Online waste heat drying auxiliary heating circulation system

Abstract

The invention provides an online waste heat drying auxiliary heating circulation system, and relates to the technical field of waste heat utilization. Comprising a heat absorption pipe, a heat exchange shell, a plurality of heat exchange pipes, an air inlet shell, an air outlet shell, a fourth pipeline, a heat exchange fluid storage box, a first conveying pump, a fifth pipeline, a backflow pipe, a second conveying pump, a sixth pipeline, a first pipeline, an air outlet end of an air supply device, a second pipeline, a third pipeline, an exhaust device, a seventh pipeline and a drying box. The control device is electrically connected with the air supply device and the air exhaust device; waste heat of the pultrusion die heats heat exchange fluid in a heat absorption pipe, the heated heat exchange fluid enters a heat exchange shell through a fifth pipeline, and air enters the heat exchange pipe through an air supply device, a first pipeline and an air inlet shell. The heated heat exchange fluid heats air in the heat exchange pipes in the heat exchange shell, and the heated air enters the air outlet shell and then is input into the drying box to dry the coated profile. Waste heat recycling of the pultrusion die is achieved, and more energy is saved.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat utilization, and in particular to an online waste heat drying auxiliary heating circulation system. Background Art

[0002] The composite material pultrusion process is a process method for producing composite material profiles by impregnating continuous fibers or their fabrics with resin under the traction of a traction device and heating the resin through a forming die (pultrusion die) to solidify the resin. In the prior art, the subsequent process of the cured profile usually includes coating, such as the coating method of polyurethane pultrusion composite material in CN 106903910B, and the coating usually requires heating the coated profile through a drying box; in the prior art, the waste heat of the pultrusion die is not utilized, and the profile after coating in the drying box needs to be heated by an additional heat source, resulting in a waste of heat energy of the pultrusion die. Summary of the invention

[0003] The present invention provides an online waste heat drying auxiliary heating circulation system to solve the technical problems raised by the above background technology.

[0004] In order to solve the above technical problems, the present invention discloses an online waste heat drying auxiliary heating circulation system, comprising:

[0005] A heat absorbing tube, which is arranged in the pultrusion die or wound on the pultrusion die;

[0006] A heat exchange shell, a pultrusion die is connected to the upper end of the heat exchange shell through a first bracket, an air inlet shell and an air outlet shell are respectively arranged on both sides of the heat exchange shell, a plurality of heat exchange tubes are arranged horizontally at intervals in the heat exchange shell, two ends of the heat exchange tubes are respectively connected to the air inlet shell and the air outlet shell, one end of the heat absorption tube is connected to the fourth pipeline, the fourth pipeline is connected to the heat exchange fluid storage tank, the other end of the heat absorption tube is connected to the inlet end of the first delivery pump, the outlet end of the first delivery pump is connected to the heat exchange fluid inlet of the heat exchange shell through the fifth pipeline, the heat exchange fluid outlet of the heat exchange shell is connected to the return pipe, the return pipe is connected to the inlet end of the second delivery pump, and the outlet end of the second delivery pump is connected to the heat exchange fluid storage tank through the sixth pipeline;

[0007] A first pipeline, one end of which is connected to the gas outlet of the gas supply device, and the other end of which is connected to the gas inlet shell;

[0008] a second pipeline and a third pipeline, wherein the first end of the second pipeline is connected to the gas outlet shell, the second end of the second pipeline is connected to the first end of the third pipeline, the second end of the third pipeline is connected to the air inlet end of the exhaust device, and the air outlet end of the exhaust device is connected to the drying box through the seventh pipeline;

[0009] The control device is electrically connected to the air supply device and the exhaust device respectively.

[0010] Preferably, the second end of the second pipeline is directly connected to the first end of the third pipeline or is connected to the first end of the third pipeline through a gas heating device.

[0011] Preferably, the heat exchange fluid is heat exchange oil or water.

[0012] Preferably, the air supply device is a first fan or a first air pump, and the exhaust device is a second fan or a second air pump.

[0013] Preferably, it also includes:

[0014] A first region division module is used to obtain a pultrusion die model, and divide the pultrusion die model into a plurality of first regions at even intervals along the length direction and number the first regions, and a plurality of first temperature sensors are evenly spaced in each first region;

[0015] A first acquisition module is used to obtain a detection value of a first temperature sensor within a first preset time period when the pultrusion die needs to start waste heat recovery in the current working mode of the pultrusion die;

[0016] A first calculation module, used for calculating a first temperature value of each first area based on a detection value of the first temperature sensor;

[0017] The second area division module is used to divide the pultrusion die model into a plurality of second areas along the length direction and number them, wherein the second area is composed of a plurality of first areas with consecutive numbers, and the absolute value of the difference between the first temperature values ​​of any two first areas of the same second area is less than the first preset value; a heat absorption tube is wound around each second area, and the heat exchange fluid inlet of each heat absorption tube is connected to the first main delivery pipe through a first connecting branch pipe, the first main delivery pipe is connected to the fourth pipeline, and the heat exchange fluid outlet of each heat absorption tube is connected to the second main delivery pipe through a second connecting branch pipe, the heat exchange fluid outlet of the second main delivery pipe is connected to the inlet end of the first delivery pump, and each first connecting branch pipe is connected to a control valve.

