CN108465437B - Tower-type granulation tail gas dust removal device and dust removal method thereof - Google Patents
Tower-type granulation tail gas dust removal device and dust removal method thereof Download PDFInfo
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- CN108465437B CN108465437B CN201810534428.2A CN201810534428A CN108465437B CN 108465437 B CN108465437 B CN 108465437B CN 201810534428 A CN201810534428 A CN 201810534428A CN 108465437 B CN108465437 B CN 108465437B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
- B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/04—Cleaning filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring
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Abstract
The invention belongs to a tower type granulation tail gas dust removal device and a dust removal method thereof; the device comprises a mechanical part and a control part, wherein the mechanical structure part comprises a granulation tower, the top of the granulation tower is communicated with a dust removing system, the dust removing system comprises a dust removing shell, a cloth bag dust removing area is arranged in the dust removing shell, a cleaning area is arranged at the upper part of the cloth bag dust removing area, a cloth bag dust removing device is arranged in the cloth bag dust removing area, a pulse ash removing device is arranged on the dust removing shell at the top of the cloth bag dust removing device, and a plurality of induced fans are arranged on the circumference of the top of the dust removing shell; the control part comprises a PLC control system, wherein the signal input end of the PLC control system is respectively connected with the first pressure sensor, the second temperature sensor and the second pressure sensor, and the signal output end of the PLC control system is respectively connected with the induced draft fan and the pulse ash cleaning device; can effectively solve the problems of tailing and short operation time of cloth bag dust removing equipment, and reduce the concentration and dust content of the dust-containing gas at the outlet to 10mg/Nm 3 The advantages are as follows.
Description
Technical Field
The invention belongs to the technical field of granulation tail gas dust removal, and particularly relates to a tower type granulation tail gas dust removal device and a dust removal method thereof.
Background
Up to the present, the national nitrogen fertilizer productivity reaches more than about 8000 ten thousand tons, and domestic large, medium and small urea enterprises basically adopt two kinds of prilling towers for urea granulation, namely a natural ventilation prilling tower and a mechanical ventilation prilling tower. The urea granulation is that molten urea is sprayed and granulated on the top of a granulation tower through a rotary spray head, and is subjected to countercurrent contact with cold air sent from the bottom of the tower, and three stages of liquid particle cooling and solid particle cooling are carried out after the liquid urea is crystallized.
In the granulation process, part of urea dust is generated due to the spraying of a granulation nozzle and the chemical decomposition and resynthesis of urine, and the part of urea dust enters the top of the tower along with cold air, and is discharged from the top of the granulation tower. Roughly counting that the dust generated by each 1 ton of urea is about 1.2-2.0 kg, and calculating by a urea prilling tower with a annual yield of 50 ten thousand tons, if part of urea powder is not well collected, the urea prilling dust is 600t per year, so-called urea prilling dust, or urea, which is not recovered, is not only lost, but also negatively affects the health of personnel and the surrounding environment. The existing prilling tower dust recovery mainly adopts a water washing dust removing device, utilizes the characteristic that urea is easy to dissolve in water, arranges various fillers at the top of the prilling tower, and the functions of the fillers mainly include two kinds, one kind of fillers is used for enlarging the contact area of gas and liquid, and the other kind of fillers is used for collecting liquid in gas, so that the dust concentration and liquid drops in the discharged gas are reduced.
However, the water washing dust removing device mainly has the following problems: (1) the dust removal efficiency is low. The water washing dust removing mainly comprises the steps of settling urea powder dissolved in water under the action of gravity, intercepting fog drops which are not settled by filler, and adopting a mode of arranging multistage filler for multistage flushing to improve the dust removing and demisting efficiency, but only passing waterDust-cleaning and demisting device, the general smoke emission concentration is 50mg/m 3 About, it is difficult to reach 10mg/m 3 The following effects. (2) packing clogging. The urea powder is dissolved in water, if the urea powder is intercepted by the filler, the urea powder is not washed by the water in time, or dead angle areas are not washed for a long time, more urea powder is accumulated, crystals are formed on the filler, the filler is gradually blocked, system resistance is increased, when the resistance reaches a certain value, the filler is lifted by gas, gas short circuit is caused, and the dust and mist removing efficiency of the filler is reduced. The ventilation of the prilling tower is affected after the filler is blocked, so that the prilling cooling effect of the prilling tower is poor. (3) the discharged gas is carried with liquid. The filling flushing mode is generally lower flushing or upper flushing, the filling is flushed from top to bottom, the gas flow direction and the liquid flow direction are reversed, and part of flushing water is easily taken away by the gas when the flushing water does not reach the filling yet; the flushing water is flushed from bottom to top, and the upper layer of the filler is not easy to flush cleanly. The water-washing dust removing device is arranged at the top of the granulating tower with the height of about 90m, so that the distance between gas and a discharge outlet after water-washing dust removing is only about 3m, the gas residence time is short, liquid drops in the gas have no sedimentation space, and the top axial flow fan has high suction force, so that the condition of carrying liquid by the discharged gas is more serious, and the urea powder is very soluble in water, so that the carrying liquid by the discharged gas is not only water, but also contains urea powder, and negative influence is caused on the surrounding environment. (4) The tailing of the granulation tower is serious, and the desorption waste liquid of the urea device is generally adopted in the water washing and dust removing process, the temperature is about 30-40 ℃, the special spray head is utilized to atomize the urea device during dust removal, then the urea device contacts dust to achieve the purpose of recycling, and the part of water vapor is discharged into the atmosphere under the action of the induced draft fan to form the tailing.
The problems are caused by factors of the granulation tower and the water-washing dust removing equipment, in order to solve the defects, enterprises try to adopt a cloth bag dust removing mode, but the problems are not successful all the time, and the traditional water-washing dust removing mode is still used; for the reason, taking urea as an example, urea has the characteristics of easy moisture absorption and easy scarring, the mode of utilizing cloth bag type dust removal can be operated in a short time, urea dust is easy to adhere to a cloth bag when the operation time is long, and urea dust cannot be removed by adopting a blowing mode, so that the load of a draught fan is large, the dust removal effect is poor and the dust removal equipment cannot work directly when serious, and particularly the problem is serious due to the influence of factors such as high temperature and high humidity in summer.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the dust-collecting device which has the advantages of simple structure, low investment, reasonable design, capability of effectively solving the problems of tailing and short running time of cloth bag dust-collecting equipment, and capability of reducing the concentration and dust content of dust-containing gas at an outlet to 10mg/Nm 3 The utility model relates to a tower type granulation tail gas dust removal device and a dust removal method thereof.
