CN107462105B - Waste gas waste heat recovery automatic cleaning non-uniform heat pipe heat exchanger and automatic cleaning method - Google Patents
Waste gas waste heat recovery automatic cleaning non-uniform heat pipe heat exchanger and automatic cleaning method Download PDFInfo
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- CN107462105B CN107462105B CN201710718593.9A CN201710718593A CN107462105B CN 107462105 B CN107462105 B CN 107462105B CN 201710718593 A CN201710718593 A CN 201710718593A CN 107462105 B CN107462105 B CN 107462105B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/003—Control arrangements
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Abstract
The invention discloses an automatic cleaning non-uniform heat pipe heat exchanger for waste gas waste heat recovery and an automatic cleaning method. The heat pipe heat exchanger comprises a heat exchanger shell, wherein a heat pipe heat exchange part and an automatic cleaning assembly are arranged in the heat exchanger shell, and the heat exchanger shell is internally divided into a lower-layer hot flow channel and an upper-layer cold flow channel; the cold flow channel at the upper layer flows fresh air at normal temperature, and the hot flow channel at the lower layer flows waste gas at high temperature. The heat of the high-temperature heat setting waste gas is transferred to the normal-temperature fresh air of the cold flow channel through the intermediate partition plate and the heat pipe, and the heat exchange between the high-temperature heat setting waste gas and the fresh air is completed. According to the invention, the automatic cleaning component is added and the automatic cleaning control is carried out, so that the automatic cleaning of the heat exchanger is realized, the working efficiency of the heat exchanger is effectively improved, and the working cost of an enterprise is reduced. The invention has high heat transfer efficiency, long service life and good anti-blocking performance, and is particularly suitable for heat setting waste gas waste heat recovery occasions of printing and dyeing enterprises.
Description
Technical Field
The invention relates to a heat pipe heat exchanger, in particular to an automatic cleaning non-uniform heat pipe heat exchanger and an automatic cleaning method applied to heat setting waste gas waste heat recovery.
Technical Field
As a large printing and dyeing country, china still has many defects in printing and dyeing equipment and technology, such as high energy consumption, large pollution discharge and the like. The heat setting machine is important equipment in the printing and dyeing process, and has the main functions of performing after-finishing work such as airflow drying, tentering setting and the like on the pretreated fabric. Through heat setting, the phenomena of uneven width, inclined weft yarns and the like after the pretreatment of the fabric can be effectively improved, and the mechanical performance and the product comfort of the fabric are improved. However, the heat setting machine can generate a large amount of high-temperature waste gas during working, and direct discharge can cause a large amount of energy waste. Therefore, if the waste heat recovery is carried out on the high-temperature waste gas discharged by the heat setting machine during working, the energy consumption of the printing and dyeing industry can be effectively reduced, and the production cost is reduced. One effective method is to use a heat exchanger to recover the waste heat of the high-temperature printing and dyeing waste gas. At present, the heat exchanger technology is mature, and the heat exchangers in the market are mainly divided into plate heat exchangers, shell type heat exchangers, heat pipe type heat exchangers and the like. However, the heat-setting high-temperature exhaust gas contains volatile matters and condensate of the printing and dyeing auxiliary and the solvent, and also contains fine textile fibers and dust. These impurities tend to adhere to the surfaces of the tubes, reducing the operating efficiency of the heat exchanger and, in severe cases, can also clog the heat exchanger, resulting in heat exchanger failure. Therefore, the design and optimization of the heat setting waste heat recovery heat exchanger also need to consider the problem of flow channel blockage.
Aiming at a printing and dyeing waste heat recovery heat exchanger, chinese invention patent (CN 104075615A) discloses a shell-and-tube heat exchanger, which removes solid oil stains in a through-flow area through a mechanical mode, assembles a cleaning plate and a power screw together, enables the cleaning plate to move in the through-flow area of the heat exchanger along the screw, and scrapes and mills the solid oil stains to achieve the purpose of cleaning. The heat exchanger can realize the cleaning function of the through-flow channel, but cannot realize the automatic control of the cleaning function.
The Chinese invention patent (CN 103424029A) discloses a shell-and-tube heat exchanger, which is specifically applied to a terylene production process, and a chemical method is adopted to clean tiny terylene fibers in the heat exchanger. The adopted principle is that triethylene glycol can dissolve terylene under the condition of high temperature. The invention has good cleaning effect, but the time consumption is too long, and the automatic control of cleaning can not be realized.
The heat exchanger applied to heat setting waste gas waste heat recovery at present generally has the problems of low heat exchange efficiency and easy blockage of a heat setting waste gas flow channel, so that the large-scale popularization of the heat exchanger for heat setting waste gas waste heat recovery is limited, and therefore, the heat exchanger which is high in heat exchange efficiency and can automatically clean impurity pollutants in the heat setting waste gas flow channel is necessary to be provided.