[0018] 6. The online waste heat drying auxiliary heating circulation system according to claim 5, characterized in that: the first calculation module calculates the first temperature value of each first area based on the following formula;

[0019]

[0020] T i1 is the first temperature value of the i-th first region; M i is the total number of first temperature sensors in the i-th first area; T ij1 is the average detection value of the jth first temperature sensor in the i-th first area acquired by the first acquisition module; T ij2 is the maximum detection value of the jth first temperature sensor in the i-th first area acquired by the first acquisition module; Tij3 is the minimum detection value of the jth first temperature sensor in the i-th first area acquired by the first acquisition module; t ij T ij2 and T ij3 The corresponding time interval; lg is the logarithm with base 10; ln is the natural logarithm, e is the natural constant; n i1 is T of the first region i ij1 Greater than The total number of first temperature sensors; n i2 is T of the first region i ij1 Less than The total number of first temperature sensors; for The corresponding temperature correction coefficient is: 0 for Corresponding benchmark value / theoretical value.

[0021] Preferably, it also includes:

[0022] A second temperature sensor is used to detect the temperature of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell;

[0023] A first flow rate sensor is used to detect the flow rate of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell;

[0024] Environmental detection module, used for real-time detection of environmental parameters, including: ambient temperature and ambient humidity;

[0025] A first curve building module is used to periodically build a curve of the change of the temperature of the heat exchange fluid at the heat exchange fluid inlet as the first delivery pump works for a second preset time at a first power corresponding to each working mode in each working mode of the pultrusion die;

[0026] A second curve building module is used to periodically build a curve of the change of the flow rate of the heat exchange fluid at the heat exchange fluid inlet as the working time of the first delivery pump changes under each working mode of the pultrusion die and the first delivery pump works at the first power corresponding to each working mode for a second preset time;

[0027] The first detection module is used to periodically obtain the ratio of the heat added by the air in the heat exchange tube to the heat dissipation of the heat exchange fluid in the heat exchange shell;

[0028] A first storage module, used for storing the detection value of the second temperature sensor, the detection value of the environment detection module, the curve constructed by the first curve construction module and the curve constructed by the second curve construction module based on the timestamp;

[0029] A first division module is used to divide the curve of the change of the heat exchange fluid temperature at the heat exchange fluid inlet as the first delivery pump works for a period of time into a plurality of first curve segments and number them, the difference between the maximum value and the minimum value of the ordinate of each first curve segment is less than or equal to the first difference, and the abscissa of each first curve segment is continuous in time;

[0030] A second division module is used to divide the curve of the change of the flow rate of the heat exchange fluid at the heat exchange fluid inlet as the working time of the first delivery pump into a plurality of second curve segments and number them, the difference between the maximum value and the minimum value of the ordinate of each second curve segment is less than or equal to the second difference, and the abscissa of each second curve segment is continuous in time;

[0031] The second calculation module is used to calculate the target wind speed in the heat exchange tube at the current moment based on the detection value of the environmental detection module at the current moment and the first curve segment corresponding to the current working mode at the current moment that was most recently obtained, and the second curve segment corresponding to the current working mode at the current moment that was most recently obtained. The control device controls the air supply device to work so that the actual wind speed at the inlet of the heat exchange tube is the target wind speed.

[0032] Preferably, the second calculation module calculates based on the following formula:

[0033]

[0034] v 2 is the target wind speed; T 1 is the average ordinate of the first curve segment corresponding to the current working mode at the current moment acquired most recently; K 1 is the average slope of the first curve segment corresponding to the current working mode at the current moment acquired most recently; ε 1 is the first temperature adjustment coefficient; ln is the natural logarithm, e is the natural constant; T 2 is the target temperature of the heat exchange fluid outlet of the heat exchange shell; c 1 is the constant pressure specific heat capacity of the heat transfer fluid; v 1 is the average flow velocity of the second curve segment corresponding to the current moment; ρ 1 is the density of the heat transfer fluid; A i A is the actual detection value of the i-th environmental parameter affecting the temperature of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell detected by the current environmental detection module; i0 is the detected value of the i-th environmental parameter affecting the temperature of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell when the variation curve of the temperature of the heat exchange fluid at the heat exchange fluid inlet of the current working mode with the working time of the first delivery pump is constructed most recently; for The corresponding second temperature adjustment coefficient; M is the total number of environmental parameters affecting the temperature of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell detected by the environmental detection module; ω is the ratio of the heat increase of the air in the heat exchange tube to the heat dissipation of the heat exchange fluid in the heat exchange shell obtained most recently; c 2 is the constant pressure specific heat capacity of the current ambient air; ρ 2 is the density of ambient air at the current moment; T 4 is the ambient air temperature at the current moment; T 3 is the target air temperature at the heat exchange tube outlet; K 2 is the average slope of the second curve segment corresponding to the current working mode at the current moment acquired most recently; ε 2 is the first flow rate adjustment coefficient; ε 3 is the third temperature adjustment coefficient.