The object of the invention is achieved in that: the utility model provides a tower granulation tail gas dust collector, this device includes mechanical part and control part, a, mechanical structure part is equipped with the prilling tower of taking the prilling shower nozzle including inside, and the top of prilling shower nozzle is equipped with dust recovery unit, and the prilling tower top is linked together with the dust pelletizing system, the dust pelletizing system includes the dust removal casing, and the inside of dust removal casing is equipped with the sack dust removal district, and the upper portion in sack dust removal district is equipped with the clean district, is equipped with sack dust collector in the sack dust removal district, installs pulse ash removal device on the dust removal casing at sack dust collector top, is equipped with a plurality of induced fans on the top circumference of dust removal casing; b. the control part comprises a PLC control system, wherein the signal input end of the PLC control system is respectively connected with the first pressure sensor, the second temperature sensor and the second pressure sensor, and the signal output end of the PLC control system is respectively connected with the induced draft fan and the pulse ash cleaning device; the first pressure sensor is arranged in the cleaning area, and the second temperature sensor and the second pressure sensor are arranged in the bag-type dust removing area.
Preferably, a first temperature sensor is arranged in the cleaning zone.
Preferably, the dust recovery device comprises a circulating tank arranged at the bottom of the bag-type dust collector, a spray head is arranged at the upper part in the circulating tank, the bottom of the circulating tank is connected with a urea solution tank through a pipeline, and the lower part of the urea solution tank is connected with the spray head through a urea solution pump; the upper part of the urea solution tank is provided with a desalted water supplementing pipeline, and the bottom of the urea solution tank is connected with the urea solution recovery device through a urea solution discharging valve.
Preferably, the urea solution tank is provided with a liquid level meter and a densitometer.
Preferably, the signal input end of the PLC control system is connected with the densimeter, and the signal output end of the PLC control system is connected with the urea solution discharging valve.
Preferably, the induced draft fan is 20 variable frequency induced draft fans, and the maximum frequency of the 20 variable frequency induced draft fans is not more than 50Hz.
A dust removal method of a tower type granulation tail gas dust removal device is characterized by comprising the following steps of: the dust removing method comprises the following steps:
step one: the cold air from the prilling tower exchanges heat with urea solution particles from the prilling spray head to form dust-containing gas;
step two: under the action of an induced draft fan, filtering dust from the dust-containing gas in the first step through a bag-type dust removing device, and enabling clean gas to enter a cleaning zone;
Step three: clean air in the clean room is discharged into the atmosphere through an induced draft fan;
step four: the PLC control system monitors the pressure values and the pressure differences of the cleaning area and the cloth bag dust removing area in real time through the first pressure sensor and the second pressure sensor, and determines the blowing time of the pulse ash removing device through the pressure values and the pressure differences;
step five: the PLC control system monitors the actual temperature in the bag-type dust removing area in real time through a second temperature sensor, and determines the working frequency of the induced draft fan through comparing the actual temperature with the working temperature;
step six: dust of the cloth bag dust collector enters the circulating tank under the blowing action of the pulse ash cleaner;
step seven: desalted water is supplemented in the urea solution tank through a desalted water supplementing pipeline, and the desalted water in the urea solution tank enters the circulating tank in the step six through a urea solution pump and a spray head to be combined with dust to form a dilute urea solution;
step eight: when the density meter detects that the concentration of the dilute urea solution is 10% -40%, a urea solution discharging valve is opened, so that the urea solution in the urea solution tank enters a urea solution recovery device through the urea solution discharging valve to be recovered and reused;
Step nine: after the urea solution enters the urea solution recovery device, closing a urea solution discharge valve, and simultaneously, supplementing desalted water into a urea solution tank through a desalted water supplementing pipeline;
step ten: when the density meter detects that the concentration of the dilute urea solution is not more than 10% -40%, a urea solution pump is started, so that the dilute urea solution enters a circulating tank to continuously dilute the dust falling in the bag-type dust removing device.
In the fourth step, the first pressure sensor monitors the pressure in the cleaning area in real time, and the second pressure sensor monitors the pressure in the bag-type dust removing area in real time; transmitting the data to a PLC control system in real time; the pressure difference between the first pressure sensor and the second pressure sensor is 700Pa to 1200Pa; when the pressure difference between the first pressure sensor and the second pressure sensor is larger than 1200Pa, the PLC control system controls the pulse ash removing device to start, and high-pressure gas is reversely blown to the cloth bag dust removing device through the ejection pipe and the blowing head to remove dust; so as to reduce the pressure difference between the first pressure sensor and the second pressure sensor to be within 700 Pa-1200 Pa.
Preferably, in the fifth step, the second temperature sensor monitors the temperature in the bag-type dust removing area in real time; the temperature in the bag-type dust removing area is 30-60 ℃.
Preferably, when the temperature in the bag-type dust removing area is lower than 30 ℃, the PLC control system controls the frequency of the induced draft fan to be reduced, so that the temperature in the bag-type dust removing area reaches 30-60 ℃; when the temperature in the bag-type dust removing area is higher than 60 ℃, the PLC control system controls the frequency of the induced draft fan to be increased, so that the temperature in the bag-type dust removing area reaches 30-60 ℃.
Tower type granulation tail gas dust removal device and dust removal method thereof manufactured according to the schemeAccording to the method, dust can be effectively prevented from escaping out of the granulating tower by arranging the dust removing system at the top of the granulating tower, the purpose that dust can only circulate in the granulating tower is achieved, and as the induced draft fan is arranged in the dust removing system, the frequency of the induced draft fan can reach 50Hz and far exceeds that of the induced draft device in the water washing dust removing equipment, so that a solid foundation is laid for improving the dust removing efficiency, the dust is removed through the cloth bag dust removing device with extremely high purifying rate under the cooperation of the induced draft fan, and the reduction of the gas dust content at the outlet of the induced draft fan to 10mg/m can be achieved 3 The following ultra-low emission index; the dust recovery device is arranged, so that the dust can be effectively recovered, and the purposes of saving resources and reducing the enterprise cost are achieved; the environment inside the dust removing system can be detected by arranging the first pressure sensor, the second temperature sensor and the second pressure sensor, so that the defect that the cloth bag type dust removing device cannot operate in the granulating system for a long time is overcome; has the advantages of simple structure, less investment, reasonable design, effective solving of the problems of tailing and short running time of cloth bag dust removing equipment, and reducing the concentration and dust content of the dust-containing gas at the outlet to 10mg/Nm 3 The advantages are as follows.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of the control principle of the present invention.
