CN108465437A - A kind of tower granulation tail gas dust cleaning apparatus and its dust removal method - Google Patents
A kind of tower granulation tail gas dust cleaning apparatus and its dust removal method Download PDFInfo
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- CN108465437A CN108465437A CN201810534428.2A CN201810534428A CN108465437A CN 108465437 A CN108465437 A CN 108465437A CN 201810534428 A CN201810534428 A CN 201810534428A CN 108465437 A CN108465437 A CN 108465437A
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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 kind of tower granulation tail gas dust cleaning apparatus and its dust removal methods；Including mechanical part and control section, mechanical structure portion includes granulation tower, it is connected with dust pelletizing system at the top of granulation tower, dust pelletizing system includes dedusting shell, bag-type dust area is equipped in dedusting shell, bag-type dust area top is equipped with clear area, bag-type dust collector is equipped in bag-type dust area, pulse ash remover is installed, the top circumference of dedusting shell is equipped with several air-introduced machines on the dedusting shell at the top of bag-type dust collector；Control section includes PLC control system, the signal input part of the PLC control system is connected with first pressure sensor, second temperature sensor and second pressure sensor respectively, and the signal output end of PLC control system is connected with air-introduced machine and pulse ash remover respectively；It can effectively solve the problem that hangover and the short problem of bag-type dust operation hours, the dusty gas concentration dust content of outlet made to be reduced to 10mg/Nm3Within the advantages of.
Description
Technical field
The invention belongs to tail gas generated by granulation dedusting technology fields, and in particular to a kind of tower granulation tail gas dust cleaning apparatus and its remove
Dust collecting method.
Background technology
So far, nitrogen throughout production capacity about reaches more than 8,000 ten thousand tons, and domestic large, medium and small type urea enterprise is substantially all
It is that the granulation tower used carries out carbamide granulation, granulation tower has two kinds of natural draft ventilation prilling tower and force ventilation granulation tower.Urea is made
Grain is that the urea of melting carries out sprinkling granulation at the top of granulation tower by the nozzle of rotation, by the cold air be sent into bottom of tower into
Row counter current contacting, liquid urea crystallization cooling after liquid particles are solid-state, solid granulates cooling three phases.
Since prilling spry sprinkling and urine chemical breakdown itself synthesize cause part carbamide dust again in granulation process
Generation, this part dust enters the top of tower together with cold air, there is discharge at the top of granulation tower.It is often given birth to through rough Statistics
It is about 1.2~2.0kg to produce dust caused by 1 ton of urea, and the urea prilling tower for producing 500000 tons per year with one calculates, if should
Part urea powder is not collected well, then annual outer row's urea powder reaches 600t, so-called dust of urea granulation
Or urea is not only to lose if not recycling, and is adversely affected to personnel's health and ambient enviroment.Existing granulation
The recycling of tower dust is mainly using washing dust-extraction unit, using the characteristic that urea is soluble easily in water, fills out granulation tower top layout is a variety of
Material, there are mainly two types of the effects of filler, and one is gas liquid interfacial area is increased, another kind is received to the liquid in gas
Collection reduces the dust concentration and drop in efflux gas with this.
But washing dust-extraction unit is primarily present problems with：(1) efficiency of dust collection is low.Washing dedusting mainly will be dissolved in water
Urea powder is settled by gravity, and the droplet to not settling down is intercepted by filler, to improve
Dedusting demisting efficiency, the general pattern rinsed using the multistage filler multistage of arrangement, but only by washing dedusting demister, one
As smoke dust discharge concentration in 50mg/m3Left and right, is extremely difficult to 10mg/m3Effect below.(2) filler blocks.Urea powder is dissolved in
Water, if after being intercepted by filler, not being flush with water in time or some dead zones not being flushed to for a long time,
Urea powder is cumulative, will form crystallization on filler, gradually block filler, increases system resistance, when resistance reaches
When certain value, filler will be thrown by gas, cause gas short-circuit, reduce the dedusting demisting efficiency of filler.Shadow after filler blocks
Granulation tower ventilation is rung, causes granulation tower to be granulated cooling effect poor.(3) efflux gas band liquid.Filler backwashing manner is generally undershoot
It washes or upper flushing, filler rinses from top to bottom, gas flow is arrived not yet with the reverse progress of liquid flow direction, partial flushing water
It is taken away up to easy when filler by gas；Flushing water rinses from bottom to top, and filler upper layer is not easy to rinse well.And due to
The granulation tower top of tower arrangement washing dust-extraction unit of height 90m or so, often due to granulation tower load-bearing and difficulty of construction are big, washing
Gas after dedusting is with floss hole distance only in 3m or so, and gas residence time is short, and the drop in gas does not have settlement space,
And top axial flow blower draft is big so that efflux gas band liquid situation is more serious, since urea powder is highly soluble in water, outer row
Gas band liquid is not only water, contains urea powder, is adversely affected to surrounding enviroment.(4) granulation tower hangover is serious, by
In washing in dust removal process, it is generally adopted as the decomposition of effluent of urea plant, temperature is in 30-40 degrees centigrades, in dedusting
It is atomized using peculiar nozzle, is then contacted again with dust and achieve the purpose that recycling, this part water under the action of air-introduced machine
Vapour is discharged into air, forms hangover.
The above problem is caused by granulation tower and washing cleaner oneself factor, in order to solve drawbacks described above
Some Enterprises are attempted by the way of bag-type dust, but are not succeeded always, and traditional washing dedusting method is still continued to use；Study carefully
Its reason, by taking urea as an example, urea, can be in short-term in the way of cloth-sack-type dust removal there is the easy moisture absorption, the characteristic easily to scab
Between run, when running between it is longer when cloth bag on it is easy to stick connect carbamide dust, and carbamide dust can not be removed by the way of injection
It goes, causes air-introduced machine load larger, dust removing effects directly result in cleaner when poor and serious and can not work, especially summer
The influence for the factors such as temperature is high, and humidity is big, the above problem are particularly acute.