[0035] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] When it is necessary to recover the waste heat of the pultrusion die, the first delivery pump is controlled by the control device to operate, and the heat exchange fluid in the heat exchange fluid storage box is sucked into the heat absorption tube through the fourth pipeline, and the waste heat of the pultrusion die is absorbed by the heat absorption tube. The waste heat of the pultrusion die heats the heat exchange fluid in the heat absorption tube, and the heated heat exchange fluid enters the heat exchange shell through the fifth pipeline, and the air enters the heat exchange tube through the air supply device, the first pipeline, and the air inlet shell; the heated heat exchange fluid heats the air in the heat exchange tube in the heat exchange shell, and the heated air enters the air outlet shell and is input into the drying box through the second pipeline, the third pipeline, the exhaust device, and the seventh pipeline to dry the painted profile; the present invention realizes the waste heat recovery of the pultrusion die and is more energy-saving.

[0038] The present invention solves the following problems raised by the background art: In the prior art, the waste heat of the pultrusion die is not utilized, and an additional heat source is required to heat the profile after coating in the drying oven, resulting in a waste of heat energy of the pultrusion die. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] 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:

[0040] Figure 1 It is a structural schematic diagram of the present invention;

[0041] Figure 2 It is a schematic structural diagram of an embodiment of a heat exchange shell of the present invention.

[0042] In the figure: 1. heat absorbing pipe; 2. first bracket; 3. heat exchange shell; 4. air inlet shell; 5. air outlet shell; 6. first pipeline; 7. second pipeline; 8. third pipeline; 9. air supply device; 10. exhaust device; 11. heat exchange fluid storage box; 12. return pipe; 13. fourth pipeline; 14. drying box; 15. second delivery pump; 16. heat exchange pipe; 17. first delivery pump; 18. pultrusion die; 19. fifth pipeline; 20. sixth pipeline; 21. seventh pipeline. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0044] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] The present invention provides the following embodiments

[0046] Embodiment 1, the present invention provides an online waste heat drying auxiliary heating circulation system, such as Figure 1-Figure 2 As shown, including:

[0047] A heat absorbing tube 1, wherein the heat absorbing tube 1 is arranged in the pultrusion die 18 or is wound on the pultrusion die 18;

[0048] The heat exchange shell 3 and the pultrusion die 18 are connected to the upper end of the heat exchange shell 3 through the first bracket 2. The air inlet shell 4 and the air outlet shell 5 are respectively arranged on both sides of the heat exchange shell 3. A plurality of heat exchange tubes 16 are arranged horizontally at intervals in the heat exchange shell 3. The two ends of the heat exchange tubes 16 are respectively connected to the air inlet shell 4 and the air outlet shell 5. One end of the heat absorption tube 1 is connected to the fourth pipeline 13, and the fourth pipeline 13 is connected to the heat exchange fluid storage tank 11. The other end of the heat absorption tube 1 is connected to the inlet end of the first delivery pump 17. The outlet end of the first delivery pump 17 is connected to the heat exchange fluid inlet of the heat exchange shell 3 through the fifth pipeline 19. The heat exchange fluid outlet of the heat exchange shell 3 is connected to the return pipe 12, and the return pipe 12 is connected to the inlet end of the second delivery pump 15. The outlet end of the second delivery pump 15 is connected to the heat exchange fluid storage tank 11 through the sixth pipeline 20. In the present invention, the first delivery pump 17 can also be connected between the outlet end of the fourth pipeline 13 and the heat absorption tube 1;

[0049] A first pipeline 6, one end of which is connected to the gas outlet end of the gas supply device 9, and the other end of which is connected to the gas inlet shell 4;

[0050] The second pipe 7 and the third pipe 8, the first end of the second pipe 7 is connected to the gas outlet housing 5, the second end of the second pipe 7 is connected to the first end of the third pipe 8, the second end of the third pipe 8 is connected to the air inlet end of the exhaust device 10, and the air outlet end of the exhaust device 10 is connected to the drying box 14 through the seventh pipe 21;

[0051] The control device is electrically connected to the air supply device 9 and the exhaust device 10 respectively.

[0052] Preferably, the second end of the second pipe 7 is directly connected to the first end of the third pipe 8 or is connected to the first end of the third pipe 8 through a gas heating device; when the air temperature in the second pipe 7 is greater than or equal to the preset drying temperature after the profile is painted, the gas heating device does not need to be connected; when the air temperature in the second pipe 7 is lower than the preset drying temperature after the profile is painted, the gas heating device needs to be connected;

[0053] The heat exchange fluid is heat exchange oil or water.

[0054] Preferably, the air supply device 9 is a first fan or a first air pump, and the exhaust device 10 is a second fan or a second air pump.

