Rotary air pre-heater system capable of preventing blockage of ammonium bisulfate

Abstract

The utility model discloses a rotary air pre-heater system capable of preventing ammonium bisulfate from being blocked, which comprises a rotary air pre-heater, and the interior of the rotary air pre-heater is divided into a first hot smoke branch bin and at least one first heating branch bin; the interior of the front air pre-heater is divided into front hot smoke sub-bins and front heating sub-bins, and the number of the front heating sub-bins corresponds to that of the first heating sub-bins; hot smoke generated in an upstream process is introduced into the first hot smoke branch bin through a hot smoke main pipe for primary cooling, then is introduced into the front hot smoke branch bin through a hot smoke discharge main pipe for secondary cooling, and is discharged to a downstream smoke treatment device; a hot smoke guide main pipe capable of being opened and closed is communicated between the hot smoke main pipe and the hot smoke discharge main pipe; airflow blown by the cold air fan sequentially enters the front heating branch bin, the first heating branch bin and the hot air demand equipment in a communicating mode along a pipeline, the front air pre-heater is arranged, so that the blockage problem of a rotary air pre-heater is completely solved, and hot smoke is periodically led into the front air pre-heater for blockage clearing.

Description

Technical Field

[0001] The utility model relates to the field of anti-clogging of rotary air preheaters, and more specifically, to an anti-ammonium bisulfate clogging rotary air preheater system. Background Art

[0002] As an effective heat exchange equipment, the rotary air preheater is widely used in various power station boilers. The rotary air preheater transfers heat in a regenerative manner, and the flue gas and air flow through the corresponding compartments. When the flue gas flows through, the heat is transferred from the flue gas to the heat transfer element in the rotary air preheater. When the heat transfer element is transferred to the compartment corresponding to the cold air, the heat transfer element releases the accumulated heat into the cold air. The blockage of the rotary air preheater is a common problem. At present, the escaped ammonia in the power station boiler after denitrification treatment is easy to react with SO3 in the flue gas to form ammonium bisulfate. The hot end temperature of the rotary air preheater is generally between 300℃-350℃, and the cold end temperature is generally controlled between 120℃-150℃. The melting point of ammonium bisulfate is 147℃, and the boiling point is 147℃. The temperature of ammonium bisulfate is 350℃, the vaporization start temperature is 174℃, and the vaporization rate reaches the maximum value at 323℃. The process of ammonium bisulfate passing through the rotary air preheater is the stage of transformation from gas to liquid and solid. Ammonium bisulfate in liquid state has extremely strong adsorption, which adsorbs a large amount of ash and adheres to the air preheater, causing the air preheater to be blocked and the resistance to rise rapidly, increasing the output of the induced draft fan, thereby causing an increase in the power consumption rate of the power plant; at the same time, the blockage of the air preheater will seriously affect the heat exchange capacity of the air preheater, and the exhaust gas temperature at the outlet of the air preheater will increase significantly, which will have an adverse effect on the thermal efficiency of the boiler.

[0003] At present, most power plant boilers use the following methods to solve the problem of air preheater blockage: 1) The rotary air preheater adopts a two-stage layout, that is, only a high-temperature section and a low-temperature section are set, the medium-temperature section is cancelled, and the height of the low-temperature section is increased as much as possible, so that ammonium bisulfate is deposited in the low-temperature section. At the same time, the heat exchange element of the low-temperature section adopts the enamel plating process. 2) A steam heater or hot air recirculation is used at the inlet of the rotary air preheater to increase the cold air temperature at the inlet of the air preheater. 3) Since the phase change of ammonium bisulfate is reversible in a short time, the ammonium bisulfate that has been deposited on the heat transfer element can be dissolved and sublimated again by increasing the temperature. The ammonium bisulfate can be dissolved again by introducing heated air into the rotary air preheater for a short time. Patent application number CN202210306340.1, entitled "Hot air self-circulation cleaning and anti-blocking method for air preheaters in power plants", discloses an anti-blocking method, which achieves the purpose of clearing blockage by extracting hot primary air and using a jet fan to blow the rotor heating surface. However, no matter which method is used, it is not enough to eradicate the problem of blockage of the rotary air preheater, especially when operating in a high SO3 flue gas environment, the frequency and situation of blockage of the rotary air preheater are even worse, so it is necessary to make large-scale adjustments to the existing process lines and back-end equipment. Therefore, it is necessary to propose a system that can completely solve the problem of air preheater blockage without making a lot of changes to the existing process lines. Utility Model Content

