Energy-saving heat exchanger device for producing high-resilience polyurethane spandex

Abstract

The utility model provides an energy-saving heat exchanger device for producing high-resilience polyurethane spandex. The energy-saving heat exchanger device comprises a circulating fan, an air inlet channel, an air return channel, a total heat exchanger, a total cooler, a heater, a circulating air inlet and a channel air return port, the circulating fan is connected with one side of the total heat exchanger through an air inlet channel, the other side of the total heat exchanger is connected with one side of the heater, and the other side of the heater is connected with the circulating air inlet; the circulating fan is connected with one side of the total cooler through an air return channel, the other side of the total cooler is connected with one side of the total heat exchanger, and the other side of the total heat exchanger is connected with a channel air return port; the total heat exchanger is a three-section heat exchanger, the first heat exchanger is arranged on one side close to the air inlet channel, the first heat exchanger is connected with the second heat exchanger, the second heat exchanger is connected with the third heat exchanger, and the third heat exchanger is connected with the heater and the channel air return port; the spandex production system solves the problem that an original spandex production system is high in energy consumption.

Description

TECHNICAL FIELD

[0001] The utility model belongs to spinning technology field relates to a kind of energy-saving heat exchanger device for high resilience polyurethane spandex production. BACKGROUND

[0002] In spandex production, the spinning dope after spandex polymerization contains about 35% solid content, and the remaining 65% is DMAC solvent. This part of the solvent needs to be evaporated and carried away by the circulating hot air at about 260°C in the duct of dry spinning. About 1% of gaseous DMAC solvent in the circulating hot air needs to be cooled to liquid state for recycling. The duct return air temperature received by the SM system is about 220°C. The hot air passes through the heat exchanger and the surface cooler of the SM system, and the air temperature is reduced to below 12°C. At this time, 90% of the DMAC in the hot air is recovered in liquid state. The 12°C air is pressurized by the SM fan, then passes through the heat exchanger and the hot air heater, and the air temperature is heated to about 260°C before being sent to each spinning duct for spinning. This process is repeated continuously.

[0003] In the original spandex production system, a two-section heat exchanger is used. The original heat exchanger is designed with an inlet air temperature of 220°C and an outlet air temperature of 91°C at the lower part, and an inlet air temperature of 10°C and an outlet air temperature of 110°C at the upper part (average value of 10 lines in the first phase). In the original two-section heat exchanger spandex production system, five coolers are required, resulting in huge energy consumption.

[0004] Furthermore, the two-section heat exchanger utilizes the energy of cold and hot fluids, which easily causes unnecessary energy loss. For a spandex production system that needs to efficiently utilize energy, the original two-section heat exchanger and the five coolers provided for it result in energy consumption and loss that is not conducive to energy saving and environmental protection. Moreover, the heat exchange efficiency and performance are relatively poor. In the spandex production system, the energy consumption of the SM system accounts for about 50% of the total energy consumption. Therefore, the heat exchange efficiency of the heat exchanger is related to the energy saving of the SM system. SUMMARY

[0005] The technical problem to be solved by the utility model is to provide an energy-saving heat exchanger device for high resilience polyurethane spandex production, which replaces the original two-section heat exchanger with a three-section heat exchanger, thereby only requiring three coolers to solve the problem of high energy consumption of the original spandex production system.

[0006] The utility model is implemented as follows:

[0007] The utility model provides an energy-saving heat exchanger device for high resilience polyurethane spandex production, comprising a circulating fan, an air inlet channel, an air return channel, a total heat exchanger, a total cooler, a heater, a circulating air inlet, and a duct air return inlet.

[0008] The circulating fan is connected with one side of the total heat exchanger through the air inlet channel, the other side of the total heat exchanger is connected with one side of the heater, and the other side of the heater is connected with the circulating air inlet.

[0009] The circulating fan is connected with one side of the total cooler through the air return channel, the other side of the total cooler is connected with one side of the total heat exchanger, and the other side of the total heat exchanger is connected with the air return inlet of the duct.

[0010] The total heat exchanger is a three-section heat exchanger, comprising a first heat exchanger, a second heat exchanger and a third heat exchanger.

[0011] The first heat exchanger is arranged on one side of the air inlet channel, the first heat exchanger is connected with the second heat exchanger, the second heat exchanger is connected with the third heat exchanger, and the third heat exchanger is connected with the heater and the air return inlet of the duct.

