PET polyester spinning system and application thereof

Abstract

The application discloses a PET polyester spinning system and application thereof, and relates to the technical field of polyester spinning systems, in particular to a PET polyester spinning system and application thereof. The system comprises a polyester subsystem and a spinning subsystem. The polyester subsystem comprises an ethylene glycol evaporator, an ethylene glycol conveying pipeline, a first melt conveying pipeline and an ethylene glycol evaporation heat medium circulating pump. The spinning subsystem comprises a second melt conveying pipeline, a melt booster pump, a melt cooler, a melt cooling heat medium circulating pump and a third melt conveying pipeline. One end of a circulating low-temperature secondary heat medium supply pipeline of a heat medium series pipeline is communicated with an ethylene glycol heat medium circulating pipeline, and the other end is communicated with a melt heat medium circulating pipeline. One end of a circulating low-temperature secondary heat medium return pipeline is communicated with the ethylene glycol heat medium circulating pipeline, and the other end is communicated with the melt heat medium circulating pipeline. By recycling waste heat in the PET polymer melt conveying process, the spinning production workshop environment is improved, the use amount of the primary heating heat medium of the ethylene glycol evaporation system is reduced, energy saving and consumption reduction are realized, and a green low-carbon environmental protection effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the polyester fiber technology field, in particular to a PET polyester spinning system and application thereof. BACKGROUND

[0002] The existing PET polymer melt direct spinning production process, in the PET polymer melt conveying process, because of the melt flow and the additional temperature rise generated by the booster pump, the heat of this part needs to be removed in time to ensure that the melt maintains a relatively reasonable conveying temperature, so as to avoid the influence of the temperature of the melt conveying process on the quality of the spinning product. The conventional technology usually adopts a melt cooler to reduce the temperature, and the cooling medium is a secondary circulating heat medium. The secondary circulating heat medium usually adopts finned tube to exchange heat with the environment air to achieve the purpose of temperature reduction and heat removal. The heat is dissipated to the environment, which not only increases the temperature of the workshop environment, but also wastes fuel. SUMMARY

[0003] In view of the above problems, the present application is proposed in order to provide a PET polyester spinning system and application thereof which overcomes the above problems or at least partially solves the above problems.

[0004] In a first aspect, the embodiments of the present application provide a PET polyester spinning system, which can include: a polyester subsystem and a spinning subsystem, the polyester subsystem and the spinning subsystem are connected through a heat medium serial connection pipeline;

[0005] The polyester subsystem includes: a glycol evaporator, a glycol conveying pipeline, a first melt conveying pipeline and a glycol evaporation heat medium circulating pump; the glycol conveying pipeline is connected with the bottom of the glycol evaporator through a glycol supply pipeline; the first melt conveying pipeline is connected with the top gas outlet of the glycol evaporator through a glycol vapor pipeline; the glycol evaporation heat medium circulating pump is connected with the inlet and outlet of the inner coil of the glycol evaporator through a glycol heat medium circulating pipeline respectively;

[0006] The spinning subsystem includes: a second melt conveying pipeline, a melt booster pump, a melt cooler, a melt cooling heat medium circulating pump and a third melt conveying pipeline; the second melt conveying pipeline, the melt booster pump, the melt cooler and the third melt conveying pipeline are connected in sequence through a melt conveying pipeline; the melt cooling heat medium circulating pump is connected with the inlet and outlet of the inner coil of the melt cooler through a melt heat medium circulating pipeline respectively;

[0007] The heat medium serial connection pipeline comprises: a circulating low-temperature secondary heat medium supply pipeline and a circulating low-temperature secondary heat medium return pipeline, one end of the circulating low-temperature secondary heat medium supply pipeline is communicated with the ethylene glycol heat medium circulation pipeline near the outlet of the ethylene glycol evaporating heat medium circulating pump, and the other end is communicated with the melt heat medium circulation pipeline near the inlet of the melt cooling heat medium circulating pump; one end of the circulating low-temperature secondary heat medium return pipeline is communicated with the ethylene glycol heat medium circulation pipeline near the outlet of the inner coil in the ethylene glycol evaporator, and the other end is communicated with the melt heat medium circulation pipeline near the outlet of the inner coil in the melt cooler.

