Waste heat recovery control system of setting machine

Abstract

The utility model discloses a waste heat recovery control system of a setting machine. An air injection pump is provided with a first end, a second end and a third end; a hot air pipeline is arranged at the first end of the air injection pump; a second end of the air injection pump is connected with a hot air inlet of the setting machine through a first connecting pipeline; the first heat exchanger is provided with a fresh air inlet, a fresh air outlet, a first waste gas inlet and a first waste gas outlet. The first waste gas inlet is connected with an exhaust outlet of the setting machine; the fresh air inlet is connected with a fresh air pipeline; the fresh air outlet is connected with the third end of the air injection pump through a second connecting pipeline; temperature sensors are arranged on the first connecting pipeline and the second connecting pipeline; and an electric control valve is arranged on the hot air pipeline. According to the heat recovery device, heat in waste hot gas can be recovered, and the recovered heat can be returned to the setting machine to be reused in a mixed supplement mode, so that energy waste is effectively reduced, the temperature requirement of the setting machine during machining is met, and the practicability is high.

Description

Technical Field

[0001] The utility model relates to the field of setting machines, in particular to a waste heat recovery control system for a setting machine. Background Art

[0002] A setting machine is a key device at the end of the dyeing and finishing process, which is a device that uses hot air to dry and finish fabrics and shape them. Generally, the hot air temperature required by the setting machine is 140 - 220 °C. The setting machine provides a heat source for heating air in various ways, and common ones include steam, natural gas, electricity, boiler heat transfer oil, etc. After consuming these heat sources to heat normal temperature air to a high temperature of 140 - 220 °C, it is then transported into the setting machine for use. When the fabric is dried and shaped by high-temperature air, the moisture contained in the fabric and the grease generated by the synthetic chemical drugs contained in the fabric will be discharged under the action of heat. Therefore, the inside of the setting machine body is filled with waste hot air mixed with oil and gas, water vapor, fuel, waste smoke, etc. According to production requirements, this waste hot air will be continuously discharged into the atmosphere after being purified and filtered. The waste hot air contains a large amount of heat energy, and direct discharge causes the heat energy contained in the waste hot air to be completely lost, seriously wasting energy.

[0003] At present, the above waste hot air can be utilized through heat exchange, for example, the heat is recovered and reused through an air-air heat exchanger or an air-water heat exchanger. However, the temperature of the heat recovered above is low, which cannot meet the temperature requirements of the setting machine and cannot be reused by the setting machine, making it difficult to meet the energy-saving requirements of the setting machine. Summary of the Utility Model

[0004] Aiming at the above existing technical problems, the purpose of the utility model is: to propose a waste heat recovery control system for a setting machine, which can recover the heat in the waste hot air and return the recovered heat to the setting machine for reuse through a mixing and supplementing method, so as to effectively reduce energy waste and meet the temperature requirements during the processing of the setting machine, and has strong practicability.

[0005] The technical solution of the utility model is realized as follows: A waste heat recovery control system for a setting machine includes an air jet pump, a hot air pipeline, a first heat exchanger, a second heat exchanger, and a controller;

[0006] The air jet pump has a first end, a second end, and a third end; a hot air pipeline is provided at the first end of the air jet pump; the second end of the air jet pump is connected to the hot air inlet of the setting machine through a first connecting pipeline;

[0007] The first heat exchanger has a fresh air inlet, a fresh air outlet, a first waste gas inlet, and a first waste gas outlet; the first waste gas inlet is connected to the air outlet of the setting machine; a fresh air pipeline is connected to the fresh air inlet; the fresh air outlet is connected to the third end of the air jet pump through a second connecting pipeline;

[0008] Temperature sensors are provided on the first connecting pipe and the second connecting pipe; an electric control valve is provided on the hot air pipe;

[0009] The controller is respectively connected to the electric control valve and two groups of temperature sensors, and is used to control the air flow in the hot air pipe according to the output signal of the temperature sensor and through the electric control valve.

[0010] Further, the waste heat recovery control system includes a second heat exchanger and a hot water tank; the second heat exchanger has a water inlet, a water drain, a second waste gas inlet, and a second waste gas outlet; the second waste gas inlet is connected to the first waste gas outlet; a water inlet pipe is connected to the water inlet; the water drain is connected to the water inlet of the hot water tank.

