CN113701550A - Automatic cleaning device and method suitable for diffusion welding hybrid heat exchanger - Google Patents
Automatic cleaning device and method suitable for diffusion welding hybrid heat exchanger Download PDFInfo
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- CN113701550A CN113701550A CN202110953848.6A CN202110953848A CN113701550A CN 113701550 A CN113701550 A CN 113701550A CN 202110953848 A CN202110953848 A CN 202110953848A CN 113701550 A CN113701550 A CN 113701550A
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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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- 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
- F28G15/02—Supports for cleaning appliances, e.g. frames
Abstract
The invention relates to an automatic cleaning device suitable for a diffusion welding hybrid heat exchanger.A monitoring module for inlet and outlet state parameters of cold and hot fluid of the heat exchanger comprises a monitoring device for physical parameters of flue gas hot fluid of a fin channel and an S-CO of an etching channel2A device for monitoring physical property parameters of the cold fluid; the analysis control module comprises an efficiency analysis module of the heat exchanger and a mechanical cleaning control module of the mechanical cleaning device; each sensor of the inlet and outlet state parameter monitoring module transmits a measured signal to the efficiency analysis module for processing, and the efficiency analysis module evaluates the operation efficiency of the heat exchanger according to the operation state parameter so as to judge whether the heat exchanger needs to be cleaned; and the mechanical cleaning control module controls the mechanical cleaning device to finish automatic cleaning according to the instruction of the efficiency analysis module. The invention can be changed according toThe running state of the heat exchanger judges whether to carry out cleaning, and the cleaning of the heat exchanger is finished in the end socket of the heat exchanger without disassembling the heat exchanger.
Description
Technical Field
The invention belongs to the technical field of heat exchanger cleaning, and particularly relates to an automatic cleaning device and method for a hybrid heat exchanger with fins and etching plates in diffusion welding.
Background
The excellent characteristics of the supercritical carbon dioxide brayton cycle power generation system and the potential subversion of power generation technology have been increasingly recognized, and the speed of technological development and commercial application thereof is also gradually accelerated. The supercritical carbon dioxide Brayton cycle power generation system has wide prospect in the recovery of the waste heat of the heat engine of the ship. Due to the limitation of the use environment, the heat exchanger for exchanging heat between the waste heat flue gas of the ship heat engine and the supercritical carbon dioxide cannot adopt a traditional shell-and-tube heat exchanger or a printed circuit plate heat exchanger, and the hybrid heat exchanger formed by diffusion welding the fins and the etching plate can meet the requirements of high-pressure use environment, high-efficiency heat exchange and compactness.
The exhaust gas of the heat engine of the ship contains common gases such as nitrogen, carbon dioxide, oxygen, water vapor and the like, and also contains hydrocarbons, sulfides, particulate matters and the like. These fouls can adhere to the heat transfer surfaces of the formed fins, reducing the heat exchange capacity of the heat exchanger and reducing the effectiveness of the heat exchanger. At present, the cleaning method for the hybrid heat exchanger generally adopts cleaning after disassembly, and has the disadvantages of complex operation and low efficiency.