Disclosure of Invention
The invention aims to provide an automatic cleaning non-uniform heat pipe heat exchanger for waste gas waste heat recovery and an automatic cleaning method. The automatic cleaning device realizes the automatic cleaning of the heat exchanger by adding the automatic cleaning component and performing automatic cleaning control. Through the analysis of the blocking degree in the flow channel and the oil stain adhesion degree on the surface of the heat pipe, the heat exchanger can effectively improve the heat exchange efficiency of the heat exchanger and prevent the heat exchanger from being blocked by automatically cleaning the impurity pollutants of the heat setting waste gas channel. Moreover, the heat pipes are arranged in a non-uniform distribution manner, so that fluid is more effectively contacted with the heat pipes, and the heat exchange efficiency of the heat exchanger is effectively improved. The heat exchanger is high in efficiency, long in service life and good in anti-blocking performance, can effectively recover the waste heat of the heat setting waste gas, effectively reduces the working cost of enterprises, and is particularly suitable for the heat setting waste gas waste heat recovery occasions of printing and dyeing enterprises.
The technical scheme adopted by the invention is as follows:
a waste gas waste heat recovery self-cleaning non-uniform heat pipe heat exchanger comprises a heat exchanger shell, wherein a heat pipe heat exchange part and a self-cleaning assembly are arranged in the heat exchanger shell; wherein:
the heat pipe heat exchange part is arranged in the heat exchanger shell and divides the inside of the heat exchanger shell into a lower-layer hot flow channel and an upper-layer cold flow channel which are not mixed with each other; the heat pipe heat exchange assembly comprises a middle partition plate, through holes distributed in a non-uniform array structure are formed in the middle partition plate, heat pipes distributed in a non-uniform array structure are vertically inserted into the through holes distributed in the non-uniform array structure, and the through holes are divided into an evaporation section positioned in a lower-layer heat flow channel and a condensation section positioned in an upper-layer cold flow channel by the middle partition plate;
the two side walls of the heat exchanger shell positioned in the lower-layer heat flow channel are respectively provided with a heat setting waste gas inlet and a heat setting waste gas outlet, and the heat setting waste gas inlet and the heat setting waste gas outlet are coaxially arranged; a fresh air inlet and a fresh air outlet are respectively formed in two side walls of the heat exchanger shell positioned in the upper cold flow channel, and the fresh air inlet and the fresh air outlet are coaxially formed; the heat setting waste gas inlet and the fresh air inlet are positioned on the same side of the heat exchanger shell, and the heat setting waste gas outlet and the fresh air outlet are positioned on the same side of the heat exchanger shell; a circular groove is formed in the center of the bottom surface in the heat exchanger shell, and a central circular through hole is formed in the center of the circular groove; first circumferential circular through holes are uniformly distributed on the circular grooves on the outer sides of the central circular through holes;
the circular groove on the inner bottom surface of the heat exchanger shell is provided with an automatic cleaning assembly; the automatic cleaning component comprises a movable cleaning piece, a sealing gasket and a fixing nut; the movable cleaning part comprises a disc assembled on the circular groove, and second circumferential circular through holes corresponding to the first circumferential circular through holes are uniformly distributed on the disc; a cylinder which is flexibly connected with the output shaft of the first stepping motor and can penetrate through the central circular through hole is arranged in the center of the disc 18, threads are processed on the outer surface of the cylinder, the fixing nut is screwed with the threads processed on the outer surface of the cylinder and connected with the output shaft of the second stepping motor; a sealing gasket is arranged between the circular groove and the disc, and a through hole for the cylinder to pass through is formed in the center of the sealing gasket; and third circumferential circular through holes corresponding to the first circumferential circular through holes are uniformly distributed on the sealing pad.
The diameter of the central circular through hole in the center of the bottom surface of the heat exchanger shell is larger than that of the first circumferential circular through hole.
The diameter of a disc of the movable cleaning part is smaller than that of a circular groove in the bottom surface of the heat exchanger shell, and the height of the disc is smaller than the depth of the circular groove in the bottom surface of the heat exchanger shell; the diameter of the cylinder is smaller than that of the central circular through hole in the bottom surface of the heat exchanger shell, and the length of the cylinder is larger than the depth of the central circular through hole in the circular groove in the bottom surface of the heat exchanger shell.
The diameter of the first circumferential round through hole in the round groove in the center of the bottom surface of the heat exchanger shell is the same as the diameter of the second circumferential round through hole in the disc of the movable cleaning piece and the diameter of the third circumferential round through hole in the sealing gasket.
The heat exchanger shell is connected with the middle partition plate in a welding mode; and the heat exchanger shell is an aluminum alloy heat exchanger shell.
The heat setting waste gas inlet, the fresh air inlet, the heat setting waste gas outlet and the fresh air outlet are respectively provided with a thermocouple and a pressure sensor; the pressure sensor and the thermocouple are respectively connected with a signal processing device, the signal processing device is connected with a microprocessor, and the microprocessor is respectively connected with a first stepping motor, a second stepping motor and a hydraulic pump through the signal processing device; the first stepping motor is connected with the cylinder of the movable cleaning piece; the second stepping motor is connected with the fixing nut; the hydraulic pump 26 is connected to a cleaning solution bottle.