[0004] One purpose of the utility model is to provide a rotary air preheater system to prevent ammonium bisulfate from clogging, which integrates conventional warm air measures and heat circulation measures into a pre-air preheater, transfers the risk of clogging to the pre-air preheater, and performs clearing work at any time by adjusting the temperature of hot smoke entering the pre-air preheater.

[0005] In order to achieve these purposes and other advantages according to the utility model, according to one aspect of the utility model, the utility model provides an anti-ammonium bisulfate plugging rotary air preheater system, which includes:

[0006] The rotary air preheater is internally divided into a first hot smoke compartment and at least one first temperature-increasing compartment, and the hot smoke passing through the first hot smoke compartment exchanges heat with the airflow passing through the first temperature-increasing compartment;

[0007] A pre-type air preheater, wherein the pre-hot smoke compartment and the pre-heating compartments corresponding to the number of the first heating compartments are internally divided, and the hot smoke passing through the pre-hot smoke compartments performs heat exchange with the airflow in the pre-heating compartments;

[0008] The hot smoke generated by the hot smoke exhaust device of the upstream process is passed into the first hot smoke sub-chamber through the hot smoke main pipe, then passed into the front hot smoke sub-chamber through the hot smoke exhaust main pipe, and then discharged to the downstream flue gas treatment device. The hot smoke main pipe and the hot smoke exhaust main pipe are connected with an openable and closable hot smoke diversion main pipe;

[0009] The airflow blown in by the cold air blower enters the pre-heating sub-chamber through the pipeline for the first heating, then passes along the pipeline to the first heating sub-chamber, and is finally discharged to the downstream hot air demanding equipment.

[0010] Preferably, a hot smoke flow meter and a hot smoke shutoff damper door are sequentially provided in the hot smoke guide main pipe along the hot smoke flow direction.

[0011] Preferably, a first thermocouple is provided in the hot smoke exhaust main pipe, and a second thermocouple is provided in the pipe between the front hot smoke compartment and the smoke treatment device.

[0012] Preferably, the first heating sub-compartment includes a primary air sub-compartment and a secondary air sub-compartment, the front heating sub-compartment includes a front primary air sub-compartment and a front secondary air sub-compartment, the cold air fan includes a primary fan and a secondary fan, the hot air demanding equipment includes a first heat-using equipment and a second heat-using equipment, the cold air blown out by the primary fan is connected to the front primary air sub-compartment, the primary air sub-compartment and the first heat-using equipment in sequence through a pipeline, and the cold air blown out by the secondary fan is connected to the front secondary air sub-compartment, the secondary air sub-compartment and the second heat-using equipment in sequence through a pipeline.

[0013] Preferably, the pipeline connecting the primary air compartment and the first heat-consuming device is connected to a hot air main pipeline that can be opened and closed, and the other end of the hot air main pipeline is connected to the pipeline between the secondary air fan and the front secondary air compartment.

[0014] Preferably, the hot smoke exhaust main pipe is branched into a plurality of hot smoke exhaust branch pipes, which are connected to the front hot smoke sub-chamber, each hot smoke exhaust branch pipe is provided with a hot smoke branch pipe baffle door, and the hot smoke diversion main pipe branches into a number of hot smoke diversion branch pipes corresponding to the hot smoke exhaust branch pipes at the pipe behind the hot smoke shut-off baffle door, each hot smoke diversion branch pipe is provided with a diversion branch pipe baffle door, and the hot smoke diversion branch pipe is connected to the pipe of the hot smoke exhaust branch pipe behind the hot smoke branch pipe baffle door.

[0015] Preferably, a hot air shutoff damper door is provided in the hot air main duct, and the duct thereafter branches into hot air branch ducts, the hot air branch ducts are provided with hot air branch dampers, and the second fan duct is connected to each hot air branch duct.