Detailed Description
For a clearer understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals refer to like parts throughout the various views. For simplicity of the drawing, only the parts relevant to the present invention are schematically shown in each drawing, and they do not represent the actual structure thereof as a product.
As shown in fig. 1 and 2, the invention relates to a tower type granulation tail gas dust removal device and a dust removal method thereof, wherein the tower type granulation tail gas dust removal device comprises a mechanical part and a control part, a, the mechanical part comprises a granulation tower 1 with a granulation spray head 2 arranged inside, the top of the granulation spray head 2 is provided with a dust recovery device, the top of the granulation tower 1 is communicated with a dust removal system, the dust removal system comprises a dust removal shell 3, a cloth bag dust removal zone 4 is arranged inside the dust removal shell 3, a cleaning zone 5 is arranged at the upper part of the cloth bag dust removal zone 4, a cloth bag dust removal device 6 is arranged in the cloth bag dust removal zone 4, a pulse ash removal device 7 is arranged on the dust removal shell 3 at the top of the cloth bag dust removal device 6, and a plurality of induced draft fans 8 are arranged on the circumference of the top of the dust removal shell 3;
b. The control part comprises a PLC control system 9, wherein the signal input end of the PLC control system 9 is respectively connected with a first pressure sensor 11, a second temperature sensor 12 and a second pressure sensor 13, and the signal output end of the PLC control system 9 is respectively connected with an induced draft fan 8 and a pulse ash cleaning device 7; the first pressure sensor 11 is arranged in the cleaning zone 5, and the second temperature sensor 12 and the second pressure sensor 13 are arranged in the bag-type dust removal zone 4.
A first temperature sensor 10 is arranged in the cleaning zone 5.
The dust recovery device comprises a circulating tank 20 arranged at the bottom of the bag-type dust collector 6, a spray head 21 is arranged at the upper part in the circulating tank 20, the bottom of the circulating tank 20 is connected with a urea solution tank 18 through a pipeline, and the lower part of the urea solution tank 18 is connected with the spray head 21 through a urea solution pump 16; the upper part of the urea solution tank 18 is provided with a desalted water supplementing pipeline 22, and the bottom of the urea solution tank 18 is connected with a urea solution recovery device 19 through a urea solution discharging valve 17. The urea solution tank 18 is provided with a liquid level meter 14 and a densitometer 15. The signal input end of the PLC control system 9 is connected with the densimeter 15, and the signal output end of the PLC control system 9 is connected with the urea solution discharging valve 17. The induced draft fan 8 is 20 variable frequency induced draft fans, and the maximum frequency of the 20 variable frequency induced draft fans is not more than 50Hz.
The dust removing method of the tower type granulation tail gas dust removing device comprises the following steps:
step one: the cold air from the prilling tower 1 exchanges heat with urea solution particles from the prilling spray head 2 to form dust-containing gas;
step two: under the action of an induced draft fan 8, filtering dust from the dust-containing gas in the first step through a cloth bag dust removing device 6, and enabling clean gas to enter a cleaning zone 5;
step three: clean air in the clean room 5 is discharged into the atmosphere through an induced draft fan 8;
step four: the PLC control system 9 monitors the pressure values and the pressure differences of the cleaning area 5 and the cloth bag dust removing area 4 in real time through the first pressure sensor 11 and the second pressure sensor 13, and determines the blowing time of the pulse ash cleaning device 7 through the pressure values and the pressure differences;
step five: the PLC control system 9 monitors the actual temperature in the bag-type dust removing area 4 in real time through the second temperature sensor 12, and determines the working frequency of the induced draft fan 8 through comparing the actual temperature with the working temperature;
step six: dust of the cloth bag dust collector 6 enters the circulation tank 20 under the blowing action of the pulse ash cleaner 7;
step seven: desalted water is supplemented in the urea solution tank 18 through a desalted water supplementing pipeline 22, and the desalted water in the urea solution tank 18 enters the circulating tank 20 in the step six through the urea solution pump 16 and the spray head 21 to be combined with dust to form a dilute urea solution;
Step eight: when the density meter 15 detects that the concentration of the dilute urea solution is 10% -40%, the urea solution discharging valve 17 is opened, so that the urea solution in the urea solution tank 18 enters the urea solution recovery device 19 through the urea solution discharging valve 17 for recovery and reutilization;
step nine: after the urea solution enters the urea solution recovery device 19, the urea solution discharging valve 17 is closed, and meanwhile, a desalted water supplementing pipeline 22 supplements desalted water into the urea solution tank 18;
step ten: when the densimeter 15 detects that the concentration of the dilute urea solution is not more than 10% -40%, the urea solution pump 16 is started, so that the dilute urea solution enters the circulation tank 20 to continuously dilute the dust falling in the bag-type dust removing device 6.
In the fourth step, the first pressure sensor 11 monitors the pressure in the cleaning area 5 in real time, and the second pressure sensor 13 monitors the pressure in the bag-type dust removing area 4 in real time; and transmitting the data to the PLC control system 9 in real time; the pressure difference between the first pressure sensor 11 and the second pressure sensor 13 is 700 Pa-1200 Pa; when the pressure difference between the first pressure sensor 11 and the second pressure sensor 13 is larger than 1200Pa, the PLC control system 9 controls the pulse ash cleaning device 7 to start, and high-pressure gas reversely blows to the cloth bag dust cleaning device 6 through the ejection pipe and the ejection head to remove dust; so as to reduce the pressure difference between the first pressure sensor 11 and the second pressure sensor 13 to be within 700Pa to 1200 Pa.
In the fifth step, the second temperature sensor 12 monitors the temperature in the bag-type dust removing area 4 in real time; the temperature in the bag-type dust removing area 4 is 30-60 ℃.
When the temperature in the bag-type dust removing area 4 is lower than 30 ℃, the PLC control system 9 controls the frequency of the induced draft fan 8 to be reduced, so that the temperature in the bag-type dust removing area 4 reaches 30-60 ℃; when the temperature in the bag-type dust removing area 4 is higher than 60 ℃, the PLC control system 9 controls the frequency of the induced draft fan 8 to be increased, so that the temperature in the bag-type dust removing area 4 reaches 30-60 ℃.