[0008] Optionally, the polyester subsystem can further comprise: a first heat medium filling conveying pipeline, a first heat medium conveying pipeline and a heat medium recovery pipeline; the first heat medium filling conveying pipeline is communicated with the ethylene glycol heat medium circulation pipeline near the inlet of the ethylene glycol evaporating heat medium circulating pump; the first heat medium conveying pipeline is communicated with the ethylene glycol heat medium circulation pipeline near the outlet of the ethylene glycol evaporating heat medium circulating pump through the first temperature controller; and the heat medium recovery pipeline is communicated with the ethylene glycol heat medium circulation pipeline near the outlet of the inner coil in the ethylene glycol evaporator.

[0009] Optionally, a first valve is arranged between the first heat medium filling conveying pipeline and the ethylene glycol heat medium circulation pipeline;

[0010] A second valve is arranged between the first heat medium conveying pipeline and the first temperature controller, an inlet end of the second valve is communicated with the first heat medium conveying pipeline, one outlet end is communicated with the first temperature controller, and the other outlet end is communicated with the ethylene glycol heat medium circulation pipeline near the inlet of the ethylene glycol evaporating heat medium circulating pump;

[0011] A third valve is arranged on the ethylene glycol heat medium circulation pipeline between the ethylene glycol evaporating heat medium circulating pump and the ethylene glycol evaporator, an inlet end of the third valve is communicated with the outlet of the ethylene glycol evaporating heat medium circulating pump, one outlet end is communicated with the inlet of the inner coil in the ethylene glycol evaporator, and the other outlet end is closed; and / or,

[0012] The ethylene glycol heat medium circulation pipelines at both ends of the ethylene glycol evaporating heat medium circulating pump are connected in parallel and provided with a fourth valve.

[0013] Optionally, a fifth valve is arranged on the ethylene glycol supply pipeline;

[0014] The polyester subsystem can further comprise: a liquid level indicating controller, a sixth valve and a seventh valve; one end of the liquid level indicating controller is communicated with the bottom of the ethylene glycol evaporator through the sixth valve, and the other end is communicated with the top of the ethylene glycol evaporator through the seventh valve;

[0015] The fifth valve has an inlet end connected to the ethylene glycol delivery pipeline, one outlet end connected to the bottom of the ethylene glycol evaporator, and another outlet end connected to the liquid level indicator controller.

[0016] Optionally, the system can further comprise a second temperature controller connected to the ethylene glycol evaporator.

[0017] Optionally, the spinning subsystem can further comprise a second heat medium filling delivery pipeline and a second heat medium delivery pipeline; the second heat medium filling delivery pipeline is connected to the melt heat medium circulation pipeline near the outlet of the melt cooling heat medium circulation pump, and the second heat medium delivery pipeline is connected to the melt heat medium circulation pipeline near the inlet of the melt cooling heat medium circulation pump.

[0018] Optionally, an eighth valve is arranged between the second heat medium filling delivery pipeline and the melt heat medium circulation pipeline.

[0019] A ninth valve and a third temperature controller are arranged between the second heat medium delivery pipeline and the melt heat medium circulation pipeline; the inlet end of the ninth valve is connected to the second heat medium delivery pipeline, one outlet end of the ninth valve is connected to the third temperature controller and then connected to the melt heat medium circulation pipeline near the outlet of the melt cooling heat medium circulation pump, and the other outlet end is connected to the melt heat medium circulation pipeline near the inlet of the melt cooling heat medium circulation pump; and / or,

[0020] The melt heat medium circulation pipelines at the inlet and outlet of the melt cooling heat medium circulation pump are connected in parallel and provided with a tenth valve.

[0021] Optionally, the system can further comprise a circulating low-temperature secondary heat medium delivery pipeline and a circulating low-temperature secondary heat medium delivery pipeline.

[0022] The circulating low-temperature secondary heat medium delivery pipeline is connected to the circulating low-temperature secondary heat medium supply pipeline, and the circulating low-temperature secondary heat medium delivery pipeline is connected to the circulating low-temperature secondary heat medium return pipeline.

[0023] Optionally, the system can further comprise an eleventh valve arranged in parallel pipelines between the circulating low-temperature secondary heat medium supply pipeline and the circulating low-temperature secondary heat medium return pipeline.