Disclosure of Invention
The invention aims to solve the technical problems that the hybrid heat exchanger is difficult to clean and low in efficiency, and provides an automatic cleaning device and method suitable for a diffusion welding hybrid heat exchanger, which can automatically clean a fin channel of the heat exchanger on the premise of no disassembly.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the automatic cleaning device comprises an inlet and an outlet of cold and hot fluid of the heat exchangerThe system comprises a state parameter monitoring module, an analysis control module of a master control computer and a mechanical cleaning device of the hybrid heat exchanger; the inlet and outlet state parameter monitoring module comprises a monitoring device for physical parameters of flue gas hot fluid of the fin channel and S-CO of the etching channel2A device for monitoring physical property parameters of the cold fluid; the analysis control module comprises an efficiency analysis module of the heat exchanger and a mechanical cleaning control module of the mechanical cleaning device;
the mechanical cleaning device comprises a cleaning machine, a lifting device, a fin positioning device, a local sealing device and a cleaning liquid circulator, wherein the cleaning machine, the lifting device, the fin positioning device and the local sealing device are positioned inside the heat exchanger end socket; the cleaning machine, the lifting device, the fin positioning device and the local sealing device are respectively provided with one set in an inlet end socket and an outlet end socket of the fin channel, wherein the lifting device is vertically arranged between an upper end side plate and a lower end side plate of the heat exchanger; a liquid outlet and a liquid return port of the cleaning liquid circulator are respectively communicated with cleaning machines in end sockets at two ends of the fin channel through pipelines, cleaning liquid enters the cleaning machines from the cleaning liquid circulator through the end sockets, flows out of the end sockets from the cleaning machine at the other side after cleaning is finished, and is cleaned in a circulating and reciprocating manner;
each sensor of the inlet and outlet state parameter monitoring module is connected with an efficiency analysis module of the analysis control module, measured signals are transmitted to the efficiency analysis module to be processed, and the efficiency analysis module evaluates the operation efficiency of the heat exchanger according to the operation state parameters so as to judge whether the heat exchanger needs to be cleaned or not; the mechanical cleaning device is connected with the mechanical cleaning control module, and the mechanical cleaning control module controls the mechanical cleaning device to complete automatic cleaning according to the instruction of the efficiency analysis module.
In the above scheme, the cleaning machine comprises an internal liquid storage tank and a cleaning liquid nozzle, the internal liquid storage tank is communicated with the cleaning liquid circulator through a pipeline, the cleaning liquid in the internal liquid storage tank is sprayed to the fin channel through the cleaning liquid nozzle, and after the fin channel is cleaned, the cleaning liquid returns to the cleaning liquid circulator through the cleaning machine on the other side.
In the above scheme, the lifting device comprises two groups of transmission mechanisms respectively arranged at two sides of the cleaning machine, each group of transmission mechanisms comprises a bracket arranged on a side plate at the lower end of the heat exchanger, a lower end chain wheel and a driving motor thereof arranged on the bracket, an upper end chain wheel arranged on a side plate at the upper end of the heat exchanger and a transmission chain arranged between the two chain wheels; two sides of the cleaning machine are provided with gear structures matched with the transmission chain, and the integral lifting motion is realized under the driving of the transmission chain; the relative positions of the cleaning machines on the two sides of the fin channel are always kept consistent.
In the above scheme, the fin positioning device is an electrically driven positioner, two positioning points are arranged on each layer of fin channel, and when the electrically driven positioner moves to the positioning points, the mechanical cleaning control module controls the lifting device to stop operating according to signals of the electrically driven positioner, so that the cleaning machine is fixed at an inlet of the fin channel to be cleaned.
In the scheme, the local sealing device is a movable dynamic sealing device, when the cleaning machine is positioned at the fin channel, the movable dynamic sealing device starts to seal, and after cleaning is finished, sealing is stopped.
In the above scheme, the device for monitoring physical parameters of the flue gas thermal fluid comprises two groups of flow sensors, temperature sensors and pressure sensors which are respectively arranged at a flue gas inlet and a flue gas outlet of the hybrid heat exchanger, and is used for monitoring the flow, temperature and pressure of the inlet and the outlet of the thermal fluid; the S-CO2The device for monitoring physical parameters of cold fluid comprises S-CO respectively arranged on the mixed heat exchanger2Import, S-CO2And the two groups of flow sensors, temperature sensors and pressure sensors at the outlet monitor the flow, temperature and pressure of the inlet and the outlet of the cold fluid.