Invention content
The purpose of the present invention is to overcome the defects in the prior art, provides one kind simple in structure, small investment, design and closes
It manages, can effectively solve the problem that hangover and the short problem of bag-type dust operation hours, and make the dusty gas concentration of outlet
Dust content is reduced to 10mg/Nm3Within a kind of tower granulation tail gas dust cleaning apparatus and its dust removal method.
The object of the present invention is achieved like this：A kind of tower granulation tail gas dust cleaning apparatus, the device include Machinery Ministry
Divide and control section, a, mechanical structure portion include being internally provided with the granulation tower with prilling spry, the top of prilling spry is equipped with
Device for recovering powder is connected with dust pelletizing system at the top of granulation tower, and the dust pelletizing system includes dedusting shell, dedusting shell it is interior
Portion is equipped with bag-type dust area, and the top in bag-type dust area is equipped with clear area, bag-type dust collector, cloth bag are equipped in bag-type dust area
Pulse ash remover is installed, the top circumference of dedusting shell is equipped with several air inducing on the dedusting shell at the top of dust-extraction unit
Machine；B, control section includes PLC control system, the signal input part of the PLC control system respectively with first pressure sensor,
Second temperature sensor is connected with second pressure sensor, the signal output end of PLC control system respectively with air-introduced machine and pulse
Deashing device is connected；The first pressure sensor is arranged in clear area, second temperature sensor and second pressure sensor
It is arranged in bag-type dust area.
Preferably, the first temperature sensor is equipped in the clear area.
Preferably, the device for recovering powder includes the circulating slot for being located at bag-type dust collector bottom, circulating slot internal upper part
Equipped with nozzle, the bottom of circulating slot is connected by pipeline with urea liquid slot, and the lower part of urea liquid slot passes through urea solution pump
It is connected with nozzle；The top of urea liquid slot is equipped with desalted water and supplements pipeline, and the bottom of urea liquid slot is gone out by urea liquid
Material valve is connected with urea liquid retracting device.
Preferably, the urea liquid slot is equipped with liquid level gauge and densitometer.
Preferably, the signal input part of the PLC control system is connected with densitometer, the signal output of PLC control system
End is connected with urea liquid discharge valve.
Preferably, the air-introduced machine is 20 frequency converting induced draft fans, and the maximum frequency of 20 frequency converting induced draft fans is not more than 50Hz.
A kind of dust removal method of tower granulation tail gas dust cleaning apparatus, it is characterised in that：The dust removal method includes the following steps：
Step 1：The cold air for coming from granulation tower exchanges heat with the urea liquid particle for coming from prilling spry, shape
At dusty gas；
Step 2：Dusty gas described in step 1 is under the action of air-introduced machine, by bag-type dust collector by dust
After filtering out, clean gas enters in clear area；
Step 3：Pure air in clean room is discharged by air-introduced machine in air；
Step 4：PLC control system by first pressure sensor and the real-time monitoring cleaning area of second pressure sensor with
And the pressure value and pressure difference in bag-type dust area, when by the injection to determine pulse ash remover of above-mentioned pressure value and pressure difference
Machine；
Step 5：PLC control system monitors the actual temperature in bag-type dust area by second temperature sensor in real time, leads to
Actual temperature is crossed to be compared with operating temperature to determine the working frequency of air-introduced machine；
Step 6：The dust of bag-type dust collector enters under the action of pulse ash remover is blown in circulating slot；
Step 7：Pipeline is supplemented by desalted water in urea liquid slot and is supplemented with desalted water, the desalination in urea liquid slot
Water is entered step in the circulating slot described in six with nozzle by urea solution pump and is combined to form dilute urea solution with dust；
Step 8：Dilute urea solution is entered by pipeline in urea liquid slot, when densitometer detects the dense of dilute urea solution
When degree is 10%~40%, urea liquid discharge valve is opened, so that the urea liquid in urea liquid slot is passed through urea liquid and goes out
Material valve enters in urea liquid retracting device, recycling；
Step 9：Urea liquid closes urea liquid discharge valve after entering urea liquid retracting device, while making desalination
Water supplement pipeline fills into desalted water into urea liquid slot；
Step 10：When the concentration that densitometer detects dilute urea solution is not more than 10%~40%, urea solution pump is opened,
Make dilute urea solution enter in circulating slot to continue to dilute the dust fallen in bag-type dust collector.
Pressure in the step 4 in the real-time monitoring cleaning area of first pressure sensor, second pressure sensor are supervised in real time
Survey the pressure in bag-type dust area；And it will be in above-mentioned real-time data transmission to PLC control system；The first pressure sensor with
Pressure difference between second pressure sensor is 700~1200Pa；When between first pressure sensor and second pressure sensor
Pressure difference when being more than 1200Pa, PLC control system controls pulse ash remover and starts, and high pressure gas passes through bleed pipe and spray
Blow head carries out blowback to bag-type dust collector, carries out dust and handles；It is sensed with second pressure with reducing first pressure sensor
Pressure difference drop between device, is allowed to be down within 700Pa~1200Pa.
Preferably, second temperature sensor monitors the temperature in bag-type dust area in real time in the step 5；The cloth bag
Temperature in dedusting area is 30 DEG C~60 DEG C.
Preferably, when the temperature when in bag-type dust area is less than 30 DEG C, PLC control system controls the frequency of air-introduced machine
It reduces, so that the temperature in bag-type dust area is reached 30 DEG C~60 DEG C to reach；When the temperature in bag-type dust area is more than 60 DEG C
When, the frequency of PLC control system control air-introduced machine increases, when the temperature in bag-type dust area being made to reach 30 DEG C~60 DEG C until.