[0024] Twelfth valve, thirteenth valve and fourteenth valve are sequentially arranged on the circulating low-temperature secondary heat medium supply pipeline; the twelfth valve and the thirteenth valve are located on both sides of the parallel pipeline, the fourteenth valve is close to the melt heat medium circulating pipeline, an inlet end of the fourteenth valve is communicated with the circulating low-temperature secondary heat medium supply pipeline, one outlet end close to the inlet of the melt cooling heat medium circulating pump is communicated with the melt heat medium circulating pipeline, and the other outlet end close to the outlet of the melt cooling heat medium circulating pump is communicated with the melt heat medium circulating pipeline;

[0025] and / or,

[0026] Fifteenth valve arranged on the circulating low-temperature secondary heat medium return pipeline.

[0027] In the second aspect, the application provides a PET polyester spinning system in the polyester spinning process.

[0028] The beneficial effects of the above technical solutions provided in the embodiments of the application at least include:

[0029] The application provides a PET polyester spinning system and application thereof, and the waste heat in the PET polymer melt conveying process is recycled, the spinning production workshop environment is improved, the use amount of the heat medium for primary heating of the ethylene glycol evaporation system is reduced, energy consumption is saved, and the green low-carbon environmental protection effect is achieved.

[0030] In the embodiments of the application, the heat generated due to the melt flow and the additional temperature rise of the booster pump in the polymer melt conveying process is recycled as a supplementary heat source for the ethylene glycol evaporation heat medium heating of the polyester workshop (polyester subsystem) through the circulating secondary heat medium (hydrogenated terphenyl) which exchanges heat with the PET melt through the melt cooler, and the heat is completely recycled in the ethylene glycol evaporation heating system instead of being cooled by the conventional finned tube and the ambient air. Specifically, a low-temperature heat medium dry pipe (circulating low-temperature secondary heat medium supply pipeline) is connected to the outlet of the ethylene glycol evaporation heat medium circulating pump as the cold source of the melt cooler, the secondary heat medium after heat exchange through the melt cooler returns to the inlet of the ethylene glycol evaporation heat medium circulating pump, a low-temperature secondary heat medium circulation system powered by the ethylene glycol evaporation heat medium circulating pump is established, the heat load of the melt cooler is taken out to supply the ethylene glycol evaporator heating system, and therefore the use amount of the primary heat medium of the ethylene glycol evaporator is saved.

[0031] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the written description and claims hereof.

[0032] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 This is a structural diagram of a PET polyester spinning system provided in an embodiment of the present invention;

[0035] Among them, 1-polyester subsystem; 2-spinning subsystem; 3-heat medium series pipe line;

[0036] 101-ethylene glycol evaporator; 102-ethylene glycol delivery pipeline; 103-first melt delivery pipeline; 104-ethylene glycol evaporation heat medium circulation pump; 105-ethylene glycol supply pipeline; 106-ethylene glycol vapor pipeline; 107-ethylene glycol heat medium circulation pipeline; 108-first heat medium filling and delivery pipeline; 109-first heat medium delivery pipeline; 110-heat medium recovery pipeline; 111-first temperature controller; 112-first valve; 113-second valve; 114-third valve; 115-fourth valve; 116-fifth valve; 117-liquid level indicator controller; 118-sixth valve; 119-seventh valve; 120-second temperature controller;

[0037] 201 - Second melt delivery pipeline; 202 - Melt booster pump; 203 - Melt cooler; 204 - Melt cooling heat medium circulation pump; 205 - Third melt delivery pipeline; 206 - Melt heat medium circulation pipeline; 207 - Second heat medium filling delivery pipeline; 208 - Second heat medium delivery pipeline; 209 - Eighth valve; 210 - Ninth valve; 211 - Third temperature controller; 212 - Tenth valve;

[0038] 31-circulating low-temperature secondary heat medium supply pipeline; 32-circulating low-temperature secondary heat medium return pipeline; 33-first circulating low-temperature secondary heat medium delivery pipeline; 34-second circulating low-temperature secondary heat medium delivery pipeline; 35-eleventh valve; 36-twelfth valve; 37-thirteenth valve; 38-fourteenth valve; 39-fifteenth valve. DETAILED DESCRIPTION

