CN112379703B - Printing and dyeing wastewater waste heat recycling system based on differential temperature regulation - Google Patents
Printing and dyeing wastewater waste heat recycling system based on differential temperature regulation Download PDFInfo
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- CN112379703B CN112379703B CN202011115109.1A CN202011115109A CN112379703B CN 112379703 B CN112379703 B CN 112379703B CN 202011115109 A CN202011115109 A CN 202011115109A CN 112379703 B CN112379703 B CN 112379703B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/01—Control of temperature without auxiliary power
- G05D23/13—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures
- G05D23/1306—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures for liquids
- G05D23/132—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures for liquids with temperature sensing element
- G05D23/1366—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures for liquids with temperature sensing element using a plurality of sensing elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0012—Recuperative heat exchangers the heat being recuperated from waste water or from condensates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/01—Control of temperature without auxiliary power
- G05D23/13—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures
- G05D23/1393—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures characterised by the use of electric means
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Abstract
The invention discloses a printing and dyeing wastewater waste heat recycling system based on differential temperature regulation, which comprises a regulating water tank, a cooling water tank, a steam input device and a plurality of dyeing machines, wherein a process water pipeline is arranged in the regulating water tank, each dyeing machine is communicated with the process water pipeline through a water inlet pipeline so that process water flows into each dyeing machine, and high-temperature water generated after the steam input device and the cooling water tank work flows back into the regulating water tank; the water inlet pipeline is provided with a temperature control mixed flow valve for mixing normal temperature water and high temperature water, and the water inlet pipeline is provided with a temperature detector; the temperature measuring device further comprises a data transmission module and a computer server, wherein the data transmission module transmits the temperature data measured by the temperature measuring device to the computer server. The invention can automatically adjust the inlet water temperature of the process water according to each dyeing machine to enable the inlet water temperature to reach or approach the design value, thereby recycling more waste heat resources and improving the heat energy utilization rate.
Description
Technical Field
The invention relates to the technical field of energy conservation in the printing and dyeing industry, in particular to a printing and dyeing wastewater waste heat recycling system based on differential temperature regulation.
Background
The printing and dyeing industry is used as an energy consumer, mainly uses low-pressure steam as heat energy and is used for dyeing processing. The basic processing flow of dyeing is that after the process water and cloth are conveyed into a dyeing machine, the steam is started according to the set conditions of the process to carry out the temperature rise stage with controllable temperature rise rate until the process temperature is reached (for example, about 130 ℃ in the common process), then the heat preservation stage and the temperature reduction stage are carried out until the whole process is finished, the heat is mainly used in the temperature rise stage of the process water and the cloth in the whole process, and the subsequent heat preservation and temperature reduction stage is mainly used for keeping the process temperature stable.
A large amount of dyeing high-temperature wastewater is generated in the whole processing process, enters a wastewater treatment system, and sometimes, due to too high temperature, the biochemical treatment can be carried out only after the temperature is reduced, so that a large amount of heat and electric power are wasted. Due to the characteristics of the dyeing process, the temperature rising process and the initial temperature of the dyeing process water are set according to the material and the dye performance of the cloth, and the higher the water inlet temperature is, the less the subsequent steam is used. The process water of the printing and dyeing enterprises is generally supplied in a uniform mode, and the process water with the set required temperature cannot be independently supplied to each dyeing machine, namely the water supply with temperature difference cannot be realized according to the requirements of different process temperature starting points of each dyeing machine. The water supply can be carried out according to a uniform temperature, and the temperature is configured according to the minimum process water temperature value required by all dyeing machines (for example, three varieties require that the water inlet temperature cannot be higher than 30, 35 and 40 ℃, the water supply temperature of the system can be controlled to be 30 ℃ only, and 30 ℃ variety scrapping is possibly caused when the water supply temperature exceeds 30 ℃), so that the dyeing quality of the product can be ensured. For some varieties which can adopt higher initial temperature, the water can only be fed at uniform lower temperature, so that the waste heat cannot be fully utilized, and the steam quantity required by temperature rise is increased.
Disclosure of Invention
The invention aims to provide a dyeing wastewater waste heat recycling system based on differential temperature regulation and control, which can adjust the temperature of process water according to different dyeing processes, cloth and dyes of each dyeing machine, so that the temperature of inlet water reaches or approaches the maximum value allowed by design, thereby recycling more waste heat resources, improving the utilization rate of heat energy and obviously reducing energy consumption.