According to a kind of tower granulation tail gas dust cleaning apparatus and its dust removal method made of said program, it is being granulated by setting
Top of tower setting dust pelletizing system can effectively prevent dust to escape out outside granulation tower, realize that dust can only the interior mesh recycled of granulation tower
, due to being equipped with air-introduced machine in dust pelletizing system, and the frequency of air-introduced machine can reach 50Hz, far beyond washing cleaner
In blower unit, to for improve efficiency of dust collection lay a solid foundation, pass through purifying rate pole under the cooperation of air-introduced machine
High bag-type dust collector dedusting can be realized the fuel gas and dust content that air-introduced machine exports dropping to 10mg/m3It is below super
Low emission index；Effective recycling to dust can be realized by the way that device for recovering powder is arranged, and economized on resources and reduced to reach
The purpose of entreprise cost；It can be to removing by the way that first pressure sensor, second temperature sensor and second pressure sensor is arranged
The environment of dirt internal system is detected, with solve cloth-sack-type dust removal device cannot for a long time be run in granulating system lack
It falls into；With simple in structure, small investment, reasonable design, it can effectively solve the problem that hangover and bag-type dust operation hours are short
Problem, and the dusty gas concentration dust content of outlet is made to be reduced to 10mg/Nm3Within the advantages of.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the control principle schematic diagram of the present invention.
Specific implementation mode
In order to which the technical features, objects and effects to invention are more clearly understood, now control description of the drawings is of the invention
Specific implementation mode, in the various figures identical label indicate identical component.It is only schematic in each figure to make simplified form
Ground indicates part related to the present invention, they do not represent its practical structures as product.
As shown in Figure 1, 2, the present invention is a kind of tower granulation tail gas dust cleaning apparatus and its dust removal method, wherein tower to make
Grain tail gas dust cleaning apparatus, including mechanical part and control section, a, mechanical structure portion include being internally provided with prilling spry 2
The top of granulation tower 1, prilling spry 2 is equipped with device for recovering powder, and 1 top of granulation tower is connected with dust pelletizing system, the dedusting
System includes dedusting shell 3, and dedusting shell 3 is internally provided with bag-type dust area 4, and the top in bag-type dust area 4 is equipped with clear area
5, bag-type dust area 4 is interior to be equipped with bag-type dust collector 6, and pulse dust cleaning is equipped on the dedusting shell 3 at 6 top of bag-type dust collector
The top circumference of device 7, dedusting shell 3 is equipped with several air-introduced machines 8；
B, control section includes PLC control system 9, the signal input part of the PLC control system 9 respectively with first pressure
Sensor 11, second temperature sensor 12 are connected with second pressure sensor 13, the signal output end difference of PLC control system 9
It is connected with air-introduced machine 8 and pulse ash remover 7；The first pressure sensor 11 is arranged in clear area 5, second temperature sensing
Device 12 and second pressure sensor 13 are arranged in bag-type dust area 4.
The first temperature sensor 10 is equipped in the clear area 5.
The device for recovering powder includes the circulating slot 20 for being located at 6 bottom of bag-type dust collector, and 20 internal upper part of circulating slot is set
There are nozzle 21, the bottom of circulating slot 20 to be connected with urea liquid slot 18 by pipeline, the lower part of urea liquid slot 18 passes through urea
Solution pump 16 is connected with nozzle 21；The top of urea liquid slot 18 is equipped with desalted water and supplements pipeline 22, the bottom of urea liquid slot 18
Portion is connected by urea liquid discharge valve 17 with urea liquid retracting device 19.The urea liquid slot 18 is equipped with liquid level gauge
14 and densitometer 15.The signal input part of the PLC control system 9 is connected with densitometer 15, and the signal of PLC control system 9 is defeated
Outlet is connected with urea liquid discharge valve 17.The air-introduced machine 8 is 20 frequency converting induced draft fans, the maximum of 20 frequency converting induced draft fans
Frequency is not more than 50Hz.
A kind of dust removal method of tower granulation tail gas dust cleaning apparatus, the dust removal method include the following steps：
Step 1：The cold air for coming from granulation tower 1 exchanges heat with the urea liquid particle for coming from prilling spry 2,
Form dusty gas；
Step 2：Dusty gas described in step 1 is under the action of air-introduced machine 8, by bag-type dust collector 6 by powder
After dirt filters out, clean gas enters in clear area 5；
Step 3：Pure air in clean room 5 is discharged by air-introduced machine 8 in air；
Step 4：PLC control system 9 passes through first pressure sensor 11 and 13 real-time monitoring cleaning of second pressure sensor
The pressure value and pressure difference in area 5 and bag-type dust area 4 determine pulse ash remover 7 by above-mentioned pressure value and pressure difference
Injection opportunity；
Step 5：PLC control system 9 passes through the practical temperature in second temperature sensor 12 in real time monitoring bag-type dust area 4
Degree is compared by actual temperature and operating temperature to determine the working frequency of air-introduced machine 8；
Step 6：The dust of bag-type dust collector 6 enters under the action of pulse ash remover 7 is blown in circulating slot 20；
Step 7：Pipeline 22 is supplemented by desalted water in urea liquid slot 18 and is supplemented with desalted water, in urea liquid slot 18
Desalted water entered step in the circulating slot 20 described in six by urea solution pump 16 and nozzle 21 combined with dust to be formed it is dilute
Urea liquid；
Step 8：Dilute urea solution is entered by pipeline in urea liquid slot 18, when densitometer 15 detects dilute urea solution
A concentration of 10%~40% when, open urea liquid discharge valve 17, the urea liquid in urea liquid slot 18 made to pass through urine
Plain solution discharge valve 17 enters in urea liquid retracting device 19, recycling；
Step 9：Urea liquid closes urea liquid discharge valve 17 after entering urea liquid retracting device 19, makes simultaneously
Desalted water supplement pipeline 22 fills into desalted water into urea liquid slot 18；
Step 10：When the concentration that densitometer 15 detects dilute urea solution is not more than 10%~40%, urea liquid is opened
Pump 16 makes dilute urea solution enter and continues to dilute the dust fallen in bag-type dust collector 6 in circulating slot 20.