[0039] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0040] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "far", "near", "front", "back", 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 devices or elements 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 addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] The present application provides a PET polyester spinning system, as shown in the figure, which can include: a polyester subsystem 1 and a spinning subsystem 2, the polyester subsystem 1 and the spinning subsystem 2 are connected through a heat medium stringing pipeline 3; Figure 1 The polyester subsystem 1 can include: a glycol evaporator 101, a glycol conveying pipeline 102, a first melt conveying pipeline 103, and a glycol evaporation heat medium circulating pump 104; the glycol conveying pipeline 102 is communicated with the bottom of the glycol evaporator 101 through a glycol supply pipeline 105; the first melt conveying pipeline 103 is communicated with the top gas outlet of the glycol evaporator 101 through a glycol vapor pipeline 106; the glycol evaporation heat medium circulating pump 104 is respectively communicated with the inlet and outlet of the inner coil (not shown in the figure) in the glycol evaporator 101 through a glycol heat medium circulating pipeline 107;

[0043] The spinning subsystem 2 can include: a second melt conveying pipeline 201, a melt booster pump 202, a melt cooler 203, a melt cooling heat medium circulating pump 204, and a third melt conveying pipeline 205; the second melt conveying pipeline 201, the melt booster pump 202, the melt cooler 203, and the third melt conveying pipeline 205 are sequentially communicated through a melt conveying pipeline; the melt cooling heat medium circulating pump 204 is respectively communicated with the inlet and outlet of the inner coil (not shown in the figure) in the melt cooler 203 through a melt heat medium circulating pipeline 206;

[0044]

[0045] ​The heat medium serial connection pipeline 3 can comprise a circulating low-temperature secondary heat medium supply pipeline 31 and a circulating low-temperature secondary heat medium return pipeline 32, one end of the circulating low-temperature secondary heat medium supply pipeline 31 is communicated with the ethylene glycol heat medium circulation pipeline 107 near the outlet of the ethylene glycol evaporative heat medium circulation pump 104, and the other end is communicated with the melt heat medium circulation pipeline 206 near the inlet of the melt cooling heat medium circulation pump 204; one end of the circulating low-temperature secondary heat medium return pipeline 32 is communicated with the ethylene glycol heat medium circulation pipeline 107 near the outlet of the inner coil in the ethylene glycol evaporator 101, and the other end is communicated with the melt heat medium circulation pipeline 206 near the outlet of the inner coil in the melt cooler 203.

[0046] It should be noted that, as shown in Figure 1 It should be noted that, as shown in

[0047] The system provided in the embodiment of the present application recycles the waste heat in the PET polymer melt conveying process, improves the environment of the spinning production workshop, reduces the use amount of the heat medium for primary heating of the ethylene glycol evaporation system, realizes energy saving and consumption reduction, and achieves the effect of green low-carbon environmental protection.

[0048] The embodiment of the present application aims at the part of heat generated due to melt flow and additional temperature rise of the booster pump in the polymer melt conveying process, and the heat is completely recycled in the ethylene glycol evaporation heating system after the circulating secondary heat medium (hydrogenated terphenyl) exchanges heat with the PET melt through the melt cooler and serves as a supplementary heat source for ethylene glycol evaporation heat medium heating of the polyester workshop (polyester subsystem), instead of the conventional finned tube and environmental air heat exchange cooling measure. Specifically, a low-temperature heat medium dry pipe (circulating low-temperature secondary heat medium supply pipeline) is connected to the outlet of the ethylene glycol evaporation heat medium circulation pump as a cold source of the melt cooler, the secondary heat medium after heat exchange through the melt cooler returns to the inlet of the ethylene glycol evaporation heat medium circulation pump, a low-temperature secondary heat medium circulation system powered by the ethylene glycol evaporation heat medium circulation pump is established, the heat load of the melt cooler is taken out to supplement the ethylene glycol evaporator heating system, thereby saving the use amount of the primary heat medium of the ethylene glycol evaporator.

[0049] In an optional embodiment, as shown in Figure 1As shown in the figure, the polyester subsystem 1 can further comprise a first heat medium filling conveying pipeline 108, a first heat medium conveying pipeline 109 and a heat medium recovery pipeline 110; the first heat medium filling conveying pipeline 108 is communicated with the ethylene glycol heat medium circulating pipeline 107 near the inlet of the ethylene glycol evaporation heat medium circulating pump 104; the first heat medium conveying pipeline 109 is communicated with the ethylene glycol heat medium circulating pipeline 107 near the outlet of the ethylene glycol evaporation heat medium circulating pump 104 through the first temperature controller 111; and the heat medium recovery pipeline 110 is communicated with the ethylene glycol heat medium circulating pipeline 107 near the outlet of the inner coil of the ethylene glycol evaporator 101.

