Incinerator flue gas dust removal system with anti-blocking function

Abstract

The utility model provides an incinerator flue gas dust removal system with an anti-blocking function, comprising: a dust removal device for intercepting dust in air; the dust storage tank is used for collecting dust; the two ends of the dust conveying pipe are connected with the dust removal device and the dust storage tank respectively, a first valve is arranged on the dust conveying pipe, and the first valve is used for controlling connection and disconnection of the water conveying pipe; the air supply device is used for introducing compressed air into the dust removal device so as to input the intercepted dust into the dust storage tank; the anti-blocking device comprises a second valve and a blowing pipe, the second valve is connected to the dust conveying pipe and located on the side, away from the dust storage tank, of the first valve, one end of the blowing pipe is connected with the air supply device, and the other end of the blowing pipe is connected between the first valve and the second valve. According to the incinerator flue gas dust removal system with the anti-blocking function, the situation that the first valve is not opened and closed in place can be reduced, the ash conveying pipe can be purged, and the situation that the pipeline is blocked by ash materials is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of dust removal system, in particular to a flue gas dust removal system with anti-blocking function for incinerator. BACKGROUND

[0002] The dust removal system in the project often uses a bin pump to realize the collection and pneumatic conveying of dust. During normal operation, the bin pump is kept in communication with the dust removal system, and the dust separated from the gas is collected in the bin pump. When a certain material level is reached, the bin pump is disconnected from the dust removal system, and the downstream dust storage tank is connected through a valve switch. The inside of the bin pump is pressurized by compressed air, and the dust is conveyed from the pipeline to the downstream dust storage tank.

[0003] Currently, there are two ways to control the bin pump dust conveying. One is material level control, which triggers the subsequent dust conveying action when the bin pump collects dust to a certain material level. The other is time control, which triggers the bin pump operation once after a round of bin pump operation without triggering the material level control within a certain time. However, in actual operation, the outlet valve on the dust conveying pipeline often fails to open and close due to the accumulation of dust, resulting in abnormal pressure of the bin pump and failure of dust conveying. Occasionally, the dust conveying pipeline is also blocked, which brings great hidden dangers to the overall process operation and safety production. SUMMARY

[0004] In view of the above-mentioned shortcomings of the related art, the purpose of the present application is to provide a flue gas dust removal system with anti-blocking function for incinerator, which is used to reduce the situation of dust blocking in the pipeline to avoid the failure of dust conveying.

[0005] To achieve the above-mentioned purposes and other related purposes, the present application provides a flue gas dust removal system with anti-blocking function for incinerator, which comprises: a dust removal device for trapping dust in the air; a dust storage tank for collecting dust; a dust conveying pipe connected to the dust removal device and the dust storage tank at both ends, wherein a first valve is arranged on the dust conveying pipe to control the opening and closing of the dust conveying pipe; a gas supply device for supplying compressed air to the dust removal device to input the trapped dust into the dust storage tank; an anti-blocking device comprising a second valve and a blowing pipe, wherein the second valve is connected to the dust conveying pipe and located on the side of the first valve away from the dust storage tank, one end of the blowing pipe is connected to the gas supply device, and the other end of the blowing pipe is connected between the first valve and the second valve. When the dust is conveyed to the dust storage tank, the second valve is closed and the first valve is opened, and the gas supply device supplies compressed air to the dust conveying pipe through the blowing pipe to clean the dust in the dust conveying pipe.

[0006] Optionally, the air supply device supplies compressed air into the ash conveying pipe in a pulse mode.

[0007] Optionally, the dust removal device comprises a dust collector and a bin pump, the dust collector and the bin pump are connected through a downpipe, the dust collector is used for intercepting dust in air, a conical feed valve is arranged on the downpipe, the bin pump is used for collecting the intercepted dust, the bin pump is connected with the air supply device, the air supply device supplies compressed air into the bin pump to convey the dust to the dust storage tank.

[0008] Optionally, a pre-closing stopcock valve is further arranged on the downpipe, and the pre-closing stopcock valve is arranged between the conical feed valve and the dust collector.