According to researches, the invention discovers that urea or compound fertilizer dust is adhered to the surface of a cloth bag in a cloth bag dust removing device and has close relation with the environment of the area, such as temperature and humidity, and the cloth bag dust removing device cannot be matched with a prilling tower for dust removal in summer due to the reasons, the temperature has close relation with the environment temperature and the working temperature in the prilling tower, the humidity has direct relation with the environment humidity and desalted water evaporation in a recovery device, and the humidity is expressed as the pressure difference between a dust removing area and a cleaning area in the dust removing system; proved by a great deal of researches and experiments, the optimal working temperature of the granulation tower and the bag-type dust collector is 30-60 ℃ and the pressure difference is 700-1200 Pa; the working temperature and the pressure difference are key points for solving the problem that urea or compound fertilizer dust adheres to the surface of a cloth bag; the invention mainly adjusts the frequency of the induced draft fan, adjusts the internal temperature of the dust removing system through the ventilation speed, and solves the problem of overlarge pressure difference through the blowing of the pulse ash removing device 7, thereby realizing the long-time operation of the dust removing system. It should be noted that the urea solution recovery device 19 in the present invention is a flash tank, a urea solution tank or an ammonia tank for preparing urea or compound fertilizer; the pulse ash cleaning device is provided with equipment such as a high-pressure air storage tank or an air collection tank, and the equipment can be used for blowing to the cloth bag dust cleaning device 6 through a jet pipe and a blowing head and is controlled by the pulse ash cleaning device. The first temperature sensor 10 of the present invention is used to detect the temperature in the cleaning zone 5; in addition, the liquid level meter 14 can be matched with a valve in the desalted water supplementing pipeline 22 to achieve the optimal water supplementing state, and the device can be manually controlled and can also be automatically adjusted by the PLC control system 9.
The invention will now be further described in connection with specific embodiments for a clearer explanation thereof. Specific examples are as follows:
example 1
The utility model provides a tower granulation tail gas dust collector, includes mechanical part and control part, a, mechanical structure part is equipped with the prilling tower 1 of taking prilling sprayer 2 including inside, and the top of prilling sprayer 2 is equipped with dust recovery unit, and prilling tower 1 top is linked together with the dust pelletizing system, the dust pelletizing system includes dust removal casing 3, and the inside of dust removal casing 3 is equipped with sack dust removal district 4, and sack dust removal district 4's upper portion is equipped with clean district 5, is equipped with sack dust collector 6 in sack dust removal district 4, installs pulse ash removal device 7 on the dust removal casing 3 at sack dust collector 6 top, is equipped with a plurality of induced draft fans 8 on the top circumference of dust removal casing 3; b. the control part comprises a PLC control system 9, wherein the signal input end of the PLC control system 9 is respectively connected with a first pressure sensor 11, a second temperature sensor 12 and a second pressure sensor 13, and the signal output end of the PLC control system 9 is respectively connected with an induced draft fan 8 and a pulse ash cleaning device 7; the first pressure sensor 11 is arranged in the cleaning zone 5, and the second temperature sensor 12 and the second pressure sensor 13 are arranged in the bag-type dust removal zone 4. A first temperature sensor 10 is arranged in the cleaning zone 5. The dust recovery device comprises a circulating tank 20 arranged at the bottom of the bag-type dust collector 6, a spray head 21 is arranged at the upper part in the circulating tank 20, the bottom of the circulating tank 20 is connected with a urea solution tank 18 through a pipeline, and the lower part of the urea solution tank 18 is connected with the spray head 21 through a urea solution pump 16; the upper part of the urea solution tank 18 is provided with a desalted water supplementing pipeline 22, and the bottom of the urea solution tank 18 is connected with a urea solution recovery device 19 through a urea solution discharging valve 17. The urea solution tank 18 is provided with a liquid level meter 14 and a densitometer 15. The signal input end of the PLC control system 9 is connected with the densimeter 15, and the signal output end of the PLC control system 9 is connected with the urea solution discharging valve 17. The induced draft fan 8 is 20 variable frequency induced draft fans, and the maximum frequency of the 20 variable frequency induced draft fans is not more than 50Hz.
The dust removing method of the tower type granulation tail gas dust removing device comprises the following steps:
step one: the cold air from the prilling tower 1 exchanges heat with urea solution particles from the prilling spray head 2 to form dust-containing gas;
step two: under the action of an induced draft fan 8, filtering dust from the dust-containing gas in the first step through a cloth bag dust removing device 6, and enabling clean gas to enter a cleaning zone 5;
step three: clean air in the clean room 5 is discharged into the atmosphere through an induced draft fan 8;
step four: the PLC control system 9 monitors the pressure values and the pressure differences of the cleaning area 5 and the cloth bag dust removing area 4 in real time through the first pressure sensor 11 and the second pressure sensor 13, and determines the blowing time of the pulse ash cleaning device 7 through the pressure values and the pressure differences;
the first pressure sensor 11 monitors the pressure in the cleaning zone 5 in real time, and the second pressure sensor 13 monitors the pressure in the bag-type dust removing zone 4 in real time; and transmitting the data to the PLC control system 9 in real time; the pressure difference between the first pressure sensor 11 and the second pressure sensor 13 is 1200Pa;
step five: the PLC control system 9 monitors the actual temperature in the bag-type dust removing area 4 in real time through the second temperature sensor 12, and determines the working frequency of the induced draft fan 8 through comparing the actual temperature with the working temperature; the second temperature sensor 12 monitors the temperature in the bag-type dust removing area 4 to be 50 ℃ in real time;
The pressure difference and the working temperature are within the allowable range of the invention, and other devices can be kept to normally operate.