[0055] Preferably, an air filter is provided at the air inlet of the air supply device 9;

[0056] The working principle and beneficial effects of the above technical solution are:

[0057] When it is necessary to recover the waste heat of the pultrusion die 18, the first delivery pump 17 is controlled by the control device to work, and the heat exchange fluid in the heat exchange fluid storage box 11 is sucked into the heat absorption tube 1 through the fourth pipeline 13, and the waste heat of the pultrusion die 18 is absorbed by the heat absorption tube 1. The waste heat of the pultrusion die 18 heats the heat exchange fluid in the heat absorption tube 1, and the heated heat exchange fluid enters the heat exchange shell 3 through the fifth pipeline 19, and the air enters the heat exchange tube 16 through the air supply device 9, the first pipeline 6, and the air intake shell 4; the heated heat exchange fluid heats the air in the heat exchange tube 16 in the heat exchange shell 3, and the heated air enters the air outlet shell 5 and is input into the drying box 14 through the second pipeline 7, the third pipeline 8, the exhaust device 10, and the seventh pipeline 21 to dry the painted profile; the present invention realizes the waste heat recovery of the pultrusion die 18, which is more energy-saving.

[0058] The present invention solves the following problems raised by the background art: In the prior art, the waste heat of the pultrusion die is not utilized, and an additional heat source is required to heat the profile after coating in the drying oven, resulting in a waste of heat energy of the pultrusion die.

[0059] Embodiment 2, based on embodiment 1, further comprises:

[0060] A first region division module is used to obtain a model of the pultrusion die 18, and divide the pultrusion die 18 model into a plurality of first regions at even intervals along the length direction and number the first regions, and a plurality of first temperature sensors are evenly spaced in each first region;

[0061] A first acquisition module is used to obtain a first temperature sensor detection value within a first preset time period when the pultrusion die 18 needs to start waste heat recovery in the current working mode of the pultrusion die 18;

[0062] A first calculation module, used for calculating a first temperature value of each first area based on a detection value of the first temperature sensor;

[0063] The second area division module is used to divide the pultrusion die 18 model into a plurality of second areas along the length direction and number them, wherein the second area is composed of a plurality of first areas with consecutive numbers, and the absolute value of the difference between the first temperature values ​​of any two first areas of the same second area is less than the first preset value; each second area is wrapped with a heat absorption tube 1, and the heat exchange fluid inlet of each heat absorption tube 1 is connected to the first main delivery pipe through a first connecting branch pipe, and the first main delivery pipe is connected to the fourth pipeline 13, and the heat exchange fluid outlet of each heat absorption tube 1 is connected to the second main delivery pipe through a second connecting branch pipe, and the heat exchange fluid outlet of the second main delivery pipe is connected to the inlet end of the first delivery pump 17, and each first connecting branch pipe is connected to a control valve.

[0064] The first calculation module calculates the first temperature value of each first area based on the following formula;

[0065]

[0066] T i1 is the first temperature value of the i-th first region; M i is the total number of first temperature sensors in the i-th first area; T ij1 is the average detection value of the jth first temperature sensor in the i-th first area acquired by the first acquisition module; T ij2 is the maximum detection value of the jth first temperature sensor in the i-th first area acquired by the first acquisition module; T ij3 is the minimum detection value of the jth first temperature sensor in the i-th first area acquired by the first acquisition module; t ij T ij2 and T ij3 The corresponding time interval; lg is the logarithm with base 10; ln is the natural logarithm, e is the natural constant; n i1 is T of the first region i ij1 Greater than The total number of first temperature sensors; n i2 is T of the first region i ij1 Less than The total number of first temperature sensors; for The corresponding temperature correction factor (can be based on the preset - Temperature coefficient mapping table, or based on the following formula );∝ 0 for Corresponding benchmark value / theoretical value.

[0067] The beneficial effects of the above technical solution are:

[0068] Due to the differences in the pultrusion die itself, working mode, and working environment, the temperature distribution state on the surface of the pultrusion die may be different. It is necessary to design the arrangement of the heat absorption tube 1 and the heat absorption tube 1 (controlled by the control valve) according to the specific working environment and working mode of the specific pultrusion die;

[0069] The pultrusion die 18 is partitioned once through the first area division module to obtain the first area, and then the current working mode of each first area and the actual first temperature value (temperature state) of each first area under the current working environment are obtained according to the first temperature sensor detection value within the first preset time when the waste heat recovery of the pultrusion die 18 is started; then the current pultrusion die 18 is secondary partitioned to obtain the second area according to the current working mode of each first area and the actual first temperature value (temperature state) of each first area under the current working environment, so as to ensure that the temperature of each second area is more uniform (the second area is composed of a number of first areas with consecutive numbers, and the absolute value of the difference between the first temperature values ​​of any two first areas of the same second area is less than the first preset value), and corresponding heat absorption tubes 1 are set according to different second areas, and different heat exchange fluid flow rates are set for the heat absorption tube 1 of each second area according to the actual temperature state of the corresponding second area (each second area sets the heat exchange fluid flow rate according to the average first temperature value of the first area constituting it) to meet the heat exchange demand of the corresponding second area, and finally ensure that the waste heat utilization of each second area is more in line with the corresponding temperature state.