Correspondingly, the invention also provides an automatic cleaning method suitable for the diffusion welding hybrid heat exchanger, which adopts the device for cleaning and comprises the following steps:
s1, monitoring the physical parameters of the flue gas hot fluid in the fin channel and the S-CO in the etching channel through the inlet and outlet state parameter monitoring module2Cold fluid physical parameters, wherein the physical parameters comprise flow, temperature and pressure of the fluid;
s2, the efficiency analysis module processes the signals of the sensor into required data, and the theoretical heat transfer coefficient of the heat exchanger is obtained by analyzing the inlet flow, the temperature and the pressure state of the cold and hot fluid of the heat exchanger; then analyzing the inlet and outlet states of cold and hot fluid of the heat exchanger to obtain the actual heat transfer coefficient of the heat exchanger, and further obtaining the actual efficiency of the heat exchanger; when the actual efficiency of the heat exchanger is lower than the preset efficiency, stopping the entry of flue gas hot fluid of the heat exchanger, and controlling the mechanical cleaning device to carry out cleaning work through the mechanical cleaning control module;
s3, after the mechanical cleaning device receives a cleaning instruction, firstly, finding the position of the fin to be cleaned through the lifting device and the fin positioning device, sealing, and isolating the external environment of the fin channel to be cleaned; then, the cleaning liquid is sprayed out from a nozzle of the inlet end cleaning machine, passes through the fin channel and is cleaned, returns to the outlet end cleaning machine after cleaning is finished, and is blown empty through the cleaning machine;
s4, adjusting the cleaning machine to the position of the next group of fin channels through the lifting device and the fin positioning device, and cleaning the fin channels according to the mode of S3; until the cleaning of all fin channels is completed; and the cleaning and blowing time is adjusted by the mechanical cleaning control module in the cleaning process, so that the cleaning effect is ensured.
In the above method, in step S2, the theoretical heat transfer coefficient of the hybrid heat exchanger is calculated by the following formula:
wherein, K1Theoretical heat transfer coefficient (based on fin side) h of the hybrid heat exchanger1Is the convective heat transfer coefficient, h, of the fin channel2For convective heat transfer coefficient of etched channels, A1Is the heat exchange area of the fin channel, A2The heat exchange area of the etching channel is delta is the metal wall thickness, and lambda is the heat conductivity coefficient of the metal;
in the formula (1), h1And h2Are all calculated by the following formula:
wherein h is the convective heat transfer coefficient, Nu is the Nu, K is the thermal conductivity of the stationary fluid, and D is the hydraulic diameter;
in the formula (2), Nu is calculated by the following formula:
Nu＝aRebPrc (3)
wherein, Re is Reynolds number, which can be calculated by the inlet state of the fluid and the structure of the flow channel; pr is a Plantt number, which can be found from the fluid state; the coefficients a, b and c are constant values and can be obtained by searching a heat transfer relational expression.
In the above method, in step S2, the method for calculating the actual heat transfer coefficient of the hybrid heat exchanger is as follows:
1) actual heat transfer capacity of hybrid heat exchanger
Q1＝m1(h1,i-h1,o)
Q2＝m2(h2,o-h2,i)
Wherein Q is1Is the heat release of the fluid in the fin, Qx is the heat absorption of the fluid in the etched plate, QaveM is the heat transfer capacity of the cold and hot fluid1Is the mass flow rate, m, of the fluid in the finned passage2For the mass flow of the fluid in the etching channel, h1,i、h1,oInlet and outlet enthalpy values, h, of the finned passage fluid, respectively2,i、h2,oRespectively is an inlet enthalpy value and an outlet enthalpy value of etching channel fluid;
2) actual heat transfer coefficient of hybrid heat exchanger
Wherein, K0Is the actual total heat transfer coefficient of the hybrid heat exchanger; a. the1Is the heat exchange area of the fin channel; delta TLMTDFor the logarithmic mean temperature difference, the following formula was used:
wherein, Th,iIs the fin side inlet temperature, Th,oIs fin side outlet temperature, Tc,iFor the side inlet temperature of the etching plate, Tc,oIs the etch plate side exit temperature.
In the above method, in step S2, the actual performance of the hybrid heat exchanger is calculated by the following formula:
when eta is more than or equal to 0 and less than or equal to 0.8, judging that the heat exchanger needs to be cleaned; when eta is more than 0.8 and less than or equal to 1, the heat exchanger is judged not to need to be cleaned.
The invention has the beneficial effects that:
1. the invention provides a set of complete automatic cleaning device and method applied to a hybrid heat exchanger, which can judge whether to carry out cleaning according to the running state of the heat exchanger. And the cleaning of the heat exchanger is finished in the end socket of the heat exchanger, the heat exchanger does not need to be disassembled, the manual complex operation is reduced, and the hybrid heat exchanger can run efficiently.