In order to achieve the purpose, the invention provides the following technical scheme: the system comprises a regulating water pool, a cooling water pool, a steam input device and a plurality of dyeing machines, wherein the regulating water pool is used for storing process water, a process water pipeline is arranged in the regulating water pool, each dyeing machine is communicated with the process water pipeline through a water inlet pipeline so that the process water is input into each dyeing machine, the steam input device is used for heating the process water in the dyeing machines, and a cooling water pipeline flowing through the dyeing machines is arranged in the cooling water pool so as to cool the process water in the dyeing machines; the normal-temperature water tank is used for storing normal-temperature water, a normal-temperature water pipeline is arranged in the normal-temperature water tank, a temperature-control mixed flow valve is arranged on a water inlet pipeline, the normal-temperature water pipeline is communicated with a bypass port of the temperature-control mixed flow valve, and a temperature detector used for measuring the temperature of process water is arranged on the water inlet pipeline on the water outlet side of the temperature-control mixed flow valve; the temperature control mixed flow valve is characterized by further comprising a data transmission module and a computer server, the data transmission module transmits temperature data measured by the temperature measurer to the computer server, the computer server analyzes and sends signals to the control module, and the control module controls the temperature control mixed flow valve according to the control signals so as to independently control the temperature of process water input into each dyeing machine.
By adopting the technical scheme, the condensed water generated by the steam input device and the cooling water in the cooling pipeline are directly recycled as the process water to form a closed cycle, the consumption of water resources is reduced firstly, then the steam condensed water (above 90 ℃) generated by the steam input device and the cooling water (controlling the flow rate and enabling the temperature to reach a required value) in the cooling pipeline still have higher temperature, the condensed water is used as the process water to be heated without consuming extra energy, the requirement of the inlet temperature of the process water can be met by depending on waste heat, and the energy consumption is reduced; in addition, a temperature control mixed flow valve is arranged in front of a water inlet pipeline of each dyeing machine, a process water pipeline and a normal temperature water pipeline are connected to the temperature control mixed flow valve, the highest allowable water inlet temperature of the batch of processes is set in a computer server according to the batch process requirement of each dyeing machine, the flow ratio of high-temperature water from a process water pipeline and normal temperature water from a normal temperature water pipeline is automatically adjusted by the temperature control mixed flow valve according to the set value, process water meeting the set temperature is output to the dyeing machine, the highest allowable water inlet temperature can be independently set by each dyeing machine, adjustment and control of the water inlet temperature of differentiated process water are realized, the process water temperature can be automatically adjusted according to different dyeing processes, cloth and dyes of each dyeing machine, the water inlet temperature of the process water reaches or approaches to the highest allowable design value, and more waste heat resources are recycled, the heat energy utilization rate is improved, and the steam quantity required by subsequent temperature rise is reduced.
The invention is further configured to: the process water pipeline is provided with a process water pump, and a water outlet and a water return port of the process water pipeline are both arranged at different positions in the regulating water tank, so that the process water forms a circulating flow state in the process water pipeline, and the temperature of the process water is basically consistent before reaching the mixed flow valve at the inlet of each dyeing machine. Through this setting, reform transform into original single line water supply pipe for delivery port, return water mouth all the circulation process water pipeline in the regulation pond, practiced thrift the water resource on the one hand, on the other hand process water pump can adjust operating condition according to the temperature difference of delivery port, return water mouth.
The invention is further configured to: the water outlet of the process water pipeline is provided with a process water outlet temperature detector, the water return port of the process water pipeline is provided with a process water return temperature detector, the adjusting water pool is internally provided with an adjusting water pool temperature detector, the normal temperature water pool temperature detector is arranged in the normal temperature water pool, the cooling water pool temperature detector is arranged in the cooling water pool, and the data transmission module transmits the temperatures measured by the process water outlet temperature detector, the process water return temperature detector, the adjusting water pool temperature detector, the normal temperature water pool temperature detector and the cooling water pool temperature detector to the computer server for processing. Through this setting, all set up temperature acquisition point in each pond, also set up temperature acquisition point on the inlet channel of every dyeing machine, also set up temperature acquisition point on the main process water pipeline, gather the signal in real time, send computer server to handle, the process water temperature of final accurate control input dyeing machine to can realize the differentiation management of process water temperature according to the different demands of every dyeing machine.
The invention is further configured to: through the pipeline intercommunication so that normal atmospheric temperature hydroenergy inputs the cooling pond from normal atmospheric temperature pond between normal atmospheric temperature pond and the cooling rivers, be used for supplementing the cooling water yield on one hand, reduce the temperature of cooling water on the other hand, improve the cooling effect. Through this setting, normal atmospheric temperature water in the normal atmospheric temperature pond has the effect of mixing high-temperature water promptly, can directly cool down process water and cloth as the water source of the cooling water in the cooling pond again, make full use of water resource.
The invention is further configured to: the dyeing machine is provided with a cooling water loop, the cooling water loop is sequentially communicated with a cooling water pool and an adjusting water pool, the cooling water loop is provided with a cooling reflux water temperature detector, and the data transmission module transmits the temperature measured by the cooling reflux water temperature detector to a computer server for processing. Through the arrangement, the cooling water can flow back to the regulating water pool after cooling the process water and the cloth in the dyeing machine to be input into a process water pipeline for recycling or flow back to the cooling water pool for recycling (when the temperature of the return water is lower), and a temperature acquisition point is arranged, so that signals are acquired in real time and sent to a computer server for processing.