[0016] Preferably, the front hot smoke sub-chamber includes a plurality of hot smoke channels isolated from each other, and the hot smoke exhaust branch pipes correspond to and are connected to the hot smoke channels one by one, wherein the smoke in each hot smoke exhaust branch pipe passes through the corresponding hot smoke channel and is discharged from the front hot smoke sub-chamber.

[0017] The utility model at least has the following beneficial effects:

[0018] First, the utility model adopts the method of pre-type air preheater, so that the cooling of hot smoke containing high amount of SO3 is divided into the first cooling in the rotary air preheater and the second cooling in the pre-type air preheater without affecting the heating of cold air, which completely eliminates the blockage caused by the condensation of ammonium bisulfate that may occur in the rotary air preheater;

[0019] Second, the utility model adopts a pre-air preheater, so that the condensation and solidification stage of ammonium bisulfate occurs inside the pre-air preheater, and by periodically passing high-temperature flue gas directly into the pre-air preheater and stopping the cold air delivery, the dissolution and sublimation of ammonium bisulfate inside the pre-air preheater can be effectively completed without stopping the machine, and the overall efficiency of the system is high and the coal consumption is low.

[0020] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a system diagram of a rotary air preheater system for preventing ammonium bisulfate from clogging in a technical solution of the utility model;

[0022] Figure 2 It is a schematic diagram of the hot smoke channel in the pre-heating compartment of the rotary air preheater system to prevent ammonium bisulfate from clogging in a technical solution of the utility model.

[0023] Legend: 1-rotary air preheater, 11-first hot smoke compartment, 12-first heating compartment, 122-secondary air compartment, 121-primary air compartment, 2-front air preheater, 22-front heating compartment, 21-front hot smoke compartment, 210-hot smoke channel, 221-front primary air compartment, 222-front secondary air compartment, 3-hot smoke exhaust device, 31-hot smoke main pipe, 310-hot smoke exhaust main pipe, 311-hot smoke exhaust branch pipe, 312-hot smoke branch pipe baffle door, 32-hot smoke diversion main pipe, 320-hot smoke diversion branch pipe, 33-hot smoke flow meter, 34-hot smoke shut-off damper door, 321-diversion branch damper door, 35-first thermocouple, 36-differential pressure transmitter, 37-second thermocouple, 38-flue gas treatment device, 4-hot air demand equipment, 41-first heat-using equipment, 42-second heat-using equipment, 5-hot air main duct, 53-hot air branch duct, 530-hot air branch damper door, 51-hot air flowmeter, 52-hot air shut-off damper door, 6-cold air fan, 61-primary fan, 610-primary air outlet damper door, 62-secondary fan, 620-secondary air outlet damper door, 7-blocking section. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods, so that those skilled in the art can implement the invention with reference to the description.

[0025] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0026] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial sources unless otherwise specified; in the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, set, or detachably connected, set, or connected and set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood in specific circumstances. The orientation or position relationship indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0027] like Figure 1~2 As shown, the utility model provides a rotary air preheater system for preventing ammonium bisulfate from clogging, comprising: a rotary air preheater 1, which is internally divided into a first hot smoke compartment 11 and at least one first temperature-raising compartment 12, and the hot smoke passing through the first hot smoke compartment 11 can be heat-exchanged with the airflow passing through the first temperature-raising compartment 12; a pre-type air preheater 2, which is internally divided into a pre-hot smoke compartment 21 and a number of pre-temperature-raising compartments 22 corresponding to the number of the first temperature-raising compartments 12, and the hot smoke passing through the pre-hot smoke compartment 21 can be heat-exchanged with the airflow in the pre-temperature-raising compartment 22; Among them, the hot smoke generated by the hot smoke exhaust device 3 of the upstream process is passed into the first hot smoke sub-chamber 11 through the hot smoke main pipe 31, and then passed into the front hot smoke sub-chamber 21 through the hot smoke exhaust main pipe 310, and then discharged to the downstream flue gas treatment device 38, and the hot smoke main pipe 31 and the hot smoke exhaust main pipe 310 are connected with an openable and closable hot smoke guide pipe 32; the airflow blown by the cold air fan 6 enters the front heating sub-chamber 22 through the pipeline for the first heating, and then passes into the first heating sub-chamber 12 along the pipeline, and then is discharged to the downstream hot air demanding equipment 4.