2. The invention can accurately and effectively collect the state parameters of the inlet and the outlet of the cold and hot fluid of the heat exchanger, evaluate the operation efficiency of the heat exchanger based on the operation state parameters and judge whether the heat exchanger needs to clean the dirt in the flow passage. And the mechanical cleaning part of the heat exchanger is connected with a cleaning instruction of a master control computer, and then can accurately position the fin channel of the heat exchanger through the lifting device and the fin positioning device, and perform local sealing and fin cleaning. And after the group of runners is cleaned, cleaning the next group of runners. When the exhaust gas of some marine main engines is more (burning heavy oil and residual oil), the mechanical cleaning part of the heat exchanger can also increase the time for cleaning each layer of flow channel and the injection amount of cleaning liquid, so that the efficiency of the heat exchanger is always above the preset efficiency.
3. The internal flow channels of the fins are chemically cleaned, the cleaning solution adopts self-circulation, the cleaning is carried out blow-out treatment, the cleaning solution cannot enter the fluid in the fins, and the pollution to the environment is small.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of the overall structure of an automatic cleaning device for a diffusion welding hybrid heat exchanger according to the present invention;
fig. 2 is a schematic view of the mechanical cleaning apparatus of the automatic cleaning apparatus shown in fig. 1 assembled at an inlet.
In the figure: 10. a mechanical cleaning device; 11. a cleaning machine; 111. an internal reservoir; 112. a cleaning fluid spout; 12. a lifting device; 121. a support; 122. a sprocket; 123. a drive chain; 13. a fin positioning device; 14. a local sealing device; 15. a cleaning liquid circulator;
200. a heat exchanger; 201. a fin; 202. etching; 203. a partition plate; 204. sealing the end; 205. a side plate; 206. and positioning points.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in order to provide an automatic cleaning device for a diffusion welding hybrid heat exchanger according to an embodiment of the present invention, a heat exchange flow channel of the diffusion welding hybrid heat exchanger 200 includes a channel of a fin 201 and an etching channel202 channel and the automatic cleaning device comprises an inlet and outlet state parameter monitoring module of cold and hot fluid of the heat exchanger, an analysis control module of a main control computer and a mechanical cleaning device 10 of the hybrid heat exchanger. The inlet and outlet state parameter monitoring module comprises a monitoring device for physical property parameters of flue gas hot fluid of the fin channel and S-CO of the etching channel2A device for monitoring physical property parameters of cold fluid. The analytical control module includes a performance analysis module for the heat exchanger and a mechanical cleaning control module for the mechanical cleaning device 10.
As shown in fig. 2, the mechanical cleaning device 10 includes a cleaning machine 11 located inside the heat exchanger head, a lifting device 12, a fin positioning device 13, a partial sealing device 14, and a cleaning liquid circulator 15 located outside the heat exchanger head. The cleaning machine 11, the lifting device 12, the fin positioning device 13 and the local sealing device 14 are respectively provided with one set in an inlet and outlet end enclosure 204 of the fin channel, wherein the lifting device 12 is vertically installed between an upper end side plate 205 and a lower end side plate 205 of the heat exchanger, the cleaning machine 11 is installed on the lifting device 12 and can move up and down along the lifting device 12, the local sealing device 14 is installed on the cleaning machine 11, the local sealing device 14 is designed to be matched with the section of a single fin channel, and the fin positioning device 13 is installed on the cleaning machine 11. And a liquid outlet and a liquid return port of the cleaning liquid circulator 15 are respectively communicated with the cleaning machines 11 in the seal heads at two ends of the fin channel through pipelines, cleaning liquid enters the cleaning machines 11 from the cleaning liquid circulator 15 through the seal heads, and flows out of the seal heads from the cleaning machine 11 at the other side after cleaning is finished, so that the cleaning is performed in a circulating and reciprocating manner.
And each sensor of the inlet and outlet state parameter monitoring module is connected with the efficiency analysis module of the analysis control module, and transmits the measured signal to the efficiency analysis module for processing. The mechanical cleaning device 10 is connected with a mechanical cleaning control module, and automatic cleaning is realized through the mechanical cleaning control module. The mechanical cleaning control module completes intelligent control of cleaning through control over the fin positioning device 13 and the cleaning machine 11, wherein the intelligent control comprises the sequence of cleaning the flow channels, the time for cleaning each group of fin flow channels, the flow of cleaning liquid for cleaning each group of fin flow channels and the like.