Example two
The utility model provides a tower granulation tail gas dust collector, includes mechanical part and control part, a, mechanical structure part is equipped with the prilling tower 1 of taking prilling sprayer 2 including inside, and the top of prilling sprayer 2 is equipped with dust recovery unit, and prilling tower 1 top is linked together with the dust pelletizing system, the dust pelletizing system includes dust removal casing 3, and the inside of dust removal casing 3 is equipped with sack dust removal district 4, and sack dust removal district 4's upper portion is equipped with clean district 5, is equipped with sack dust collector 6 in sack dust removal district 4, installs pulse ash removal device 7 on the dust removal casing 3 at sack dust collector 6 top, is equipped with a plurality of induced draft fans 8 on the top circumference of dust removal casing 3; b. the control part comprises a PLC control system 9, wherein the signal input end of the PLC control system 9 is respectively connected with a first pressure sensor 11, a second temperature sensor 12 and a second pressure sensor 13, and the signal output end of the PLC control system 9 is respectively connected with an induced draft fan 8 and a pulse ash cleaning device 7; the first pressure sensor 11 is arranged in the cleaning zone 5, and the second temperature sensor 12 and the second pressure sensor 13 are arranged in the bag-type dust removal zone 4. A first temperature sensor 10 is arranged in the cleaning zone 5. The dust recovery device comprises a circulating tank 20 arranged at the bottom of the bag-type dust collector 6, a spray head 21 is arranged at the upper part in the circulating tank 20, the bottom of the circulating tank 20 is connected with a urea solution tank 18 through a pipeline, and the lower part of the urea solution tank 18 is connected with the spray head 21 through a urea solution pump 16; the upper part of the urea solution tank 18 is provided with a desalted water supplementing pipeline 22, and the bottom of the urea solution tank 18 is connected with a urea solution recovery device 19 through a urea solution discharging valve 17. The urea solution tank 18 is provided with a liquid level meter 14 and a densitometer 15. The signal input end of the PLC control system 9 is connected with the densimeter 15, and the signal output end of the PLC control system 9 is connected with the urea solution discharging valve 17. The induced draft fan 8 is 20 variable frequency induced draft fans, and the maximum frequency of the 20 variable frequency induced draft fans is not more than 50Hz.
The dust removing method of the tower type granulation tail gas dust removing device comprises the following steps:
step one: the cold air from the prilling tower 1 exchanges heat with urea solution particles from the prilling spray head 2 to form dust-containing gas;
step two: under the action of an induced draft fan 8, filtering dust from the dust-containing gas in the first step through a cloth bag dust removing device 6, and enabling clean gas to enter a cleaning zone 5;
step three: clean air in the clean room 5 is discharged into the atmosphere through an induced draft fan 8;
step four: the PLC control system 9 monitors the pressure values and the pressure differences of the cleaning area 5 and the cloth bag dust removing area 4 in real time through the first pressure sensor 11 and the second pressure sensor 13, and determines the blowing time of the pulse ash cleaning device 7 through the pressure values and the pressure differences;
the first pressure sensor 11 monitors the pressure in the cleaning zone 5 in real time, and the second pressure sensor 13 monitors the pressure in the bag-type dust removing zone 4 in real time; and transmitting the data to the PLC control system 9 in real time; when the pressure difference between the first pressure sensor 11 and the second pressure sensor 13 is 1250Pa, the PLC control system 9 controls the pulse ash cleaning device 7 to start, and high-pressure gas reversely blows to the cloth bag dust cleaning device 6 through the ejection pipe and the blowing head to remove dust; to reduce the pressure difference between the first pressure sensor 11 and the second pressure sensor 13 to 700Pa;
Step five: the PLC control system 9 monitors the actual temperature in the bag-type dust removing area 4 in real time through the second temperature sensor 12, and determines the working frequency of the induced draft fan 8 through comparing the actual temperature with the working temperature;
when the second temperature sensor 12 monitors the temperature in the bag-type dust removing area 4 to be 20 ℃ in real time, the PLC control system 9 controls the frequency of the induced draft fan 8 to be reduced, so that the temperature in the bag-type dust removing area 4 reaches 30 ℃;
step six: dust of the cloth bag dust collector 6 enters the circulation tank 20 under the blowing action of the pulse ash cleaner 7;
step seven: desalted water is supplemented in the urea solution tank 18 through a desalted water supplementing pipeline 22, and the desalted water in the urea solution tank 18 enters the circulating tank 20 in the step six through the urea solution pump 16 and the spray head 21 to be combined with dust to form a dilute urea solution;
step eight: when the density meter 15 detects that the concentration of the dilute urea solution is 10%, a urea solution discharging valve 17 is opened, so that the urea solution in the urea solution tank 18 enters a urea solution recovery device 19 through the urea solution discharging valve 17 to be recovered and reused;
step nine: after the urea solution enters the urea solution recovery device 19, the urea solution discharging valve 17 is closed, and meanwhile, a desalted water supplementing pipeline 22 supplements desalted water into the urea solution tank 18;
Step ten: when the densimeter 15 detects that the concentration of the dilute urea solution is not more than 10%, the urea solution pump 16 is started, so that the dilute urea solution enters the circulation tank 20 to continuously dilute the dust falling in the bag-type dust removing device 6.
Example III
The utility model provides a tower granulation tail gas dust collector, includes mechanical part and control part, a, mechanical structure part is equipped with the prilling tower 1 of taking prilling sprayer 2 including inside, and the top of prilling sprayer 2 is equipped with dust recovery unit, and prilling tower 1 top is linked together with the dust pelletizing system, the dust pelletizing system includes dust removal casing 3, and the inside of dust removal casing 3 is equipped with sack dust removal district 4, and sack dust removal district 4's upper portion is equipped with clean district 5, is equipped with sack dust collector 6 in sack dust removal district 4, installs pulse ash removal device 7 on the dust removal casing 3 at sack dust collector 6 top, is equipped with a plurality of induced draft fans 8 on the top circumference of dust removal casing 3; b. the control part comprises a PLC control system 9, wherein the signal input end of the PLC control system 9 is respectively connected with a first pressure sensor 11, a second temperature sensor 12 and a second pressure sensor 13, and the signal output end of the PLC control system 9 is respectively connected with an induced draft fan 8 and a pulse ash cleaning device 7; the first pressure sensor 11 is arranged in the cleaning zone 5, and the second temperature sensor 12 and the second pressure sensor 13 are arranged in the bag-type dust removal zone 4. A first temperature sensor 10 is arranged in the cleaning zone 5. The dust recovery device comprises a circulating tank 20 arranged at the bottom of the bag-type dust collector 6, a spray head 21 is arranged at the upper part in the circulating tank 20, the bottom of the circulating tank 20 is connected with a urea solution tank 18 through a pipeline, and the lower part of the urea solution tank 18 is connected with the spray head 21 through a urea solution pump 16; the upper part of the urea solution tank 18 is provided with a desalted water supplementing pipeline 22, and the bottom of the urea solution tank 18 is connected with a urea solution recovery device 19 through a urea solution discharging valve 17. The urea solution tank 18 is provided with a liquid level meter 14 and a densitometer 15. The signal input end of the PLC control system 9 is connected with the densimeter 15, and the signal output end of the PLC control system 9 is connected with the urea solution discharging valve 17. The induced draft fan 8 is 20 variable frequency induced draft fans, and the maximum frequency of the 20 variable frequency induced draft fans is not more than 50Hz.