[0009] Optionally, the air supply device is connected with the downpipe to blow off the dust accumulated in the downpipe.

[0010] Optionally, an air venting pipeline is further arranged between the bin pump and the dust collector, and a switch valve is arranged on the air venting pipeline.

[0011] Optionally, the dust removal device comprises a ring-shaped nozzle, the ring-shaped nozzle is arranged on the ash conveying pipe and located at one end of the ash conveying pipe close to the bin pump, the ring-shaped nozzle is connected with the air supply device, and the ring-shaped nozzle is used for assisting in ash conveying.

[0012] Optionally, the air supply device comprises an air-water separator and an air source distributor, the air-water separator and the air source distributor are connected, the air-water separator is used for filtering water in air, and the air source distributor is used for distributing the filtered air source into different air paths, and the air source distributor is connected with the bin pump and the blow-off pipe.

[0013] As described above, the incinerator flue gas dust removal system with the anti-blocking function has the following beneficial effects: after each ash conveying is completed, the second valve is closed, the first valve is opened, compressed air is used to blow off the ash conveying pipe including the first valve for a period of time to prevent blocking, and the first valve is closed after the blow-off is completed. The anti-blocking device can greatly reduce the situation that the old valve cannot be opened and closed in place, and can also blow off the pipeline to reduce the situation that the ash in the pipeline is blocked. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 A schematic diagram of the incinerator flue gas dust removal system with the anti-blocking function in the embodiment of the present application is shown.

[0015] Figure 2 A flowchart of the fault detection method for the incinerator flue gas dust removal system in the embodiment of the present application is shown.

[0016] ELEMENT NUMBER EXPLANATION

[0017] 1. dust collector; 2. bin pump; 3. dust storage tank; 4. pre-closing plug valve; 5. conical feed valve; 6. first valve; 7. vent line; 8. annular nozzle; 9. gas-water separator; 10. gas source distributor; 11. second valve; 12. injection pipe. DETAILED DESCRIPTION

[0018] Those skilled in the art can easily understand other advantages and functions of the present application from the disclosure of the specification. The present application can also be implemented or applied in other different embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application.

[0019] As in the detailed description of the embodiments of the present application, the sectional views showing the structures of the devices are partially enlarged without the general scale for the convenience of explanation, and the schematic views are only examples which should not limit the scope of protection of the present application herein. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture.

[0020] For the convenience of description, spatial relationship words such as "under", "below", "lower", "underneath", "above", "upper" and the like can be used herein to describe the relationship of one element or feature to other elements or features shown in the drawings. It will be understood that these spatial relationship words are intended to include other orientations of the device in use or operation in addition to the orientations depicted in the drawings. In addition, when a layer is referred to as "between" two layers, it can be the only layer between the two layers, or one or more intervening layers can also be present. "Between" is used herein to include both end point values.

[0021] In the context of the present application, the structure in which the first feature is "on" the second feature can include the embodiment in which the first and second features are formed in direct contact, and can also include the embodiment in which another feature is formed between the first and second features, so that the first and second features can not be in direct contact.

[0022] It should be noted that the diagrams provided in the embodiments herein only schematically illustrate the basic concepts of the present application, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The actual implementation of each component can be a random change in shape, number and proportion, and the layout pattern of the components can also be more complex.

[0023] As Figure 1As shown, the embodiment discloses a dust removal system for preventing blockage, which implements the above method, and comprises a dust remover 1, a bin pump 2, a gas supply device, a blockage prevention device and a dust storage tank 3. The dust remover 1 is connected with the bin pump 2 through a discharging pipe. The dust remover 1 is used for intercepting flue gas generated by an incinerator. The dust intercepted by the dust remover 1 can enter the bin pump 2 through the discharging pipe.

[0024] A pre-closing cock valve 4 and a conical feeding valve 5 are connected in series on the discharging pipe. The conical feeding valve 5 can be used for adjusting the flow of dust feeding. Both the valves are used for controlling the opening and closing of the discharging pipe. When the dust in the bin pump 2 is transported to the dust storage tank 3, the air tightness of the discharging pipe can be ensured by arranging the two valves on the discharging pipe, so as to prevent the dust from flowing back to the dust remover 1.

