CN210069905U - Anti-blocking ash type heating surface rotary air preheater - Google Patents
Anti-blocking ash type heating surface rotary air preheater Download PDFInfo
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- CN210069905U CN210069905U CN201920719876.XU CN201920719876U CN210069905U CN 210069905 U CN210069905 U CN 210069905U CN 201920719876 U CN201920719876 U CN 201920719876U CN 210069905 U CN210069905 U CN 210069905U
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Abstract
An anti-blocking ash type heating surface rotary air preheater is characterized in that a circulating air channel is axially arranged on the air side of a rotor, the radial cross section of the circulating air channel is in a small fan shape, the central angle of the circulating air channel pointing to the center of the rotor along the horizontal direction is 5-20 degrees, the cold end of the circulating air channel is communicated with the air outlet of a lower circulating air pipe through a cold end heating air cover, the air outlet of the cold end heating air cover is in a small fan shape which is in butt joint with the radial cross section of the circulating air channel, the air inlet of the lower circulating air pipe is communicated with the air outlet of a fan, a lower circulating air pipe air door is connected to the lower circulating air pipe in series, and the outer surface of the lower circulating air pipe is. The anti-blocking type heating surface rotary air preheater has the advantages that the ash deposition and the scale deposition on the inner wall of the bin and the surface of the heat transfer element are reduced or avoided more thoroughly, the ash deposition and scale deposition preventing effect is better, and the heat exchange efficiency of the heating surface rotary air preheater can be improved more remarkably.
Description
Technical Field
The utility model relates to a prevent stifled grey type heating surface rotary air heater.
Background
The existing rotary air preheater with heating surface is characterized in that a plurality of partition plates are arranged in the rotor along the vertical direction along the radial direction, the rotor is divided into a plurality of fan-shaped chambers by the partition plates, a heat transfer element is arranged in each chamber, a flue gas channel is arranged on the right side of the shell along the vertical direction and penetrates through the chambers of the rotor in the shell, the lower end of the flue gas channel, namely the cold end of the rotor, is a flue gas outlet, the upper end of the flue gas channel, namely the hot end of the rotor, is a flue gas inlet, the left side of the shell is provided with a low-pressure secondary air channel and a high-pressure primary air channel along the vertical direction, the low-pressure secondary air channel and the high-pressure primary air channel penetrate through the chambers of the rotor in the shell respectively, the lower ends of the low-pressure secondary air channel and the high-pressure primary air channel, namely the cold end of the rotor, when the heated heat transfer element rotates to the low-pressure secondary air channel and the high-pressure primary air channel, the air passing through the low-pressure secondary air channel and the high-pressure primary air channel from bottom to top is heated by the heat transfer element, so that the heat in the flue gas is transferred to the air passing through the low-pressure secondary air channel and the high-pressure primary air channel. However, in the existing heating surface rotary air preheater, when the flue gas passing through the flue gas channel is in use, a certain amount of condensate which is condensed into liquid state at a lower temperature exists in the flue gas, when the condensate in the flue gas passes through the bin on the rotor in the flue gas channel, if the temperature of the inner wall of the bin is lower, the condensate is deposited on the inner wall of the bin at the lower temperature and the surface of the heat transfer element, because of the existence of the condensate in the flue gas, a large amount of dust is accumulated on the inner wall of the bin and the surface of the heat transfer element, and finally the flue gas channel, the low-pressure secondary air channel and the high-pressure primary air channel are seriously blocked, the heat exchange efficiency is greatly reduced, so that the equipment can normally work only by cleaning and dredging. In addition, the existing method for cleaning dust accumulated on the inner wall of the bin and the surface of the heat transfer element is to use pressure gas to blow soot, which has poor cleaning effect, causes the heat exchange efficiency of the equipment to be reduced, and causes the waste of energy.
The lower condition of temperature of above-mentioned bin inner wall appears at the cold junction of rotor more, because the air that gets into the rotor can cool off the cold junction of rotor high-efficiently, and the cold junction that gets into the flue gas passageway soon when the cold junction rotation of rotor, the temperature of rotor cold junction has not risen yet, and the condensate in the flue gas is gathered with heat transfer element's surface on will the inner wall in bin, leads to flue gas passageway, low pressure overgrate air passageway, high pressure primary air passageway to be seriously obstructed, and heat exchange efficiency reduces by a wide margin.