Further preferably, in this embodiment, the cleaning machine 11 is used for completing the spraying and recycling of the cleaning liquid, and includes an internal liquid storage tank 111 and a cleaning liquid nozzle 112, etc., the internal liquid storage tank 111 is communicated with the cleaning liquid circulator 15 through a pipeline, the cleaning liquid in the internal liquid storage tank 111 is sprayed to the fin channel through the cleaning liquid nozzle 112, and after the fin channel is cleaned, the cleaning liquid returns to the cleaning liquid circulator 15 through the cleaning machine 11 on the other side.
Preferably, in this embodiment, the lifting device 12 includes two sets of transmission mechanisms respectively disposed on two sides of the cleaning machine 11, each set of transmission mechanism includes a bracket 121 mounted on a lower end side plate of the heat exchanger, a lower end sprocket 122 mounted on the bracket 121 and a driving motor (not shown) thereof, an upper end sprocket 122 mounted on an upper end side plate of the heat exchanger, and a transmission chain 123 mounted between the two sprockets 122. The two sides of the cleaning machine 11 are gear structures matched with the transmission chain 123, and the whole lifting motion is realized under the driving of the transmission chain 123. The relative positions of the washers 11 on both sides of the fin channel are always kept consistent.
Further preferably, in this embodiment, the fin positioning device 13 is an electrically driven positioner, and is used for positioning the fin flow channel to be cleaned. Two positioning points 206 are arranged on each layer of fin channel, and when the electric driving positioner moves to the positioning points 206, the mechanical cleaning control module controls the lifting device 12 to stop running according to signals of the electric driving positioner, so that the cleaning machine 11 is fixed at the inlet of the fin channel to be cleaned.
Further preferably, in this embodiment, the local sealing device 14 is a movable dynamic sealing device for isolating the flue gas hot fluid, so that the group of fin runners is connected to the nozzle of the cleaning machine. When the cleaning machine 11 is positioned at the fin channel, the movable dynamic sealing device starts to seal, and after cleaning is finished, sealing is stopped.
Further optimize, in this embodiment, the monitoring devices of flue gas hot-fluid physical properties parameter monitors flow, temperature, pressure of the exit of hot-fluid including installing respectively in two sets of flow sensor, temperature sensor, the pressure sensor of hybrid heat exchanger flue gas import, exhanst gas outlet. S-CO2The cold fluid physical property parameter monitoring device comprises a mixed heat exchangerS-CO2Import, S-CO2And the two groups of flow sensors, temperature sensors and pressure sensors at the outlet monitor the flow, temperature and pressure of the inlet and the outlet of the cold fluid.
Further preferably, in this embodiment, the main component of the cleaning solution is a mixture of an organic acid, a corrosion inhibitor, a surfactant and clean water.
Correspondingly, the invention also provides an automatic cleaning method suitable for the diffusion welding hybrid heat exchanger, which adopts the device for cleaning and comprises the following steps:
s1, monitoring physical parameters of flue gas hot fluid in fin channel and S-CO in etching channel through inlet and outlet state parameter monitoring module2And cold fluid physical parameters including flow, temperature and pressure of the fluid.
S2, the efficiency analysis module processes the signals of the sensor into required data, and the theoretical heat transfer coefficient of the heat exchanger is obtained by analyzing the inlet flow, the temperature and the pressure state of the cold and hot fluid of the heat exchanger. And then analyzing the inlet and outlet states of cold and hot fluid of the heat exchanger to obtain the actual heat transfer coefficient of the heat exchanger, and further obtaining the actual efficiency of the heat exchanger. When the actual efficiency of the heat exchanger is lower than the preset efficiency, the entering of the flue gas hot fluid of the heat exchanger is stopped, and the mechanical cleaning device 10 is controlled by the mechanical cleaning control module to carry out cleaning work.
Specifically, the theoretical heat transfer coefficient of the hybrid heat exchanger is calculated by the following formula:
wherein, K1Theoretical heat transfer coefficient (based on fin side) h of the hybrid heat exchanger1Is the convective heat transfer coefficient, h, of the fin channel2For convective heat transfer coefficient of etched channels, A1Is the heat exchange area of the fin channel, A2Delta is the metal wall thickness and lambda is the heat conductivity coefficient of the metal for the heat exchange area of the etching channel.