An automatic cleaning method for automatically cleaning a non-uniform heat pipe heat exchanger by waste gas waste heat recovery comprises the following steps: before the heat exchanger starts to work, the positions of the second circumferential circular through hole on the disc of the movable cleaning piece and the first circumferential circular through hole on the bottom surface of the heat exchanger shell are staggered, so that a flow channel cannot be formed; the fixed nut is initially matched with the threads on the outer surface of the cylinder and screwed on the bottom surface of the heat exchanger shell, a disc of the movable cleaning piece is tightly pressed with the bottom surface of the heat exchanger shell, and sealing is realized under the working state that cleaning is not required;
when the heat exchanger works, the thermocouple is adopted to respectively measure the temperature difference between the heat setting waste gas inlet and the heat setting waste gas outlet and the temperature difference between the fresh air inlet and the fresh air outlet; the pressure sensors are adopted to respectively measure the pressure difference between the heat setting waste gas inlet and the heat setting waste gas outlet and the pressure difference between the fresh air inlet and the fresh air outlet, and a pressure difference signal and a temperature difference signal are transmitted to the microprocessor; after the microprocessor obtains the temperature difference and pressure difference signals, the temperature difference and pressure difference signals are calculated and processed, and are compared and analyzed with a preset temperature difference standard value and a preset pressure difference standard value; when the actual temperature difference value is smaller than the minimum temperature difference standard value or the actual pressure difference value is larger than the maximum pressure difference standard value, the microprocessor sends an execution signal to the second stepping motor, the second stepping motor rotates, the fixed nut is unscrewed, and the cylinder of the movable cleaning piece is driven to rise; the microprocessor sends an execution signal to the second stepping motor, and the second stepping motor rotates to drive the cylinder of the movable cleaning piece to rotate; aligning the second circumferential circular through hole of the disc of the movable cleaning piece with the first circumferential circular through hole on the bottom surface of the heat exchanger shell and the third circumferential circular through hole on the sealing gasket to form a flow channel; simultaneously, the microprocessor sends an execution command to the hydraulic pump, the hydraulic pump is started, the cleaning solution bottle conveys the cleaning solution contained in the cleaning solution bottle to flow through the first circumferential circular through hole on the bottom surface of the heat exchanger shell and the second circumferential circular through hole of the movable cleaning piece through the hydraulic pump, then the lower-layer heat flow channel is cleaned, and the cleaned impurity pollutants flow out of the heat exchanger shell along with the heat setting waste gas outlet;
during cleaning, the microprocessor continuously receives temperature difference and pressure difference signals transmitted by the thermocouple and the pressure sensor, compares the temperature difference and the pressure difference signals with a set standard value, and sends a stop instruction to the hydraulic pump when an actual temperature difference value is greater than a maximum temperature difference standard value and an actual pressure difference value is less than a minimum pressure difference standard value, so that the hydraulic pump stops working; the microprocessor sends an execution signal to the first stepping motor, the first stepping motor rotates to drive the cylinder of the movable cleaning piece to rotate, and the second circumferential circular through hole on the disc of the movable cleaning piece is staggered with the first circumferential circular through hole on the bottom surface of the heat exchanger shell to form a flow channel; meanwhile, the microprocessor sends an execution signal to the second stepping motor, the second stepping motor rotates to screw the fixing nut tightly, the cylinder of the movable cleaning piece is driven to descend, the disc of the movable cleaning piece is tightly pressed with the bottom surface of the heat exchanger shell, and sealing is achieved.
The invention has the beneficial effects that:
firstly, the automatic cleaning structure is added in the heat exchanger, and the heat transfer efficiency of the heat exchanger can be effectively improved and the blocking degree of the heat setting waste gas to the lower-layer heat flow channel can be reduced by monitoring and cleaning the heat setting waste gas flow channel. Secondly, the invention provides the automatic cleaning non-uniform heat pipe heat exchanger for recovering the waste heat of the printing and dyeing heat setting waste gas and the automatic cleaning method, so that the automatic cleaning of the heat exchanger can be realized. This saves much time in manual disassembly and cleaning operations. Therefore, the arrangement of the automatic cleaning structure can effectively improve the working efficiency of the heat exchanger and reduce the enterprise cost. The heat pipes are arranged in a non-uniform array structure. Through improving the heat pipe distribution, the contact of the heat exchange fluid and the heat pipe is more sufficient and uniform, and the heat exchange efficiency is further improved.
Description of the specific figures
FIG. 1 is an assembly schematic of the present invention;
FIG. 2 is an external structural view of FIG. 1;
FIG. 3 is a schematic view of the bottom surface of the heat exchanger shell of FIG. 1;
FIG. 4 is a schematic view of the structure of FIG. 1 when the intermediate partition is connected to the heat pipe;
FIG. 5 is a schematic diagram of the operation of the heat exchange unit and the automatic cleaning assembly of the heat pipe of FIG. 1;
FIG. 6 is a schematic view of the structure of the intermediate partition in FIG. 5;
FIG. 7 is a schematic view of the installation of the movable cleaning element, gasket and heat exchanger housing of FIG. 5;
FIG. 8 is a schematic view of the movable cleaning element of FIG. 5;
FIG. 9 is a hardware block diagram of the present invention;
FIG. 10 is a block diagram of the heat exchanger control flow of the present invention.