[0050] The first temperature controller in the embodiment of the present application controls the temperature of the circulating low-temperature secondary heat medium used for heat extraction from the melt cooler and the primary heat medium in the first heat medium conveying pipeline in stages, so that the circulating secondary heat medium temperature required for precision control according to the melt process parameters can be controlled. The circulating secondary heat medium carrying heat after heat exchange from the melt cooler returns to the inlet return pipeline of the ethylene glycol evaporation circulating heat medium system, as a supplementary heat source of the ethylene glycol evaporation heat medium, so that heat recovery and utilization is realized and the operating environment of the production workshop is improved.

[0051] In another optional embodiment, referring to Figure 1 As shown in the figure, the first heat medium filling conveying pipeline 108 and the ethylene glycol heat medium circulating pipeline 107 are further provided with a first valve 112, and the first valve in the embodiment of the present application can be a spherical valve;

[0052] The first heat medium conveying pipeline 109 and the first temperature controller 111 are provided with a second valve 113, and the second valve in the embodiment is a pneumatic valve, specifically a two-position three-way pneumatic valve; the inlet end of the second valve 113 is communicated with the first heat medium conveying pipeline 109, one outlet end is communicated with the first temperature controller 111, and the other outlet end is communicated with the ethylene glycol heat medium circulating pipeline 107 near the inlet of the ethylene glycol evaporation heat medium circulating pump 104;

[0053] The ethylene glycol heat medium circulating pipeline 107 between the ethylene glycol evaporation heat medium circulating pump 104 and the ethylene glycol evaporator 101 is provided with a third valve 114, and the third valve in the embodiment is a pneumatic valve; the inlet end of the third valve 114 is communicated with the outlet of the ethylene glycol evaporation heat medium circulating pump 104, one outlet end is communicated with the inlet of the inner coil of the ethylene glycol evaporator 101, and the other outlet end is closed; and / or,

[0054] The ethylene glycol heat medium circulating pipeline 107 at both ends of the inlet and outlet of the ethylene glycol evaporation heat medium circulating pump 104 is connected in parallel and provided with a fourth valve 115.

[0055] The arrow marked on the valve body of the fourth valve 115 in this embodiment is the recommended pressure bearing direction of the valve. The pressure bearing direction refers to the arrow direction of the valve body in the closed state after the valve is applied to the pipeline working condition. If the valve is installed incorrectly, the leakage failure phenomenon of the valve not being tightly closed may occur.

[0056] In another optional embodiment, referring to Figure 1 Fig. 5, the fifth valve 116 is arranged on the ethylene glycol supply pipeline 105. The fifth valve in this embodiment is a pneumatic valve.

[0057] The polyester subsystem 1 can further include a liquid level indicating controller 117, a sixth valve 118, and a seventh valve 119. One end of the liquid level indicating controller 117 is in communication with the bottom of the ethylene glycol evaporator 101 through the sixth valve 118, and the other end is in communication with the top of the ethylene glycol evaporator 101 through the seventh valve 119.

[0058] The inlet end of the fifth valve 116 is in communication with the ethylene glycol delivery pipeline 102, one outlet end is in communication with the bottom of the ethylene glycol evaporator 101, and the other outlet end is in communication with the liquid level indicating controller 117.

[0059] The sixth valve and the seventh valve in this embodiment are ball valves, which can effectively open and close the pipeline.

[0060] In another optional embodiment, referring to Figure 1 Fig. 6, the system can further include a second temperature controller 120 in communication with the ethylene glycol evaporator 101.

[0061] In another optional embodiment, referring to Figure 1 Fig. 7, the spinning subsystem 2 can further include a second heat medium filling delivery pipeline 207 and a second heat medium delivery pipeline 208. The second heat medium filling delivery pipeline 207 is in communication with the melt heat medium circulation pipeline 206 near the outlet of the melt cooling heat medium circulation pump 204, and the second heat medium delivery pipeline 208 is in communication with the melt heat medium circulation pipeline 206 near the inlet of the melt cooling heat medium circulation pump 204.

[0062] In another optional embodiment, referring to Figure 1 Fig. 8, an eighth valve 209 is arranged between the second heat medium filling delivery pipeline 207 and the melt heat medium circulation pipeline 206. The eighth valve in this embodiment is a ball valve.