In order to prevent the rotor of the heating surface rotary air preheater from being blocked by dust and the like, in the prior art, a hot air flow is led out from the hot end of the air side of the rotor of the heating surface rotary air preheater to the cold end of the rotor, the hot air from the hot end is used for heating the cold end of the rotor, so that the temperature of the cold end of the rotor can be raised in advance, after the rotor enters a flue gas channel, the condensable substances in the flue gas cannot be condensed on the inner wall of a bin chamber and a heat transfer element positioned in the bin chamber due to the high temperature of the cold end of the rotor, and then the circulating hot air flow passing through the inner wall of each bin chamber of a hot air return channel and the surface of the heat transfer element positioned in the bin chamber at high speed blows off the dust and scale possibly existing on the inner wall of the bin chamber and the heat transfer element positioned in the bin chamber, so that the dust and scale cannot be accumulated on the surface, dust, etc. However, the above prior art presents various new problems in the using process, mainly including the following aspects:
1. in different seasons, the air has great temperature difference, the temperature of the air in winter is very low and may be as low as minus 10 ℃ to 20 ℃, and in summer, the temperature of the air can rise to 30 ℃ to 40 ℃, because boilers of power plants mostly work continuously for 24 hours every day and four seasons every year, a rotary air preheater with a heating surface matched with the boilers also needs to work continuously for 24 hours every day and four seasons every year, in the process of running in summer, the temperature of the air entering the cold end of the rotor of the air preheater is higher, so that the temperature of the cold end of the rotor of the air preheater in the period is higher, the flow of hot air needed for heating the cold end of the rotor of the air preheater to a set temperature can be less, in winter, because the temperature of the air entering the cold end of the rotor of the air preheater is very low, the temperature of the cold end of the rotor of the air preheater in the period is also very, the flow of hot air required to heat the cold end of the air preheater rotor to the set temperature is greater. How to maintain the cold end of the air preheater rotor within the set temperature range under such varying conditions has been an unsolved technical problem for those skilled in the art.
2. In the normal operation process of the air preheater, the air input of the cold air at the air side of the air preheater can be greatly changed along with the combustion requirement of the boiler, and how to maintain the cold end of the rotor of the air preheater within a set temperature range under the changed condition is a technical problem which cannot be solved by the technical personnel in the field.
3. Because the power plant boiler has special requirements on continuous work and cannot be shut down at will, the air preheater which is matched with the power plant boiler for work also needs to have stronger continuous working capacity and cannot be shut down under general conditions, the existing equipment for improving the temperature of the cold end of the rotor of the air preheater cannot solve the problem, and once various newly added components break down, the newly added components are difficult to maintain and replace in time.
4. The air at the hot end of the air preheater is conveyed to the cold end, the consumption of the hot air which needs to be conveyed to the boiler can be influenced, and then the normal operation of the boiler is not influenced.
5. From the hot junction of air heater rotor to the hot-air of rotor cold junction backward flow, when blowing to the cold junction of rotor, need a circulated air passageway to carry out the heat exchange, the cold junction of rotor is transmitted to the heat of hot-air, the size of this circulated air passageway can be to "let the air heater rotor cold junction maintain in setting for the temperature range" produce decisive influence, the circulated air passageway is too big or the undersize, all can cause "the air heater rotor cold junction can't maintain in setting for the temperature range", but technical personnel in the field of the part of the jurisdiction fail to solve this problem well always.
Since the technical problems mentioned above are not solved by those skilled in the art, the result of energy-saving modification of the heating surface rotary air preheater using the above-mentioned prior art is not ideal, and it is difficult to achieve the objective of ash blockage prevention of the rotor of the heating surface rotary air preheater. How to still ensure that the cold end of the rotor of the air preheater can be maintained in a set temperature range in various complex changes, and then the energy-saving modified heating surface rotary air preheater can really prevent the rotor of the heating surface rotary air preheater from being blocked by coagulable substances, dust and the like in smoke all the year round, and how to select and design the size of a circulating air channel.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a reduce or avoid on the inner wall of bin and heat transfer element's on the surface deposition, scaling more thoroughly, prevent that the effect of deposition, scaling from appearing better, improvement heating surface rotary air heater's that can more show heat exchange efficiency, detection, easy maintenance prevent stifled ash type heating surface rotary air heater.