Detailed Description
The invention is further explained by combining the attached drawings and the embodiment, and the printing and dyeing heat setting waste gas waste heat recovery automatic cleaning non-uniform heat pipe heat exchanger in the embodiment is shown in figures 1 to 8, and the waste gas waste heat recovery automatic cleaning non-uniform heat pipe heat exchanger comprises a heat exchanger shell 1, wherein a heat pipe heat exchange part 2 and an automatic cleaning assembly 3 are arranged in the heat exchanger shell 1; wherein:
the heat pipe heat exchange component 2 is arranged in the heat exchanger shell 1 and divides the interior of the heat exchanger shell 1 into a lower-layer heat flow channel 11 and an upper-layer cold flow channel 12 which are not mixed with each other; the heat pipe heat exchange assembly 2 comprises a middle partition plate 14, through holes distributed in a non-uniform array structure are formed in the middle partition plate 14, heat pipes 13 distributed in a non-uniform array structure are vertically inserted into the through holes distributed in the non-uniform array structure, and the through holes are divided into an evaporation section located in a lower-layer heat flow channel 11 and a condensation section located in an upper-layer cold flow channel 12 by the middle partition plate 14;
two side walls of the heat exchanger shell 1 positioned in the lower layer heat flow channel 11 are respectively provided with a heat setting waste gas inlet 4 and a heat setting waste gas outlet 6, and the heat setting waste gas inlet 4 and the heat setting waste gas outlet 6 are coaxially arranged; a fresh air inlet 5 and a fresh air outlet 7 are respectively arranged on two side walls of the heat exchanger shell 1 positioned at the upper layer cold flow channel 12, and the fresh air inlet 5 and the fresh air outlet 7 are coaxially arranged; the heat setting waste gas inlet 4 and the fresh air inlet 5 are positioned on the same side of the heat exchanger shell 1, and the heat setting waste gas outlet 6 and the fresh air outlet 7 are positioned on the same side of the heat exchanger shell 1; a circular groove is formed in the center of the inner bottom surface of the heat exchanger shell 1, and a central circular through hole 9 is formed in the center of the circular groove; a first circumferential circular through hole 10 is uniformly distributed on the circular groove at the outer side of the central circular through hole 9;
the circular groove on the inner bottom surface of the heat exchanger shell 1 is provided with an automatic cleaning assembly 3; the automatic cleaning component 3 comprises a movable cleaning part 15, a sealing gasket 16 and a fixed nut 17; the movable cleaning part 15 comprises a disc 18 arranged on a circular groove, and second circumferential circular through holes 19 corresponding to the first circumferential circular through holes 10 are uniformly distributed on the disc 18; a cylinder 20 which is flexibly connected with an output shaft of a first stepping motor 25 and can penetrate through a central circular through hole 9 is arranged in the center of the disc 18, threads are processed on the outer surface of the cylinder 20, the fixing nut 17 is connected with the outer surface of the cylinder 20 in a threaded manner, and the fixing nut 17 is also connected with an output shaft of a second stepping motor 28; a sealing gasket 16 is arranged between the circular groove and the disc 18, and a through hole for the cylinder 20 to pass through is formed in the center of the sealing gasket 16; and third circumferential circular through holes 8 corresponding to the first circumferential circular through holes 10 are uniformly distributed on the sealing gasket 16. The thickness of the sealing gasket 16 is 2mm.
The diameter of the central circular through hole 9 at the center of the bottom surface of the heat exchanger shell 1 is larger than that of the first circumferential circular through hole 10.
The diameter of the disc 18 of the movable cleaning piece 15 is smaller than that of the circular groove on the bottom surface of the heat exchanger shell 1, and the height of the disc 18 is smaller than the depth of the circular groove on the bottom surface of the heat exchanger shell 1; the diameter of the cylinder 20 is smaller than that of the central circular through hole 9 in the bottom surface of the heat exchanger shell 1, and the length of the cylinder 20 is larger than the depth of the central circular through hole 9 in the circular groove in the bottom surface of the heat exchanger shell 1.
The aperture of the first circumferential circular through hole 10 on the circular groove at the center of the bottom surface of the heat exchanger shell 1 is the same as the aperture of the second circumferential circular through hole 19 on the disc 18 of the movable cleaning piece 15 and the aperture of the third circumferential circular through hole 8 on the sealing gasket 16.
The heat exchanger shell 1 and the middle partition plate 14 are connected in a welding mode, so that the sealing performance of the heat exchanger shell is ensured; and the heat exchanger shell 1 is an aluminum alloy heat exchanger shell.
The hardware part in the embodiment is as follows: the heat setting waste gas inlet 4, the fresh air inlet 5, the heat setting waste gas outlet 6 and the fresh air outlet 7 are respectively provided with a thermocouple 21 and a pressure sensor 22; the pressure sensor 22 and the thermocouple 21 are respectively connected with a signal processing device 23, the signal processing device 23 is connected with a microprocessor 24, and the microprocessor 24 is respectively connected with a first stepping motor 25, a second stepping motor 28 and a hydraulic pump 26 through the signal processing device 23; the first stepping motor 25 is connected with the cylinder 20 of the movable cleaning member 15; the second stepping motor 28 is connected with the fixing nut 17; the hydraulic pump 26 is connected to a cleaning liquid bottle 27.