The invention is further configured to: and a steam condensation water pipeline is arranged on the dyeing machine and is communicated with the regulating water tank. Through this setting, after the process water in the dyeing machine is heated through steam input device, steam condensate can flow back to the regulation pond through steam condensate water pipeline, inputs process water pipeline circulation as initial process water and uses, and the heat has carried out whole recycle again.
The invention is further configured to: the dyeing machine is characterized by further comprising a dyeing wastewater pool, a high-temperature dyeing wastewater discharge pipeline is arranged on the dyeing machine and communicated with the dyeing wastewater pool, the high-temperature dyeing wastewater discharge pipeline is used for discharging process water after dyeing, a high-temperature dyeing wastewater temperature detector is arranged on the high-temperature dyeing wastewater discharge pipeline, and the data transmission module transmits the temperature measured by the high-temperature dyeing wastewater temperature detector to a computer server for processing. Through the arrangement, the dyeing wastewater tank is used for storing high-temperature process water after dyeing, the part of process water is not recycled as wastewater, but the part of wastewater still has higher heat (the emission temperature is above 80 ℃), the waste heat in the wastewater can provide part of heat sources for the process water (according to heat balance calculation, the waste heat in spring, autumn and summer does not need to be recycled, and the waste heat of steam condensate and cooling water can meet the requirement of raising the temperature of the process water to the highest inlet water temperature required by most processes.
The invention is further configured to: the dyeing machine is characterized by further comprising a cleaning water tank, wherein a cleaning water pipeline is arranged in the cleaning water tank and communicated with each dyeing machine, a cleaning wastewater discharge pipeline is arranged on each dyeing machine and communicated with the dyeing wastewater tank. Through this setting, can wash the dyeing machine to washing waste water can leave in the dyeing wastewater disposal basin, in order to treat follow-up waste water treatment. If the temperature is lower, the waste water is directly discharged to a total waste water treatment system of an enterprise for treatment.
The invention is further configured to: the dyeing wastewater tank is internally provided with a heat exchanger, the regulating water tank is provided with a heat exchange loop, a water outlet and a water return port of the heat exchange loop are arranged at different positions in the regulating water tank, and the heat exchanger is arranged on the heat exchange loop. Through this setting, dyeing process waste water can retrieve the heat through the heat exchanger, can provide partial heat source for the process water in the regulation pond winter, and further make full use of waste heat improves the energy rate of utilization.
The invention has the advantages that: 1) condensed water generated by the steam input device and cooling water in the cooling pipeline are directly recycled and used as process water for recycling, so that the consumption of water resources is reduced, the steam condensed water generated by the steam input device and the cooling water in the cooling pipeline still have higher temperature, the condensed water is used as the process water, extra energy is not required to be consumed for heating, the highest requirement on the inlet water temperature allowed by the process water can be met by depending on waste heat, and the energy consumption is reduced;
2) the process water pipeline and the normal-temperature water pipeline are connected to each dyeing machine, the temperature control mixed flow valve is arranged on the water inlet pipeline of each dyeing machine, the highest allowable water inlet temperature is set in the computer server according to the process requirement of each batch of dyeing machine, the flow ratio of the high-temperature water from the process water pipeline and the normal-temperature water from the normal-temperature water pipeline is automatically adjusted by the temperature control mixed flow valve according to the set value, the process water meeting the set temperature is output to the dyeing machine, each dyeing machine can independently set the highest allowable water inlet temperature, adjustment and control of the differentiated process water inlet temperature are achieved, accordingly more waste heat resources are recycled, and the heat energy utilization rate is improved.
3) The invention does not need manual intervention, automatically establishes the balance of heat and water quantity through the control of each temperature acquisition point and the computer system, and improves the automation level and the production efficiency.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a thermostatic mixed flow valve according to an embodiment of the present invention.
Reference numerals: a regulating water tank 1, a cooling water tank 2, a steam input device 3, a dyeing machine 4, a process water pipeline 5, a water inlet pipeline 6, a normal-temperature water tank 7, a normal-temperature water pipeline 8, a temperature-control mixed flow valve 9, a thermometer 10, a data transmission module 11, a computer server 12, a process water pump 13, a process water outlet thermometer 14, a process water return thermometer 15, a regulating water tank thermometer 16, a normal-temperature water tank thermometer 17, a cooling water tank thermometer 18, a steam condensate water pipeline 19, a dyeing wastewater tank 20, a high-temperature dyeing wastewater discharge pipeline 21, a high-temperature dyeing wastewater thermometer 22, a cleaning water tank 23, a cleaning water pipeline 24, a cleaning wastewater discharge pipeline 25, a heat exchanger 26, a heat exchange loop 27, a cooling water loop 28, a cooling return water thermometer 29, a steam flowmeter 30, a water flowmeter 31, a liquid level controller 32, a bypass port 33 of the mixed flow temperature control valve, a water outlet 34 of the mixed flow valve, A cooling water line 35.