[0070] Embodiment 3, based on Embodiment 1 or 2, further comprises:

[0071] The second temperature sensor is used to detect the temperature of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell 3;

[0072] A first flow rate sensor is used to detect the flow rate of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell 3;

[0073] Environmental detection module, used for real-time detection of environmental parameters, including: ambient temperature and ambient humidity;

[0074] The first curve construction module is used to periodically (the period may be half a month or one month) construct a curve of the change of the temperature of the heat exchange fluid at the heat exchange fluid inlet with the working time of the first delivery pump 17 under each working mode of the pultrusion die 18 (including the working modes of the pultrusion die 18 and the first delivery pump 17), and the first delivery pump 17 works at the first power corresponding to each working mode for a second preset time (which may be the common continuous working time of the first delivery pump 17, which may be 8 hours, or one working shift of the first delivery pump 17);

[0075] The second curve construction module is used to periodically construct a curve of the change of the flow rate of the heat exchange fluid at the heat exchange fluid inlet as the working time of the first delivery pump 17 changes under each working mode of the pultrusion die 18 and the first delivery pump 17 works at the first power corresponding to each working mode for a second preset time;

[0076] The first detection module is used to periodically obtain the ratio of the heat added by the air in the heat exchange tube 16 to the heat dissipation of the heat exchange fluid in the heat exchange shell 3;

[0077] A first storage module, used for storing the detection value of the second temperature sensor, the detection value of the environment detection module, the curve constructed by the first curve construction module and the curve constructed by the second curve construction module based on the timestamp;

[0078] A first division module is used to divide the change curve of the heat exchange fluid temperature at the heat exchange fluid inlet as the first delivery pump 17 works for a period of time into a plurality of first curve segments and number them, the difference between the maximum value and the minimum value of the ordinate of each first curve segment is less than or equal to the first difference, and the abscissa of each first curve segment is continuous in time;

[0079] A second division module is used to divide the curve of the change of the flow rate of the heat exchange fluid at the heat exchange fluid inlet as the working time of the first delivery pump 17 into a plurality of second curve segments and number them, the difference between the maximum value and the minimum value of the ordinate of each second curve segment is less than or equal to the second difference, and the abscissa of each second curve segment is continuous in time;

[0080] The second calculation module is used to calculate the target wind speed in the heat exchange tube 16 at the current moment based on the detection value of the environmental detection module at the current moment and the first curve segment corresponding to the current working mode at the current moment obtained most recently, and the second curve segment corresponding to the current working mode at the current moment obtained most recently. The control device controls the air supply device 9 to operate so that the actual wind speed at the inlet of the heat exchange tube 16 is the target wind speed.

[0081] Preferably, the second calculation module calculates based on the following formula:

[0082]

[0083] v 2 is the target wind speed; T 1 is the average ordinate of the first curve segment corresponding to the current working mode at the current moment acquired most recently; K 1 K is the average slope of the first curve segment corresponding to the current working mode at the current time acquired most recently (for example, the current time is the working time of the first delivery pump 17 of the current working shift, 5 minutes; K 1 is the average slope of the first curve segment where the first delivery pump 17 works for 5 minutes when the temperature of the heat exchange fluid at the heat exchange fluid inlet changes with the working time of the first delivery pump 17 is constructed most recently); ε 1 is the first temperature adjustment coefficient (the value is greater than 0 and less than 0.5; the value can be 0.137); ln is the natural logarithm, e is the natural constant; T 2 is the target temperature of the heat exchange fluid outlet of the heat exchange shell 3; c 1is the constant pressure specific heat capacity of the heat transfer fluid; v 1 is the average flow velocity of the second curve segment corresponding to the current moment; ρ 1 is the density of the heat transfer fluid; A s A is the actual detection value of the sth environmental parameter affecting the temperature of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell 3 detected by the current environmental detection module; s0 is the detected value of the sth environmental parameter affecting the temperature of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell when the variation curve of the temperature of the heat exchange fluid at the heat exchange fluid inlet as a function of the working time of the first delivery pump 17 is constructed most recently in the current working mode; for The corresponding second temperature adjustment coefficient (can be based on the preset - The second temperature adjustment coefficient mapping table is obtained; or based on the following formula ); M is the total number of environmental parameters affecting the temperature of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell detected by the environmental detection module; ω is the ratio of the heat increase of the air in the heat exchange tube 16 to the heat dissipation of the heat exchange fluid in the heat exchange shell 3 obtained most recently; c 2 is the constant pressure specific heat capacity of the current ambient air; ρ 2 is the density of ambient air at the current moment; T 4 is the ambient air temperature at the current moment; T 3 is the target air temperature at the outlet of the heat exchange tube 16; K 2 K is the average slope of the second curve segment corresponding to the current working mode at the current time acquired most recently (for example, the current time is the working time of the first delivery pump 17 of the current working shift, 5 minutes; K 2 is the average slope of the second curve segment where the first delivery pump 17 works for 5 minutes when the temperature of the heat exchange fluid at the heat exchange fluid inlet changes with the working time of the first delivery pump 17 is constructed most recently); ε 2 is the first flow rate adjustment coefficient (the value is greater than 0 and less than 0.3; the value can be 0.143); ε 3 is the third temperature adjustment coefficient (the value is greater than 0 and less than 0.5; the possible value is 0.133).