An automatic cleaning method for automatically cleaning a non-uniform heat pipe heat exchanger by waste heat recovery of waste gas is disclosed, as shown in fig. 5, 9 and 10, normal-temperature fresh air flows in an upper-layer cold flow channel 12, high-temperature heat setting waste gas flows in a lower-layer hot flow channel 11, the heat of the high-temperature heat setting waste gas is transferred to the normal-temperature fresh air in the upper-layer cold flow channel 12 through a middle partition plate 14 and a heat pipe 13 with high heat transfer efficiency, and heat exchange between the high-temperature heat setting waste gas and the normal-temperature fresh air in the heat exchanger is completed, so that waste heat recovery of the high-temperature heat setting waste gas is realized. The method comprises the following steps: before the heat exchanger starts to work, the second circumferential circular through hole 19 on the disc 18 of the movable cleaning piece 15 is staggered with the first circumferential circular through hole 10 on the bottom surface of the heat exchanger shell 1, so that a flow channel cannot be formed; the fixed nut 17 is initially matched with the thread on the outer surface of the cylinder 20 and is screwed on the bottom surface of the heat exchanger shell 1 to tightly press the disc 18 of the movable cleaning piece 15 with the bottom surface of the heat exchanger shell 1, so that sealing is realized under the working state that cleaning is not required, and heat setting waste gas is prevented from flowing into a pipeline where a cleaning solution bottle is located through the second circumferential circular through hole 19 of the movable cleaning piece 15, and the heat setting waste gas is prevented from leaking.
When the heat exchanger works, along with the continuous increase of the working time of the heat exchanger, the fiber, oil stain and other impurity pollutants carried in the high-temperature heat periodic waste gas can be continuously attached to the inner surfaces of the heat pipe 13 and the heat exchanger shell 1 to block the lower-layer heat flow channel 11. Along with the continuous deposition of impurity pollutants, the heat transfer performance of the heat exchanger is reduced, so that the pressure difference between a heat setting waste gas inlet 4 and a heat setting waste gas outlet 6 of a lower-layer heat flow channel 11 is increased, the pressure difference between a fresh air inlet 5 and a fresh air outlet 7 of an upper-layer cold flow channel 12 is increased, the temperature difference between the heat setting waste gas inlet 4 and the heat setting waste gas outlet 6 of the lower-layer heat flow channel 11 and the temperature difference between the fresh air inlet 5 and the fresh air outlet 7 of the upper-layer cold flow channel 12 are lower than those in a normal working state. Therefore, in the present embodiment, the thermocouple 21 is adopted to measure the temperature difference between the heat setting waste gas inlet 4 and the heat setting waste gas outlet 6, and the temperature difference between the fresh air inlet 5 and the fresh air outlet 7; the pressure sensor 22 is adopted to respectively measure the pressure difference between the heat setting waste gas inlet 4 and the heat setting waste gas outlet 6 and the pressure difference between the fresh air inlet 5 and the fresh air outlet 7, and a pressure difference signal and a temperature difference signal are transmitted to the microprocessor 24; after obtaining the temperature difference and pressure difference signals, the microprocessor 24 performs calculation processing, and performs comparison analysis with a preset temperature difference standard value and a preset pressure difference standard value; when the actual temperature difference value is smaller than the minimum temperature difference standard value or the actual pressure difference value is larger than the maximum pressure difference standard value, the microprocessor 24 sends an execution signal to the second stepping motor 28, the second stepping motor 28 rotates, the fixed nut 17 is unscrewed, and the cylinder 20 of the movable cleaning part 15 is driven to ascend; the microprocessor 24 sends an execution signal to the second stepping motor 28, and the second stepping motor 28 rotates to drive the cylinder 20 of the movable cleaning piece 15 to rotate, so that the second circumferential circular through hole 19 of the disc 18 of the movable cleaning piece 15 is aligned with the first circumferential circular through hole 10 on the bottom surface of the heat exchanger shell 1 and the third circumferential circular through hole 8 on the sealing gasket 16 to form a flow channel; simultaneously, the microprocessor 24 sends an execution command to the hydraulic pump 26, the hydraulic pump 26 is started, the cleaning solution bottle 27 conveys the cleaning solution contained in the cleaning solution bottle to flow through the first circumferential circular through hole 10 on the bottom surface of the heat exchanger shell 1 and the second circumferential circular through hole 19 of the movable cleaning piece 15 after passing through the hydraulic pump 26 so as to clean the lower-layer heat flow channel 11, and the impurity pollutants after cleaning flow out of the heat exchanger shell 1 along with the heat-setting waste gas outlet 6;
during cleaning, the microprocessor 24 continuously receives the temperature difference and pressure difference signals transmitted by the thermocouple 21 and the pressure sensor 22, compares the temperature difference and pressure difference signals with set standard values, and when the actual temperature difference value is greater than the maximum temperature difference standard value and the actual pressure difference value is less than the minimum pressure difference standard value, the microprocessor 24 sends a stop instruction to the hydraulic pump 26, so that the hydraulic pump 26 stops working; the microprocessor 24 sends an execution signal to the first stepping motor 25, the first stepping motor 25 rotates to drive the cylinder 20 of the movable cleaning piece 15 to rotate, and the second circumferential circular through hole 19 on the disc 18 of the movable cleaning piece 15 is staggered with the first circumferential circular through hole 10 on the bottom surface of the heat exchanger shell 1 to form a flow channel; meanwhile, the microprocessor 24 sends an execution signal to the second stepping motor 28, the second stepping motor 28 rotates, the fixed nut 17 is screwed, the cylinder 20 of the movable cleaning piece 15 is driven to descend, and the disc 18 of the movable cleaning piece 15 is tightly pressed with the bottom surface of the heat exchanger shell 1, so that sealing is realized. At this time, the heat exchanger is not subjected to cleaning operation.