Pressure in the step 4 in 11 real-time monitoring cleaning area 5 of first pressure sensor, second pressure sensor 13
Pressure in monitoring bag-type dust area 4 in real time；And it will be in above-mentioned real-time data transmission to PLC control system 9；The first pressure
Pressure difference between sensor 11 and second pressure sensor 13 is 700Pa~1200Pa；When first pressure sensor 11 and
When pressure difference between two pressure sensors 13 is more than 1200Pa, PLC control system 9 controls pulse ash remover 7 and starts, high pressure
Gas carries out blowback by bleed pipe and blowing head to bag-type dust collector 6, carries out dust and handles；To reduce first pressure
Pressure difference between sensor 11 and second pressure sensor 13 is allowed to be down within 700Pa~1200Pa.
Second temperature sensor 12 monitors the temperature in bag-type dust area 4 in real time in the step 5；The bag-type dust
Temperature in area 4 is 30 DEG C~60 DEG C.
When the temperature when in bag-type dust area 4 is less than 30 DEG C, PLC control system 9 controls the frequency drop of air-introduced machine 8
It is low, so that the temperature in bag-type dust area 4 is reached 30 DEG C~60 DEG C to reach；When the temperature in bag-type dust area 4 is more than 60 DEG C
When, the frequency that PLC control system 9 controls air-introduced machine 8 increases, and makes the temperature in bag-type dust area 4 be when reaching 30 DEG C~60 DEG C
Only.
The present invention has found that urea or composite fertilizer's dust are bonded in the surface of cloth bag and institute in bag-type dust collector according to research
There is close relationships, such as temperature and humidity for environment in region, exist just because of above-mentioned reason bag-type dust collector
Summer can not be with granulation tower with the use of being dusted, and temperature has close pass with the operating temperature in environment temperature and granulation tower
System, humidity has direct relation with the desalination water evaporation in ambient humidity and retracting device, and humidity is inside dust pelletizing system
The pressure difference for showing as dedusting area and clear area；It is proved by a large amount of research and experiment, granulation tower and fiber bag precipitator
It is 30 DEG C~60 DEG C to coordinate best operating temperature, and pressure difference should be 700~1200Pa；And above-mentioned operating temperature and pressure
Difference is to solve the emphasis on the surface that urea or composite fertilizer's dust are bonded in cloth bag；The present invention is mainly the frequency by adjusting air-introduced machine
Rate adjusts dust pelletizing system internal temperature by the rate of ventilation, and pressure difference mistake is solved by the injection of pulse ash remover 7
Big problem, to realize the long-play of dust pelletizing system.It should be noted that heretofore described urea liquid recycling
Device 19 is the flash tank, urea liquid slot or ammonia vessel for preparing urea or composite fertilizer；Heretofore described pulse dust cleaning dress
It is equipped with the equipment such as high pressure tank or plenum chamber in setting, above equipment can be by bleed pipe and blowing head to bag-type dust collector
6 are blown, and are controlled by pulse ash remover.The first temperature sensor 10 in the present invention is clear for detecting
Temperature in clean area 5；It is used in addition, the liquid level gauge 14 of the present invention can coordinate desalted water to supplement the valve in pipeline 22, to reach
Best water compensating state, above equipment, which may be used, to be manually controlled while also can be with PLC control system 9 to reach automatic adjustment
Purpose.
In order to more clearly explain the present invention, it is further described in conjunction with specific embodiment.It is specific real
Under applying for example：
Embodiment one
A kind of tower granulation tail gas dust cleaning apparatus, including mechanical part and control section, a, mechanical structure portion include interior
Portion is equipped with the granulation tower 1 with prilling spry 2, and the top of prilling spry 2 is equipped with device for recovering powder, 1 top of granulation tower and dedusting
System is connected, and the dust pelletizing system includes dedusting shell 3, and dedusting shell 3 is internally provided with bag-type dust area 4, bag-type dust
The top in area 4 is equipped with clear area 5, and bag-type dust collector 6, the dedusting shell at 6 top of bag-type dust collector are equipped in bag-type dust area 4
Pulse ash remover 7 is installed, the top circumference of dedusting shell 3 is equipped with several air-introduced machines 8 on body 3；B, control unit subpackage
PLC control system 9 is included, the signal input part of the PLC control system 9 is passed with first pressure sensor 11, second temperature respectively
Sensor 12 is connected with second pressure sensor 13, the signal output end of PLC control system 9 respectively with air-introduced machine 8 and pulse dust cleaning
Device 7 is connected；The first pressure sensor 11 is arranged in clear area 5, second temperature sensor 12 and second pressure sensing
Device 13 is arranged in bag-type dust area 4.The first temperature sensor 10 is equipped in the clear area 5.The device for recovering powder packet
The circulating slot 20 for being located at 6 bottom of bag-type dust collector is included, 20 internal upper part of circulating slot is equipped with nozzle 21, and the bottom of circulating slot 20 passes through
Pipeline is connected with urea liquid slot 18, and the lower part of urea liquid slot 18 is connected by urea solution pump 16 with nozzle 21；Urea is molten
The top of liquid bath 18 is equipped with desalted water and supplements pipeline 22, and the bottom of urea liquid slot 18 passes through urea liquid discharge valve 17 and urine
Plain solution recovery device 19 is connected.The urea liquid slot 18 is equipped with liquid level gauge 14 and densitometer 15.The PLC control system
9 signal input part is connected with densitometer 15, and the signal output end of PLC control system 9 is connected with urea liquid discharge valve 17.
The air-introduced machine 8 is 20 frequency converting induced draft fans, and the maximum frequency of 20 frequency converting induced draft fans is not more than 50Hz.