In the formula (1), h1And h2Are all calculated by the following formula:
wherein h is the convective heat transfer coefficient, Nu is the Nu, K is the thermal conductivity of the stationary fluid, and D is the hydraulic diameter.
In the formula (2), Nu is calculated by the following formula:
Nu＝aRebPrc (3)
where Re is the reynolds number, which can be calculated from the inlet state of the fluid and the structure of the flow channel. Pr is the Plantt number and can be found from the fluid state. The coefficients a, b and c are constant values and can be obtained by searching a heat transfer relational expression.
The actual heat transfer coefficient of the hybrid heat exchanger is calculated as follows:
1) actual heat transfer capacity of hybrid heat exchanger
Q1＝m1(h1,i-h1,o)
Q2＝m2(h2,o-h2,i)
Wherein Q is1Is the heat release of the fluid in the fin, Q2For heat absorption of the fluid in the etching plate, QaveM is the heat transfer capacity of the cold and hot fluid1Is the mass flow rate, m, of the fluid in the finned passage2For the mass flow of the fluid in the etching channel, h1,i、h1,oInlet and outlet enthalpy values, h, of the finned passage fluid, respectively2,i、h2,oRespectively, the inlet and outlet enthalpy values of the etching channel fluid.
2) Actual heat transfer coefficient of hybrid heat exchanger
Wherein, K0Is the actual total heat transfer coefficient of the hybrid heat exchanger; a. the1Is the heat exchange area of the fin channel; delta TLMTDFor the logarithmic mean temperature difference, the following formula was used:
wherein, Th,iIs the fin side inlet temperature, Th,oIs fin side outlet temperature, Tc,iFor the side inlet temperature of the etching plate, Tc,oIs the etch plate side exit temperature.
The actual performance of the hybrid heat exchanger is calculated using the following equation:
when eta is more than or equal to 0 and less than or equal to 0.8, judging that the heat exchanger needs to be cleaned; when eta is more than 0.8 and less than or equal to 1, the heat exchanger is judged not to need to be cleaned.
S3, after the mechanical cleaning device 10 receives a cleaning instruction, firstly, the lifting device 12 and the fin positioning device 13 are used for finding the position of the fin to be cleaned, and sealing is carried out to isolate the external environment of the fin channel to be cleaned. Then, the cleaning liquid is sprayed out from the nozzle of the inlet end cleaning machine 11, passes through the fin channel and is cleaned, and after cleaning is completed, the cleaning liquid returns to the outlet end cleaning machine 11 and is blown out through the cleaning machine 11, so that the cleaning liquid is blown completely.
And S4, adjusting the cleaning machine 11 to the position of the next group of fin channels through the lifting device 12 and the fin positioning device 13, and cleaning the fin channels according to the mode S3 until all the fin channels are cleaned. The cleaning and blowing time is adjusted by the mechanical cleaning control module in the cleaning process, so that the cleaning effect is ensured.
Further optimization, when the dirt of the flue gas hot fluid is more, a cleaning device can be arranged to carry out circular cleaning. The set parameters comprise the direction of cleaning the fin flow channels, the cleaning time for cleaning each group of fin flow channels, the injection amount of cleaning liquid and the like, and the cleaning effect of the heat exchanger is ensured.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An automatic cleaning device suitable for a diffusion welding hybrid heat exchanger is characterized by comprising an inlet and outlet state parameter monitoring module of cold and hot fluid of the heat exchanger, an analysis control module of a master control computer and a mechanical cleaning device of the hybrid heat exchanger;
the inlet and outlet state parameter monitoring module comprises a monitoring device for physical parameters of flue gas hot fluid of the fin channel and S-CO of the etching channel2A device for monitoring physical property parameters of the cold fluid;
the analysis control module comprises an efficiency analysis module of the heat exchanger and a mechanical cleaning control module of the mechanical cleaning device;
the mechanical cleaning device comprises a cleaning machine, a lifting device, a fin positioning device, a local sealing device and a cleaning liquid circulator, wherein the cleaning machine, the lifting device, the fin positioning device and the local sealing device are positioned inside the heat exchanger end socket; the cleaning machine, the lifting device, the fin positioning device and the local sealing device are respectively provided with one set in an inlet end socket and an outlet end socket of the fin channel, wherein the lifting device is vertically arranged between an upper end side plate and a lower end side plate of the heat exchanger; a liquid outlet and a liquid return port of the cleaning liquid circulator are respectively communicated with cleaning machines in end sockets at two ends of the fin channel through pipelines, cleaning liquid enters the cleaning machines from the cleaning liquid circulator through the end sockets, flows out of the end sockets from the cleaning machine at the other side after cleaning is finished, and is cleaned in a circulating and reciprocating manner;
each sensor of the inlet and outlet state parameter monitoring module is connected with an efficiency analysis module of the analysis control module, measured signals are transmitted to the efficiency analysis module to be processed, and the efficiency analysis module evaluates the operation efficiency of the heat exchanger according to the operation state parameters so as to judge whether the heat exchanger needs to be cleaned or not; the mechanical cleaning device is connected with the mechanical cleaning control module, and the mechanical cleaning control module controls the mechanical cleaning device to complete automatic cleaning according to the instruction of the efficiency analysis module.