[0063] The ninth valve 210 is a two-position three-way pneumatic valve, the inlet end of the ninth valve 210 is communicated with the second heat medium conveying pipeline 208, one outlet end of the ninth valve 210 is communicated with the melt heat medium circulating pipeline 206 close to the outlet of the melt cooling heat medium circulating pump 204 after being connected with the third temperature controller 211, and the other outlet end is communicated with the melt heat medium circulating pipeline 206 close to the inlet of the melt cooling heat medium circulating pump 204; and / or,

[0064] The melt heat medium circulating pipeline 206 at both ends of the inlet and outlet of the melt cooling heat medium circulating pump 204 is connected in parallel and provided with the tenth valve 212.

[0065] The arrow marked on the valve body of the tenth valve in the embodiment is the recommended pressure bearing direction of the valve, the pressure bearing direction refers to the direction of the arrow of the valve body in the closed state of the valve after being applied to the pipeline working condition, and the direction is the recommended pressure bearing direction. If the valve is installed incorrectly, a leakage failure phenomenon of the valve not being tightly closed may occur.

[0066] In another optional embodiment, referring to FIG. 3, the system can further include a first circulating low-temperature secondary heat medium conveying pipeline 33 and a second circulating low-temperature secondary heat medium conveying pipeline 34. Figure 1

[0067] The first circulating low-temperature secondary heat medium conveying pipeline 33 is communicated with the circulating low-temperature secondary heat medium supply pipeline 31, and the second circulating low-temperature secondary heat medium conveying pipeline 34 is communicated with the circulating low-temperature secondary heat medium return pipeline 32.

[0068] In another optional embodiment, referring to FIG. 3, the system can further include a first circulating low-temperature secondary heat medium conveying pipeline 33 and a second circulating low-temperature secondary heat medium conveying pipeline 34. Figure 1

[0069] The twelfth valve 36, the thirteenth valve 37 and the fourteenth valve 38 are sequentially arranged on the circulating low-temperature secondary heat medium supply pipeline 31; the twelfth valve 36 and the thirteenth valve 37 are located on both sides of the parallel pipeline, the fourteenth valve 38 is close to the melt heat medium circulating pipeline 206, the inlet end of the fourteenth valve 38 is communicated with the circulating low-temperature secondary heat medium supply pipeline 31, one outlet end is communicated with the melt heat medium circulating pipeline 206 close to the inlet of the melt cooling heat medium circulating pump 204, and the other outlet end is communicated with the melt heat medium circulating pipeline 206 close to the outlet of the melt cooling heat medium circulating pump 204;

[0070] The twelfth valve 36, the thirteenth valve 37 and the fourteenth valve 38 are sequentially arranged on the circulating low-temperature secondary heat medium supply pipeline 31; the twelfth valve 36 and the thirteenth valve 37 are located on both sides of the parallel pipeline, the fourteenth valve 38 is close to the melt heat medium circulating pipeline 206, the fourteenth valve 38 is communicated with the circulating low-temperature secondary heat medium supply pipeline 31, one outlet end is communicated with the melt heat medium circulating pipeline 206 close to the inlet of the melt cooling heat medium circulating pump 204, and the other outlet end is communicated with the melt heat medium circulating pipeline 206 close to the outlet of the melt cooling heat medium circulating pump 204;

[0071] ​​A fifteenth valve 39 is arranged on the circulating low-temperature secondary heat medium return pipeline 32.

[0072] The twelfth valve and the thirteenth valve in the embodiment are ball valves, the fourteenth valve is a two-position three-way pneumatic valve, and the fifteenth valve is a ball valve.

[0073] The PET polyester spinning system provided in the embodiment of the application has a wide application prospect, and can save nearly 1 million yuan of energy running cost per year for a 300,000-ton / year polyester spinning production device. The finned tube for heat dissipation to the ambient air in the production workshop is cancelled, and the environment temperature in the workshop is improved. Further, the waste heat in the PET melt conveying process is recycled, which has a positive effect on the transformation of the environment and energy saving and consumption reduction of the enterprise, and thus can be widely applied in polyester chemical fiber and synthetic material enterprises.

[0074] In one specific example, an enterprise project with an annual output of 600,000 tons of intelligent and low-carbon differentiated fibers is taken as an example for illustration. The project has been put into use and has a good running effect.

[0075] 1. Energy saving and consumption reduction: five conveying lines have been put into use. Considering the energy consumption of the ethylene glycol heat medium pump, the energy (238 kW-35 kW) recycled per year is estimated to be 99.06 million yuan per year, and nearly 1 million yuan of running cost can be saved per year. If the frequency control is used for the ethylene glycol heat medium pump of the subsequent device, and the pump parameters are further optimized, the energy saving effect will be better.