A kind of dust removal method of tower granulation tail gas dust cleaning apparatus, the dust removal method include the following steps：
Step 1：The cold air for coming from granulation tower 1 exchanges heat with the urea liquid particle for coming from prilling spry 2,
Form dusty gas；
Step 2：Dusty gas described in step 1 is under the action of air-introduced machine 8, by bag-type dust collector 6 by powder
After dirt filters out, clean gas enters in clear area 5；
Step 3：Pure air in clean room 5 is discharged by air-introduced machine 8 in air；
Step 4：PLC control system 9 passes through first pressure sensor 11 and 13 real-time monitoring cleaning of second pressure sensor
The pressure value and pressure difference in area 5 and bag-type dust area 4 determine pulse ash remover 7 by above-mentioned pressure value and pressure difference
Injection opportunity；
Pressure in 11 real-time monitoring cleaning area 5 of the first pressure sensor, second pressure sensor 13 monitor in real time
Pressure in bag-type dust area 4；And it will be in above-mentioned real-time data transmission to PLC control system 9；The first pressure sensor 11
Pressure difference between second pressure sensor 13 is 1200Pa；
Step 5：PLC control system 9 passes through the practical temperature in second temperature sensor 12 in real time monitoring bag-type dust area 4
Degree is compared by actual temperature and operating temperature to determine the working frequency of air-introduced machine 8；The second temperature sensor 12 is real-time
It is 50 DEG C to monitor the temperature in bag-type dust area 4；
In the range of the present invention allows, remaining equipment keeps the normal operation to be for above-mentioned pressure difference and operating temperature
It can.
Embodiment two
A kind of tower granulation tail gas dust cleaning apparatus, including mechanical part and control section, a, mechanical structure portion include interior
Portion is equipped with the granulation tower 1 with prilling spry 2, and the top of prilling spry 2 is equipped with device for recovering powder, 1 top of granulation tower and dedusting
System is connected, and the dust pelletizing system includes dedusting shell 3, and dedusting shell 3 is internally provided with bag-type dust area 4, bag-type dust
The top in area 4 is equipped with clear area 5, and bag-type dust collector 6, the dedusting shell at 6 top of bag-type dust collector are equipped in bag-type dust area 4
Pulse ash remover 7 is installed, the top circumference of dedusting shell 3 is equipped with several air-introduced machines 8 on body 3；B, control unit subpackage
PLC control system 9 is included, the signal input part of the PLC control system 9 is passed with first pressure sensor 11, second temperature respectively
Sensor 12 is connected with second pressure sensor 13, the signal output end of PLC control system 9 respectively with air-introduced machine 8 and pulse dust cleaning
Device 7 is connected；The first pressure sensor 11 is arranged in clear area 5, second temperature sensor 12 and second pressure sensing
Device 13 is arranged in bag-type dust area 4.The first temperature sensor 10 is equipped in the clear area 5.The device for recovering powder packet
The circulating slot 20 for being located at 6 bottom of bag-type dust collector is included, 20 internal upper part of circulating slot is equipped with nozzle 21, and the bottom of circulating slot 20 passes through
Pipeline is connected with urea liquid slot 18, and the lower part of urea liquid slot 18 is connected by urea solution pump 16 with nozzle 21；Urea is molten
The top of liquid bath 18 is equipped with desalted water and supplements pipeline 22, and the bottom of urea liquid slot 18 passes through urea liquid discharge valve 17 and urine
Plain solution recovery device 19 is connected.The urea liquid slot 18 is equipped with liquid level gauge 14 and densitometer 15.The PLC control system
9 signal input part is connected with densitometer 15, and the signal output end of PLC control system 9 is connected with urea liquid discharge valve 17.
The air-introduced machine 8 is 20 frequency converting induced draft fans, and the maximum frequency of 20 frequency converting induced draft fans is not more than 50Hz.
A kind of dust removal method of tower granulation tail gas dust cleaning apparatus, the dust removal method include the following steps：
Step 1：The cold air for coming from granulation tower 1 exchanges heat with the urea liquid particle for coming from prilling spry 2,
Form dusty gas；
Step 2：Dusty gas described in step 1 is under the action of air-introduced machine 8, by bag-type dust collector 6 by powder
After dirt filters out, clean gas enters in clear area 5；
Step 3：Pure air in clean room 5 is discharged by air-introduced machine 8 in air；
Step 4：PLC control system 9 passes through first pressure sensor 11 and 13 real-time monitoring cleaning of second pressure sensor
The pressure value and pressure difference in area 5 and bag-type dust area 4 determine pulse ash remover 7 by above-mentioned pressure value and pressure difference
Injection opportunity；
Pressure in 11 real-time monitoring cleaning area 5 of the first pressure sensor, second pressure sensor 13 monitor in real time
Pressure in bag-type dust area 4；And it will be in above-mentioned real-time data transmission to PLC control system 9；The first pressure sensor 11
When pressure difference between second pressure sensor 13 is 1250Pa, PLC control system 9 controls pulse ash remover 7 and starts, high
Body of calming the anger carries out blowback by bleed pipe and blowing head to bag-type dust collector 6, carries out dust and handles；To reduce the first pressure
Pressure difference between force snesor 11 and second pressure sensor 13 is reduced to 700Pa；
Step 5：PLC control system 9 passes through the practical temperature in second temperature sensor 12 in real time monitoring bag-type dust area 4
Degree is compared by actual temperature and operating temperature to determine the working frequency of air-introduced machine 8；
When 20 DEG C of the temperature in the monitoring in real time of the second temperature sensor 12 bag-type dust area 4, PLC control system 9 is controlled
The frequency of air-introduced machine 8 processed reduces, and the temperature in bag-type dust area 4 is made to reach 30 DEG C；
Step 6：The dust of bag-type dust collector 6 enters under the action of pulse ash remover 7 is blown in circulating slot 20；
Step 7：Pipeline 22 is supplemented by desalted water in urea liquid slot 18 and is supplemented with desalted water, in urea liquid slot 18
Desalted water entered step in the circulating slot 20 described in six by urea solution pump 16 and nozzle 21 combined with dust to be formed it is dilute
Urea liquid；
Step 8：Dilute urea solution is entered by pipeline in urea liquid slot 18, when densitometer 15 detects dilute urea solution
A concentration of 10% when, open urea liquid discharge valve 17, the urea liquid in urea liquid slot 18 made to pass through urea liquid
Discharge valve 17 enters in urea liquid retracting device 19, recycling；
Step 9：Urea liquid closes urea liquid discharge valve 17 after entering urea liquid retracting device 19, makes simultaneously
Desalted water supplement pipeline 22 fills into desalted water into urea liquid slot 18；
Step 10：When the concentration that densitometer 15 detects dilute urea solution is not more than 10%, urea solution pump 16 is opened, is made
Dilute urea solution, which enters, to be continued to dilute the dust fallen in bag-type dust collector 6 in circulating slot 20.