[0011] Further, a pre-filter is provided on the pipe between the first waste gas inlet and the exhaust port of the stenter; a post-filter is connected to the second waste gas outlet.

[0012] Further, the waste heat recovery control system includes a heat utilization unit; the water inlet of the heat utilization unit is connected to the water outlet of the hot water tank.

[0013] Further, an air filter is provided on the fresh air pipe.

[0014] Further, the waste heat recovery control system includes a hot air generating device for inputting a hot air flow into the hot air pipe.

[0015] Due to the application of the above technical solutions, the utility model has the following advantages compared with the prior art:

[0016] 1. By the combined use of the first heat exchanger and the air ejector pump, during the process of the hot air being input into the stenter through the hot air pipe, under the entrainment of the air ejector pump, the fresh air can automatically enter the first heat exchanger, and after heat exchange with the waste hot gas, it is effectively mixed with the hot air in the hot air pipe in proportion, so that the temperature of the mixed hot air can meet the temperature requirements during the processing of the stenter. In this way, the heat in the waste hot gas can be recovered, and the recovered heat can be returned to the stenter for reuse by means of mixed supplementation, so as to effectively reduce energy waste and has strong practicability.

[0017] 2. By the combined use of a temperature sensor, an electric control valve and a controller, the controller can collect data through the temperature sensor and control the electric control valve to adjust the air flow in the hot air duct through a program, thereby changing the mixing ratio of the hot air in the hot air duct and the fresh air after heat exchange. Furthermore, the fresh air after heat exchange and the hot air in the hot air duct can be mixed and adjusted to the temperature required during the processing of the stenter, and the hot air temperature entering the stenter can be effectively controlled to remain stable, effectively meeting the processing requirements of the stenter.

[0018] 3. By the combined use of the second heat exchanger, the waste hot gas after heat exchange by the first heat exchanger enters the second heat exchanger, and the normal temperature water can enter the second heat exchanger to exchange heat with the waste hot gas again, so as to further recover and reuse the heat in the waste hot gas and further improve the heat recovery effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The technical solution of the present invention will be further described below with reference to the drawings:

[0020] Figure 1 is the system schematic diagram of the present invention;

[0021] Wherein: 1. Air jet pump; 11. First end; 12. Second end; 13. Third end; 2. Hot air duct; 21. First connecting pipe; 22. Second connecting pipe; 23. Fresh air duct; 24. Water inlet pipe; 3. Stenter; 4. First heat exchanger; 5. Second heat exchanger; 6. Electric control valve; 61. Temperature sensor; 62. Controller; 7. Prefilter; 71. Postfilter; 72. Air filter; 8. Hot water tank; 9. Heat using unit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The preferred embodiments of the present invention will be described in detail below with reference to the drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making the protection scope of the present invention more clearly defined.

[0023] As Figure 1Shown is a waste heat recovery control system for a stenter 3 according to this embodiment. Through this waste heat recovery control system, the waste hot air discharged from the stenter 3 can be recovered and reused. The waste heat recovery control system includes an air ejector pump 1, a hot air duct 2, a first heat exchanger 4, a second heat exchanger 5, and a controller 62. Among them, the air ejector pump 1 is a conventional component of the prior art. Three communication ports are formed on the steam ejector pump, and the three communication ports respectively form a first end 11, a second end 12, and a third end 13. Among them, the first end 11 and the third end 13 are for air flow to enter the interior of the air ejector pump 1, and the second end 12 is for air flow to be discharged from the interior of the air ejector pump 1. The first end 11 of the air ejector pump 1 is connected to the hot air duct 2. Through the hot air duct 2, hot air (i.e., hot air flow) can be transported into the air ejector pump 1.

[0024] This embodiment further includes a hot air generating device. The hot air generating device is used to generate a hot air flow and input the hot air flow into the hot air duct 2. The hot air generating device can be a hot air blower in the prior art or a device that heats air through a heat source. Common heat sources include steam, natural gas, electricity, boiler heat transfer oil, etc. In this embodiment, the temperature of the hot air flow entering the hot air duct 2 is not less than 140 °C. The hot air generating device is connected to the controller 62. Through the control of the controller 62, the hot air generating device can change the temperature of the hot air flow in the hot air duct 2 according to actual needs.