First, the automatic cleaning structure is added in the heat exchanger, and the heat transfer efficiency of the heat exchanger can be effectively improved by monitoring and cleaning the heat setting waste gas flow passage, so that the blocking degree of the heat setting waste gas to the lower-layer heat flow passage is reduced. Secondly, the automatic cleaning method for automatically cleaning the non-uniform heat pipe heat exchanger by recovering the waste heat of the printing and dyeing heat setting waste gas can realize the automatic cleaning of the heat exchanger. This saves much time for manual disassembly and cleaning operations. Therefore, the working efficiency of the heat exchanger can be effectively improved by the arrangement of the automatic cleaning structure, and the enterprise cost is reduced. And the heat pipes of the embodiment are distributed in a non-uniform array structure. Through improving the heat pipe distribution, the contact of the heat exchange fluid and the heat pipe is more sufficient and uniform, and the heat exchange efficiency is further improved.
Claims (7)
1. The utility model provides a waste gas waste heat recovery self-cleaning non-equipartition heat pipe exchanger which characterized in that: the heat pipe heat exchanger comprises a heat exchanger shell (1), wherein a heat pipe heat exchange part (2) and an automatic cleaning assembly (3) are arranged in the heat exchanger shell (1); wherein:
the heat pipe heat exchange component (2) is arranged in the heat exchanger shell (1) and divides the interior of the heat exchanger shell (1) into a lower layer heat flow channel (11) and an upper layer cold flow channel (12) which are not mixed with each other; the heat pipe heat exchange component (2) comprises a middle partition plate (14), through holes distributed in a non-uniform array structure are formed in the middle partition plate (14), heat pipes (13) distributed in the non-uniform array structure are vertically inserted into the through holes distributed in the non-uniform array structure, and the middle partition plate (14) is divided into an evaporation section located in a lower-layer hot flow channel (11) and a condensation section located in an upper-layer cold flow channel (12):
two side walls of the heat exchanger shell (1) positioned at the position of the lower-layer heat flow channel (11) are respectively provided with a heat setting waste gas inlet (4) and a heat setting waste gas outlet (6), and the heat setting waste gas inlet (4) and the heat setting waste gas outlet (6) are coaxially arranged; a fresh air inlet (5) and a fresh air outlet (7) are respectively formed in two side walls of the heat exchanger shell (1) positioned at the upper cold flow channel (12), and the fresh air inlet (5) and the fresh air outlet (7) are coaxially formed; the heat setting waste gas inlet (4) and the fresh air inlet (5) are positioned on the same side of the heat exchanger shell (1), and the heat setting waste gas outlet (6) and the fresh air outlet (7) are positioned on the same side of the heat exchanger shell (1); a circular groove is formed in the center of the inner bottom surface of the heat exchanger shell (1), and a central circular through hole (9) is formed in the center of the circular groove; a first circumferential circular through hole (10) is uniformly distributed on the circular groove at the outer side of the central circular through hole (9); an automatic cleaning assembly (3) is arranged on a circular groove on the inner bottom surface of the heat exchanger shell (1); the automatic cleaning component (3) comprises a movable cleaning part (15), a sealing gasket (16) and a fixing nut (17); the movable cleaning piece (15) comprises a disc (18) assembled on the circular groove, and second circumferential circular through holes (19) corresponding to the first circumferential circular through holes (10) in position are uniformly distributed on the disc (18); a cylinder (20) which is flexibly connected with an output shaft of a first stepping motor (25) and can penetrate through a central circular through hole (9) is installed in the center of the disc (18), threads are machined on the outer surface of the cylinder (20), a fixing nut (17) is connected with the outer surface of the cylinder (20) in a threaded manner, and the fixing nut (17) is also connected with an output shaft of a second stepping motor (28); a sealing gasket (16) is arranged between the circular groove and the disc (18), and a through hole for the cylinder (20) to pass through is formed in the center of the sealing gasket (16); and third circumferential circular through holes (8) corresponding to the first circumferential circular through holes (10) are uniformly distributed on the sealing gasket (16).
2. The waste gas waste heat recovery self-cleaning non-uniform heat pipe heat exchanger as claimed in claim 1, characterized in that: the diameter of a central circular through hole (9) in the center of the bottom surface of the heat exchanger shell (1) is larger than that of the first circumferential circular through hole (10).
3. The waste gas waste heat recovery self-cleaning non-uniform heat pipe heat exchanger as claimed in claim 1, characterized in that: the diameter of a disc (18) of the movable cleaning piece (15) is smaller than that of a circular groove in the bottom surface of the heat exchanger shell (1), and the height of the disc (18) is smaller than the depth of the circular groove in the bottom surface of the heat exchanger shell (1); the diameter of the cylinder (20) is smaller than that of the central circular through hole (9) in the bottom surface of the heat exchanger shell (1), and the length of the cylinder (20) is larger than the depth of the central circular through hole (9) in the circular groove in the bottom surface of the heat exchanger shell (1).
4. The waste gas waste heat recovery self-cleaning non-uniform heat pipe heat exchanger as claimed in claim 1, characterized in that: the hole diameter of a first circumferential circular through hole (10) on a circular groove in the center of the bottom surface of the heat exchanger shell (1) is the same as the hole diameter of a second circumferential circular through hole (19) on a disc (18) of the movable cleaning piece (15) and the hole diameter of a third circumferential circular through hole (8) on the sealing gasket (16).
5. The waste gas waste heat recovery self-cleaning non-uniform heat pipe heat exchanger of claim 1, characterized in that: the heat exchanger shell (1) is connected with the middle partition plate (14) in a welding mode; and the heat exchanger shell (1) is an aluminum alloy heat exchanger shell.