[0012] Further, the total cooler comprises a first cooler, a second cooler and a third cooler, and circulating water is arranged in the first cooler, the second cooler and the third cooler, and the water temperature of the circulating water is 7 DEG C.

[0013] Further, the heater comprises a heat conduction oil inlet and a heat conduction oil return port, the heat conduction oil inlet is arranged at the lower end of the heater, and the heat conduction oil return port is arranged at the top end of the heater.

[0014] Further, the total heat exchanger further comprises a first circulating air inlet, a first circulating air outlet, a second circulating air inlet and a second circulating air outlet, the first circulating air inlet is arranged between the air inlet channel and the total heat exchanger, the first circulating air outlet is arranged between the total heat exchanger and the heater, the second circulating air inlet is arranged between the air return inlet of the duct and the total heat exchanger, and the second circulating air outlet is arranged between the heat exchanger and the total cooler.

[0015] The utility model discloses the advantages are in:

[0016] The utility model provides a kind of energy-saving heat exchanger device for high resilience polyurethane spandex production, adopt three new heat exchangers, and the design air volume of each SM system is 210Nm 3 / min.In spandex production system, the energy consumption of SM system is about 50% of total energy consumption, so the heat exchange efficiency of heat exchanger is related to the energy-saving of SM system.Three heat exchangers are used compared with prior art, greatly energy saving and consumption reduction;Three heat exchangers have higher heat exchange efficiency and performance stability, and can bring lower operating cost and higher energy utilization efficiency in the long run.

[0017] The calculated electricity saving of each spinning line per hour is 6 KWh, and the standard coal saving of one spinning line per year is as follows: the standard coal heat value is 7000 big calorie (8.141 KW / Kg), without considering the boiler efficiency, the heat conversion is: 323 / 8.141*8760 / 1000=348 tons; the cold conversion is: 186.5 / 8.141*8760 / 1000=200 tons; the electricity saving conversion is: 6 / 8.141*8760 / 1000=6.456 tons, and one spinning line can save 554.5 tons of standard coal per year. About 1100 yuan / ton of coal per ton, the annual saving fund is 554.5*1100=609950 yuan. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be further described below with reference to the accompanying drawings in combination with the embodiments.

[0019] Figure 1 It is a structural schematic view of the utility model device. DETAILED DESCRIPTION

[0020] The technical problem to be solved by the utility model is to provide an energy-saving heat exchanger device for high-rebound polyurethane spandex production, and solve the problem of high energy consumption of the original spandex production system.

[0021] Embodiment one

[0022] The embodiment provides an energy-saving heat exchanger device for high-rebound polyurethane spandex production, as shown in the figure, comprising a circulating fan 1, an air inlet channel 2, a total heat exchanger 3, a heater 4, a circulating air inlet 5, a duct air return 6, a total cooler 7 and an air return channel 8. Figure 1 The circulating fan 1 is connected with one side of the total heat exchanger 3 through the air inlet channel 2, one side of the total heat exchanger 3 is connected with one side of the heater 4, and the other side of the heater 4 is connected with the circulating air inlet 5.

[0023] The heater 4 comprises a heat-conducting oil inlet 401 and a heat-conducting oil return port 402, the heat-conducting oil inlet 401 is arranged at the lower end of the heater 4, and the heat-conducting oil return port 402 is arranged at the top end of the heater 4.

[0024] The circulating fan 1 is connected with one side of the total cooler 7 through the air return channel 8, one side of the total cooler 7 is connected with one side of the total heat exchanger 3, and the other side of the total heat exchanger 3 is connected with the duct air return 6.

[0025] The total cooler comprises a first cooler 701, a second cooler 702 and a third cooler 703.

[0026] The total cooler comprises a first cooler 701, a second cooler 702 and a third cooler 703.