The utility model discloses an prevent stifled ash type heating surface rotary air heater, including the rotor, the rotor includes the radial baffle that a plurality of faces are located vertical direction, radial baffle divides into a plurality of fan-shaped storehouses with the rotor, be equipped with the heating element in the fan-shaped storehouse, the rotor includes air side and flue gas side, the upper end of rotor is the hot junction, the lower extreme is the cold junction, the rotor is installed on the rotor shaft, the rotor shaft sets up along vertical direction, the hot junction of the flue gas side of rotor is into advances the mouth, the cold junction of the flue gas side of rotor is the outlet flue, it is continuous through the flue gas passageway that passes the flue gas side of rotor along the axial to advance the mouth and the outlet flue, the hot junction of the air side of rotor is hot air outlet, the cold junction of the air side of rotor is air inlet, air inlet and hot air outlet are continuous through the air passageway that passes the air side of rotor along the axial, the air side of rotor is equipped with the, the radial cross section of the circulating air channel is in a small fan shape, the central angle of the circulating air channel pointing to the center of the rotor in the horizontal direction is 5-20 degrees, the cold end of the circulating air channel is communicated with the air outlet of the lower circulating air pipe through a cold end heating air cover, the air outlet of the cold end heating air cover is in a small fan shape which is in butt joint with the radial cross section of the circulating air channel, the air inlet of the lower circulating air pipe is communicated with the air outlet of the fan, the lower circulating air pipe is connected with a lower circulating air pipe air door in series, and the outer surface of the lower circulating air pipe is coated with a lower circulating air pipe heat;
an air inlet of the fan is communicated with an air outlet of the upper circulating air pipe, a fan heat-insulating layer is arranged on the outer surface of the fan, an upper circulating air pipe air door is connected in series on the upper circulating air pipe, an upper circulating air pipe heat-insulating layer is coated on the outer surface of the upper circulating air pipe, and the air inlet of the upper circulating air pipe is communicated with a hot air outlet;
and a cold end sector plate for circulating air sealing is additionally arranged between the air inlet of the circulating air channel and the air inlet of the low-pressure secondary air channel, and the surface of the cold end sector plate for circulating air sealing is positioned in the horizontal direction.
Preferably, a housing support plate is arranged around the outer side of the rotor, and an inspection and maintenance platform is arranged on the outer side of the housing support plate and comprises a patrol inspection channel and a ladder for climbing on the inspection and maintenance platform;
the installation position of the fan is lower than the shell support plate or the inspection and maintenance platform, and the upper circulating air pipe extends upwards from the outer side of the shell support plate or the inspection and maintenance platform to the hot air outlet.
Preferably, the central angle of the circulating air channel pointing to the center of the rotor along the horizontal direction is 7-16 degrees, the fan is installed and fixed on the ground, the air inlet of the fan and the air outlet of the upper circulating air pipe and the air outlet of the fan and the air inlet of the lower circulating air pipe are respectively connected through a pipeline expansion joint, and the outer surface of the pipeline expansion joint is coated with a pipeline expansion joint heat-insulating layer.
Preferably, the central angle of the circulating air channel pointing to the center of the rotor along the horizontal direction is 9-11 degrees, an annular upper connecting plate is arranged above the shell support plate and the rotor, an upper connecting beam is radially arranged on the upper connecting plate along the horizontal direction, an annular lower connecting plate is arranged below the shell support plate and the rotor, a lower connecting beam is radially arranged on the lower connecting plate along the horizontal direction, the upper end of the rotor shaft is rotatably arranged in the middle of the upper connecting beam, and the lower end of the rotor shaft is rotatably arranged in the middle of the lower connecting beam.
Preferably, the lower circulating air pipe air door is an electric air door or a pneumatic air door, and the upper circulating air pipe air door is an electric air door or a pneumatic air door.
Preferably, the air side of the rotor is provided with a high-pressure primary air channel and a low-pressure secondary air channel, and the circulating air channel is positioned between the low-pressure secondary air channel and the smoke channel or between the high-pressure primary air channel and the low-pressure secondary air channel.