[0028] like Figure 1~2As shown, the utility model provides a rotary air preheater system for preventing ammonium bisulfate from clogging, comprising: a rotary air preheater 1, which is internally divided into a first hot smoke compartment 11 and at least one first temperature-raising compartment 12, and the hot smoke passing through the first hot smoke compartment 11 can be heat-exchanged with the airflow passing through the first temperature-raising compartment 12; a pre-type air preheater 2, which is internally divided into a pre-hot smoke compartment 21 and a number of pre-temperature-raising compartments 22 corresponding to the number of the first temperature-raising compartments 12, and the hot smoke passing through the pre-hot smoke compartment 21 can be heat-exchanged with the airflow in the pre-temperature-raising compartment 22; Among them, the hot smoke generated by the hot smoke exhaust device 3 of the upstream process is passed into the first hot smoke sub-chamber 11 through the hot smoke main pipe 31, and then passed into the front hot smoke sub-chamber 21 through the hot smoke exhaust main pipe 310, and then discharged to the downstream flue gas treatment device 38, and the hot smoke main pipe 31 and the hot smoke exhaust main pipe 310 are connected with an openable and closable hot smoke guide pipe 32; the airflow blown by the cold air fan 6 enters the front heating sub-chamber 22 through the pipeline for the first heating, and then passes into the first heating sub-chamber 12 along the pipeline, and then is discharged to the downstream hot air demanding equipment 4.

[0029] In the present technical solution, the hot smoke exhaust device 3 can be a device that emits high-temperature SO3-containing gas such as an economizer or an SCR denitrification and dust removal device. A sealing area is provided between the first hot smoke compartment 11 and the first heating compartment 12 in the rotary air preheater 1 to reduce the gas exchange between the two compartments. The rotary air preheater 1 completes the heat exchange between the two compartments through the rotation of the internal rotor. When the high-temperature flue gas passes through the first hot smoke compartment 11, the airflow passing through the first heating compartment 12 has actually been heated by the pre-air preheater 2. The temperature of the high-temperature flue gas after passing through the first hot smoke compartment 11 is lower than that of the first heating compartment 12. The situation where the sub-compartment 12 is directly connected to cold air is relatively high, so that the temperature of the cold end of the first hot smoke sub-compartment 11 is always higher than 190°C. In this temperature environment, ammonium bisulfate will not adhere to the heat transfer element. The pre-type air preheater 2 can be a tube box type, plate type, plate tooth type or other type of air preheater that does not require additional energy consumption. It is divided into a pre-hot smoke sub-compartment 21 and a pre-heating sub-compartment 22 according to spatial isolation. The pre-hot smoke sub-compartment 21 passes through the hot smoke that has been preliminarily cooled, and the pre-heating sub-compartment 22 passes through the cold air blown in by the cold air fan 6. At this time, the solidified ammonium bisulfate is solidified at the cold end of the pre-hot smoke sub-compartment 21.

[0030] In the present technical solution, flowmeters and other monitoring equipment are added to the front-end pipes and rear-end pipes of the front hot smoke compartment 21. The operator determines the blockage in the front air preheater 2 by monitoring the flow rate and pressure difference of the hot smoke passing through the front hot smoke compartment 21. When necessary, the hot smoke guide pipe 32 is opened or partially opened, so that all or part of the hot smoke that has not been cooled down directly passes into the front hot smoke compartment 21, and the amount of cold air entering is adjusted according to the needs. In a short time, the temperature of the cold end of the front hot smoke compartment 21 rises, so that the solidified liquid Or solid ammonium bisulfate is completely vaporized in a short time and discharged into the lower flue gas treatment device 38 along with the hot smoke, and then the hot smoke diversion main pipe 32 is closed, and the whole system returns to normal working state. This unblocking process can be set to be periodic. The duration of this unblocking process is short and the hot smoke can be directly passed into the front hot smoke compartment 21 to complete the unblocking by setting a closing baffle door. The whole system does not need to be shut down, and the whole process does not incur additional cleaning costs. The flue gas treatment device 38 downstream of the system can withstand the periodic short-term rise in flue gas temperature.