Detailed Description
In the description of the present embodiment, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention is further described with reference to the drawings and the specific embodiments in the following description.
Firstly, a specific process flow of the dyeing machine is briefly described, wherein the process water is water for dyeing (the process water is generally clear water and has special water quality detailed parameter index requirements) determined according to process conditions, the initial temperature is limited to the highest value generally according to the difference of varieties, cloth materials and dyes, the temperature can only be gradually increased from the normal temperature, and the temperature can not be higher than 40 ℃, 50 ℃, 60 ℃ and the like. After the process water and cloth are conveyed into a dyeing machine, steam is started according to the process set conditions, and the temperature is raised in a stage of temperature rise curve control until the process temperature is reached (for example, the temperature is about 130 ℃ in the common process). In the initial stage of the process, various dyes are added in batches, and then the temperature rise period and the temperature period are carried out until the whole process is finished. After the whole dyeing process is finished, the process water and the cloth in the dyeing machine need to be cooled firstly, usually, spacer cooling water is adopted for cooling, after the temperature in the dyeing machine is reduced to a set temperature (usually about 85 ℃), dyeing wastewater is discharged (the temperature is still very high and is more than 80 ℃), then the dyeing machine and the cloth are cleaned for a plurality of times, and then the material is discharged for the next dyeing cycle.
Based on the process flows and referring to fig. 1 and 2, the system for recycling the waste heat of the printing and dyeing wastewater based on differential temperature regulation and control disclosed by the invention comprises a regulating water tank 1, a cooling water tank 2, a steam input device 3 and a plurality of dyeing machines 4, wherein the regulating water tank is used for storing process water, a process water pipeline 5 is arranged in the regulating water tank, each dyeing machine is communicated with the process water pipeline through a water inlet pipeline 6 so that the process water is input into each dyeing machine, the steam input device is used for heating the process water in the dyeing machine, a cooling water pipeline 35 flowing through the dyeing machine is arranged in the cooling water tank so as to cool the process water and cloth in the dyeing machine, high-temperature water generated after the steam input device and the cooling water tank work flows back to the regulating water tank, controlling the cooling water quantity, and ensuring that the temperature of the cooling reflux water reaches above the maximum water inlet temperature value of the process water allowed by design; the normal temperature water storage tank 7 is used for storing normal temperature water, a normal temperature water pipeline 8 is arranged in the normal temperature water storage tank, a temperature control mixed flow valve 9 is arranged on a water inlet pipeline, the normal temperature water pipeline is communicated with a bypass port 33 of the temperature control mixed flow valve, and a temperature detector 10 used for measuring the temperature of process water is arranged on the water inlet pipeline on the side of a water outlet 34 of the temperature control mixed flow valve; the temperature control system further comprises a data transmission module 11 and a computer server 12, the data transmission module transmits temperature data measured by the temperature measurer to the computer server, the computer server analyzes and sends signals to the control module, and the control module controls the temperature control mixed flow valve according to the control signals so as to independently control the temperature of process water input into each dyeing machine. Condensed water generated by the steam input device and cooling water in the cooling pipeline are directly recycled as process water to form a closed cycle, the consumption of water resources is reduced, and then the condensed water generated by the steam input device and the cooling water in the cooling pipeline still have higher temperature and are used as the process water to be heated without consuming extra energy, the requirement of the inlet temperature of the process water can be met by depending on waste heat, and the energy consumption is reduced; in addition, a temperature control mixed flow valve is arranged in front of a water inlet pipeline of each dyeing machine, a process water pipeline and a normal temperature water pipeline are connected to the temperature control mixed flow valve, the highest allowable water inlet temperature is set in a computer server according to the process requirement of the batch of each dyeing machine, the temperature control mixed flow valve automatically adjusts the flow ratio of high-temperature water from the process water pipeline and normal temperature water from the normal temperature water pipeline according to the set value, and process water meeting the set temperature is output to the dyeing machine. Because the temperature of the process water from the regulating water tank is higher than the highest water inlet temperature allowed by all dyeing machines, each dyeing machine can independently set the highest allowed water inlet temperature, the adjustment control of the differentiated process water inlet temperature is realized through the mixed flow with normal-temperature water, and the temperature of the process water can be automatically regulated aiming at different dyeing machines due to different dyeing processes, cloth and dyes, so that the water inlet temperature of the process water reaches or approaches the highest allowed value, more waste heat resources are recycled, and the heat energy utilization rate is improved.
The process water pipeline is provided with a process water pump 13, a water outlet and a water return port of the process water pipeline are arranged at different positions in the regulating water tank, so that the process water is circulated in the process water pipeline, the process water temperature before reaching the mixed flow valves of each dyeing machine is basically kept consistent, the original single-line water supply pipeline is transformed into the circulating process water pipeline with the water outlet and the water return port both in the regulating water tank, on one hand, water resources are saved, and on the other hand, the process water pump can automatically adjust the working state (the rotating speed of the variable-frequency control water pump) according to the temperature difference of the water outlet and the water return port.