The invention is provided with a circulating air channel along the axial direction at the air side of a rotor, and the radial cross section of the circulating air channel is in a small fan shape, especially the central angle of the circulating air channel pointing to the center of the rotor along the horizontal direction is set to be 5-20 degrees, the cold end of the circulating air channel is communicated with the air outlet of a lower circulating air pipe through a cold end heating air cover, the air outlet of the cold end heating air cover is in a small fan shape which is butted with the radial cross section of the circulating air channel, the structural design and the circular angle of the specific circulating air channel pointing to the center of the rotor along the horizontal direction are set to be 5-20 degrees, the cold end of the rotor of an air preheater can be maintained in a cold winter, in a hot summer and under the condition that the air input quantity of cold air at the air side of the air preheater is greatly changed along with the combustion requirement of a boiler, and can also be maintained, the rotor of the rotary air preheater with the heating surface can be prevented from being blocked by the condensable matters and dust in the flue gas for a longer time;
according to the invention, the outer surface of the upper circulating air pipe is coated with the upper circulating air pipe heat-insulating layer, the outer surface of the lower circulating air pipe 7 is coated with the lower circulating air pipe heat-insulating layer, and the outer surface of the fan is provided with the fan heat-insulating layer, so that the heat dissipation loss of hot air conveyed to the cold end heating fan housing through the upper circulating air pipe, the fan and the lower circulating air pipe can be reduced, the efficiency and the heating temperature of the cold end of the heating rotor can be effectively improved, the quantity of hot air required to be conveyed by the fan can be effectively reduced, and a large amount of energy can be saved;
according to the invention, the upper circulating air pipe air door is connected in series with the upper circulating air pipe, and the lower circulating air pipe air door is connected in series with the lower circulating air pipe, so that when the dust removal and maintenance of the fan are required, or the dust removal, detection and maintenance of the pipe sections of the upper circulating air pipe and the lower circulating air pipe 7 close to the fan are required, the upper circulating air pipe air door and the lower circulating air pipe air door can be closed at the same time, and the air conveyed to the boiler direction by a pipeline system can be prevented from being leaked out in the process of maintaining and cleaning the fan, the upper circulating air pipe and the lower circulating air pipe.
Therefore, the utility model discloses an prevent stifled grey type heating surface rotary air preheater has on the inner wall that reduces or avoid the bin and heat transfer element's on the surface deposition, scaling more thoroughly, prevent that the effect of deposition, scaling from appearing better, detect, easy maintenance's the characteristics that can more show improvement heating surface rotary air preheater's heat exchange efficiency.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a perspective view of an ash blocking prevention type heating surface rotary air preheater of the present invention from bottom to top;
FIG. 2 is a perspective view of the ash blocking prevention rotary air preheater from bottom to top with the cold end heating hood removed;
fig. 3 is a top-down perspective view of the ash blocking prevention rotary air preheater of the present invention.
Detailed Description
As shown in fig. 1, 2 and 3, the ash blocking prevention type rotary air preheater of the present invention comprises a rotor 1, the rotor includes a plurality of radial partitions (not shown) having vertical surfaces, the radial partitions divide the rotor into a plurality of sector-shaped bins, heating elements (not shown) are disposed in the sector-shaped bins, the rotor 1 includes an air side and a flue gas side, the upper end of the rotor 1 is a hot end, the lower end of the rotor is a cold end, the rotor 1 is mounted on a rotor shaft 2, the rotor shaft 2 is disposed along the vertical direction, the hot end of the flue gas side of the rotor 1 is a flue gas inlet 3, the cold end of the flue gas side of the rotor 1 is a flue gas outlet 4, the flue gas inlet 3 and the flue gas outlet 4 are connected by a flue gas passage axially passing through the flue gas side of the rotor 1, the hot end of the air side of the rotor 1 is a hot air outlet 5, the cold end of the air side of the rotor 1 is an air inlet 6, the air inlet 6 and the hot air outlet 5 are connected by an air passage axially passing through the air passage axially passing, the air side of the rotor 1 is axially provided with a circulating air channel 9, the radial cross section of the circulating air channel 9 is in a small fan shape, the central angle of the circulating air channel 9, which points to the center of the rotor 1 along the horizontal direction, is 5-20 degrees, the cold end of the circulating air channel 9 is communicated with the air outlet of a lower circulating air pipe 7 through a cold end heating air cover 8, the air outlet of the cold end heating air cover 8 is in a small fan shape which is in butt joint with the radial cross section of the circulating air channel 9, the air inlet of the lower circulating air pipe 7 is communicated with the air outlet of a fan 10, a lower circulating air pipe air door 12 is connected to the lower circulating air pipe 7 in series, and the outer surface of the lower circulating air pipe 7 is coated with;
an air inlet of the fan 10 is communicated with an air outlet of the upper circulating air pipe 11, a fan heat-insulating layer is arranged on the outer surface of the fan 10, an upper circulating air pipe air door 13 is connected to the upper circulating air pipe 11 in series, an upper circulating air pipe heat-insulating layer is coated on the outer surface of the upper circulating air pipe 11, and the air inlet of the upper circulating air pipe 11 is communicated with the hot air outlet 5;
and a cold end sector plate 14 for circulating air sealing is additionally arranged between the air inlet of the circulating air channel 9 and the air inlet of the low-pressure secondary air channel, and the plate surface of the cold end sector plate 14 for circulating air sealing is positioned in the horizontal direction.