Embodiment three
A kind of tower granulation tail gas dust cleaning apparatus, including mechanical part and control section, a, mechanical structure portion include interior
Portion is equipped with the granulation tower 1 with prilling spry 2, and the top of prilling spry 2 is equipped with device for recovering powder, 1 top of granulation tower and dedusting
System is connected, and the dust pelletizing system includes dedusting shell 3, and dedusting shell 3 is internally provided with bag-type dust area 4, bag-type dust
The top in area 4 is equipped with clear area 5, and bag-type dust collector 6, the dedusting shell at 6 top of bag-type dust collector are equipped in bag-type dust area 4
Pulse ash remover 7 is installed, the top circumference of dedusting shell 3 is equipped with several air-introduced machines 8 on body 3；B, control unit subpackage
PLC control system 9 is included, the signal input part of the PLC control system 9 is passed with first pressure sensor 11, second temperature respectively
Sensor 12 is connected with second pressure sensor 13, the signal output end of PLC control system 9 respectively with air-introduced machine 8 and pulse dust cleaning
Device 7 is connected；The first pressure sensor 11 is arranged in clear area 5, second temperature sensor 12 and second pressure sensing
Device 13 is arranged in bag-type dust area 4.The first temperature sensor 10 is equipped in the clear area 5.The device for recovering powder packet
The circulating slot 20 for being located at 6 bottom of bag-type dust collector is included, 20 internal upper part of circulating slot is equipped with nozzle 21, and the bottom of circulating slot 20 passes through
Pipeline is connected with urea liquid slot 18, and the lower part of urea liquid slot 18 is connected by urea solution pump 16 with nozzle 21；Urea is molten
The top of liquid bath 18 is equipped with desalted water and supplements pipeline 22, and the bottom of urea liquid slot 18 passes through urea liquid discharge valve 17 and urine
Plain solution recovery device 19 is connected.The urea liquid slot 18 is equipped with liquid level gauge 14 and densitometer 15.The PLC control system
9 signal input part is connected with densitometer 15, and the signal output end of PLC control system 9 is connected with urea liquid discharge valve 17.
The air-introduced machine 8 is 20 frequency converting induced draft fans, and the maximum frequency of 20 frequency converting induced draft fans is not more than 50Hz.
A kind of dust removal method of tower granulation tail gas dust cleaning apparatus, the dust removal method include the following steps：
Step 1：The cold air for coming from granulation tower 1 exchanges heat with the urea liquid particle for coming from prilling spry 2,
Form dusty gas；
Step 2：Dusty gas described in step 1 is under the action of air-introduced machine 8, by bag-type dust collector 6 by powder
After dirt filters out, clean gas enters in clear area 5；
Step 3：Pure air in clean room 5 is discharged by air-introduced machine 8 in air；
Step 4：PLC control system 9 passes through first pressure sensor 11 and 13 real-time monitoring cleaning of second pressure sensor
The pressure value and pressure difference in area 5 and bag-type dust area 4 determine pulse ash remover 7 by above-mentioned pressure value and pressure difference
Injection opportunity；Pressure in 11 real-time monitoring cleaning area 5 of the first pressure sensor, second pressure sensor 13 are supervised in real time
Survey the pressure in bag-type dust area 4；And it will be in above-mentioned real-time data transmission to PLC control system 9；The first pressure sensor
When pressure difference between 11 and second pressure sensor 13 is 1230Pa, PLC control system 9 controls pulse ash remover 7 and starts,
High pressure gas carries out blowback by bleed pipe and blowing head to bag-type dust collector 6, carries out dust and handles；To reduce by first
Pressure difference between pressure sensor 11 and second pressure sensor 13 is reduced to 950Pa；
Step 5：PLC control system 9 passes through the practical temperature in second temperature sensor 12 in real time monitoring bag-type dust area 4
Degree is compared by actual temperature and operating temperature to determine the working frequency of air-introduced machine 8；
When the second temperature sensor 12 monitors the temperature 70 C in bag-type dust area 4 in real time, PLC control system 9 is controlled
The frequency of air-introduced machine 8 processed increases, when the temperature in bag-type dust area 4 being made to reach 60 DEG C until；
Step 6：The dust of bag-type dust collector 6 enters under the action of pulse ash remover 7 is blown in circulating slot 20；
Step 7：Pipeline 22 is supplemented by desalted water in urea liquid slot 18 and is supplemented with desalted water, in urea liquid slot 18
Desalted water entered step in the circulating slot 20 described in six by urea solution pump 16 and nozzle 21 combined with dust to be formed it is dilute
Urea liquid；
Step 8：Dilute urea solution is entered by pipeline in urea liquid slot 18, when densitometer 15 detects dilute urea solution
A concentration of 40% when, open urea liquid discharge valve 17, the urea liquid in urea liquid slot 18 made to pass through urea liquid
Discharge valve 17 enters in urea liquid retracting device 19, recycling；
Step 9：Urea liquid closes urea liquid discharge valve 17 after entering urea liquid retracting device 19, makes simultaneously
Desalted water supplement pipeline 22 fills into desalted water into urea liquid slot 18；
Step 10：When the concentration that densitometer 15 detects dilute urea solution is not more than 40%, urea solution pump 16 is opened, is made
Dilute urea solution, which enters, to be continued to dilute the dust fallen in bag-type dust collector 6 in circulating slot 20.