The dust removing method of the tower type granulation tail gas dust removing device comprises the following steps:
step one: the cold air from the prilling tower 1 exchanges heat with urea solution particles from the prilling spray head 2 to form dust-containing gas;
step two: under the action of an induced draft fan 8, filtering dust from the dust-containing gas in the first step through a cloth bag dust removing device 6, and enabling clean gas to enter a cleaning zone 5;
step three: clean air in the clean room 5 is discharged into the atmosphere through an induced draft fan 8;
step four: the PLC control system 9 monitors the pressure values and the pressure differences of the cleaning area 5 and the cloth bag dust removing area 4 in real time through the first pressure sensor 11 and the second pressure sensor 13, and determines the blowing time of the pulse ash cleaning device 7 through the pressure values and the pressure differences; the first pressure sensor 11 monitors the pressure in the cleaning zone 5 in real time, and the second pressure sensor 13 monitors the pressure in the bag-type dust removing zone 4 in real time; and transmitting the data to the PLC control system 9 in real time; when the pressure difference between the first pressure sensor 11 and the second pressure sensor 13 is 1230Pa, the PLC control system 9 controls the pulse ash cleaning device 7 to start, and high-pressure gas reversely blows to the cloth bag dust cleaning device 6 through the ejection pipe and the blowing head to remove dust; to reduce the pressure difference between the first pressure sensor 11 and the second pressure sensor 13 to 950Pa;
Step five: the PLC control system 9 monitors the actual temperature in the bag-type dust removing area 4 in real time through the second temperature sensor 12, and determines the working frequency of the induced draft fan 8 through comparing the actual temperature with the working temperature;
when the second temperature sensor 12 monitors the temperature in the bag-type dust removing area 4 to be 70 ℃ in real time, the PLC control system 9 controls the frequency of the induced draft fan 8 to be increased, so that the temperature in the bag-type dust removing area 4 reaches 60 ℃;
step six: dust of the cloth bag dust collector 6 enters the circulation tank 20 under the blowing action of the pulse ash cleaner 7;
step seven: desalted water is supplemented in the urea solution tank 18 through a desalted water supplementing pipeline 22, and the desalted water in the urea solution tank 18 enters the circulating tank 20 in the step six through the urea solution pump 16 and the spray head 21 to be combined with dust to form a dilute urea solution;
step eight: when the density meter 15 detects that the concentration of the dilute urea solution is 40%, the urea solution discharging valve 17 is opened, so that the urea solution in the urea solution tank 18 enters the urea solution recovery device 19 through the urea solution discharging valve 17 to be recovered and reused;
step nine: after the urea solution enters the urea solution recovery device 19, the urea solution discharging valve 17 is closed, and meanwhile, a desalted water supplementing pipeline 22 supplements desalted water into the urea solution tank 18;
Step ten: when the densimeter 15 detects that the concentration of the dilute urea solution is not more than 40%, the urea solution pump 16 is started, so that the dilute urea solution enters the circulation tank 20 to continuously dilute the dust falling in the bag-type dust removing device 6.
Example IV
The utility model provides a tower granulation tail gas dust collector, includes mechanical part and control part, a, mechanical structure part is equipped with the prilling tower 1 of taking prilling sprayer 2 including inside, and the top of prilling sprayer 2 is equipped with dust recovery unit, and prilling tower 1 top is linked together with the dust pelletizing system, the dust pelletizing system includes dust removal casing 3, and the inside of dust removal casing 3 is equipped with sack dust removal district 4, and sack dust removal district 4's upper portion is equipped with clean district 5, is equipped with sack dust collector 6 in sack dust removal district 4, installs pulse ash removal device 7 on the dust removal casing 3 at sack dust collector 6 top, is equipped with a plurality of induced draft fans 8 on the top circumference of dust removal casing 3; b. the control part comprises a PLC control system 9, wherein the signal input end of the PLC control system 9 is respectively connected with a first pressure sensor 11, a second temperature sensor 12 and a second pressure sensor 13, and the signal output end of the PLC control system 9 is respectively connected with an induced draft fan 8 and a pulse ash cleaning device 7; the first pressure sensor 11 is arranged in the cleaning zone 5, and the second temperature sensor 12 and the second pressure sensor 13 are arranged in the bag-type dust removal zone 4. A first temperature sensor 10 is arranged in the cleaning zone 5. The dust recovery device comprises a circulating tank 20 arranged at the bottom of the bag-type dust collector 6, a spray head 21 is arranged at the upper part in the circulating tank 20, the bottom of the circulating tank 20 is connected with a urea solution tank 18 through a pipeline, and the lower part of the urea solution tank 18 is connected with the spray head 21 through a urea solution pump 16; the upper part of the urea solution tank 18 is provided with a desalted water supplementing pipeline 22, and the bottom of the urea solution tank 18 is connected with a urea solution recovery device 19 through a urea solution discharging valve 17. The urea solution tank 18 is provided with a liquid level meter 14 and a densitometer 15. The signal input end of the PLC control system 9 is connected with the densimeter 15, and the signal output end of the PLC control system 9 is connected with the urea solution discharging valve 17. The induced draft fan 8 is 20 variable frequency induced draft fans, and the maximum frequency of the 20 variable frequency induced draft fans is not more than 50Hz.
