Dedusting ammonium sulfate induced draft fan and control system thereof

Abstract

The utility model relates to the technical field of induced draft fan structures, in particular to a dust-removing ammonium sulfate induced draft fan and a control system of the dust-removing ammonium sulfate induced draft fan. The number of the spray heads is at least three; an air inlet is formed in one end face of the machine shell. Any spray head is arranged towards the air inlet of the machine shell; any spray head is arranged towards the inner side surface of the machine shell; and any spray head is arranged towards the impeller. The problems that after an existing ammonium sulfate induced draft fan works for a long time, ammonium sulfate dust can be attached to a machine shell and an impeller, then dynamic balance of the induced draft fan is damaged, vibration becomes large, sound is abnormal, finally the fan is damaged, and normal operation of ammonia process desulfurization is affected are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of induced draft fan structures, in particular to an ammonium sulfate induced draft fan for dust removal and a control system thereof. Background Art

[0002] An induced draft fan is a mechanical device used for ventilation, air exchange and exhaust, usually installed on the top or wall of buildings, factories, mines, tunnels and other places. It drives the impeller to rotate through a motor to generate strong wind, sucking air from the outdoors or other areas into the interior, and then transporting the air to the area that needs ventilation or exhaust through air ducts or pipes, thereby achieving the purpose of ventilation, air exchange and exhaust.

[0003] Among them, unlike ordinary industrial fans that compress air, ammonium sulfate induced draft fans work in harsh conditions. When sulfur-containing tail gas from power plants and chemical plants is treated with ammonia desulfurization, it is inevitable that ammonium sulfate dust will adhere to the casing and impeller. After long-term attachment, the dynamic balance of the induced draft fan is destroyed, vibration becomes larger, abnormal sound occurs, and eventually the fan is damaged, affecting the normal operation of the ammonia desulfurization.

[0004] Therefore, an ammonium sulfate induced draft fan for dust removal and its control system came into being. Utility Model Content

[0005] The utility model discloses a dust-removing ammonium sulfate induced draft fan and its control system, which mainly solves the problem that after the existing ammonium sulfate induced draft fan has been working for a long time, ammonium sulfate dust will adhere to the casing and impeller, thereby destroying the dynamic balance of the induced draft fan, causing increased vibration, abnormal sound, and eventually damage to the fan, affecting the normal operation of the ammonia desulfurization process.

[0006] The utility model proposes an ammonium sulfate induced draft fan for dust removal, comprising an impeller, a casing and a nozzle; there are at least three nozzles; an air inlet is opened on one end face of the casing; any of the nozzles is arranged toward the air inlet of the casing; any of the nozzles is arranged toward the inner side surface of the casing; and any of the nozzles is arranged toward the impeller.

[0007] Preferably, it also includes an air supply duct connected to all the nozzles, and the air supply duct is also connected to a cleaning agent and a heater.

[0008] Preferably, any of the air supply ducts is arranged close to the inner top surface of the casing; two of the nozzles are arranged back to back at the free end of the air supply duct, and the two nozzles are arranged vertically toward the impeller and the inner side surface of the casing respectively.

[0009] Preferably, the nozzle arranged toward the air inlet of the casing is arranged vertically toward the center of the current air inlet.

[0010] Preferably, any of the air supply ducts is arranged at the bottom of the casing, and a nozzle arranged at the end of the current air supply duct is arranged toward the inner side of the casing.

[0011] Preferably, a first control valve is provided on the air supply duct along the conveying direction of the heater; and a second control valve is provided on the air supply duct along the conveying direction of the cleaning agent.

[0012] Preferably, a glass sight glass is symmetrically provided at the bottom of the housing along the central axis of the housing.

[0013] Preferably, a drain valve is formed on the bottom of the housing extending outward.

[0014] The utility model also proposes a dust-removing ammonium sulfate induced draft fan control system, comprising a controller, and a motor, a first control valve and a second control valve electrically connected to the controller; the controller inputs a first current or a second current to control the start of the motor to drive the impeller to rotate; the controller controls the start of the first control valve or the second control valve.