[0025] A material level meter is arranged in the bin pump 2. The material level meter is used for detecting the material level in the bin pump 2. The bin pump 2 is connected with the dust storage tank 3 through a dust conveying pipe. A first valve 6 which can be opened and closed is arranged on the dust conveying pipe. The dust in the bin pump 2 can enter the dust storage tank 3 through the dust conveying pipe. The blockage prevention device is connected between the dust conveying pipe and the gas supply device. The blockage prevention device is used for blowing air into the dust conveying pipe to dredge the pipe.

[0026] A vent pipe 7 is further connected between the bin pump 2 and the dust remover 1. An on-off valve is arranged on the vent pipe 7. The vent pipe 7 is used to make the air pressure between the bin pump 2 and the dust remover 1 the same, so as to ensure that the dust in the dust remover 1 can be transported to the bin pump 2. When the dust in the bin pump 2 is transported to the dust storage tank 3, the on-off valve on the vent pipe 7 is closed, so as to avoid the dust flowing back to the dust remover 1.

[0027] An annular nozzle 8 is arranged on the end of the dust conveying pipe close to the bin pump 2. The annular nozzle 8 is connected with the gas supply device. The annular nozzle 8 can provide blowing gas to assist dust conveying during the dust conveying process.

[0028] During the implementation of the dust removal system, when the dust collected in the bin pump 2 reaches the material level set by the material level meter, the material level meter sends a signal. At this time, the gas supply device inputs compressed air into the bin pump 2, so as to transport the dust in the bin pump 2 to the dust storage tank 3. After the bin pump 2 completes dust conveying once, the blockage prevention device blows to the dust conveying pipe, so as to clean the dust.

[0029] The gas supply device comprises a gas-water separator 9 and a gas source distributor 10. The gas-water separator 9 is used for filtering water in the air. The gas source distributor 10 is used for distributing the gas source into different gas paths. In the embodiment, the gas source distributor 10 is configured with three gas paths. The first gas path is connected with the discharging pipe, which can be used for blowing the dust accumulated in the discharging pipe, so as to prevent the phenomena such as bridging and caking. The second gas path is connected with the bin pump 2, which is used for providing gas to the bin pump 2 for dust conveying. The third gas path is connected with the annular nozzle 8, which is used for assisting the annular nozzle 8 in dust conveying.

[0030] In the embodiment, the anti-blocking device comprises a second valve 11 and a blowing pipe 12. The second valve 11 is connected to the ash conveying pipe and located on the side of the first valve 6 away from the dust storage tank 3. One end of the blowing pipe 12 is connected to the air supply device, and the other end of the blowing pipe 12 is connected between the first valve 6 and the second valve 11.

[0031] When the anti-blocking device is blowing, the second valve 11 is closed and the first valve 6 is opened. The air supply device sends compressed air into the ash conveying pipe through the blowing pipe 12 to pulse blow the ash conveying pipe. After the blowing is completed, the first valve 6 is closed. In this way, the situation that the first valve 6 cannot be opened or closed to the position can be greatly reduced, and the pipeline can be purged to reduce the situation that the ash in the pipeline is blocked.

[0032] The embodiment provides a fault detection method for a waste incinerator flue gas dust removal system. An operator can intuitively determine the fault condition of the dust removal system by using the fault detection method. The specific steps of the method include:

[0033] S1, based on two kinds of operation logic of the bin pump 2, the running rounds of the bin pump 2 under the two kinds of operation logic are counted respectively.