The influence of the hot air conveyed to the cold end of the rotor by the circulating air channel 9 on the temperature rise of the cold end of the rotor is very complex, generally speaking, under the condition of the same air volume, the higher the temperature of the hot air is, the higher the temperature of the cold end can be increased, and the less the air volume is required under the condition of setting the temperature required by the cold end, so that the ash blockage prevention effect can be more remarkably improved.
In addition, the pressure of hot-air also can have certain influence to above-mentioned effect, and the hot-air that is pressure high generally is because the heat that the unit volume carried is big, and the effect of its heating cold junction can be better than the hot-air that pressure is low, but the influence of this factor is less than the difference in temperature, because the speed that hot-air passes through the cold junction is very fast, does not have the time to accomplish temperature balance.
The invention is provided with a circulating air channel 9 along the axial direction at the air side of a rotor 1, and the radial cross section of the circulating air channel 9 is in a small fan shape, especially the central angle of the circulating air channel 9 pointing to the center of the rotor 1 along the horizontal direction is set to be 5-20 degrees, the cold end of the circulating air channel 9 is communicated with the air outlet of a lower circulating air pipe 7 through a cold end heating air cover 8, the air outlet of the cold end heating air cover 8 is in a small fan shape which is opposite to the radial cross section of the circulating air channel 9, the structural design and the central angle of the specific circulating air channel 9 pointing to the center of the rotor 1 along the horizontal direction are set to be 5-20 degrees, the cold end of the rotor of the air preheater can be maintained in cold winter, hot summer and under the condition that the air input of cold air at the air side of the air preheater can be greatly changed along with the combustion requirement of a boiler, the temperature of the rotor can be kept within a set temperature range, so that the rotor of the rotary air preheater with the heating surface can be prevented from being blocked by condensable matters and dust in flue gas better and more thoroughly in a longer time.
According to the invention, the outer surface of the upper circulating air pipe 11 is coated with the upper circulating air pipe heat-insulating layer, the outer surface of the lower circulating air pipe 7 is coated with the lower circulating air pipe heat-insulating layer, and the outer surface of the fan 10 is provided with the fan heat-insulating layer, so that the heat dissipation loss of the hot air conveyed to the cold end heating fan cover 8 through the upper circulating air pipe 11, the fan 10 and the lower circulating air pipe 7 can be reduced, the efficiency and the heating temperature of the cold end of the heating rotor can be effectively improved, the quantity of the hot air required to be conveyed by the fan 10 can be effectively reduced, and a large amount of energy can be saved.
The invention is characterized in that an upper circulating air pipe air door 13 is connected in series on an upper circulating air pipe 11, a lower circulating air pipe air door 12 is connected in series on a lower circulating air pipe 7, a fan 10 and a pipeline expansion joint which is mentioned below are arranged on a pipeline between the upper circulating air pipe air door 13 and the lower circulating air pipe air door 12, the design is that the air preheater can not be stopped normally, otherwise, the power generation of a power plant can be influenced, and great economic loss is caused, the fan 10 and the pipeline expansion joint can need to be cleaned and maintained, the upper circulating air pipe 11 and the lower circulating air pipe 7 need to be cleaned, detected and maintained, therefore, the design that the upper circulating air pipe air door 13 is connected in series on the upper circulating air pipe 11, the lower circulating air pipe air door 12 is connected in series on the lower circulating air pipe 7, when the circulating air pipe 10 and the pipeline expansion joint need to be cleaned and maintained, or the pipe sections of the upper circulating air pipe 11 and the lower air pipe 7 close to the fan 10 are cleaned and maintained, During detection and maintenance, the upper circulating air pipe air door 13 and the lower circulating air pipe air door 12 can be closed at the same time, and therefore the air conveyed to the boiler direction by the pipeline system can not be leaked out in the process of maintaining and cleaning the fan 10, the pipeline expansion joint, the upper circulating air pipe 11 and the lower circulating air pipe 7.