[0025] The second end 12 of the aforementioned air injection pump 1 is connected to the hot air inlet of the stenter 3 through the first connection pipe 21. The hot air flow output from the second end 12 of the air injection pump 1 enters the stenter 3 through the hot air inlet for utilization. The aforementioned first heat exchanger 4 is preferably a shell and tube heat exchanger or a vacuum tube heat exchanger of the prior art. The first heat exchanger 4 has a fresh air inlet, a fresh air outlet, a first exhaust gas inlet, and a first exhaust gas outlet. The fresh air inlet and the fresh air outlet are connected, and the first exhaust gas inlet and the first exhaust gas outlet are connected. The first exhaust gas inlet is connected to the exhaust port of the stenter 3. A fresh air pipe 23 is connected to the aforementioned fresh air inlet. The air flow in the external environment can enter the first heat exchanger 4 through the fresh air inlet and discharge from the fresh air outlet. The fresh air outlet is connected to the third end 13 of the air injection pump 1 through the second connection pipe 22. Through the above structural design, the waste hot air formed by the stenter 3 is discharged from the exhaust port, enters the first heat exchanger through the first exhaust gas inlet, and then discharges from the first exhaust gas outlet, while the fresh air in the environment can enter the first heat exchanger through the fresh air inlet and discharge through the fresh air outlet. During this process, heat exchange occurs between the waste hot air and the fresh air. Among them, when the hot air flow is conveyed in the aforementioned hot air pipe 2, under the action of the air injection pump 1, the fresh air can automatically enter the first heat exchanger 4 through the fresh air pipe 23. The fresh air after heat exchange is mixed with the hot air flow in the hot air pipe 2 in proportion in the air injection pump 1 and then output to the stenter 3.

[0026] In this embodiment, temperature sensors 61 are installed on both the first connection pipe 21 and the second connection pipe 22 to measure the temperature data of the air flow in the first connection pipe 21 and the second connection pipe 22 through the temperature sensors 61. The temperature data signal is transmitted back to the controller 62. An electric control valve 6 is installed on the aforementioned hot air pipe 2, and through the electric control valve 6, the flow rate of the hot air flow in the hot air pipe 2 can be controlled. The aforementioned controller 62 is respectively connected to the electric control valve and the two groups of temperature sensors 61 through cables. The controller 62 is embedded with a control program. The controller 62 receives the data signal transmitted back by the temperature sensor 61 and is used to control the opening and closing degree of the electric control valve 6 according to the output signal of the temperature sensor 61, so as to realize the control and regulation of the air flow in the hot air pipe 2.

[0027] The waste heat recovery control system of this embodiment includes a second heat exchanger 5 and a hot water tank 8. The second heat exchanger 5 is preferably a shell-and-tube heat exchanger or a vacuum tube heat exchanger in the prior art. The second heat exchanger 5 has a water inlet, a water drain outlet, a second waste gas inlet, and a second waste gas outlet. Among them, the water inlet and the water drain outlet are connected, and the second waste gas inlet and the second waste gas outlet are connected. The first waste gas outlet of the aforementioned first heat exchanger 4 is connected to the second waste gas outlet through a pipeline, so that the waste hot gas discharged from the first heat exchanger 4 can enter the second heat exchanger 5. A water inlet pipe 24 is connected to the water inlet, and normal temperature water can enter the second heat exchanger 5 through the water inlet pipe 24 and be discharged from the water drain outlet. Through the above structural design, the normal temperature water can exchange heat with the waste hot gas entering the second heat exchanger 5 to form hot water. The aforementioned water drain outlet is connected to the water inlet of the hot water tank 8, and the formed hot water enters the hot water tank 8 for storage. The water outlet of the hot water tank 8 is connected to the water inlet of the heat-using unit 9, and the hot water in the hot water tank 8 is pumped and conveyed to the heat-using unit 9 through a water pump for utilization. The aforementioned heat-using unit 9 is a shower device or a flash evaporation device.

[0028] A pre-filter is installed on the pipeline between the aforementioned first waste gas inlet and the exhaust port of the stenter 3. Through this pre-filter, the waste hot gas discharged from the stenter 3 is preliminarily filtered, and oil, fibers, etc. in the waste hot gas are filtered out. A post-filter 71 is connected to the aforementioned second waste gas outlet. Through this post-filter 71, the waste hot gas discharged from the second heat exchanger 5 is filtered and purified again, so that the waste hot gas meets the emission requirements. Among them, an air filter 72 is installed on the aforementioned fresh air pipeline 23 to filter the air entering the fresh air pipeline 23 and filter out dust and other impurities. The above-mentioned pre-filter, post-filter 71 and air filter 72 are all conventional components in the prior art.