The water outlet of the process water pipeline is provided with a process water outlet temperature detector 14, the water return port of the process water pipeline is provided with a process water return temperature detector 15, the regulating water pool is provided with a regulating water pool temperature detector 16, the normal temperature water pool is provided with a normal temperature water pool temperature detector 17, the cooling water pool is provided with a cooling water pool temperature detector 18, and the data transmission module transmits the temperatures measured by the process water outlet temperature detector, the process water return temperature detector, the regulating water pool temperature detector, the normal temperature water pool temperature detector and the cooling water pool temperature detector to the computer server for processing. Temperature collecting points are arranged in each water pool, a water inlet pipeline of each dyeing machine is also provided with the temperature collecting points, a main process water pipeline is also provided with the temperature collecting points, signals are collected in real time and sent to a computer server for processing, the process water temperature input into the dyeing machine is finally accurately controlled, and differential management of the process water temperature can be realized according to different requirements of each dyeing machine.
The dyeing machine is provided with a steam condensation water pipeline 19 which is communicated with the regulating water tank. After the process water in the dyeing machine is heated by the steam input device, the steam condensate water can flow back to the regulating water tank through the steam condensate water pipeline and is input into the process water pipeline for recycling as the initial process water, and the heat is also completely recycled.
The dyeing machine is characterized by further comprising a dyeing wastewater pool 20, wherein a high-temperature dyeing wastewater discharge pipeline 21 is arranged on the dyeing machine and communicated with the dyeing wastewater pool, the high-temperature dyeing wastewater discharge pipeline is used for discharging process water after dyeing, a high-temperature dyeing wastewater temperature detector 22 is arranged on the high-temperature dyeing wastewater discharge pipeline, and the data transmission module transmits the temperature measured by the high-temperature dyeing wastewater temperature detector to a computer server for processing. The dyeing wastewater tank is used for storing dyed process water, the part of process water is not recycled as wastewater, but the part of wastewater still has higher heat, and the part of wastewater can be used as waste heat in winter to provide a part of heat source for the process water, so that a heat exchanger and a temperature acquisition point are also arranged, signals can be acquired in real time, and the signals are sent to a computer server for processing. Whether to open the use is decided according to the temperature of adjusting pond water and the temperature of dyeing wastewater disposal basin, and the starting use is considered under the condition that the steam condensate water and the cooling water residual heat are not enough to enable the temperature of the process water to reach the allowable maximum value. According to the energy balance measurement, the starting condition is only met under the condition of extremely cold weather. Even if started, the waste heat in the process wastewater only needs to be recovered by about 1/3 to meet the requirement.
The dyeing machine is characterized by further comprising a cleaning water tank 23, wherein a cleaning water pipeline 24 is arranged in the cleaning water tank, the cleaning water pipeline is communicated with each dyeing machine, a cleaning wastewater discharge pipeline 25 is arranged on each dyeing machine, and the cleaning wastewater discharge pipeline is communicated with the dyeing wastewater tank. The dyeing machine can be cleaned, and the cleaning wastewater can be stored in a dyeing wastewater pool for subsequent wastewater treatment.
The dyeing wastewater tank is internally provided with a heat exchanger 26, the regulating water tank is provided with a heat exchange loop 27, a water outlet and a water return port of the heat exchange loop are both arranged in the regulating water tank, and the heat exchanger is arranged on the heat exchange loop from the regulating water tank to the dyeing wastewater tank. The dyeing process wastewater can recover heat through the heat exchanger, provides partial heat source for adjusting the process water in the water tank, fully utilizes waste heat, and improves the energy utilization rate.
The normal temperature water tank is communicated with the cooling water tank through a pipeline so that normal temperature water can be input into the cooling water tank from the normal temperature water tank, the normal temperature water tank is used for supplementing cooling water, the temperature of the cooling water is reduced, and the cooling efficiency is improved. Normal temperature water in the normal temperature water tank has the effect of mixing high temperature water, and can be directly used as a water source of cooling water in the cooling water tank to cool process water and cloth, so that the water resource is fully utilized.
Be equipped with cooling water return circuit 28 on the dyeing machine, cooling water return circuit communicates with cooling pond and regulation pond in proper order, is equipped with cooling backward flow water thermoscope 29 on the cooling water return circuit, and the data transmission module transmits the temperature that cooling backward flow water thermoscope measured to computer server and handles. The cooling water cools the process water and the cloth in the dyeing machine, and then the process water and the cloth can flow back to the regulating pool to be input into a process water pipeline as initial process water for recycling, or return to the cooling pool for recycling (under the condition that the temperature is too low and does not reach the condition of entering the regulating pool), and a temperature collecting point is set, so that signals are collected in real time and sent to a computer server for processing.