[0076] 1) 238 kW is the heat load required to be taken out of the four melt coolers (according to the Sulzer data table, and the coefficient is converted according to the actual device).

[0077] 2) 35 kW is the energy consumption of the polyester ethylene glycol evaporation heat medium circulating pump.

[0078] 2. Investment: 6 sets of finned tube air coolers can be reduced for each melt conveying line, 6*0.55*5=16.5 (ten thousand yuan); considering the increase of the circulating low-temperature secondary heat medium regulating valve group and the circulating low-temperature secondary heat medium carbon steel pipeline in the spinning and polyester workshops, it is estimated that 2.5*5=12.5 (ten thousand yuan); 16.5-12.5=4 (ten thousand yuan). The overall investment will be slightly reduced by applying the energy saving and recycling technology.

[0079] 3. Workshop environment temperature: after not using or cancelling the finned tube air cooler, the on-site detection shows that the environment temperature in the workshop is slightly lower by 1~2℃, and the temperature at the finned tube air cooler accessory pipe rack or wall is slightly lower by 4~5℃ or more.

[0080] Based on the same inventive concept, the application further provides an application of the PET polyester spinning system in a polyester spinning process.

[0081] The application of the PET polyester spinning system in the polyester spinning process has the beneficial effects and specific descriptions as mentioned above, and the application will not be described here again.

[0082] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. The present disclosure is not limited to the precise construction that has been described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is only limited by the appended claims. Thus, the present application is also intended to include such modifications and changes as fall within the scope of the claims of the present application and their equivalents.

Claims

1. A PET polyester spinning system characterized by, The application relates to a polyester spinning system. The polyester subsystem and the spinning subsystem are connected through a heat medium serial pipeline. The polyester subsystem comprises an ethylene glycol evaporator, an ethylene glycol conveying pipeline, a first melt conveying pipeline, an ethylene glycol evaporation heat medium circulating pump, a first heat medium filling conveying pipeline, a first heat medium conveying pipeline and a heat medium recovery pipeline; the ethylene glycol conveying pipeline is communicated with the bottom of the ethylene glycol evaporator through an ethylene glycol feeding pipeline; the first melt conveying pipeline is communicated with the top gas outlet of the ethylene glycol evaporator through an ethylene glycol vapor pipeline; the ethylene glycol evaporation heat medium circulating pump is respectively communicated with the inlet and outlet of the inner coil of the ethylene glycol evaporator through an ethylene glycol heat medium circulating pipeline; the first heat medium filling conveying pipeline is communicated with the ethylene glycol heat medium circulating pipeline near the inlet of the ethylene glycol evaporation heat medium circulating pump; the first heat medium conveying pipeline is communicated with the ethylene glycol heat medium circulating pipeline near the outlet of the ethylene glycol evaporation heat medium circulating pump through a first temperature controller; and the heat medium recovery pipeline is communicated with the ethylene glycol heat medium circulating pipeline near the outlet of the inner coil of the ethylene glycol evaporator. The spinning subsystem comprises a second melt conveying pipeline, a melt booster pump, a melt cooler, a melt cooling heat medium circulating pump and a third melt conveying pipeline; the second melt conveying pipeline, the melt booster pump, the melt cooler and the third melt conveying pipeline are sequentially communicated through a melt conveying pipeline; and the melt cooling heat medium circulating pump is respectively communicated with the inlet and outlet of the inner coil of the melt cooler through a melt heat medium circulating pipeline. The heat medium serial pipeline comprises a circulating low-temperature secondary heat medium feeding pipeline and a circulating low-temperature secondary heat medium returning pipeline; one end of the circulating low-temperature secondary heat medium feeding pipeline is communicated with the ethylene glycol heat medium circulating pipeline near the outlet of the ethylene glycol evaporation heat medium circulating pump, and the other end is communicated with the melt heat medium circulating pipeline near the inlet of the melt cooling heat medium circulating pump; one end of the circulating low-temperature secondary heat medium returning pipeline is communicated with the ethylene glycol heat medium circulating pipeline near the outlet of the inner coil of the ethylene glycol evaporator, and the other end is communicated with the melt heat medium circulating pipeline near the outlet of the inner coil of the melt cooler.