As a further improvement of the present invention, a housing support plate (not shown) is disposed around the outer side of the rotor 1, and an inspection and maintenance platform (not shown) is disposed outside the housing support plate, the inspection and maintenance platform including a patrol inspection channel (not shown) and a ladder (not shown) for climbing the inspection and maintenance platform;
the fan 10 is installed at a position lower than the housing support plate or the inspection and maintenance platform, and the upper circulation duct 11 extends upward from the outer side of the housing support plate or the inspection and maintenance platform to the hot air outlet 5.
As a further improvement of the present invention, the central angle of the above-mentioned circulation air channel 9 along the center of the directional rotor 1 in the horizontal direction is 7 ° -16 °, the fan 10 is installed and fixed on the ground, the air inlet of the fan 10 is connected with the air outlet of the upper circulation air pipe 11 and the air outlet of the fan 10 is connected with the air inlet of the lower circulation air pipe 7 through the pipe expansion joint (not shown in the figure), and the outer surface of the pipe expansion joint is coated with the pipe expansion joint heat insulation layer (not shown in the figure).
As a further improvement of the utility model, the central angle at above-mentioned circulation wind passageway 9 edge horizontal direction directional rotor 1 center is 9 ° -11, the sealed cold junction sector plate 14 of using of circulation wind is 9 ° -11 along the central angle at horizontal direction directional rotor 1 center, shell bedplate and rotor 1's top is equipped with annular upper junction plate, radially is equipped with the tie-beam along the level on the upper junction plate, and the below of shell bedplate and rotor 1 is equipped with annular lower connecting plate, radially is equipped with down the tie-beam along the level on the lower connecting plate, and the middle part at last tie-beam is rotationally installed to the upper end of rotor shaft 2, and the middle part at lower tie-beam is rotationally installed to the lower extreme of rotor shaft 2.
As a further improvement of the utility model, the lower circulating air duct air door 12 is an electric air door or a pneumatic air door, and the upper circulating air duct air door 13 is an electric air door or a pneumatic air door.
As a further improvement of the present invention, the air side of the rotor 1 is provided with a high-pressure primary air passage 16 and a low-pressure secondary air passage 17, and the circulating air passage 9 is located between the low-pressure secondary air passage 17 and the flue gas passage or between the high-pressure primary air passage 16 and the low-pressure secondary air passage 17.
The applicant collects experimental data of resistance change of airflow of a secondary air channel on a rotor of the heating surface rotary air preheater in the operation process through an experiment that the rotor of the heating surface rotary air preheater is provided with a circulating air channel 9, and the data content is as follows:
TABLE 1
The pressure value P in the table is the initial pressure value after the condensate and dust inside the rotor of the heating surface rotary air preheater are thoroughly cleaned, 1 month means the time when the heating surface rotary air preheater normally operates for one month, and at this time, the resistance value of the secondary air passage of the heating surface rotary air preheater, and the other 2 months, 3 months, … …, and 12 months all mean the normal operation time of the heating surface rotary air preheater.
The data in table 1 are data of resistance values of the upper side and the lower side of the secondary air channel collected, the central angle of the circulating air channel is β, the pressure value P therein is the air pressure difference value of the upper end and the lower end of the heating surface rotary air preheater on the secondary air conveying pipeline which is just cleaned and dredged, the air flow resistance value of the secondary air channel on the rotor of the heating surface rotary air preheater is reflected, the resistance value generally gradually increases along with the continuous operation of the heating surface rotary air preheater, and the reason of the increase of the resistance value is that the condensable matters in the flue gas can be condensed on the inner wall of the chamber of the rotor and the heat transfer elements in the chamber, so that a large amount of condensable matters and dust in the interior of the rotor block the air flow channel.
It can be seen from table 1 that, when the circulating air passage 9 is not provided on the rotor of the rotary air preheater without the heating surface, that is, the central angle β of the circulating air passage is zero, the resistance value of the secondary air passage of the rotary air preheater with the heating surface is P after cleaning, and the timing is started after cleaning, after 1 month of operation, the resistance value rises to 1.08P, after 3 months of operation, the resistance value rises to 1.23P, after 6 months of operation, the resistance value rises to 1.42P, and after 12 months of operation, the resistance value of the secondary air passage of the rotary air preheater with the heating surface rises to 1.65P, and the resistance value of the secondary air passage of the rotary air preheater is designed to be not more than 1.2P, otherwise, the cleaning is required, but the power plant needs to operate continuously, so that the rotary air preheater with the heating surface used with the boiler of the power plant also needs to operate continuously for one year, and therefore, the energy consumption of the rotary air preheater is greatly reduced.