[0034] Specifically, in the dust removal system, the dust collector 1 is used to intercept the flue gas of the waste incinerator. The dust in the dust collector 1 usually enters the bin pump 2 to realize the collection and pneumatic conveying of the dust. The bin pump 2 conveys the collected dust to the dust storage tank 3. At present, the operation of the bin pump 2 is controlled by two kinds of operation logic. One is the material level operation logic. The single operation of the bin pump 2 is based on the material level control. That is, a material level meter is arranged in the bin pump 2. If the bin pump 2 collects dust to a certain material level, the subsequent ash conveying action is triggered by the signal of the material level meter. During the ash conveying process, the ash conveying condition is judged by observing the internal pressure of the bin pump 2. In the initial stage of ash conveying, a large amount of dust is collected in the bin pump 2. After the compressed air is connected, the internal pressure of the bin pump 2 gradually rises, and the dust is gradually conveyed to the rear dust storage tank 3 through the ash conveying pipe. When the internal pressure of the bin pump 2 rises to a certain pressure (≤1.5 bar), the pressure gradually decreases with the decrease of the dust in the bin pump 2. When the internal pressure of the bin pump 2 decreases to a set value (0.4 bar-0.5 bar), a delay time (5 s-40 s) is set, then the compressed air valve is closed, and after the internal pressure of the bin pump 2 decreases to 0 bar, the ash conveying valve is closed, completing a round of bin pump 2 operation. The bin pump 2 is reconnected to the dust collector 1 to collect dust and start the next round of operation.

[0035] The other ash conveying logic is the time operation logic. The single operation of the bin pump 2 is based on the unit time. If the bin pump 2 operation triggered by the material level control is not triggered within a set time after a round of bin pump 2 operation, the bin pump 2 operation controlled by the time is performed.

[0036] The number of cycles of the bin pump 2 under the control of the two different operation logics is different. For example, under the control of the material level operation logic, the operation cycle of the bin pump 2 is 40 minutes per cycle, and the total number of cycles per day is 36 cycles. Under the control of the time operation logic, the operation cycle of the bin pump 2 is 2 hours per cycle, and the total number of cycles per day is 12 cycles. It can be understood that the operation cycle of the bin pump 2 per cycle is different in different process sections, and therefore the total number of cycles per day of the bin pump 2 is also different.

[0037] By counting the number of cycles of the bin pump 2 per day, the running condition of the bin pump 2 under normal state can be understood, so as to determine whether the bin pump 2 has a fault through the number of cycles.

[0038] S2, setting the upper limit and the lower limit of the number of cycles of the bin pump 2 based on the number of cycles of the bin pump 2 under the two operation logics.

[0039] Under different operation logics, the number of cycles of the bin pump 2 is different, at this time, the lower limit of the number of cycles of the bin pump 2 is set according to the time operation logic of the bin pump 2, that is, the lower limit of the number of cycles of the bin pump 2 per day is 12 times; under the normal operation of the bin pump 2, the dust collection amount in the bin pump 2 is large, and under normal circumstances, the operation cycle of the bin pump 2 is less than the cycle under the control of the time operation logic, so the daily cycle under the control of the time operation is taken as the lower limit of the daily cycle. At the same time, the upper limit of the number of cycles of the bin pump 2 is set according to the material level operation logic of the bin pump 2, that is, the upper limit of the number of cycles of the bin pump 2 per day is 36 times.

[0040] S3, if the number of cycles of the bin pump 2 is less than or equal to the lower limit or exceeds the upper limit, a fault alarm is given.

[0041] Specifically, due to the large dust collection amount in the bin pump 2, under normal circumstances, the number of cycles of the bin pump 2 should be greater than the lower limit requirement of the bin pump 2, if the actual number of cycles of the bin pump 2 reaches the lower limit of the bin pump 2, it indicates that the bin pump 2 has a fault at this time.

[0042] If the bin pump 2 is operated too frequently and exceeds the upper limit requirement, it indicates that the bin pump 2 has a fault, and troubleshooting is also needed.

[0043] S4, troubleshooting the fault based on the number of cycles of the bin pump 2 when the alarm is given.

