing that the steam generator 4 can stably generate steam that meets the process requirements, thereby improving the overall stability and reliability of the device.

[0030] Working principle and usage process of this utility model: After being discharged from the production equipment, the dyeing wastewater flows into the wastewater collection tank 1. It passes through the insulation layer 6 to reduce heat loss, and is filtered by a double-layer filter plate 7. Impurities at the bottom of the tank are periodically discharged through a conical structure and the drain outlet 12. Next, the wastewater flows from the collection tank through a pipe into the wastewater channel of the heat exchanger 2, while external cold water enters the cold water channel of the heat exchanger 2. Heat exchange occurs between the two within the heat exchanger 2. The wastewater after heat exchange flows out from the wastewater outlet of the heat exchanger 2 and is sent to the sewage treatment system. The heated cold water flows out from the hot water outlet of the heat exchanger 2 and enters the preheating water tank 3 for storage. When the water temperature in the preheating water tank 3 reaches a certain level, the water flows into the steam generator 4, which heats the water to generate steam for use in the knitted fabric dyeing process. Throughout the process, the control system 5 adjusts the opening of the flow regulating valve 15 at the inlet of the cold water channel of the heat exchanger 2 based on the signal from the temperature sensor 16 inside the preheating water tank 3 to maintain a constant water temperature in the preheating water tank and ensure stable operation of the device.

[0031] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", 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 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. Therefore, they should not be construed as limitations on this utility model.

[0032] However, the above are merely specific embodiments of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A waste heat recovery device for dyeing wastewater from knitted fabrics, characterized in that: The system includes a wastewater collection tank (1) for collecting dyeing wastewater, a heat exchanger (2) with wastewater and cold water channels, a preheating water tank (3), a steam generator (4), and a control system (5). The wastewater collection tank (1) is connected to the wastewater inlet of the heat exchanger (2) via a pipe, and the wastewater outlet of the heat exchanger (2) is connected to a sewage treatment system. The cold water inlet of the heat exchanger (2) is connected to an external water source, and the hot water outlet of the heat exchanger (2) is connected to the preheating water tank (3) via a pipe. The preheating water tank (3) is connected to the steam generator (4) via a pipe, and the steam generated by the steam generator (4) is used for the dyeing process of knitted fabrics. The control system (5) is electrically connected to the heat exchanger (2), the preheating water tank (3), and the steam generator (4) respectively, and controls the operation of the heat exchanger (2), the preheating water tank (3), and the steam generator (4). The wastewater collection tank (1) is equipped with parallel double-layer filter plates (7). The double-layer filter plates (7) include a fixed frame (8) and a fine filter screen (9) and a coarse filter screen (10) installed therein. The coarse filter screen (10) is located below the fine filter screen (9) and its pore size is larger than that of the fine filter screen (9). The inlet of the pipe connecting the wastewater collection tank (1) to the wastewater channel inlet of the heat exchanger (2) is located above the fine filter screen (9). The bottom of the wastewater collection tank (1) has a 60° conical structure and is equipped with a drain outlet (12) with a pneumatic butterfly valve (11).

2. The waste heat recovery device for knitted fabric dyeing wastewater according to claim 1, characterized in that: The outer wall of the wastewater collection tank (1) is provided with a heat insulation layer (6).

3. The waste heat recovery device for knitted fabric dyeing wastewater according to claim 1, characterized in that: The top of the wastewater collection tank (1) is provided with a high-pressure flushing pipe (13); the wastewater collection tank (1) is provided with a flushing pump (14), the inlet of the flushing pump (14) is connected to the clear water area above the fine filter screen (9) through a pipe, and the outlet of the flushing pump (14) is connected to the high-pressure flushing pipe (13) through a pipe.

4. The waste heat recovery device for knitted fabric dyeing wastewater according to claim 1, characterized in that: The heat exchanger (2) is a spiral plate heat exchanger, and the wastewater channel plates and cold water channel plates are arranged in an alternating spiral structure; a flow regulating valve (15) is installed at the inlet of the cold water channel of the heat exchanger (2), and the flow regulating valve (15) is electrically connected to the control system (5).

5. The waste heat recovery device for knitted fabric dyeing wastewater according to claim 1, characterized in that: The preheating water tank (3) is equipped with a temperature sensor (16), which is electrically connected to the control system (5).

6. The waste heat recovery device for knitted fabric dyeing wastewater according to claim 1, characterized in that: The control system (5) adjusts the opening of the flow regulating valve (15) according to the temperature signal in the preheating water tank (3) to maintain a constant water temperature in the preheating water tank (3).

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