When the rotor of the heating surface rotary air preheater is provided with the circulating air channel 9 and the central angle β of the self-circulating air channel is 5 degrees, the initial resistance value of the secondary air channel of the heating surface rotary air preheater after cleaning is 1.03P, the timing is started after cleaning, the resistance value is increased to 1.05P after 1 month of operation, the resistance value is increased to 1.11P after 3 months of operation, the resistance value is increased to 1.15P after 6 months of operation, and the resistance value is increased to 1.19P after 12 months of operation, namely the resistance value of the secondary air channel of the heating surface rotary air preheater does not exceed 1.2P after 12 months of operation, thereby meeting the design requirement that the heating surface rotary air preheater matched with a power plant boiler needs to continuously operate for one year.
It can be seen from the experimental data listed in table 1 that when the central angles β of the circulating air channel 9 and the self-circulating air channel provided on the rotor of the heating surface rotary air preheater are respectively 7 °, 9 °, 11 °, 13 °, 15 °, 17 °, and 20 °, the resistance values of the secondary air channels of the heating surface rotary air preheater start to be measured after cleaning, and after 12 months of operation, the resistance values of the secondary air channels of the heating surface rotary air preheater do not exceed 1.2P, and also meet the design requirement that the heating surface rotary air preheater used in cooperation with the power plant boiler needs to be continuously operated for one year.
After the circulating air channel 9 is arranged on the rotor of the heating surface rotary air preheater, the initial resistance value of the secondary air channel can be increased to 1.03P instead of the original P, the reason is that the circulating air channel 9 occupies the channel area originally belonging to the secondary air channel, so that compared with the original secondary air channel, the ventilation section of the secondary air channel after modification is reduced, but the ventilation area of the smoke channel and the ventilation area of the primary air channel are not changed.
The resistance values of the flue gas channel and the primary air channel of the heating surface rotary air preheater are counted after cleaning, and after 12 months of operation, the resistance values of the secondary air channel of the heating surface rotary air preheater do not exceed 1.2 times of the initial resistance value, and the design requirement that the heating surface rotary air preheater matched with a power plant boiler needs to be operated continuously for one year is met. Namely, when the central angle of the circulating air channel 9 pointing to the center of the rotor 1 along the horizontal direction is 5-20 degrees, the resistance value of the secondary air channel of the heating surface rotary air preheater starts to be timed after cleaning, and after 12 months of operation, the resistance values of the flue gas channel and the primary air channel of the heating surface rotary air preheater do not exceed 1.2 times of the initial resistance value, so that the design requirement that the heating surface rotary air preheater used with a power plant boiler needs to continuously operate for one year is met.
Sector (symbol:
) It is a portion of a circle, bounded by two radii and an arc, and is called a small sector in the smaller area and a large sector in the larger area.
The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and various modifications and improvements made by the technical solutions of the present invention by those skilled in the art are all within the scope of the present invention as defined by the appended claims.