[0015] As can be seen from the above, the application of the technical solution provided by the utility model can achieve the following beneficial effects:

[0016] First, the induced draft fan proposed in the utility model is provided with nozzles for the casing, the impeller and the air inlet air guide tube respectively, so as to perform uniform and comprehensive flushing, which can greatly reduce the residual ammonium sulfate dust in the above structure, thereby ensuring the long-term working efficiency of the induced draft fan and the normal operation of the ammonia desulfurization;

[0017] Secondly, the induced draft fan proposed by the utility model is also provided with a warm air duct at the nozzle position, which dries the moisture on the casing, the impeller and the air inlet air guide tube by hot air, thereby avoiding the influence of residual moisture on the induced draft fan;

[0018] Third, the induced draft fan of the utility model is provided with a glass window, which is convenient for the staff to observe the internal flushing and cleaning of the induced draft fan, and choose whether to perform secondary flushing and drying as needed, so as to effectively keep the inside of the induced draft fan clean;

[0019] Fourthly, the induced draft fan of the utility model is provided with a drain valve to timely discharge the residual cleaning liquid inside and keep the inside of the fan casing dry and clean;

[0020] Fifth, in the induced draft fan control system proposed in the utility model, the controller can output a first current for driving the normal operation of the motor, and can also output a second current for keeping the impeller rotating at a low speed when spraying the cleaning liquid, thereby improving the cleaning effect of the nozzle on the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 This is a schematic diagram of the side structure of the induced draft fan in Example 1 of the utility model;

[0023] Figure 2 It is a partial structural schematic diagram of the induced draft fan in Example 1 of the utility model;

[0024] Figure 3 This is a flow chart of the control system in Example 2 of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] After the existing ammonium sulfate induced draft fan has been working for a long time, ammonium sulfate dust will adhere to the casing and impeller, thereby destroying the dynamic balance of the induced draft fan, causing increased vibration, abnormal sound, and eventually damage to the fan, affecting the normal operation of the ammonia desulfurization process.

[0027] Example 1

[0028] like Figure 1 and Figure 2 As shown, in order to solve the above problems, the present embodiment proposes a dust-removing ammonium sulfate induced draft fan, which includes an impeller 10, a casing 20 and a nozzle 30; there are at least three nozzles 30; an air inlet 40 is opened on one end face of the casing 20; any nozzle 30 is arranged toward the air inlet 40 of the casing 20; any nozzle 30 is arranged toward the inner side surface of the casing 20; any nozzle 30 is arranged toward the impeller 10.

[0029] Preferably, six nozzles 30 are provided in this embodiment, of which four nozzles 30 are used to flush the induced draft fan casing 20 and are evenly arranged in four directions in the same plane, and the other two nozzles 30 flush the impeller 10 and the air guide tube of the air inlet 40 of the induced draft fan, ensuring that all areas of the induced draft fan can be flushed and covered.

[0030] Preferably, in this embodiment, the end surface of the casing 20 provided with the air inlet 40 should be the end surface away from the main structure of the induced draft fan.

[0031] In this embodiment, the nozzle 30 can spray cleaning liquid to the casing 20, the impeller 10 and the air duct of the air inlet 40 respectively, so as to clean the ammonium sulfate dust remaining on the casing 20, the impeller 10 and the air duct of the air inlet 40, thereby avoiding damage to the induced draft fan caused by the ammonium sulfate dust.

[0032] More specifically, it also includes an air supply duct 50 connected to all the nozzles 30, and the air supply duct 50 is also connected to a cleaning agent and a heater.

[0033] Preferably, in this embodiment, the air supply duct 50 is connected to a cleaning agent, which can be achieved by connecting a storage barrel with the cleaning agent, and the opening of the storage barrel should also be connected to an extraction device to enable the cleaning agent in the storage barrel to be extracted and transported along the air supply duct 50, and then sprayed out from each nozzle 30 to act on the casing 20, the impeller 10 and the air guide tube of the air inlet 40.

[0034] Preferably, in this embodiment, the cleaning agent may be clean water or a cleaning agent with a dissolving function.