[0084] The beneficial effects of the above technical solution are:

[0085] Since the pultrusion die 18 is used for a long time, the working performance may change, resulting in changes in the state of the generated heat. The first delivery pump 17 may also change its working performance after working for a long time. Therefore, it is necessary to periodically control the first delivery pump 17, the first curve construction module, and the second curve construction module to test the waste heat utilization of the pultrusion die 18. Each time, the first delivery pump 17 is obtained to work at the first power corresponding to each working mode for the second preset time (the commonly used continuous working time of the first delivery pump 17). The heat entry state of the heat exchange shell 3 under the commonly used continuous working time of the first delivery pump 17 (corresponding to the commonly used continuous working state of the pultrusion die 18) is obtained (the change curve of the heat exchange fluid temperature at the heat exchange fluid inlet with the working time of the first delivery pump 17, and the change curve of the heat exchange fluid flow rate at the heat exchange fluid inlet with the working time of the first delivery pump 17). The heat entry state of the heat exchange shell 3 under the second preset continuous working time is obtained, so as to facilitate the control of the air supply device 9 according to this.

[0086] Specifically: based on the detection value of the environmental detection module at the current moment and the first curve segment corresponding to the current working mode (including the working mode of the pultrusion die 18 and the first delivery pump 17) acquired most recently, and the second curve segment corresponding to the current working mode acquired most recently at the current moment, the target wind speed in the heat exchange tube 16 at the current moment is calculated, and the control device controls the air supply device 9 to operate so that the actual wind speed at the inlet of the heat exchange tube 16 is the target wind speed, so as to determine the appropriate wind speed at the inlet of the heat exchange tube 16 according to the continuous heat supply state of the heat exchange shell 3 acquired most recently and the current actual ambient air parameters, so as to ensure that the actual heat supply state at the inlet of the heat exchange tube 16 is more matched with the actual heat supply state of the heat exchange shell 3.

[0087] The first division module and the second division module are segmented to obtain a first curve segment with a small temperature fluctuation that is continuous over time, and a second curve segment with a small flow velocity fluctuation that is continuous over time, and the wind speed at the inlet of the heat exchange tube 16 is controlled by the air intake state of one curve segment, thereby avoiding constant adjustment of the wind speed at the inlet of the heat exchange tube 16 and making the adjustment more reliable.

[0088] Embodiment 4, based on any one of Embodiments 1-3, further comprises:

[0089] A first acquisition module, used to obtain the control parameters of the air supply device 9 (which may be the power frequency of the first fan);

[0090] A second acquisition module is used to obtain the outlet parameters of the air supply device 9, the outlet parameters including: outlet flow rate and outlet pressure; the second acquisition module can be set at the outlet of the air supply device;

[0091] A third calculation module, periodically selecting the latest detection result of the second acquisition module within a third preset time period to calculate the intake state value;

[0092]

[0093] F is the intake state value corresponding to the selected third preset time length; Q 1 , Q 2 , Q 3 , Q 4 are respectively the average outflow rate, the maximum outflow rate, the minimum outflow rate, and the standard deviation of the outflow rate detected by the second acquisition module within the selected third preset time period; θ 1 ,θ 2 are the first flow weight and the second flow weight respectively (the value is greater than 0 and less than 1; the values ​​can be 0.174 and 0.103 respectively); P 1 , P 2 , P 3 , P 4 are respectively the average outlet air pressure, the maximum outlet air pressure, the minimum outlet air pressure, and the standard deviation of the outlet air pressure detected by the second acquisition module within the selected third preset time period; θ 3 ,θ 4 They are the first air pressure weight and the second air pressure weight respectively (the value is greater than 0 and less than 1; the values ​​can be 0.167 and 0.112 respectively);

[0094] A second storage module, used for associating and storing the detection value of the first acquisition module and the detection value of the second acquisition module and the intake state value based on a timestamp;

[0095] The second acquisition module is used to obtain the target air intake state value range of the air supply device 9 currently working;

[0096] A third acquisition module is used to obtain a first historical control parameter of the air supply device 9 when the air supply device 9 has been operating normally in the past and the air intake state value is within the target air intake state value range, and the control device controls the current working third preset time of the air supply device 9 with the average value of the first historical control parameter obtained by the third acquisition module, and calculates the current air intake state value of the third preset time by the third calculation module;

[0097] A first alarm module, which generates an alarm when the current intake state value of the third preset time length is not within the target intake state value range of the current operation of the air supply device 9;

[0098] A fourth acquisition module is used to obtain a target historical control parameter of the air supply device when the air supply device has been operating normally in the past and the historical air intake state value is the current air intake state value of the third preset time length;

[0099] The second alarm module is configured to generate an alarm when the absolute value of the difference between the target historical control parameter and the average value of the first historical control parameter obtained by the third obtaining module is greater than a preset difference threshold.