2. The automatic cleaning device for a diffusion-welded hybrid heat exchanger as recited in claim 1, wherein the cleaning machine comprises an internal reservoir and a cleaning fluid nozzle, the internal reservoir is connected to the cleaning fluid circulator through a pipeline, the cleaning fluid in the internal reservoir is sprayed to the fin channel through the cleaning fluid nozzle, and after the fin channel is cleaned, the cleaning fluid is returned to the cleaning fluid circulator through the cleaning machine on the other side.
3. The automatic cleaning device for the diffusion welding hybrid heat exchanger as recited in claim 1, wherein the lifting device comprises two sets of transmission mechanisms respectively disposed at two sides of the cleaning machine, each set of transmission mechanism comprises a bracket mounted on a lower end side plate of the heat exchanger, a lower end chain wheel and a driving motor thereof mounted on the bracket, an upper end chain wheel mounted on an upper end side plate of the heat exchanger, and a transmission chain mounted between the two chain wheels; two sides of the cleaning machine are provided with gear structures matched with the transmission chain, and the integral lifting motion is realized under the driving of the transmission chain; the relative positions of the cleaning machines on the two sides of the fin channel are always kept consistent.
4. The automatic cleaning device for the diffusion welding hybrid heat exchanger as recited in claim 1, wherein the fin positioning device is an electrically driven positioner, two positioning points are arranged on each layer of fin channel, when the electrically driven positioner moves to the positioning points, the mechanical cleaning control module controls the lifting device to stop operating according to signals of the electrically driven positioner, so that the cleaning machine is fixed at an inlet of the fin channel to be cleaned.
5. The automatic cleaning device for a diffusion-welded hybrid heat exchanger as recited in claim 1, wherein said local sealing means is a moving dynamic sealing means, wherein the moving dynamic sealing means starts sealing when the cleaning machine is positioned at the fin passage, and the sealing stops after the cleaning is finished.
6. The automatic cleaning device for the diffusion welding hybrid heat exchanger as recited in claim 1, wherein the monitoring device for the physical parameters of the hot fluid in the flue gas comprises two sets of flow sensors, temperature sensors and pressure sensors which are respectively installed at a flue gas inlet and a flue gas outlet of the hybrid heat exchanger, and is used for monitoring the flow, the temperature and the pressure of the inlet and the outlet of the hot fluid; the S-CO2The device for monitoring physical parameters of cold fluid comprises S-CO respectively arranged on the mixed heat exchanger2Import, S-CO2And the two groups of flow sensors, temperature sensors and pressure sensors at the outlet monitor the flow, temperature and pressure of the inlet and the outlet of the cold fluid.