[0031] In another technical solution, a hot smoke flow meter 33 and a hot smoke shutoff damper door 34 are sequentially provided in the hot smoke guide main pipe 32 along the hot smoke flow direction. The hot smoke shutoff damper door 34 can adjust or completely isolate the flue gas flow by the degree of opening and closing. The hot smoke shutoff damper door 34 is in a closed state when the system is in normal use, and is opened when the pre-air preheater 2 needs to be cleared.

[0032] In another technical solution, a first thermocouple 35 is provided in the hot smoke exhaust main pipe 310, and a second thermocouple 37 is provided in the pipeline between the front hot smoke compartment 21 and the flue gas treatment device 38. The first thermocouple 35 collects and records the temperature of the hot smoke after cooling through the rotary air preheater 1, providing data guidance for the operator, and the second thermocouple 37 collects and records the temperature of the hot smoke after the second cooling through the front air preheater 2, providing data for the operator when performing blockage clearing operations.

[0033] In another technical solution, a differential pressure transmitter 36 is provided in the pipeline between the front hot smoke compartment 21 and the flue gas treatment device 38 to calculate the air pressure difference. When the air pressure difference collected by the differential pressure transmitter 36 is too large and the cold end temperature of the first hot smoke compartment 11 collected by the first thermocouple 35 meets the temperature requirement, it can be regarded as a blockage in the front hot smoke compartment 21. Before the entire system is put into use, the operator needs to fully analyze the air pressure difference generated when the front air preheater reaches the blockage standard based on the parameters of each device in the system, and find out when the air pressure difference reaches a certain value and the hot smoke shut-off damper door 34 needs to be opened to allow the hot smoke to pass into the front hot smoke compartment 21 for clearing the blockage, so as to reduce the operating consumption of the entire system to a minimum. This air pressure difference is used as the blockage threshold. Whenever the air pressure difference reaches the blockage threshold, the front air preheater 2 is cleared.

[0034] In another technical solution, the first temperature-raising compartment 12 includes a primary air compartment 121 and a secondary air compartment 122, the front temperature-raising compartment 22 includes a front primary air compartment 221 and a front secondary air compartment 222, the cold air fan 6 includes a primary fan 61 and a secondary fan 62, the hot air demand device 4 includes a first heat-using device 41 and a second heat-using device 42, the cold air blown out by the primary fan 61 is connected to the front primary air compartment 221, the primary air compartment 121 and the first heat-using device 41 in sequence through a pipeline, and the cold air blown out by the secondary fan 62 is connected to the front secondary air compartment 222, the secondary air compartment 122 and the second heat-using device 42 in sequence through a pipeline. In this technical solution, the airflow from the primary air compartment 121 can be By setting up a branch pipe to connect with the pipeline from the secondary air fan 62 to the front secondary air compartment 222 to increase the temperature multiple times, the cold air in the primary air compartment 121 that has been heated for the second time can supply hot air to the first heat-using equipment 41 including equipment such as a coal mill, and the cold air in the secondary air compartment 122 that has been heated for the second time or multiple times can supply hot air to the second heat-using equipment 42 such as a burner. The rear end pipelines of the primary air fan 61 and the secondary air fan 62 are respectively provided with a primary air outlet baffle door 610 and a secondary air outlet baffle door 620 that can be opened and closed. The primary air outlet baffle door 610 and the secondary air outlet baffle door 620 control the cold air delivery volume of the primary air fan 61 and the secondary air fan 62 by opening and closing.

[0035] In another technical solution, the pipeline connecting the primary air compartment 121 and the first heat-using equipment 41 is connected to a hot air main pipeline 5 that can be opened and closed, and the other end of the hot air main pipeline 5 is connected to the pipeline between the secondary fan 62 and the front secondary air compartment 222. The airflow blown in by the secondary fan 62 can be heated by passing the hot air that has been heated twice through the hot air main pipeline 5, or the secondary air outlet baffle door 620 can be closed and the hot air main pipeline 5 can be opened to allow the hot air heated for the second time to be directly passed into the front secondary air compartment 222.