With reference to this embodiment, a specific process of the dyeing machine is illustrated, after the process water and the cloth material subjected to temperature adjustment and mixing are conveyed into the dyeing machine, steam is started according to a process setting condition to perform temperature rise at a controllable temperature curve stage until a process temperature is reached (for example, about 130 ℃ in a common process), the temperature of the process water and the cloth material fed into the dyeing machine directly determines the amount of steam required for subsequent temperature rise, the lower the initial temperature is, the larger the amount of steam is, and then a heat preservation period is performed until the whole process is finished. The whole process mainly uses heat in the temperature rising stage of process water and cloth, and the subsequent heat preservation and temperature reduction stages mainly keep the process temperature stable, and the required heat and the system heat dissipation are just balanced. When the whole dyeing process is finished, the process water and the cloth in the dyeing machine need to be cooled firstly. The method is characterized in that a spacer sleeve circulating water cooling mode is adopted, normal-temperature water is used for carrying out heat exchange cooling through a heat exchanger, dyeing wastewater is discharged (the temperature is still high and is over 80 ℃) after the temperature in a dyeing machine is reduced to a set temperature (generally about 85 ℃), then primary cleaning is carried out, the cleaned wastewater is directly discharged to a dyeing wastewater tank, secondary cleaning (or multiple cleaning) is carried out, cleaning water is discharged to a cleaning water tank, and the secondary cleaning water is used for the primary cleaning of the next batch of dyeing process.
In order to better realize the embodiment, a steam flowmeter 30 is arranged on the steam input device, and signals are digitalized and then transmitted to a computer server for processing in real time. A water flow meter 31 is arranged on a water outlet and a water return opening of the regulating water pool, actual water consumption is measured (the difference between the water outlet flow and the water return flow is the actual water consumption), a water flow meter and a flow control valve are arranged at the outlet end of the cooling water pool and used for controlling the temperature of returned cooling water, ensuring that the temperature is higher than the highest allowable process water temperature of the system, and supplementing the temperature to the regulating water pool. The regulating water tank, the normal temperature water tank, the cooling water tank and the cleaning water tank are respectively provided with a liquid level controller 32 to prevent overflow. Once the high level is reached, the water replenishment or direct discharge is stopped. The temperature and the water level of the regulating water tank are controlled preferentially, the temperature and the water quantity of the process water are ensured to meet the requirements, and the waste heat is fully recovered. And the redundant part of the cooling water enters a cleaning water tank for first cleaning, and is directly discharged after cleaning, so that the capacity of the water tank is not occupied.
Through the above description, the present embodiment establishes water balance and heat balance:
1) and (4) water balancing.
The water fed to the dyeing machine comprises: process water, normal temperature water and cleaning water.
The water exiting the dyeing machine comprises: dyeing process wastewater, cloth carrying-over wastewater, cooling water, cleaning wastewater and steam condensate water.
The steam condensate in the discharged water is converted after the heat of the steam is released, and the balance of the inlet and outlet holding amount of other water is basically consistent with the steam amount. Wherein the cooling water and the steam condensate water are directly recycled. The adjusting water tank is used for storing the process water after waste heat recovery, and the water source is from cooling water, steam condensate water and emergency supplementary normal-temperature fresh water.
2) And (4) heat balancing.
Inputting heat: the heat is brought by steam, the heat is brought by process water, the heat is brought by cleaning water, and the heat is brought by cloth.
Discharging heat: the dyeing process comprises the steps of carrying out heat by wastewater, carrying out heat by cloth, carrying out heat by cooling water, carrying out heat by steam condensate, carrying out heat by cleaning water and radiating heat by equipment.
Wherein the cooling water and the steam condensate water are directly recycled, and the dyeing process wastewater can be subjected to heat recovery through a heat exchanger.
In order to achieve the purpose that the inlet water temperature of the process water of each dyeing machine can be configured according to the process requirement, the water temperature of the regulating water tank is controlled to be higher than the highest value allowed by the process requirement in all the dyeing machines (if 100 dyeing machines exist, 30 dyeing machines are required to be controlled to be not higher than 35 ℃, 40 dyeing machines are required to be controlled to be not higher than 40 ℃, 30 dyeing machines are required to be controlled to be not higher than 45 ℃, the water temperature of the regulating water tank is controlled to be higher than 45 ℃, and the water temperature is controlled to be about 50 ℃ by considering heat dissipation factors). The method is characterized in that a circulating process water pipeline (enabling the water temperature in the process water pipeline to keep basic consistency and preventing the temperature in the process water pipeline from being reduced or uneven due to intermittent water supply) is additionally arranged in a dyeing workshop, a normal-temperature water pipeline is connected to each dyeing machine, a temperature control mixed flow valve is arranged in front of a water inlet pipeline of each dyeing machine, the highest allowable process water inlet temperature is set in a computer system according to the process requirement of each batch of dyeing machine, the temperature control mixed flow valve automatically adjusts the flow ratio of high-temperature water and normal-temperature water from the process water pipeline according to the set value, process water meeting the set temperature is output to the dyeing machine, each dyeing machine can be independently set, and differential inlet water temperature adjustment control is achieved.
