Dyeing machine heat management and recovery system

Abstract

A water inlet is additionally arranged at a heating and cooling inlet of a No.15 heat exchanger of a No.16 dyeing machine, a No.3 valve is installed, the valve is connected to a No.11 efficient water return pipe, the No.11 efficient water return pipe is respectively connected with a No.8 valve, a No.9 valve and No.3 valves of other dyeing machines, a pipeline is additionally arranged at a heating and cooling drainage pipe of the No.15 heat exchanger, and the pipeline is connected with a No.4 valve and a No.5 valve through a tee joint. The valves are respectively connected to a No.12 hot water pipe and a No.13 water return pipe, so that cooling water of a No.16 dyeing machine needing to be cooled enters the heat exchanger through a No.4 valve and flows into a No.11 high-efficiency water return pipe through a No.3 valve after absorbing heat, and another dyeing machine needing to be heated flows into a No.11 high-efficiency water return pipe through a No.3 valve of the No.11 high-efficiency water return pipe; the method comprises the following steps: introducing heated cooling water into a No.15 heat exchanger, after heat exchange and temperature detection, discharging relatively cold water into a No.14 original cooling drainage pipe through an original No.6 valve, and when the water temperature (a No.23 temperature probe) reaches a set value, closing the No.6 valve, switching to a No.5 valve, introducing hot water into a No.13 water return pipe and returning to a No.18 hot water tank. Condensate water of a seventh valve is connected into a thirteenth water return pipe and is introduced into an eighteenth hot water tank to serve as recycled exchange water. And the common part of the recovery device is arranged in the dotted line frame.

Description

Technical Field

[0001] The invention relates to a heat management recovery system for a dyeing machine. Background Art

[0002] With the development of science and technology, the country has also introduced corresponding policies for energy conservation and emission reduction, from eliminating high-energy-consuming transformers and motors to eliminating dyeing machines and washing machines with high bath ratios. At present, the energy consumption of the printing and dyeing industry can be divided into three parts: dyeing steam consumption, shaping natural gas consumption and electric energy consumption. The energy consumption ratio of the three parts is about 50%-55% for dyeing, about 30%-35% for shaping, and about 15%-20% for electric energy consumption. From the above, it can be seen that dyeing consumes the most energy. Therefore, reducing energy consumption in dyeing is the most obvious for energy conservation and emission reduction in the entire printing and dyeing industry. The conventional dyeing process is to heat the dyeing water in the dyeing machine to 130 degrees according to the process requirements at the temperature rise rate set by the computer. The color absorption process has ended. After a period of heat preservation and color fixation, the temperature begins to drop. At this time, in addition to the heat preservation loss, most of the energy of the steam is converted into water. At present, the dyeing factory uses the heat exchanger to cool the cooling water, and the cooling water flows into the cooling pool. The normal pool temperature is between 50 and 70 degrees. The utilization rate is very low. Most dyeing factories can only use it for post-processing or washing. The unused hot water must be cooled by the cooling tower and then flow into the cold water pool. The cooling tower not only wastes electricity, but also evaporates 2%-3% of the water. According to a 150-ton cooling tower, the water evaporated every day is about 80 tons. Summary of the invention

[0003] The present invention is a set of heat management recovery system designed to address the deficiencies of the prior art. A water inlet is added at the inlet of the heating and cooling inlet of the heat exchanger No. 15 of the dyeing machine No. 16, and a valve No. 3 is installed. The valve is connected to the high-efficiency return pipe No. 11, and the high-efficiency return pipe No. 11 is respectively connected to the valve No. 8 and the valve No. 9 and the valve No. 3 of other dyeing machines. A pipeline is added to the heating and cooling drainage pipe of the heat exchanger No. 15, and the valve No. 4 and the valve No. 5 are connected through a tee. The valves are respectively connected to the hot water pipe No. 12 and the return pipe No. 13, so that the cooling water of the dyeing machine No. 16 that needs to be cooled passes through the 4 valves. The water enters the heat exchanger through the No. 3 valve and flows into the No. 11 high-efficiency return pipe through the No. 3 valve after absorbing heat. Another dyeing machine that needs to be heated introduces the heated cooling water into the No. 15 heat exchanger through the No. 3 valve of the No. 11 high-efficiency return pipe. After heat exchange, after temperature detection, the colder water is discharged into the No. 14 original cooling drainage pipe through the original No. 6 valve. When the water temperature (No. 23 temperature probe) reaches the set value, the No. 6 valve is closed and switched to the No. 5 valve to introduce the hot water into the No. 13 return pipe and return it to the hot water tank. The condensed water from the No. 7 valve is connected to the No. 13 return pipe and introduced into the No. 18 hot water tank as recycled exchange water. Compared with the prior art, the present invention has a reasonable design. The waste heat generated by cooling the dyeing machine to 130 degrees is used to directly introduce the heat into the dyeing machine that needs to be heated up through valves and pipes. Through PLC software, many dyeing machines can be connected in series for centralized control, and the heat that originally needs to be cooled and released is directly transmitted to the dyeing machine that needs to be heated up. In this way, multiple utilization of thermal energy is achieved, and the use of cooling water and cooling towers is reduced, thereby reducing energy consumption and achieving the purpose of energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0004] Figure 1 It is a schematic diagram of the structure of the present invention.