Example IV
A kind of tower granulation tail gas dust cleaning apparatus, including mechanical part and control section, a, mechanical structure portion include interior
Portion is equipped with the granulation tower 1 with prilling spry 2, and the top of prilling spry 2 is equipped with device for recovering powder, 1 top of granulation tower and dedusting
System is connected, and the dust pelletizing system includes dedusting shell 3, and dedusting shell 3 is internally provided with bag-type dust area 4, bag-type dust
The top in area 4 is equipped with clear area 5, and bag-type dust collector 6, the dedusting shell at 6 top of bag-type dust collector are equipped in bag-type dust area 4
Pulse ash remover 7 is installed, the top circumference of dedusting shell 3 is equipped with several air-introduced machines 8 on body 3；B, control unit subpackage
PLC control system 9 is included, the signal input part of the PLC control system 9 is passed with first pressure sensor 11, second temperature respectively
Sensor 12 is connected with second pressure sensor 13, the signal output end of PLC control system 9 respectively with air-introduced machine 8 and pulse dust cleaning
Device 7 is connected；The first pressure sensor 11 is arranged in clear area 5, second temperature sensor 12 and second pressure sensing
Device 13 is arranged in bag-type dust area 4.The first temperature sensor 10 is equipped in the clear area 5.The device for recovering powder packet
The circulating slot 20 for being located at 6 bottom of bag-type dust collector is included, 20 internal upper part of circulating slot is equipped with nozzle 21, and the bottom of circulating slot 20 passes through
Pipeline is connected with urea liquid slot 18, and the lower part of urea liquid slot 18 is connected by urea solution pump 16 with nozzle 21；Urea is molten
The top of liquid bath 18 is equipped with desalted water and supplements pipeline 22, and the bottom of urea liquid slot 18 passes through urea liquid discharge valve 17 and urine
Plain solution recovery device 19 is connected.The urea liquid slot 18 is equipped with liquid level gauge 14 and densitometer 15.The PLC control system
9 signal input part is connected with densitometer 15, and the signal output end of PLC control system 9 is connected with urea liquid discharge valve 17.
The air-introduced machine 8 is 20 frequency converting induced draft fans, and the maximum frequency of 20 frequency converting induced draft fans is not more than 50Hz.
A kind of dust removal method of tower granulation tail gas dust cleaning apparatus, the dust removal method include the following steps：
Step 1：The cold air for coming from granulation tower 1 exchanges heat with the urea liquid particle for coming from prilling spry 2,
Form dusty gas；
Step 2：Dusty gas described in step 1 is under the action of air-introduced machine 8, by bag-type dust collector 6 by powder
After dirt filters out, clean gas enters in clear area 5；
Step 3：Pure air in clean room 5 is discharged by air-introduced machine 8 in air；
Step 4：PLC control system 9 passes through first pressure sensor 11 and 13 real-time monitoring cleaning of second pressure sensor
The pressure value and pressure difference in area 5 and bag-type dust area 4 determine pulse ash remover 7 by above-mentioned pressure value and pressure difference
Injection opportunity；
Pressure in 11 real-time monitoring cleaning area 5 of the first pressure sensor, second pressure sensor 13 monitor in real time
Pressure in bag-type dust area 4；And it will be in above-mentioned real-time data transmission to PLC control system 9；The first pressure sensor 11
When pressure difference between second pressure sensor 13 is 1300Pa, PLC control system 9 controls pulse ash remover 7 and starts, high
Body of calming the anger carries out blowback by bleed pipe and blowing head to bag-type dust collector 6, carries out dust and handles；To reduce the first pressure
Pressure difference between force snesor 11 and second pressure sensor 13 is reduced to 800Pa；
Step 5：PLC control system 9 passes through the practical temperature in second temperature sensor 12 in real time monitoring bag-type dust area 4
Degree is compared by actual temperature and operating temperature to determine the working frequency of air-introduced machine 8；The second temperature sensor 12 is real-time
Monitor the temperature in bag-type dust area 4；When temperature in the bag-type dust area 4 is 65 DEG C, PLC control system 9 controls air inducing
The frequency of machine 8 increases, when the temperature in bag-type dust area 4 being made to reach 45 DEG C until；
Step 6：The dust of bag-type dust collector 6 enters under the action of pulse ash remover 7 is blown in circulating slot 20；
Step 7：Pipeline 22 is supplemented by desalted water in urea liquid slot 18 and is supplemented with desalted water, in urea liquid slot 18
Desalted water entered step in the circulating slot 20 described in six by urea solution pump 16 and nozzle 21 combined with dust to be formed it is dilute
Urea liquid；
Step 8：Dilute urea solution is entered by pipeline in urea liquid slot 18, when densitometer 15 detects dilute urea solution
A concentration of 25% when, open urea liquid discharge valve 17, the urea liquid in urea liquid slot 18 made to pass through urea liquid
Discharge valve 17 enters in urea liquid retracting device 19, recycling；
Step 9：Urea liquid closes urea liquid discharge valve 17 after entering urea liquid retracting device 19, makes simultaneously
Desalted water supplement pipeline 22 fills into desalted water into urea liquid slot 18；
Step 10：When the concentration that densitometer 15 detects dilute urea solution is not more than 25%, urea solution pump 16 is opened, is made
Dilute urea solution, which enters, to be continued to dilute the dust fallen in bag-type dust collector 6 in circulating slot 20.
Embodiment five
Pressure difference between first pressure sensor 11 described in the present embodiment and second pressure sensor 13 is 700Pa；
Remaining is identical as embodiment one；In the range of the present invention allows, remaining equipment is kept for above-mentioned pressure difference and operating temperature
Normal operation.
Experimental example six
Pressure difference between first pressure sensor 11 described in the present embodiment and second pressure sensor 13 is 950Pa；
Remaining is identical as embodiment one；In the range of the present invention allows, remaining equipment is kept for above-mentioned pressure difference and operating temperature
Normal operation.