[0100] The beneficial effects of the above technical solution are:

[0101] Since the air supply device 9 works for a long time, the working performance may be abnormal; the third calculation module periodically selects the latest detection result of the second acquisition module within the third preset time to calculate the intake state value, so as to obtain the latest air supply capacity state of the air supply device;

[0102] The working requirement of the current operation of the air supply device 9 (the target air intake state value range of the current operation of the air supply device 9) is obtained through the second acquisition module, and then the first historical control parameter is screened out based on the working requirement of the current operation of the air supply device 9. The control device controls the third preset duration of the current operation of the air supply device 9 with the average value of the first historical control parameter obtained by the third acquisition module, and calculates the current air intake state value of the third preset duration through the third calculation module, so as to select appropriate control parameters to test the working performance of the air supply device 9 at present;

[0103] When the current intake state value of the third preset time length is not within the target intake state value range of the current operation of the air supply device 9, an alarm is issued to realize timely alarm of abnormal test results, thereby ensuring the reliable operation of the present invention.

[0104] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. Online waste heat drying auxiliary heating circulation system, characterized by: include: A heat absorbing tube (1), the heat absorbing tube (1) being arranged in a pultrusion die (18) or being wound around the pultrusion die (18); The heat exchange shell (3) is connected to the upper end of the heat exchange shell (3) through a first bracket (2). An air inlet shell (4) and an air outlet shell (5) are respectively arranged on both sides of the heat exchange shell (3). A plurality of heat exchange tubes (16) are arranged horizontally at intervals in the heat exchange shell (3). Both ends of the heat exchange tubes (16) are respectively connected to the air inlet shell (4) and the air outlet shell (5). One end of the heat absorption tube (1) is connected to a fourth pipe (13). The fourth pipe (13) is connected to a heat exchange fluid storage The heat absorbing pipe (1) is connected to a heat exchange fluid storage tank (11), the other end of the heat absorbing pipe (1) is connected to an inlet end of a first delivery pump (17), the outlet end of the first delivery pump (17) is connected to an inlet end of a heat exchange fluid of the heat exchange shell (3) through a fifth pipe (19), the outlet end of the heat exchange fluid of the heat exchange shell (3) is connected to a return pipe (12), the return pipe (12) is connected to an inlet end of a second delivery pump (15), and the outlet end of the second delivery pump (15) is connected to a heat exchange fluid storage tank (11) through a sixth pipe (20); A first pipeline (6), one end of the first pipeline (6) is connected to the gas outlet end of the gas supply device (9), and the other end of the first pipeline (6) is connected to the gas inlet shell (4); a second pipe (7) and a third pipe (8), wherein the first end of the second pipe (7) is connected to the gas outlet housing (5), the second end of the second pipe (7) is connected to the first end of the third pipe (8), the second end of the third pipe (8) is connected to the gas inlet end of the gas exhaust device (10), and the gas outlet end of the gas exhaust device (10) is connected to the drying box (14) via a seventh pipe (21); A control device is electrically connected to the air supply device (9) and the air exhaust device (10) respectively.

2. The online waste heat drying auxiliary heating circulation system according to claim 1 is characterized in that: The second end of the second pipeline (7) is directly connected to the first end of the third pipeline (8) or is connected to the first end of the third pipeline (8) through a gas heating device.

3. The online waste heat drying auxiliary heating circulation system according to claim 1 is characterized in that: The heat exchange fluid is heat exchange oil or water.

4. The online waste heat drying auxiliary heating circulation system according to claim 1 is characterized in that: The air supply device (9) is a first fan or a first air pump, and the air exhaust device (10) is a second fan or a second air pump.

5. The online waste heat drying auxiliary heating circulation system according to claim 1 is characterized in that: Also includes: A first region division module is used to obtain a pultrusion die (18) model, and divide the pultrusion die (18) model into a plurality of first regions at even intervals along the length direction and number the first regions, and to evenly space a plurality of first temperature sensors in each first region; A first acquisition module is used to acquire a first temperature sensor detection value within a first preset time period when the pultrusion die (18) needs to start waste heat recovery in a current working mode of the pultrusion die (18); A first calculation module, used for calculating a first temperature value of each first area based on a detection value of the first temperature sensor; A second area division module is used to divide the pultrusion die (18) model into a plurality of second areas along the length direction and number them, wherein the second area is composed of a plurality of first areas with consecutive numbers, and the absolute value of the difference between the first temperature values ​​of any two first areas of the same second area is less than a first preset value; each second area is wound with a heat absorbing tube (1), the heat exchange fluid inlet of each heat absorbing tube (1) is connected to the first main delivery tube through a first connecting branch tube, the first main delivery tube is connected to the fourth pipeline (13), the heat exchange fluid outlet of each heat absorbing tube (1) is connected to the second main delivery tube through a second connecting branch tube, the heat exchange fluid outlet of the second main delivery tube is connected to the inlet end of the first delivery pump (17), and each first connecting branch tube is connected to a control valve.