[0044] Specifically, when the bin pump 2 has a fault, the number of cycles of the bin pump 2 reaches the lower limit or exceeds the upper limit requirement, if the number of cycles of the bin pump 2 is less than or equal to the lower limit, the troubleshooting items include bin pump 2 material level meter fault, dust collector 1 discharge port material stacking condition and dust conveying pipeline blockage condition. If the material level meter fails, the material level meter cannot measure the material level and cannot send a signal in time to trigger the subsequent dust conveying action; if the dust collector 1 discharge port is stacked, the dust cannot enter the bin pump 2, at this time, the material level meter cannot accurately measure the material level, and also cannot send a signal in time to trigger the subsequent dust conveying action.

[0045] If the number of operation cycles of the bin pump 2 exceeds the upper limit, the troubleshooting items include bin pump 2 level meter failure and air tightness of the ash conveying system.

[0046] In the embodiment, a single operation cycle of the bin pump 2 includes an ash conveying stage and a jetting anti-blocking stage, the ash conveying stage refers to conveying dust through the ash conveying pipe to the dust storage tank 3 based on the operation logic of the bin pump 2, and the jetting anti-blocking stage refers to jetting dust in the ash conveying pipe after the ash conveying stage ends.

[0047] When the dust in the bin pump 2 needs to be cleaned, compressed air is usually first input into the bin pump 2 to convey the dust to the dust storage tank 3. Since the ash conveying pipe is often used to convey dust, dust is usually accumulated in the ash conveying pipe, which may cause the ash conveying pipe to be blocked. In order to reduce the blocking, after the bin pump 2 completes the ash conveying stage, jetting of the dust is performed again to prevent the ash conveying pipe from being blocked. Specifically, in the jetting anti-blocking stage, pulse blowing is used to jet the dust in the ash conveying pipe. The high frequency and high pressure characteristics are used to remove residual ash in the pipe. The time interval between the two jettings is given according to the compressed air pressure, so that each jetting can be performed at the highest pressure. The duration of the jetting is determined according to the jetting effect. If it is found that there is ash blocking in the rear-end ash conveying pipe, the jetting time can be appropriately prolonged.

[0048] Since the bin pump 2 uses pneumatic ash conveying, a higher pressure is required for conveying. During the ash conveying process, the pressure in the bin pump 2 needs to be first increased, and then the valve on the rear-end ash conveying pipe is opened, so that the ash is conveyed to the dust storage tank 3 together with the airflow. When the ash conveying system has a leakage point, the pressure in the bin pump 2 cannot be normally increased, the ash cannot be fluidized, and part of the ash will remain in the bin pump 2. The effective volume of the bin pump 2 is reduced, the conveying effect is deteriorated, and even a complete failure of the ash conveying may occur. The program detects that the pressure is reduced to zero during the operation process, and then considers that the ash conveying is completed, and the next feeding cycle is started. At this time, there is still a large amount of ash in the bin pump 2, and the level meter signal is triggered soon, and the next ash conveying cycle is started, thereby causing the operation cycle to be frequent.

[0049] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A flue gas dust removal system for incinerators with anti-clogging function, characterized in that, The dust removal device is used for intercepting dust in air. The dust storage tank is used for collecting dust. The dust conveying pipe is connected with the dust removal device and the dust storage tank respectively. The air supply device is used for supplying compressed air to the dust removal device to input the intercepted dust into the dust storage tank. The anti-blocking device comprises a second valve and a blowing pipe. The air supply device supplies compressed air to the dust conveying pipe in a pulse mode.

2. The incinerator flue gas dust removal system with anti-blocking function according to claim 1, characterized in that: The dust removal device comprises a dust collector and a bin pump.

3. The smoke dust removal system of incinerator with anti-blocking function according to claim 1, characterized in that: The dust removal device comprises a ring-shaped nozzle.

4. The smoke dust removal system of incinerator with anti-blocking function according to claim 3, characterized in that: The air supply device comprises a gas-water separator and a gas source distributor.

5. The smoke dust removal system of incinerator with anti-blocking function according to claim 3, characterized in that: ​ 6. The smoke dust removal system of incinerator with anti-blocking function according to claim 3, characterized in that: ​ 7. The smoke dust removal system of incinerator with anti-blocking function according to claim 3, characterized in that: ​ 8. The smoke dust removal system of incinerator with anti-blocking function according to claim 3, characterized in that: ​

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