If the inlet water temperature of the process water reaches the set value of the process requirement by utilizing the recovered waste heat, the recovered heat and the grade are required to be higher than the heat and the grade required by temperature rise (namely the total heat is higher than the required heat, and the temperature is higher than the allowable maximum temperature). In the whole dyeing process, the waste heat resource is divided into two parts, namely, the waste heat brought out by cooling water (the cooling section is 130-85 ℃ and comprises the heat of process water and cloth), and the waste heat brought out by dyeing wastewater (the temperature is 85-15 ℃ and the annual average temperature is set to be 15 ℃). Because the dyeing process water amount is larger than the high-temperature dyeing wastewater amount (water amount absorbed by cloth is not contained), the general process requires that the process inlet water temperature does not exceed 50 ℃, and then the high dye characteristic changes to cause product rejection, the temperature rise section is required to be 15-50 ℃ and 35 ℃ according to the annual average temperature of 15 ℃. Under extreme climatic conditions, the lower limit temperature is 0 ℃, the temperature rise section is 0-50 ℃, and the temperature rise is 50 ℃. The temperature range of heat in the process water and the cloth is 130-85 ℃, 45 ℃ temperature difference exists, the conversion recovery efficiency (80%) is considered, the temperature difference is at least 36 ℃, under the condition of non-extreme climate, the water temperature in the regulating water tank can be ensured to reach more than 50 ℃ by utilizing the waste heat of the cooling water, and the heat of the steam condensate water can meet the water inlet temperature requirement of most dyeing processes without recovering the heat in the dyeing wastewater. Under extreme climatic conditions, heat can be further recovered through a heat exchanger arranged in the high-temperature wastewater tank, the water temperature in the regulating water tank is improved, and waste heat resources are recovered to a greater extent.
If the refined control of the inlet water temperature of the process water is to be realized, the quantity of the recovered waste heat and the grade of the waste heat need to be quantitatively analyzed and controlled, and meanwhile, the water temperature of the regulating water tank is ensured to meet the requirement of the highest allowable value in the system. The method is characterized in that parameters such as steam flow, process water quantity, process water outlet temperature, process water backflow temperature, waste water temperature and waste water flow in the whole system are collected and digitized by adopting a computer digital intensive control technology, then the parameters are sent to a computer system for analysis, the supplement quantity of the process water is automatically determined according to the effluent and return water temperatures of the process water, the heat quantity of condensed water is calculated according to the real-time steam flow, and the optimal state of the process water flow is ensured by predicting the total temperature of a regulating water tank (the cooling water backflow temperature is high and has poor cooling effect, the temperature is low and the waste heat quality difference cannot be utilized). Once the inlet water temperature of the process water is set on each dyeing machine process computer, signals are automatically transmitted to the temperature control mixed flow valve, the temperature of the process water and the temperature of the normal temperature water are automatically measured, and the proportion of the high-temperature process water/the normal temperature water is adjusted in real time to quickly realize temperature synchronization. Because the temperature difference range between winter and summer has great influence on the utilization degree of the waste heat, most of the waste heat in summer cannot be utilized, and the waste heat in winter is slightly deficient, the influence of seasonal factors is considered, the temperature of the water pool is taken as a reference point, redundant waste heat resources are not utilized, the waste heat resources are directly discharged, the energy consumption of the system is reduced, the volume of each water pool is reduced, and valuable land and space resources are saved.
The technical scheme of the embodiment does not need manual intervention, and automatically establishes the balance of heat and water quantity. At the beginning of the system starting, if all the water tanks are in a normal temperature state (if the system is started again when the production is stopped too much), when the temperature of the adjusting water tank and the temperature reduction water tank is detected to be lower than a set temperature value, the system directly opens a process water pipeline valve in the temperature control mixed flow valve, closes a normal temperature water pipeline valve to feed water, and starts steam heating. The steam condensate water gradually enters the regulating water pool through the steam condensate water pipeline, after a dyeing period is finished, along with the progress of a cooling process, returned cooling water enters the regulating water pool, the temperature of the regulating water pool gradually rises, and when the return water temperature of the cooling water is lower than the process water temperature set by the regulating water pool, the flow of the cooling water is automatically controlled to improve the return temperature of the cooling water until the temperature set point of the regulating water pool is reached. When the temperature of the regulating pool gradually rises and reaches the maximum allowable temperature value set by the water inlet of part of the dyeing machines, the dyeing machines start automatic water inlet temperature regulation and control, so that the water inlet temperature of the process water meets the requirement, and other dyeing machines which do not reach the set value continue the original working mode until the temperature of the circulating water reaches the set temperature, and then start the regulation and control function. The whole process is carried out automatically in a full-intelligent mode, manual interference is not needed, and seamless connection is achieved. Because the water taking process from the regulating pool is carried out discontinuously, the balancing process is also carried out intermittently and takes place all the time, the water quantity and the water temperature of the regulating pool are taken as the target values, and after the balance is achieved, more waste heat is recovered and returned to the dyeing machine, so that the waste heat can not be utilized. The influence of season factors is very large, the utilization rate of waste heat in summer is very low, the heat preservation condition is not ideal under the extremely cold condition in winter, and a dyeing wastewater waste heat recovery device (heat exchanger) can be started to meet the requirement.