6. The waste gas waste heat recovery self-cleaning non-uniform heat pipe heat exchanger as claimed in claim 1, characterized in that: a thermocouple (21) and a pressure sensor (22) are respectively arranged at the heat setting waste gas inlet (4), the fresh air inlet (5), the heat setting waste gas outlet (6) and the fresh air outlet (7); the pressure sensor (22) and the thermocouple (21) are respectively connected with a signal processing device (23), the signal processing device (23) is connected with a microprocessor (24), and the microprocessor (24) is respectively connected with a first stepping motor (25), a second stepping motor (28) and a hydraulic pump (26) through the signal processing device (23); the first stepping motor (25) is connected with the cylinder (20) of the movable cleaning piece (15); the second stepping motor (28) is connected with the fixing nut (17): the hydraulic pump (26) is connected with a cleaning solution bottle (27).
7. The automatic cleaning method for the waste gas waste heat recovery automatic cleaning of the non-uniform heat pipe heat exchanger is characterized by comprising a heat exchanger shell (1), wherein a heat pipe heat exchange part (2) and an automatic cleaning assembly (3) are installed in the heat exchanger shell (1); wherein:
the heat pipe heat exchange component (2) is arranged in the heat exchanger shell (1) and divides the interior of the heat exchanger shell (1) into a lower-layer heat flow channel (11) and an upper-layer cold flow channel (12) which are not mixed with each other; the heat pipe heat exchange component (2) comprises a middle partition plate (14), through holes distributed in a non-uniform array structure are formed in the middle partition plate (14), heat pipes (13) distributed in a non-uniform array structure are vertically inserted into the through holes distributed in the non-uniform array structure, and the middle partition plate (14) separates an evaporation section located in a lower-layer hot flow channel (11) and a condensation section located in an upper-layer cold flow channel (12):
two side walls of the heat exchanger shell (1) positioned at the position of the lower-layer heat flow channel (11) are respectively provided with a heat setting waste gas inlet (4) and a heat setting waste gas outlet (6), and the heat setting waste gas inlet (4) and the heat setting waste gas outlet (6) are coaxially arranged; a fresh air inlet (5) and a fresh air outlet (7) are respectively formed in two side walls of the heat exchanger shell (1) positioned at the upper cold flow channel (12), and the fresh air inlet (5) and the fresh air outlet (7) are coaxially formed; the heat setting waste gas inlet (4) and the fresh air inlet (5) are positioned on the same side of the heat exchanger shell (1), and the heat setting waste gas outlet (6) and the fresh air outlet (7) are positioned on the same side of the heat exchanger shell (1); a circular groove is formed in the center of the inner bottom surface of the heat exchanger shell (1), and a central circular through hole (9) is formed in the center of the circular groove; a first circumferential circular through hole (10) is uniformly distributed on the circular groove at the outer side of the central circular through hole (9); an automatic cleaning assembly (3) is arranged on a circular groove on the inner bottom surface of the heat exchanger shell (1); the automatic cleaning component (3) comprises a movable cleaning part (15), a sealing gasket (16) and a fixing nut (17); the movable cleaning piece (15) comprises a disc (18) assembled on the circular groove, and second circumferential circular through holes (19) corresponding to the first circumferential circular through holes (10) in position are uniformly distributed on the disc (18); a cylinder (20) which is flexibly connected with an output shaft of a first stepping motor (25) and can penetrate through a central circular through hole (9) is installed in the center of the disc (18), threads are machined on the outer surface of the cylinder (20), a fixing nut (17) is connected with the outer surface of the cylinder (20) in a threaded manner, and the fixing nut (17) is also connected with an output shaft of a second stepping motor (28); a sealing gasket (16) is arranged between the circular groove and the disc (18), and a through hole for the cylinder (20) to pass through is formed in the center of the sealing gasket (16); third circumferential circular through holes (8) corresponding to the first circumferential circular through holes (10) are uniformly distributed in the sealing gasket (16), and thermocouples (21) and pressure sensors (22) are respectively arranged at the heat setting waste gas inlet (4), the fresh air inlet (5), the heat setting waste gas outlet (6) and the fresh air outlet (7); the pressure sensor (22) and the thermocouple (21) are respectively connected with a signal processing device (23), the signal processing device (23) is connected with a microprocessor (24), and the microprocessor (24) is respectively connected with a first stepping motor (25), a second stepping motor (28) and a hydraulic pump (26) through the signal processing device (23); the first stepping motor (25) is connected with the cylinder (20) of the movable cleaning piece (15); the second stepping motor (28) is connected with the fixing nut (17): the hydraulic pump (26) is connected with a cleaning solution bottle (27);