[0027] The first cooler 701, the second cooler 702 and the third cooler 703 are provided with circulating water, and the circulating water has a temperature of 7℃;

[0028] The total heat exchanger 3 is a three-section heat exchanger, comprising a first heat exchanger 301, a second heat exchanger 302 and a third heat exchanger 303;

[0029] The first heat exchanger 301 is arranged on one side of the air inlet channel 2, and the first heat exchanger 301 is connected with the second heat exchanger 302;

[0030] The second heat exchanger 302 is connected with the third heat exchanger 303;

[0031] The third heat exchanger 303 is connected with the heater 4 and the air return port 6 of the duct;

[0032] The total heat exchanger further comprises a first circulating air inlet 304, a first circulating air outlet 305, a second circulating air inlet 306 and a second circulating air outlet 307;

[0033] The first circulating air inlet 304 is arranged between the air inlet channel 2 and the total heat exchanger 3;

[0034] The first circulating air outlet 305 is arranged between the total heat exchanger 3 and the heater 4;

[0035] The second circulating air inlet 306 is arranged between the air return port 6 of the duct and the total heat exchanger 3;

[0036] The second circulating air outlet 307 is arranged between the heat exchanger 3 and the total cooler 7.

[0037] During the production of spandex, the circulating fan 1 blows air through the air inlet channel 2, and the 20℃ circulating hot air is sent into the total heat exchanger 3 through the first circulating air inlet 304. The 20℃ circulating hot air passes through the first heat exchanger 301, the second heat exchanger 302 and the third heat exchanger 303, and the air temperature rises to 180℃. The circulating hot air enters the heater 4 through the first circulating air outlet 305, is heated to 260℃, and then flows out through the circulating air inlet 5. The 260℃ circulating hot air enters the duct of the dry spinning (not shown in the figure), and evaporates the remaining DMAC solvent after the polymerization of spandex.

[0038] The circulating hot air containing about 1% volume percentage of gaseous DMAC solvent can be cooled to liquid state and recycled, so the circulating hot air flowing through the duct of dry spinning is passed through the duct air outlet 6, enters the total heat exchanger 3 through the second circulating air inlet 306, is cooled to 50 DEG C through the third heat exchanger 303, the second heat exchanger 302 and the first heat exchanger 301, enters the total cooler 7 through the second circulating air outlet 307, is cooled to 12 DEG C through the first cooler 701, the second cooler 702 and the third cooler 703, and returns to the circulating air blower 1.

[0039] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] The above embodiments and drawings do not limit the product form and style of the present application, and any appropriate changes or modifications made by those skilled in the art shall be considered as not departing from the scope of the present application.

Claims

1. An energy-saving heat exchanger device for the production of high-resilience polyurethane spandex, characterized in that, It includes a circulating fan, an air inlet duct, a return air duct, a main heat exchanger, a main cooler, a heater, a circulating air inlet, and a duct return air inlet; The circulating fan is connected to one side of the heat exchanger through the air inlet channel, the other side of the main heat exchanger is connected to one side of the heater, and the other side of the heater is connected to the circulating air inlet. The circulating fan is connected to one side of the main cooler through the return air duct, the other side of the main cooler is connected to one side of the main heat exchanger, and the other side of the main heat exchanger is connected to the return air inlet of the duct. The main heat exchanger is a three-section heat exchanger, including a first heat exchanger, a second heat exchanger, and a third heat exchanger; the first heat exchanger is located on the side near the air inlet duct, the first heat exchanger is connected to the second heat exchanger, the second heat exchanger is connected to the third heat exchanger, and the third heat exchanger is connected to the heater and the duct return air inlet.

2. The energy-saving heat exchanger device for the production of high-resilience polyurethane spandex as described in claim 1, characterized in that, The main cooler includes a first cooler, a second cooler, and a third cooler, and circulating water is provided in the first cooler, the second cooler, and the third cooler, with the circulating water temperature being 7°C.

3. The energy-saving heat exchanger device for the production of high-resilience polyurethane spandex as described in claim 1, characterized in that, The heater includes a heat transfer oil inlet and a heat transfer oil return outlet. The heat transfer oil inlet is located at the lower end of the heater, and the heat transfer oil return outlet is located at the top end of the heater.

4. The energy-saving heat exchanger device for the production of high-resilience polyurethane spandex as described in claim 1, characterized in that, The main heat exchanger further includes a first circulating air inlet, a first circulating air outlet, a second circulating air inlet, and a second circulating air outlet; the first circulating air inlet is located between the air inlet channel and the main heat exchanger, the first circulating air outlet is located between the main heat exchanger and the heater, the second circulating air inlet is located between the return air outlet of the duct and the main heat exchanger, and the second circulating air outlet is located between the heat exchanger and the main cooler.

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