6. The online waste heat drying auxiliary heating circulation system according to claim 5 is characterized in that: The first calculation module calculates the first temperature value of each first area based on the following formula; T i1 is the first temperature value of the i-th first region; M i is the total number of first temperature sensors in the i-th first area; T ij1 The average detection value of the j-th first temperature sensor in the ith first area acquired by the first acquisition module; T ij2 is the maximum detection value of the jth first temperature sensor in the i-th first area acquired by the first acquisition module; T ij3 is the minimum detection value of the jth first temperature sensor in the i-th first area acquired by the first acquisition module; t ij T ij2 and T ij3 The corresponding time interval; lg is the logarithm with base 10; ln is the natural logarithm, e is the natural constant; n i1 is T of the first region i ij1 Greater than The total number of first temperature sensors; n i2 is T of the first region i ij1 Less than The total number of first temperature sensors; for The corresponding temperature correction coefficient; ∝0 is Corresponding benchmark value / theoretical value.

7. The online waste heat drying auxiliary heating circulation system according to claim 1 is characterized in that: Also includes: A second temperature sensor, used for detecting the temperature of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell (3); A first flow rate sensor, used for detecting the flow rate of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell (3); Environmental detection module, used for real-time detection of environmental parameters, including: ambient temperature and ambient humidity; A first curve building module is used to periodically build a curve of the change of the temperature of the heat exchange fluid at the heat exchange fluid inlet as the first delivery pump (17) works for a second preset time at a first power corresponding to each working mode in each working mode under each working mode of the pultrusion die (18); A second curve construction module is used to periodically construct a curve of the change of the flow rate of the heat exchange fluid at the heat exchange fluid inlet as the first delivery pump (17) works for a second preset time at a first power corresponding to each working mode in each working mode under each working mode of the pultrusion die (18); A first detection module is used to periodically obtain the ratio of the heat added by the air in the heat exchange tube (16) to the heat dissipation of the heat exchange fluid in the heat exchange shell (3); A first storage module, used for storing the detection value of the second temperature sensor, the detection value of the environment detection module, the curve constructed by the first curve construction module and the curve constructed by the second curve construction module based on the timestamp; A first division module is used to divide a curve of a change in the temperature of the heat exchange fluid at the heat exchange fluid inlet as the first delivery pump (17) works into a plurality of first curve segments and number them, wherein the difference between the maximum value and the minimum value of the ordinate of each first curve segment is less than or equal to the first difference, and the abscissa of each first curve segment is continuous in time; A second division module is used to divide the curve of the change of the flow rate of the heat exchange fluid at the heat exchange fluid inlet as the first delivery pump (17) works into a plurality of second curve segments and number them, the difference between the maximum value and the minimum value of the ordinate of each second curve segment is less than or equal to the second difference, and the abscissa of each second curve segment is continuous in time; The second calculation module is used to calculate the target wind speed in the heat exchange tube (16) at the current moment based on the detection value of the environmental detection module at the current moment and the first curve segment corresponding to the current working mode at the current moment obtained most recently and the second curve segment corresponding to the current working mode at the current moment obtained most recently. The control device controls the air supply device (9) to operate so that the actual wind speed at the inlet of the heat exchange tube (16) is the target wind speed.

8. The online waste heat drying auxiliary heating circulation system according to claim 7 is characterized in that: The second calculation module is based on the following calculation formula: v2 is the target wind speed; T1 is the average ordinate of the first curve segment corresponding to the current working mode at the current moment obtained most recently; K1 is the average slope of the first curve segment corresponding to the current working mode at the current moment obtained most recently; ε1 is the first temperature adjustment coefficient; ln is the natural logarithm, and e is the natural constant; T2 is the target temperature of the heat exchange fluid outlet of the heat exchange shell (3); c1 is the constant pressure specific heat capacity of the heat exchange fluid; v1 is the average flow rate of the second curve segment corresponding to the current moment; ρ1 is the density of the heat exchange fluid; A s is the actual detection value of the sth environmental parameter affecting the temperature of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell (3) detected by the current environmental detection module; s0 The detected value of the sth environmental parameter affecting the temperature of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell when the curve of the change of the temperature of the heat exchange fluid at the heat exchange fluid inlet as a function of the working time of the first delivery pump (17) is constructed most recently in the current working mode; for The corresponding second temperature adjustment coefficient; M is the total number of environmental parameters affecting the temperature of the heat exchange fluid at the heat exchange fluid inlet of the heat exchange shell detected by the environmental detection module; ω is the ratio of the heat increase of the air in the heat exchange tube (16) to the heat dissipation of the heat exchange fluid in the heat exchange shell (3) obtained most recently; c2 is the constant pressure specific heat capacity of the current ambient air; ρ2 is the density of the ambient air at the current moment; T4 is the ambient air temperature at the current moment; T3 is the target air temperature at the outlet of the heat exchange tube (16); K2 is the average slope of the second curve segment corresponding to the current working mode at the current moment obtained most recently; ε2 is the first flow rate adjustment coefficient; ε3 is the third temperature adjustment coefficient.

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