The dust removing method of the tower type granulation tail gas dust removing device comprises the following steps:
step one: the cold air from the prilling tower 1 exchanges heat with urea solution particles from the prilling spray head 2 to form dust-containing gas;
step two: under the action of an induced draft fan 8, filtering dust from the dust-containing gas in the first step through a cloth bag dust removing device 6, and enabling clean gas to enter a cleaning zone 5;
step three: clean air in the clean room 5 is discharged into the atmosphere through an induced draft fan 8;
step four: the PLC control system 9 monitors the pressure values and the pressure differences of the cleaning area 5 and the cloth bag dust removing area 4 in real time through the first pressure sensor 11 and the second pressure sensor 13, and determines the blowing time of the pulse ash cleaning device 7 through the pressure values and the pressure differences;
the first pressure sensor 11 monitors the pressure in the cleaning zone 5 in real time, and the second pressure sensor 13 monitors the pressure in the bag-type dust removing zone 4 in real time; and transmitting the data to the PLC control system 9 in real time; when the pressure difference between the first pressure sensor 11 and the second pressure sensor 13 is 1300Pa, the PLC control system 9 controls the pulse ash cleaning device 7 to start, and high-pressure gas reversely blows to the cloth bag dust cleaning device 6 through the ejection pipe and the blowing head to remove dust; to reduce the pressure difference between the first pressure sensor 11 and the second pressure sensor 13 to 800Pa;
Step five: the PLC control system 9 monitors the actual temperature in the bag-type dust removing area 4 in real time through the second temperature sensor 12, and determines the working frequency of the induced draft fan 8 through comparing the actual temperature with the working temperature; the second temperature sensor 12 monitors the temperature in the bag-type dust removing area 4 in real time; when the temperature in the bag-type dust removing area 4 is 65 ℃, the PLC control system 9 controls the frequency of the induced draft fan 8 to be increased, so that the temperature in the bag-type dust removing area 4 reaches 45 ℃;
step six: dust of the cloth bag dust collector 6 enters the circulation tank 20 under the blowing action of the pulse ash cleaner 7;
step seven: desalted water is supplemented in the urea solution tank 18 through a desalted water supplementing pipeline 22, and the desalted water in the urea solution tank 18 enters the circulating tank 20 in the step six through the urea solution pump 16 and the spray head 21 to be combined with dust to form a dilute urea solution;
step eight: when the density meter 15 detects that the concentration of the dilute urea solution is 25%, the urea solution discharging valve 17 is opened, so that the urea solution in the urea solution tank 18 enters the urea solution recovery device 19 through the urea solution discharging valve 17 for recovery and reutilization;
Step nine: after the urea solution enters the urea solution recovery device 19, the urea solution discharging valve 17 is closed, and meanwhile, a desalted water supplementing pipeline 22 supplements desalted water into the urea solution tank 18;
step ten: when the densimeter 15 detects that the concentration of the dilute urea solution is not more than 25%, the urea solution pump 16 is started, so that the dilute urea solution enters the circulation tank 20 to continuously dilute the dust falling in the bag-type dust removing device 6.
Example five
The pressure difference between the first pressure sensor 11 and the second pressure sensor 13 in the present embodiment is 700Pa; the rest is the same as in embodiment one; the pressure difference and the working temperature are within the allowable range of the invention, and other devices can be kept to normally operate.
Experimental example six
The pressure difference between the first pressure sensor 11 and the second pressure sensor 13 in this embodiment is 950Pa; the rest is the same as in embodiment one; the pressure difference and the working temperature are within the allowable range of the invention, and other devices can be kept to normally operate.
Experimental example
In the working processes of the first embodiment, the second embodiment, the third embodiment and the fourth embodiment, particulate matter is detected, and the unit of detection report is: henan province institute of detection, inc., report number: ZYTHJB2018-0176, detection type: entrusting detection; test unit: detection address of four divisions of Henan Hexin company chemical fertilizer Limited company: the Qinglong road center company of the new rural urban economic technology development area is a quarter of chemical fertilizer Limited company; detection category: exhaust gas; the date of issuance: 30 days 3 of 2018; sampling date: day 23 of 3 months in 2018, analysis date: 23 in 3 months in 2018-25 in 3 months in 2018; in embodiment one, the exhaust air volume is 2.37X10 5 m 3 /h, discharge concentration 3.15mg/m 3 The discharge rate is 0.747kg/h; in the second embodiment, the exhaust air volume is 2.35×10 5 m 3 /h, discharge concentration 2.98mg/m 3 The discharge rate is 0.700kg/h; in the third embodiment, the exhaust air volume is 2.50X10 5 m 3 /h, discharge concentration 3.72mg/m 3 The discharge rate is 0.930kg/h; in the fourth embodiment, the exhaust air volume is 2.50X10 5 m 3 /h, discharge concentration 3.17mg/m 3 The discharge rate was 0.793kg/h. The result of the detection report shows that the dust emission of the invention is far lower than that of the existing water washing dust removing mode and the corresponding national standard.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "end," "inner wall," "front end," etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "provided with," "mounted to," "connected to," and the like are to be construed broadly, and may be, for example, fixedly connected, integrally connected, or detachably connected; or the communication between the two components is also possible; may be directly connected or indirectly connected through an intermediate medium, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to the specific circumstances. Finally, it is noted that the above-mentioned preferred embodiments are only intended to illustrate rather than limit the invention, and that, although the invention has been described in detail by means of the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (5)
1. The utility model provides a tower granulation tail gas dust collector, its includes mechanical part and control portion, its characterized in that:
a. the mechanical structure part comprises a granulation tower (1) with a granulation spray head (2) arranged inside, a dust recovery device is arranged at the top of the granulation spray head (2), the top of the granulation tower (1) is communicated with a dust removal system, the dust removal system comprises a dust removal shell (3), a cloth bag dust removal area (4) is arranged inside the dust removal shell (3), a cleaning area (5) is arranged at the upper part of the cloth bag dust removal area (4), a cloth bag dust removal device (6) is arranged in the cloth bag dust removal area (4), a pulse ash removal device (7) is arranged on the dust removal shell (3) at the top of the cloth bag dust removal device (6), and a plurality of induced draft fans (8) are arranged on the circumference of the top of the dust removal shell (3);
b. the control part comprises a PLC control system (9), the signal input end of the PLC control system (9) is respectively connected with a first pressure sensor (11), a second temperature sensor (12) and a second pressure sensor (13), and the signal output end of the PLC control system (9) is respectively connected with an induced draft fan (8) and a pulse ash cleaning device (7); the first pressure sensor (11) is arranged in the cleaning area (5), and the second temperature sensor (12) and the second pressure sensor (13) are arranged in the bag-type dust removing area (4); a first temperature sensor (10) is arranged in the cleaning area (5);
The dust recovery device comprises a circulating groove (20) arranged at the bottom of the bag-type dust collector (6), a spray head (21) is arranged at the upper part in the circulating groove (20), the bottom of the circulating groove (20) is connected with a urea solution groove (18) through a pipeline, and the lower part of the urea solution groove (18) is connected with the spray head (21) through a urea solution pump (16); the upper part of the urea solution tank (18) is provided with a desalted water supplementing pipeline (22), and the bottom of the urea solution tank (18) is connected with a urea solution recovery device (19) through a urea solution discharging valve (17); the urea solution tank (18) is provided with a liquid level meter (14) and a densimeter (15);
the signal input end of the PLC control system (9) is connected with the densimeter (15), and the signal output end of the PLC control system (9) is connected with the urea solution discharging valve (17); the induced draft fan (8) is 20 variable frequency induced draft fans, and the maximum frequency of the 20 variable frequency induced draft fans is not more than 50Hz.