Claims (6)
1. Prevent stifled ash type heating surface rotary air heater, including rotor (1), the rotor includes that a plurality of faces are located the radial baffle of vertical direction, radial baffle divides into a plurality of fan-shaped storehouses with the rotor, be equipped with the heating element in the fan-shaped storehouse, rotor (1) includes air side and flue gas side, the upper end of rotor (1) is the hot junction, the lower extreme is the cold junction, rotor (1) is installed on rotor shaft (2), rotor shaft (2) set up along vertical direction, the hot junction of the flue gas side of rotor (1) is for advancing cigarette mouth (3), the cold junction of the flue gas side of rotor (1) is for outlet flue (4), it links to each other to advance cigarette mouth (3) and outlet flue (4) through the flue gas passageway that passes the flue gas side of rotor (1) along the axial, the hot junction of the air side of rotor (1) is hot air outlet (5), the cold junction of the air side of rotor (1) is air inlet (6), air inlet (6) and hot air outlet (5) pass through the air side that passes the rotor (1) along the The air channel is connected, and its characterized in that: the air side of the rotor (1) is axially provided with a circulating air channel (9), the radial cross section of the circulating air channel (9) is in a small fan shape, the central angle of the circulating air channel (9) pointing to the center of the rotor (1) along the horizontal direction is 5-20 degrees, the cold end of the circulating air channel (9) is communicated with the air outlet of a lower circulating air pipe (7) through a cold end heating fan cover (8), the air outlet of the cold end heating fan cover (8) is in a small fan shape butted with the radial cross section of the circulating air channel (9), the air inlet of the lower circulating air pipe (7) is communicated with the air outlet of a fan (10), the lower circulating air pipe (7) is connected with a lower circulating air door (12) in series, and the outer surface of the lower circulating air pipe (7) is coated with a lower circulating air pipe heat-insulating layer;
an air inlet of the fan (10) is communicated with an air outlet of the upper circulating air pipe (11), a fan heat-insulating layer is arranged on the outer surface of the fan (10), an upper circulating air pipe air door (13) is connected in series on the upper circulating air pipe (11), an upper circulating air pipe heat-insulating layer is coated on the outer surface of the upper circulating air pipe (11), and the air inlet of the upper circulating air pipe (11) is communicated with the hot air outlet (5);
and a cold end fan-shaped plate (14) for sealing the circulating air is additionally arranged between the air inlet of the circulating air channel (9) and the air inlet of the low-pressure secondary air channel.
2. An ash blockage prevention type heating surface rotary air preheater according to claim 1, wherein: a shell support plate is arranged on the outer side of the rotor (1) in a surrounding mode, an inspection and maintenance platform is arranged on the outer side of the shell support plate, and the inspection and maintenance platform comprises an inspection and maintenance channel and a ladder used for climbing on the inspection and maintenance platform;
the installation position of the fan (10) is lower than that of the shell support plate or the inspection and maintenance platform, and the upper circulating air pipe (11) extends upwards from the outer side of the shell support plate or the inspection and maintenance platform to the position of the hot air outlet (5).
3. An ash blockage prevention type heating surface rotary air preheater according to claim 2, wherein: the central angle of the circulating air channel (9) pointing to the center of the rotor (1) along the horizontal direction is 7-16 degrees, the fan (10) is installed and fixed on the ground, an air inlet of the fan (10) is connected with an air outlet of the upper circulating air pipe (11) through a pipeline expansion joint, an air outlet of the fan (10) is connected with an air inlet of the lower circulating air pipe (7) through a pipeline expansion joint, and a pipeline expansion joint heat-insulating layer is coated on the outer surface of the pipeline expansion joint.
4. An anti-blocking heating surface rotary air preheater as recited in claim 3, wherein: the central angle of the circulating wind channel (9) pointing to the center of the rotor (1) along the horizontal direction is 9-11 degrees, an annular upper connecting plate is arranged above the shell support plate and the rotor (1), an upper connecting beam is radially arranged on the upper connecting plate along the horizontal direction, an annular lower connecting plate is arranged below the shell support plate and the rotor (1), a lower connecting beam is radially arranged on the lower connecting plate along the horizontal direction, the upper end of the rotor shaft (2) is rotatably arranged in the middle of the upper connecting beam, and the lower end of the rotor shaft (2) is rotatably arranged in the middle of the lower connecting beam.
5. An anti-blocking heating surface rotary air preheater as recited in claim 4, wherein: the lower circulating air pipe air door (12) is an electric air door or a pneumatic air door, and the upper circulating air pipe air door (13) is an electric air door or a pneumatic air door.
6. An anti-blocking type heating surface rotary air preheater according to any one of claims 1 to 5, wherein: the air side of the rotor (1) is provided with a high-pressure primary air channel (16) and a low-pressure secondary air channel (17), and the circulating air channel (9) is positioned between the low-pressure secondary air channel (17) and the smoke channel or between the high-pressure primary air channel (16) and the low-pressure secondary air channel (17).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920719876.XU CN210069905U (en) | 2019-05-20 | 2019-05-20 | Anti-blocking ash type heating surface rotary air preheater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920719876.XU CN210069905U (en) | 2019-05-20 | 2019-05-20 | Anti-blocking ash type heating surface rotary air preheater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030575A (en) * | 2019-05-20 | 2019-07-19 | 孟金来 | Anti-blocking ash type air pre-heater with rotary heating surface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030575A (en) * | 2019-05-20 | 2019-07-19 | 孟金来 | Anti-blocking ash type air pre-heater with rotary heating surface |
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