2. The system of claim 1, wherein, A first valve is arranged between the first heat medium filling conveying pipeline and the ethylene glycol heat medium circulating pipeline. A second valve is arranged between the first heat medium conveying pipeline and the first temperature controller; the inlet end of the second valve is communicated with the first heat medium conveying pipeline, one outlet end is communicated with the first temperature controller, and the other outlet end is communicated with the ethylene glycol heat medium circulating pipeline near the inlet of the ethylene glycol evaporation heat medium circulating pump. A third valve is arranged on the ethylene glycol heat medium circulating pipeline between the ethylene glycol evaporation heat medium circulating pump and the ethylene glycol evaporator; the inlet end of the third valve is communicated with the outlet of the ethylene glycol evaporation heat medium circulating pump, one outlet end is communicated with the inlet of the inner coil of the ethylene glycol evaporator, and the other outlet end is closed; and / or The ethylene glycol heat medium circulating pipelines at the inlet and outlet of the ethylene glycol evaporation heat medium circulating pump are connected in parallel and provided with a fourth valve.

3. The system of claim 1, wherein, The fifth valve is arranged on the ethylene glycol supply pipeline; The polyester subsystem further comprises a liquid level indicating controller, a sixth valve and a seventh valve; one end of the liquid level indicating controller is communicated with the bottom of the ethylene glycol evaporator through the sixth valve, and the other end is communicated with the top of the ethylene glycol evaporator through the seventh valve; The fifth valve has an inlet end communicated with the ethylene glycol conveying pipeline, one outlet end communicated with the bottom of the ethylene glycol evaporator, and the other outlet end communicated with the liquid level indicating controller.

4. The system of claim 1, wherein, Further comprising: A second temperature controller communicated with the ethylene glycol evaporator.

5. The system of claim 1, wherein, The spinning subsystem further comprises a second heat medium filling conveying pipeline and a second heat medium conveying pipeline; the second heat medium filling conveying pipeline is communicated with the melt heat medium circulating pipeline near the outlet of the melt cooling heat medium circulating pump, and the second heat medium conveying pipeline is communicated with the melt heat medium circulating pipeline near the inlet of the melt cooling heat medium circulating pump.

6. The system of claim 5, wherein, An eighth valve is further arranged between the second heat medium filling conveying pipeline and the melt heat medium circulating pipeline; A ninth valve and a third temperature controller are further arranged between the second heat medium conveying pipeline and the melt heat medium circulating pipeline; the inlet end of the ninth valve is communicated with the second heat medium conveying pipeline, one outlet end of the ninth valve is connected with the third temperature controller and then communicated with the melt heat medium circulating pipeline near the outlet of the melt cooling heat medium circulating pump, and the other outlet end is communicated with the melt heat medium circulating pipeline near the inlet of the melt cooling heat medium circulating pump; and / or, The melt heat medium circulating pipelines at both ends of the inlet and outlet of the melt cooling heat medium circulating pump are connected in parallel and provided with a tenth valve.

7. The system of any one of claims 1-6, wherein, Further comprising: A first circulating low-temperature secondary heat medium conveying pipeline and a second circulating low-temperature secondary heat medium conveying pipeline; The first circulating low-temperature secondary heat medium conveying pipeline is communicated with the circulating low-temperature secondary heat medium supply pipeline, and the second circulating low-temperature secondary heat medium conveying pipeline is communicated with the circulating low-temperature secondary heat medium return pipeline.

8. The system of claim 7, wherein, Further comprising: An eleventh valve arranged in the parallel pipeline between the circulating low-temperature secondary heat medium supply pipeline and the circulating low-temperature secondary heat medium return pipeline; A twelfth valve, a thirteenth valve and a fourteenth valve are arranged on the circulating low-temperature secondary heat medium supply pipeline in sequence; the twelfth valve and the thirteenth valve are located on both sides of the parallel pipeline, the fourteenth valve is near the melt heat medium circulating pipeline, the inlet end of the fourteenth valve is communicated with the circulating low-temperature secondary heat medium supply pipeline, one outlet end is communicated with the melt heat medium circulating pipeline near the inlet of the melt cooling heat medium circulating pump, and the other outlet end is communicated with the melt heat medium circulating pipeline near the outlet of the melt cooling heat medium circulating pump; And / or, A fifteenth valve arranged on the circulating low-temperature secondary heat medium return pipeline.

9. Application of the PET polyester spinning system according to any one of claims 1-8 in a polyester spinning process.

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