2. A dust removing method of a tower type granulation tail gas dust removing device, which adopts the tower type granulation tail gas dust removing device as claimed in claim 1, characterized in that: the dust removing method of the tower type granulation tail gas dust removing device comprises the following steps:
step one: the cold air from the prilling tower (1) exchanges heat with urea solution particles from the prilling spray head (2) to form dust-containing gas;
Step two: under the action of an induced draft fan (8), filtering dust from dust-containing gas in the first step through a cloth bag dust removing device (6), and enabling clean gas to enter a cleaning zone (5);
step three: clean air in the cleaning area (5) is discharged into the atmosphere through an induced draft fan (8);
step four: the PLC control system (9) monitors the pressure values and the pressure differences of the cleaning area (5) and the cloth bag dust removing area (4) in real time through the first pressure sensor (11) and the second pressure sensor (13), and determines the blowing time of the pulse ash removing device (7) through the pressure values and the pressure differences; the first pressure sensor monitors the pressure in the cleaning area in real time, and the second pressure sensor monitors the pressure in the bag-type dust removing area in real time; transmitting the pressure data to the PLC control system in real time;
step five: the PLC control system (9) monitors the actual temperature in the bag-type dust removing area (4) in real time through the second temperature sensor (12), and determines the working frequency of the induced draft fan (8) through comparing the actual temperature with the working temperature;
step six: dust of the cloth bag dust removing device (6) enters the circulating groove (20) under the action of blowing of the pulse dust removing device (7);
step seven: desalted water is replenished in the urea solution tank (18) through a desalted water replenishing pipeline (22), and the desalted water in the urea solution tank (18) enters a circulating tank (20) in the step six through a urea solution pump (16) and a spray head (21) to be combined with dust to form a dilute urea solution;
Step eight: when the density meter (15) detects that the concentration of the dilute urea solution is 10% -40%, a urea solution discharging valve (17) is opened, so that the urea solution in the urea solution tank (18) enters a urea solution recovery device (19) through the urea solution discharging valve (17) for recovery and reuse;
step nine: after the urea solution enters the urea solution recovery device (19), a urea solution discharging valve (17) is closed, and meanwhile, a desalted water supplementing pipeline (22) supplements desalted water into a urea solution tank (18);
step ten: when the density meter (15) detects that the concentration of the dilute urea solution is not more than 10% -40%, the urea solution pump (16) is started, so that the dilute urea solution enters the circulating tank (20) to continuously dilute the dust falling in the bag-type dust removing device (6).
3. The dust removal method of the tower-type granulation tail gas dust removal device according to claim 2, wherein the dust removal method comprises the following steps of: in the fourth step, the pressure difference between the first pressure sensor (11) and the second pressure sensor (13) is 700 Pa-1200 Pa; when the pressure difference between the first pressure sensor (11) and the second pressure sensor (13) is larger than 1200Pa, the PLC control system (9) controls the pulse ash removing device (7) to start, and high-pressure gas reversely blows to the cloth bag dust removing device (6) through the ejection pipe and the blowing head to remove dust; so as to reduce the pressure difference between the first pressure sensor (11) and the second pressure sensor (13) to be within 700 Pa-1200 Pa.
4. A dust removal method of a tower granulation tail gas dust removal device according to claim 3, wherein: in the fifth step, a second temperature sensor (12) monitors the temperature in the bag-type dust removing area (4) in real time; the temperature in the bag-type dust removing area (4) is 30-60 ℃.
5. The dust removing method of the tower type granulation tail gas dust removing device according to claim 4, wherein the dust removing method comprises the following steps: when the temperature in the bag-type dust removing area (4) is lower than 30 ℃, the PLC control system (9) controls the frequency of the induced draft fan (8) to be reduced, so that the temperature in the bag-type dust removing area (4) reaches 30-60 ℃; when the temperature in the bag-type dust removing area (4) is higher than 60 ℃, the PLC control system (9) controls the frequency of the induced draft fan (8) to be increased, so that the temperature in the bag-type dust removing area (4) reaches 30-60 ℃.
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| CN110180275A (en) * | 2019-06-13 | 2019-08-30 | 福建龙净环保股份有限公司 | Dust pelletizing system for urea prilling tower |
| CN110404351B (en) * | 2019-08-29 | 2024-06-18 | 上海境业环保能源科技股份有限公司 | Urea prilling tower dust pelletizing system with fan access door |
| CN110465145A (en) * | 2019-08-29 | 2019-11-19 | 上海境业环保能源科技股份有限公司 | A kind of dust pelletizing system of urea prilling tower |
| CN110496516A (en) * | 2019-09-24 | 2019-11-26 | 福建龙净环保股份有限公司 | A kind of urea prilling tower removes ammonia system |
| CN113521899B (en) * | 2021-07-29 | 2023-01-03 | 福建龙净环保股份有限公司 | Ash removal method of bag type dust collector |
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| JP3337291B2 (en) * | 1993-11-30 | 2002-10-21 | 塩野義製薬株式会社 | Filtration filter breakage detection device, filtration filter breakage detection method, and fluidized bed granulation device |
| KR101060933B1 (en) * | 2008-12-02 | 2011-08-31 | 대덕대학산학협력단 | Solenoid Valve Control Method Using Solenoid Valve Control System of Impact Airflow Filter Bag Dust Collector |
| CN102921247B (en) * | 2012-11-13 | 2014-11-05 | 济南大学 | Dust removal system and controller thereof |
| CN103521008A (en) * | 2013-11-06 | 2014-01-22 | 山东开泰工业科技有限公司 | Optimization energy-saving dedusting control method and system of cloth bag pulse dust collector |
| CN204601933U (en) * | 2015-05-15 | 2015-09-02 | 武华友 | A kind of granulation tower dust reclaims ultrafiltration apparatus |
| CN105688586A (en) * | 2016-04-06 | 2016-06-22 | 王献 | Dust recycling device for high-tower granulation of compound fertilizer |
| CN106377968A (en) * | 2016-12-01 | 2017-02-08 | 合力泰科技股份有限公司 | Dust removing and recycling system for granulation column |
| CN206762482U (en) * | 2017-04-20 | 2017-12-19 | 上海境业环保能源科技股份有限公司 | Carbamide granulation column overhead bladder type powder recepting device |
| CN208894161U (en) * | 2018-05-22 | 2019-05-24 | 河南心连心化肥有限公司 | A kind of tower granulation tail gas dust cleaning apparatus |
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