7. An automatic cleaning method for a diffusion welded hybrid heat exchanger, characterized in that the cleaning is performed by using the device of any one of claims 1-6, comprising the following steps:
s1, monitoring the physical parameters of the flue gas hot fluid in the fin channel through the inlet and outlet state parameter monitoring moduleNumber and etch channel S-CO2Cold fluid physical parameters, wherein the physical parameters comprise flow, temperature and pressure of the fluid;
s2, the efficiency analysis module processes the signals of the sensor into required data, and the theoretical heat transfer coefficient of the heat exchanger is obtained by analyzing the inlet flow, the temperature and the pressure state of the cold and hot fluid of the heat exchanger; then analyzing the inlet and outlet states of cold and hot fluid of the heat exchanger to obtain the actual heat transfer coefficient of the heat exchanger, and further obtaining the actual efficiency of the heat exchanger; when the actual efficiency of the heat exchanger is lower than the preset efficiency, stopping the entry of flue gas hot fluid of the heat exchanger, and controlling the mechanical cleaning device to carry out cleaning work through the mechanical cleaning control module;
s3, after the mechanical cleaning device receives a cleaning instruction, firstly, finding the position of the fin to be cleaned through the lifting device and the fin positioning device, sealing, and isolating the external environment of the fin channel to be cleaned; then, the cleaning liquid is sprayed out from a nozzle of the inlet end cleaning machine, passes through the fin channel and is cleaned, returns to the outlet end cleaning machine after cleaning is finished, and is blown empty through the cleaning machine;
s4, adjusting the cleaning machine to the position of the next group of fin channels through the lifting device and the fin positioning device, and cleaning the fin channels according to the mode of S3; until the cleaning of all fin channels is completed; and the cleaning and blowing time is adjusted by the mechanical cleaning control module in the cleaning process, so that the cleaning effect is ensured.
8. The automatic cleaning method for a diffusion-welded hybrid heat exchanger as recited in claim 7, wherein in step S2, the theoretical heat transfer coefficient of the hybrid heat exchanger is calculated by the following formula:
wherein, K1Theoretical heat transfer coefficient (based on fin side) h of the hybrid heat exchanger1Is the convective heat transfer coefficient, h, of the fin channel2For convective heat transfer coefficient of etched channels, A1Is the heat exchange area of the fin channel, A2The heat exchange area of the etching channel is delta is the metal wall thickness, and lambda is the heat conductivity coefficient of the metal;
in the formula (1), h1And h2Are all calculated by the following formula:
wherein h is the convective heat transfer coefficient, Nu is the Nu, K is the thermal conductivity of the stationary fluid, and D is the hydraulic diameter;
in the formula (2), Nu is calculated by the following formula:
Nu＝aRebPrc (3)
wherein, Re is Reynolds number, which can be calculated by the inlet state of the fluid and the structure of the flow channel; pr is a Plantt number, which can be found from the fluid state; the coefficients a, b and c are constant values and can be obtained by searching a heat transfer relational expression.
9. The automatic cleaning method for a diffusion-welded hybrid heat exchanger as recited in claim 8, wherein in step S2, the actual heat transfer coefficient of the hybrid heat exchanger is calculated as follows:
1) actual heat transfer capacity of hybrid heat exchanger
Q1＝m1(h1,i-h1,o)
Q2＝m2(h2,o-h2,i)
Wherein Q is1Is the heat release of the fluid in the fin, Q2For heat absorption of the fluid in the etching plate, QaveM is the heat transfer capacity of the cold and hot fluid1Is the mass flow of fluid in the finned passage，m2For the mass flow of the fluid in the etching channel, h1,i、h1,oInlet and outlet enthalpy values, h, of the finned passage fluid, respectively2,i、h2,oRespectively is an inlet enthalpy value and an outlet enthalpy value of etching channel fluid;
2) actual heat transfer coefficient of hybrid heat exchanger
Wherein, K0Is the actual total heat transfer coefficient of the hybrid heat exchanger; a. the1Is the heat exchange area of the fin channel; delta TLMTDFor the logarithmic mean temperature difference, the following formula was used:
wherein, Th,iIs the fin side inlet temperature, Th,oIs fin side outlet temperature, Tc,iFor the side inlet temperature of the etching plate, Tc,oIs the etch plate side exit temperature.
10. The method of claim 9, wherein the actual performance of the hybrid heat exchanger is calculated in step S2 using the following equation:
when eta is more than or equal to 0 and less than or equal to 0.8, judging that the heat exchanger needs to be cleaned; when eta is more than 0.8 and less than or equal to 1, the heat exchanger is judged not to need to be cleaned.
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