[0029] In this embodiment, according to actual needs, a temperature reduction device can be installed on the first connection pipeline 21. Through this temperature reduction device, the temperature of the mixed hot air flow can be reduced to the temperature required by the stenter 3 to maintain the stability of the hot air temperature entering the stenter 3.

[0030] During specific use, when hot air is input into the shaping machine 3 through the hot air duct 2, and the waste hot air is discharged from the air outlet of the shaping machine 3 and successively enters the first heat exchanger 4 and the second heat exchanger 5, and then is discharged from the second heat exchanger 5. Under the entrainment of the air jet pump 1, fresh air can automatically enter the first heat exchanger 4, and after heat exchange with the waste hot air, it is effectively mixed with the hot air in the hot air duct 2 in proportion, so that the temperature of the mixed hot air can meet the temperature requirement during the processing of the shaping machine 3. Through the above method, the heat in the waste hot air can be recovered, and the recovered heat can be returned to the shaping machine 3 for reuse by means of mixing and supplementing, so as to effectively reduce energy waste. After the waste hot air exchanges heat in the first heat exchanger 4, its temperature decreases to a certain extent, but there is still a large amount of latent heat. The waste hot air after heat exchange then enters the second heat exchanger 5, and the normal temperature water enters the second heat exchanger 5 and exchanges heat with the waste hot air again to further recover and reuse the heat in the waste hot air, so as to further improve the heat recovery effect.

[0031] During the mixing process of the above-mentioned fresh air after heat exchange and the hot air in the hot air duct 2, the temperature sensor 61 detects the temperature of the air flow in the first connecting pipe 21 and the second connecting pipe 22 in real time. The controller 62 controls the opening degree of the electric control valve 6 according to the temperature signal of the temperature sensor 61, so as to adjust the flow rate of the hot air flow in the hot air duct 2 entering the air jet pump 1, and then can change the mixing ratio of the fresh air after heat exchange and the hot air in the hot air duct 2 in the air jet pump 1, so that the temperature of the mixed hot air flow can be adjusted to the temperature required during the processing of the shaping machine 3.

[0032] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A waste heat recovery control system for a setting machine, comprising an air jet pump, a hot air duct, a first heat exchanger, a second heat exchanger, and a controller; characterized in that: The air jet pump has a first end, a second end and a third end; a hot air duct is arranged on the first end of the air jet pump; the second end of the air jet pump is connected to the hot air inlet of the setting machine through a first connecting duct; The first heat exchanger has a fresh air inlet, a fresh air outlet, a first exhaust gas inlet, and a first exhaust gas outlet; the first exhaust gas inlet is connected to the exhaust port of the setting machine; the fresh air inlet is connected to a fresh air duct; the fresh air outlet is connected to the third end of the air injection pump through a second connecting duct; The first connecting pipe and the second connecting pipe are provided with a temperature sensor; the hot air pipe is provided with an electric control valve; The controller is connected to the electric control valve and two groups of temperature sensors respectively, so as to control the air flow in the hot air duct through the electric control valve according to the output signals of the temperature sensors.

2. A waste heat recovery control system for a setting machine according to claim 1, characterized in that: The waste heat recovery control system includes a second heat exchanger and a hot water tank; the second heat exchanger has a water inlet, a drain, a second exhaust gas inlet, and a second exhaust gas outlet; the second exhaust gas inlet is connected to the first exhaust gas outlet; the water inlet is connected to a water inlet pipe; the drain is connected to the water inlet of the hot water tank.

3. A waste heat recovery control system for a setting machine according to claim 2, characterized in that: A pre-filter is arranged on the pipeline between the first exhaust gas inlet and the exhaust port of the setting machine; and a post-filter is connected to the second exhaust gas outlet.

4. A waste heat recovery control system for a setting machine according to claim 1, characterized in that: The waste heat recovery control system comprises a heat using unit; a water inlet of the heat using unit is connected to a water outlet of a hot water tank.

5. The waste heat recovery control system of a setting machine according to claim 1 is characterized in that: An air filter is arranged on the fresh air duct.

6. A waste heat recovery control system for a setting machine according to claim 1, characterized in that: The waste heat recovery control system includes a hot air generating device for inputting a hot air flow into a hot air duct.

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