[0035] Preferably, the air supply duct 50 in this embodiment is also connected to a heater, preferably 60° C. warm air, to avoid the problem of the fan being deformed by heat due to too high a temperature, or the problem of not achieving a drying effect due to too low a temperature.

[0036] Preferably, the heater in this embodiment may use a heater compressor to deliver the compressed warm air through the air supply duct 50, thereby improving the heater's drying effect on the housing 20, the impeller 10 and the air guide tube of the air inlet 40.

[0037] In this embodiment, a cleaning agent is connected and can be sprayed toward a set position through an air supply duct 50 and a nozzle 30, so that the ammonium sulfate dust slides down with the cleaning agent, and then warm air is delivered by a heater to dry the cleaning agent remaining on the induced draft fan, thereby ensuring the dryness inside the induced draft fan and preventing the ammonium sulfate dust from agglomerating in the induced draft fan due to a humid environment.

[0038] More specifically, any air supply duct 50 is arranged near the inner top surface of the casing 20; two nozzles 30 are arranged back to back at the free end of the air supply duct 50, and the two nozzles 30 are arranged vertically toward the impeller 10 and the inner side surface of the casing 20 respectively.

[0039] Preferably, in this embodiment, the two nozzles 30 disposed opposite to each other at the end of the air supply duct 50 are staggered.

[0040] More specifically, the nozzle 30 disposed toward the air inlet 40 of the housing 20 is vertically disposed toward the center of the air inlet 40 .

[0041] Preferably, the spray head 30 currently arranged vertically toward the center of the air inlet 40 actually sprays and cleans the shaft seal end cover.

[0042] Preferably, in this embodiment, a nozzle 30 arranged toward the inner side of the casing 20 is also arranged on the same horizontal plane as the nozzle 30 currently arranged toward the air inlet 40, and the nozzle 30 arranged toward the casing 20 is located on both sides of the symmetrical nozzle 30 currently arranged toward the air inlet 40.

[0043] More specifically, any air supply duct 50 is disposed at the bottom of the housing 20 , and the nozzle 30 disposed at the end of the current air supply duct 50 is disposed toward the inner side of the housing 20 .

[0044] Preferably, the current air supply duct 50 is suspended at the bottom of the casing 20 through support, thereby ensuring the spraying and cleaning effect of the nozzle 30 at the end of the current air supply duct 50 on the inner side of the casing 20.

[0045] More specifically, the nozzle 30 described in this embodiment is a stainless steel fan-shaped nozzle 30, and can spray a fan-shaped water column with a water column of 120 degrees.

[0046] More specifically, a first control valve 61 is provided on the air supply duct 50 along the conveying direction of the heater; and a second control valve 62 is provided on the air supply duct 50 along the conveying direction of the cleaning agent.

[0047] Preferably, in this embodiment, the first control valve 61 and the second control valve 62 are disposed on different air supply ducts 50 .

[0048] Preferably, in this embodiment, the first control valve 61 and the second control valve 62 are both self-controlled valves.

[0049] In this embodiment, the first control valve 61 is used to control whether warm air is delivered, as well as the delivery efficiency of the warm air; the second control valve 62 is used to control whether cleaning agent is delivered, as well as the delivery amount of the cleaning agent; the first control valve 61 and the second control valve 62, which are respectively arranged on different air supply ducts 50, do not affect each other.

[0050] More specifically, at the bottom of the housing 20 , glass windows 70 are symmetrically provided along the central axis of the housing 20 .

[0051] In this embodiment, the glass window 70 allows the staff to observe the cleanliness and drying degree in the induced draft fan, and can choose whether to perform secondary cleaning or secondary drying operations as needed.

[0052] More specifically, a drain valve 80 is formed on the bottom of the housing 20 extending outward.

[0053] Preferably, in this embodiment, the drain valve 80 can be set at the bottom of the casing 20 in a horizontal extension manner, or can be extended at the bottom of the casing 20 in an inclined downward manner to facilitate the outflow of cleaning agents and ammonium sulfate dust.