[0036] In another technical solution, the hot smoke exhaust main pipe 310 branches into a plurality of hot smoke exhaust branch pipes 311, which are connected to the front hot smoke sub-chamber 21, and each hot smoke exhaust branch pipe 311 is provided with a hot smoke branch pipe baffle door 312. The hot smoke diversion main pipe 32 branches into a number of hot smoke diversion branch pipes 320 corresponding to the hot smoke exhaust branch pipes 311 after the hot smoke shut-off baffle door 34, and each hot smoke diversion branch pipe 320 is provided with a diversion branch pipe baffle door 321. The hot smoke diversion branch pipe 320 is connected to the pipe of the hot smoke exhaust branch pipe 311 after the hot smoke branch pipe baffle door 312. By adjusting the opening or closing of the diversion branch pipe baffle door 321 and the hot smoke branch pipe baffle door 312, the temperature of the hot smoke entering the front hot smoke sub-chamber 21 can be effectively adjusted. Optionally, the hot smoke shut-off baffle door 34 can be kept in a normally open state during the entire system operation process.

[0037] In another technical solution, a hot air shutoff damper door 52 is provided in the hot air main duct 5, and the duct thereafter branches into hot air branch ducts 53, and the hot air branch ducts 53 are provided with hot air branch damper doors 530. The secondary air fan 62 duct is connected to each hot air branch duct 53. By adjusting the opening and closing of the hot air branch damper door 530 and the secondary air outlet damper door 620, the temperature of the hot air entering the front secondary air compartment 222 can be effectively adjusted. When the front air preheater 2 is cleared, the hot air branch damper door 530 and the hot air shutoff damper door 52 are opened, and the cold air delivery volume of the secondary air fan 62 is reduced or closed, so that the cold end temperature of the front hot smoke compartment 21 can be increased more quickly.

[0038] In another technical solution, the front hot smoke compartment 21 includes a plurality of hot smoke channels 210 isolated from each other, and the hot smoke exhaust branch pipes 311 correspond to and are connected with the hot smoke channels 210 one by one, wherein the flue gas in each hot smoke exhaust branch pipe 311 passes through the corresponding hot smoke channel 210 and is discharged from the front hot smoke compartment 21. In this technical solution, the front air preheater 2 adopts a plate air preheater or a tube air preheater, and the interior of the front hot smoke compartment 21 can be divided into a plurality of hot smoke channels 210 that are airtightly isolated from each other according to the pipeline distribution or partitions. Since each hot smoke exhaust branch pipe 311 corresponds to a hot smoke channel 210, the sulfur-containing flue gas sent in by the hot smoke exhaust branch pipe 311 will only block the corresponding hot smoke channel 210. When clearing the front air preheater 2, the operator can choose to clear the hot smoke channel 210 in sequence. For clearing the hot smoke channel 210, when each hot smoke channel 210 is cleared, the hot smoke branch pipe baffle door 312 on its corresponding hot smoke exhaust branch pipe 311 is closed and the corresponding diversion branch pipe baffle door 321 is opened, so that the hot smoke that has not been cooled by the rotary air preheater directly enters the hot smoke channel 210, and the blocked section 7 in the hot smoke channel 210 is liquefied and evaporated under high temperature. Since the hot smoke channels 210 other than this hot smoke channel 210 still pass through the cooled hot smoke, the temperature of the flue gas entering the flue gas treatment device 38 and the back-end equipment only increases slightly, and will not affect the back-end equipment. After the hot smoke channel 210 is cleared, the corresponding hot smoke branch pipe baffle door 312 is opened and the corresponding diversion branch pipe baffle door 321 is closed, and the subsequent hot smoke channels 210 are cleared in turn.