The above embodiments are described in detail for the purpose of further illustrating the present invention and should not be construed as limiting the scope of the present invention, and the skilled engineer can make insubstantial modifications and variations of the present invention based on the above disclosure.
Claims (8)
1. The system comprises a regulating water pool, a cooling water pool, a steam input device and a plurality of dyeing machines, wherein the regulating water pool is used for storing process water, a process water pipeline is arranged in the regulating water pool, each dyeing machine is communicated with the process water pipeline through a water inlet pipeline so that the process water is input into each dyeing machine, the steam input device is used for heating the process water in the dyeing machines, and a cooling water pipeline flowing through the dyeing machines is arranged in the cooling water pool so as to cool the process water in the dyeing machines;
the normal-temperature water tank is used for storing normal-temperature water, a normal-temperature water pipeline is arranged in the normal-temperature water tank, a temperature-control mixed flow valve is arranged on a water inlet pipeline, the normal-temperature water pipeline is communicated with a bypass port of the temperature-control mixed flow valve, and a temperature detector used for measuring the temperature of process water is arranged on the water inlet pipeline on the water outlet side of the temperature-control mixed flow valve;
the temperature control mixed flow valve is controlled by the control module according to the control signal so as to independently control the temperature of process water input into each dyeing machine;
the process water pipeline is provided with a process water pump, and a water outlet and a water return port of the process water pipeline are both arranged in the regulating water tank, so that the process water forms circulation in the process water pipeline, and the process water temperature before reaching the mixed flow valves of the dyeing machines is ensured to be consistent; the water outlet of the process water pipeline is provided with a process water outlet temperature detector, and the water return port of the process water pipeline is provided with a process water return temperature detector.
2. The system for recycling printing and dyeing wastewater waste heat based on differential temperature regulation and control of claim 1, characterized in that a regulation water pool thermometer is arranged in the regulation water pool, a normal temperature water pool thermometer is arranged in the normal temperature water pool, a cooling water pool thermometer is arranged in the cooling water pool, and the data transmission module transmits the temperatures measured by the process water outlet thermometer, the process water return thermometer, the regulation water pool thermometer, the normal temperature water pool thermometer and the cooling water pool thermometer to the computer server for processing.
3. The printing and dyeing wastewater waste heat recycling system based on differential temperature regulation and control as claimed in claim 1 or 2, characterized in that the normal temperature water tank and the cooling water tank are communicated through a pipeline so that normal temperature water can be input into the cooling water tank from the normal temperature water tank.
4. The printing and dyeing wastewater waste heat recycling system based on differential temperature regulation and control as claimed in claim 1 or 2, characterized in that a cooling water loop is arranged on the dyeing machine, the cooling water loop is sequentially communicated with a cooling water pool and a regulating water pool, a cooling reflux water thermometer is arranged on the cooling water loop, and the data transmission module transmits the temperature measured by the cooling reflux water thermometer to a computer server for processing.
5. The printing and dyeing wastewater waste heat recycling system based on differential temperature regulation and control as claimed in claim 1, characterized in that a steam condensate water pipeline is arranged on the dyeing machine, and the steam condensate water pipeline is communicated with a regulating water tank.
6. The system for recycling printing and dyeing wastewater waste heat based on differential temperature regulation and control of claim 1, characterized by further comprising a dyeing wastewater pool, wherein a high-temperature dyeing wastewater discharge pipeline is arranged on the dyeing machine and communicated with the dyeing wastewater pool, the high-temperature dyeing wastewater discharge pipeline is used for discharging the process water after dyeing, a high-temperature dyeing wastewater thermometer is arranged on the high-temperature dyeing wastewater discharge pipeline, and the data transmission module transmits the temperature measured by the high-temperature dyeing wastewater thermometer to a computer server for processing.
7. The system for recycling printing and dyeing wastewater waste heat based on differential temperature regulation and control of claim 6, characterized by further comprising a cleaning water tank, wherein a cleaning water pipeline is arranged in the cleaning water tank and is communicated with each dyeing machine, a cleaning wastewater discharge pipeline is arranged on each dyeing machine and is communicated with the dyeing wastewater tank.
8. The system for recycling printing and dyeing wastewater waste heat based on differential temperature regulation and control of claim 6, characterized in that a heat exchanger is arranged in the dyeing wastewater pool, a heat exchange loop is arranged on the regulation water pool, a water outlet and a water return port of the heat exchange loop are both arranged in the regulation water pool, and the heat exchanger is arranged on the heat exchange loop.
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