the method comprises the following steps: before the heat exchanger starts to work, the positions of a second circumferential circular through hole (19) on a disc (18) of the movable cleaning piece (15) and a first circumferential circular through hole (10) on the bottom surface of the heat exchanger shell (1) are staggered, so that a flow channel cannot be formed; the fixed nut (17) is initially matched with threads on the outer surface of the cylinder (20) and screwed on the bottom surface of the heat exchanger shell (1) to tightly press the disc (18) of the movable cleaning piece (15) with the bottom surface of the heat exchanger shell (1) so as to realize sealing under the working state that cleaning is not required; when the heat exchanger works, the thermocouple (21) is adopted to respectively measure the temperature difference between the heat setting waste gas inlet (4) and the heat setting waste gas outlet (6) and the temperature difference between the fresh air inlet (5) and the fresh air outlet (7); the pressure sensors (22) are adopted to respectively measure the pressure difference between the heat setting waste gas inlet (4) and the heat setting waste gas outlet (6) and the pressure difference between the fresh air inlet (5) and the fresh air outlet (7), and the pressure difference signals and the temperature difference signals are transmitted to the microprocessor (24); after the microprocessor (24) obtains the temperature difference and pressure difference signals, the temperature difference and pressure difference signals are calculated and processed, and are compared and analyzed with a preset temperature difference standard value and a preset pressure difference standard value; when the actual temperature difference value is smaller than the minimum temperature difference standard value or the actual pressure difference value is larger than the maximum pressure difference standard value, the microprocessor (24) sends an execution signal to the second stepping motor (28), the second stepping motor (28) rotates, the fixing nut (17) is unscrewed, and the cylinder (20) of the movable cleaning piece (15) is driven to ascend; the microprocessor (24) sends an execution signal to the second stepping motor (28), the second stepping motor (28) rotates to drive the cylinder (20) of the movable cleaning piece (15) to rotate, and the second circumferential circular through hole (19) of the disc (18) of the movable cleaning piece (15) is aligned with the first circumferential circular through hole (10) on the bottom surface of the heat exchanger shell (1) and the third circumferential circular through hole (8) on the sealing gasket (16) to form a flow channel; meanwhile, the microprocessor (24) sends an execution command to the hydraulic pump (26), the hydraulic pump (26) is started, a cleaning solution bottle (27) conveys cleaning solution contained in the cleaning solution bottle to flow through a first circumferential circular through hole (10) on the bottom surface of the heat exchanger shell (1) and a second circumferential circular through hole (19) of the movable cleaning piece (15) after passing through the hydraulic pump (26) and then cleans a lower-layer heat flow channel (11), and impurity pollutants after cleaning flow out of the heat exchanger shell (1) along with the heat setting waste gas outlet (6); during cleaning, the microprocessor (24) continuously receives temperature difference and pressure difference signals transmitted by the thermocouple (21) and the pressure sensor (22) and compares the temperature difference and the pressure difference signals with set standard values, and when the actual temperature difference value is larger than the maximum temperature difference standard value and the actual pressure difference value is smaller than the minimum pressure difference standard value, the microprocessor (24) sends a stop instruction to the hydraulic pump (26), so that the hydraulic pump (26) stops working; the microprocessor (24) sends an execution signal to the first stepping motor (25), the first stepping motor (25) rotates to drive the cylinder (20) of the movable cleaning piece (15) to rotate, and the second circumferential circular through hole (19) on the disc (18) of the movable cleaning piece (15) is staggered with the first circumferential circular through hole (10) on the bottom surface of the heat exchanger shell (1) to form a flow channel; meanwhile, the microprocessor (24) sends an execution signal to the second stepping motor (28), the second stepping motor (28) rotates, the fixed nut (17) is screwed, the cylinder (20) of the movable cleaning piece (15) is driven to descend, and the disc (18) of the movable cleaning piece (15) is tightly pressed with the bottom surface of the heat exchanger shell (1) to realize sealing.
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| CN108562183B (en) * | 2018-04-26 | 2020-12-15 | 菏泽昌盛源科技股份有限公司 | Active circulation type chemical heat exchanger |
| CN110186316B (en) * | 2019-05-07 | 2024-02-20 | 浙江理工大学 | Automatic cleaning device and method for heat-setting waste gas and waste heat recovery heat exchanger |
| CN113701550B (en) * | 2021-08-19 | 2022-07-19 | 武汉理工大学 | Automatic cleaning device and method suitable for diffusion welding hybrid heat exchanger |
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| BE791086A (en) * | 1971-11-16 | 1973-03-01 | Danfoss As | CONTROL UNIT FOR HYDROSTATIC OR HYDRAULIC SYSTEMS |
| CN201191163Y (en) * | 2007-11-29 | 2009-02-04 | 沈志梁 | On-line cleaning device for heat exchanger |
| CN201583189U (en) * | 2009-11-30 | 2010-09-15 | 王明峰 | Automatic online cleaning device of condenser |
| DE102011082062A1 (en) * | 2011-09-02 | 2013-03-07 | BSH Bosch und Siemens Hausgeräte GmbH | Valve device, in particular for a refrigerating machine |
| KR20140045760A (en) * | 2012-10-09 | 2014-04-17 | 삼성전자주식회사 | Apparatus for change water flow path used for washing machine |
| CN203730801U (en) * | 2014-03-16 | 2014-07-23 | 吉林大学 | Self-cleaning water economizer |
| CN204739943U (en) * | 2015-06-24 | 2015-11-04 | 江苏瓯堡纺织染整有限公司 | Forming machine waste heat recovery device |
| CN206143468U (en) * | 2016-08-31 | 2017-05-03 | 河北新大东纺织有限公司 | Forming machine heat recovery system |
| CN207231305U (en) * | 2017-08-21 | 2018-04-13 | 浙江理工大学 | Non- uniformly distributed heat exchange of heat pipe is cleaned in waste gas residual heat recycling automatically |
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