[0005] 1. Original heating valve, 2. Original cooling valve, 3. No. 3 valve, 4. No. 4 valve, 5. No. 5 valve, 6. No. 6 valve, 7. No. 7 valve, 8. No. 8 valve, 9. No. 9 valve, 10. Hot water pump, 11. High-efficiency return pipe, 12. Hot water pipe, 13. Return pipe, 14. Original cooling drainage pipe, 15. Exchanger, 16. Dyeing machine, 18. Hot water tank, 19. Dyeing machine main pump, 20. Original steam pipe, 21. Original cooling water pipe, 22. Water tank temperature probe, 23. Temperature probe, 24. Dyeing machine temperature probe, 25. Return pipe temperature probe, 26. Water tank level probe Implementation

[0006] . Figure 1When the temperature of the dyeing machine in the workshop is increased or decreased, the temperature of the No. 18 hot water tank (No. 22 temperature probe) and the dyeing machine (No. 24 temperature probe) is compared to meet the heat recovery requirements, and the No. 10 hot water pump is started (in order to distinguish multiple No. 16 dyeing machines, their numbers are replaced by English letters). The A dyeing machine starts to cool down from 130 degrees. First, close the No. 2 original cooling valve and the No. 7 original cooling drain valve, open the No. 3 valve and the No. 4 valve, and the hot water will flow into the A dyeing machine heat exchanger through the No. 4 valve and flow back to the No. 11 return pipe through the No. 3 valve, and flow into the No. 18 hot water tank through the No. 9 valve. When the B dyeing machine starts to heat up, close the No. 9 valve. Dyeing machine B closes the original steam valve No. 1 and condensate drain valve No. 7, opens valves No. 3 and No. 6, and hot water will flow out from the heat exchanger of dyeing machine A through valve No. 3 to return pipe No. 11, and then flow into valve No. 3 of the exchanger of dyeing machine B. That is to say, the hot water of valve No. 4 of dyeing machine A flows out through valve No. 3 after heat exchange in the heat exchanger, and is delivered to dyeing machine B through pipeline No. 11. It flows into the heat exchanger from valve No. 3 of dyeing machine B and then flows out from valve No. 6, and the heat energy is exchanged to dyeing machine B. When the return water temperature of dyeing machine B (temperature probe 23) exceeds the set temperature, valve No. 6 is closed, valve No. 5 is opened, and hot water returns to return pipe No. 13 and flows into the hot water tank. When the temperature of dyeing machine B cannot keep up with the rate, it switches to the original heating system. When the dyeing machine is heated by heat transfer oil or natural gas, heat recovery continues to run until the temperature of the cooling dyeing machine is close to that of the heating dyeing machine (with temperature difference setting), and the recovery is terminated. The advantage of this system is that it can use a PLC system to collect and analyze the temperature and heating and cooling signals of all dyeing machines, reasonably distribute and control thermal energy, and directly introduce the temperature of the cooling dyeing machine starting from 130 degrees into the dyeing machine that needs to be heated up. Multiple machines can perform heat exchange, and the recovery efficiency can reach 30%.

Claims

1. A thermal management recovery system for a dyeing machine, the common parts of which include the installation of a high-efficiency return pipe No. 11, a hot water pipe No. 12, a return pipe No. 13, a hot water pump No. 10 and a hot water tank No. 18; wherein two valves No. 8 and No. 9 are added to the high-efficiency return pipe No. 11, which are connected to the original cooling return pipe No. 14 and the hot water tank No. 18 respectively.

2. The thermal management recovery system is to add a No. 3 valve next to the original dyeing machine temperature control valve, and the valve is connected to the No. 11 high-efficiency return pipe; add a water pipe to the original dyeing machine temperature control drain pipe, connect valve No. 4 and valve No. 5 through a tee, valve No. 4 and valve No. 5 are respectively connected to hot water pipe No. 12 and return pipe No. 13, return pipe No. 13 is connected to hot water tank No. 18, hot water pipe No. 12 is connected to the outlet of hot water pump No. 10; the original No. 7 condensation drain pipe is connected to the No. 13 return pipe.

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