[0039] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. The rotary air preheater system for preventing ammonium bisulfate from clogging is characterized by: include: The rotary air preheater is internally divided into a first hot smoke compartment and at least one first temperature-increasing compartment, and the hot smoke passing through the first hot smoke compartment exchanges heat with the airflow passing through the first temperature-increasing compartment; A pre-type air preheater, wherein the pre-hot smoke compartment and the pre-heating compartments corresponding to the number of the first heating compartments are internally divided, and the hot smoke passing through the pre-hot smoke compartments performs heat exchange with the airflow in the pre-heating compartments; The hot smoke generated by the hot smoke exhaust device of the upstream process is passed into the first hot smoke sub-chamber through the hot smoke main pipe, then passed into the front hot smoke sub-chamber through the hot smoke exhaust main pipe, and then discharged to the downstream flue gas treatment device. The hot smoke main pipe and the hot smoke exhaust main pipe are connected with an openable and closable hot smoke diversion main pipe; The airflow blown in by the cold air blower enters the pre-heating sub-chamber through the pipeline for the first heating, then passes along the pipeline to the first heating sub-chamber, and is finally discharged to the downstream hot air demanding equipment.

2. The anti-ammonium bisulfate clogging rotary air preheater system according to claim 1, characterized in that: A hot smoke flow meter and a hot smoke shutoff damper door are arranged in sequence along the hot smoke flow direction in the hot smoke guide main pipe.

3. The anti-ammonium bisulfate clogging rotary air preheater system according to claim 1, characterized in that: A first thermocouple is arranged in the hot smoke exhaust main pipe, and a second thermocouple is arranged in the pipe between the front hot smoke compartment and the smoke treatment device.

4. The anti-ammonium bisulfate clogging rotary air preheater system according to claim 1, characterized in that: A differential pressure transmitter is provided in the pipeline between the front hot smoke compartment and the smoke treatment device to calculate the pressure difference.

5. The anti-ammonium bisulfate clogging rotary air preheater system according to claim 1, characterized in that: The first heating sub-compartment includes a primary air sub-compartment and a secondary air sub-compartment, the front heating sub-compartment includes a front primary air sub-compartment and a front secondary air sub-compartment, the cold air fan includes a primary fan and a secondary fan, the hot air demanding equipment includes a first heat-using equipment and a second heat-using equipment, the cold air blown out by the primary fan is connected to the front primary air sub-compartment, the primary air sub-compartment and the first heat-using equipment in sequence through a pipeline, and the cold air blown out by the secondary fan is connected to the front secondary air sub-compartment, the secondary air sub-compartment and the second heat-using equipment in sequence through a pipeline.

6. The anti-ammonium bisulfate clogging rotary air preheater system according to claim 5, characterized in that: The pipeline connecting the primary air compartment and the first heat-consuming device is connected to a hot air main pipeline that can be opened and closed, and the other end of the hot air main pipeline is connected to the pipeline between the secondary air fan and the front secondary air compartment.

7. The anti-ammonium bisulfate clogging rotary air preheater system according to claim 6, characterized in that: The hot smoke exhaust main pipe is branched into a plurality of hot smoke exhaust branch pipes, which are connected to the front hot smoke sub-chamber, each hot smoke exhaust branch pipe is provided with a hot smoke branch pipe baffle door, and the hot smoke diversion main pipe is branched into a number of hot smoke diversion branch pipes corresponding to the hot smoke exhaust branch pipes at the pipe behind the hot smoke shut-off baffle door, each hot smoke diversion branch pipe is provided with a diversion branch pipe baffle door, and the hot smoke diversion branch pipe is connected to the pipe of the hot smoke exhaust branch pipe behind the hot smoke branch pipe baffle door.

8. The anti-ammonium bisulfate clogging rotary air preheater system according to claim 7, characterized in that: A hot air shutoff damper door is provided in the hot air main duct, and the duct thereafter branches into hot air branch ducts, the hot air branch ducts are provided with hot air branch damper doors, and the secondary fan duct is connected to each hot air branch duct.

9. The anti-ammonium bisulfate clogging rotary air preheater system according to claim 8, characterized in that: The front hot smoke sub-chamber includes a plurality of hot smoke passages isolated from each other, and the hot smoke exhaust branch pipes correspond to and are connected with the hot smoke passages one by one, wherein smoke in each hot smoke exhaust branch pipe passes through the corresponding hot smoke passage and is discharged from the front hot smoke sub-chamber.

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