[0054] Example 2

[0055] like Figure 3 As shown, in order to solve the aforementioned problems, the present embodiment proposes a dust removal induced draft fan control system, comprising a controller 90, and a motor 100, a first control valve 61 and a second control valve 62 electrically connected to the controller 90 respectively; wherein the controller 90 staggers the output of the first current or the second current with different peak values ​​to drive the motor 100 to start; the controller 90 controls the start of the first control valve 61 or the second control valve 62.

[0056] In this embodiment, the controller 90 can control the normal start of the motor 100 through the high-peak first current, that is, the impeller 10 rotates normally to achieve the induced draft effect; when the work is about to end, the controller 90 adjusts the output current to the second current, at which time the motor 100 drives the impeller 10 to run at a low speed of 10%, and at the same time opens the second control valve 62 to facilitate the cleaning agent to be sprayed from the nozzle 30 to the induced draft fan, so as to clean and remove the ammonium sulfate dust remaining on the induced draft fan, and after the cleaning is completed within the preset time, the second control valve 62 is closed, and the first control valve 61 is opened to allow the 60°C warm air to dry the cleaning agent remaining in the induced draft fan, and the first control valve 61 is closed after the preset time of drying, and the controller 90 stops outputting current and starts the output of the first current when waiting for the next control signal.

[0057] In this embodiment, an automatic regulating valve is used to control the water volume and hot air volume. During the flushing process, the fan is maintained at a low speed of 10%, ensuring that all 10 surfaces of the impeller are fully flushed, and the adjustment is convenient and flexible.

[0058] In summary, the present embodiment 1 and embodiment 2 propose a dust-removing ammonium sulfate induced draft fan and its control system, by arranging multiple nozzles in the induced draft fan for spraying cleaning agent, the ammonium sulfate dust remaining on the induced draft fan is cleaned, and warm air drying is provided at the same time, thereby ensuring the cleanliness of the induced draft fan and improving the efficiency of ammonia desulfurization.

[0059] The above-described implementation methods do not constitute a limitation on the protection scope of the technical solution. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-described implementation methods shall be included in the protection scope of the technical solution.

Claims

1. A dust-removing ammonium sulfate induced draft fan, characterized in that: It includes an impeller, a housing and a nozzle; there are at least three nozzles; an air inlet is provided on one end surface of the housing; any of the nozzles is arranged toward the air inlet of the housing; any of the nozzles is arranged toward the inner side surface of the housing; any of the nozzles is arranged toward the impeller; It also includes an air supply duct connected to all the nozzles, and the air supply duct is also connected to a cleaning agent and a heater; Any of the air supply ducts is arranged close to the inner top surface of the casing; two of the nozzles are arranged back to back at the free end of the air supply duct, and the two nozzles are arranged vertically toward the impeller and the inner side surface of the casing respectively.

2. The dust-removing ammonium sulfate induced draft fan according to claim 1, characterized in that: The nozzle arranged toward the air inlet of the casing is arranged vertically toward the center of the current air inlet.

3. The dust-removing ammonium sulfate induced draft fan according to claim 2, characterized in that: Any of the air supply ducts is arranged at the bottom of the casing, and the nozzle arranged at the end of the current air supply duct is arranged toward the inner side of the casing.

4. The dust-removing ammonium sulfate induced draft fan according to claim 3, characterized in that: A first control valve is arranged on the air supply duct along the conveying direction of the heater; and a second control valve is arranged on the air supply duct along the conveying direction of the cleaning agent.

5. The dust-removing ammonium sulfate induced draft fan according to claim 4, characterized in that: A glass sight glass is symmetrically provided at the bottom of the housing along the central axis of the housing.

6. The dust-removing ammonium sulfate induced draft fan according to claim 5, characterized in that: The bottom of the housing extends outward to form a drain valve.

7. A dust removal ammonium sulfate induced draft fan control system, characterized in that: It includes a controller, and a motor, a first control valve and a second control valve electrically connected to the controller; the controller outputs a first current or a second current with different peak values ​​in a staggered manner to drive the motor to start; the controller controls the first control valve or the second control valve to start.

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