Experimental example
Particle is carried out to it in the course of work of above-described embodiment one, embodiment two, embodiment three and example IV
Analyte detection, the unit that examining report is provided are：Co., Ltd of research institute, report number detect in political affairs institute of Henan Province：
ZYTHJB2018-0176, detection type：Commission detection；By inspection unit：Four branch company of Henan XInlianxin Fertiliser Limited Company, inspection
Geodetic location：Xinxiang City economic and technological development zone Green Dragon road four branch company of chemical fertilizer Co., Ltd heart linked to heart；Detect classification：Exhaust gas；Label
Send out the date：On March 30th, 2018；Date collected：Analyze the date on March 23rd, 2018：In March, -2018 on March 23rd, 2018
25 days；Exhaust air rate is 2.37 × 10 in embodiment one5m3/ h, concentration of emission 3.15mg/m3, rate of discharge 0.747kg/h；Implement
Exhaust air rate is 2.35 × 10 in example two5m3/ h, concentration of emission 2.98mg/m3, rate of discharge 0.700kg/h；Air draft in embodiment three
Amount is 2.50 × 105m3/ h, concentration of emission 3.72mg/m3, rate of discharge 0.930kg/h；In example IV exhaust air rate be 2.50 ×
105m3/ h, concentration of emission 3.17mg/m3, rate of discharge 0.793kg/h.By the result of above-mentioned examining report it is found that the present invention
Mode of the dust discharge amount well below existing washing dedusting and corresponding national standard.
In the description of the present invention, it is to be understood that, the orientation of term " end ", " inner wall ", " front end " etc. instruction
Or position relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, and
It is not that the device of instruction or hint meaning or element must have a particular orientation, with specific azimuth configuration and operation, therefore
It is not considered as limiting the invention.In the description of the present invention, it should be noted that unless otherwise specific regulation and limit
Fixed, term " being equipped with ", " installation ", " connected " etc. shall be understood in a broad sense, for example, it may be being fixedly connected, be integrally connected,
Can be detachably connected；It can also be the connection inside two elements；It can be directly connected, intermediary can also be passed through
It is indirectly connected, for the ordinary skill in the art, can understand above-mentioned term as the case may be in the present invention
Concrete meaning.Finally illustrating, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although
The present invention is described in detail by above preferred embodiment, however, those skilled in the art should understand that, can be with
Various changes are made to it in the form and details, without departing from claims of the present invention limited range.
Claims (10)
1. a kind of tower granulation tail gas dust cleaning apparatus, the device include mechanical part and control section, it is characterised in that：
A, mechanical structure portion includes being internally provided with the granulation tower (1) with prilling spry (2), and the top of prilling spry (2) is equipped with
Device for recovering powder, granulation tower (1) top are connected with dust pelletizing system, and the dust pelletizing system includes dedusting shell (3), dedusting shell
Body (3) is internally provided with bag-type dust area (4), and the top of bag-type dust area (4) is equipped with clear area (5), in bag-type dust area (4)
Equipped with bag-type dust collector (6), pulse ash remover (7) is installed on the dedusting shell (3) at the top of bag-type dust collector (6),
The top circumference of dedusting shell (3) is equipped with several air-introduced machines (8)；
B, control section includes PLC control system (9), the signal input part of the PLC control system (9) respectively with first pressure
Sensor (11), second temperature sensor (12) are connected with second pressure sensor (13), and the signal of PLC control system (9) is defeated
Outlet is connected with air-introduced machine (8) and pulse ash remover (7) respectively；The first pressure sensor (11) is arranged in clear area
(5) in, second temperature sensor (12) and second pressure sensor (13) are arranged in bag-type dust area (4).
2. a kind of tower granulation tail gas dust cleaning apparatus according to claim 1, it is characterised in that：In the clear area (5)
Equipped with the first temperature sensor (10).
3. a kind of tower granulation tail gas dust cleaning apparatus according to claim 1, it is characterised in that：The device for recovering powder
Circulating slot (20) including being located at bag-type dust collector (6) bottom, circulating slot (20) internal upper part are equipped with nozzle (21), circulating slot
(20) bottom is connected by pipeline with urea liquid slot (18), and the lower part of urea liquid slot (18) passes through urea solution pump (16)
It is connected with nozzle (21)；The top of urea liquid slot (18) is equipped with desalted water supplement pipeline (22), the bottom of urea liquid slot (18)
Portion is connected by urea liquid discharge valve (17) with urea liquid retracting device (19).
4. a kind of tower granulation tail gas dust cleaning apparatus according to claim 1, it is characterised in that：The urea liquid slot
(18) liquid level gauge (14) and densitometer (15) are equipped with.
5. a kind of tower granulation tail gas dust cleaning apparatus according to claim 1, it is characterised in that：The PLC control system
(9) signal input part is connected with densitometer (15), signal output end and the urea liquid discharge valve of PLC control system (9)
(17) it is connected.
6. a kind of tower granulation tail gas dust cleaning apparatus according to claim 1, it is characterised in that：The air-introduced machine (8) is
The maximum frequency of 20 frequency converting induced draft fans, 20 frequency converting induced draft fans is not more than 50Hz.
7. a kind of dust removal method of tower granulation tail gas dust cleaning apparatus as described in claim 1-6, it is characterised in that：The dedusting
Method includes the following steps：
Step 1：The cold air for coming from granulation tower (1) exchanges heat with the urea liquid particle for coming from prilling spry (2),
Form dusty gas；
Step 2：Dusty gas described in step 1 is under the action of air-introduced machine 8, by bag-type dust collector (6) by dust
After filtering out, clean gas enters in clear area (5)；
Step 3：Pure air in clean room (5) is discharged by air-introduced machine (8) in air；
Step 4：Monitoring is clear in real time by first pressure sensor (11) and second pressure sensor (13) for PLC control system (9)
The pressure value and pressure difference of clean area (5) and bag-type dust area (4), pulse dust cleaning is determined by above-mentioned pressure value and pressure difference
The injection opportunity of device (7)；
Step 5：PLC control system (9) passes through the reality in second temperature sensor (12) in real time monitoring bag-type dust area (4)
Temperature is compared by actual temperature and operating temperature to determine the working frequency of air-introduced machine (8)；
Step 6：The dust of bag-type dust collector (6) enters circulating slot (20) under the action of pulse ash remover (7) are blown
It is interior；
Step 7：Pipeline (22) is supplemented by desalted water in urea liquid slot (18) and is supplemented with desalted water, urea liquid slot (18)
Interior desalted water by urea solution pump (16) and nozzle (21) enter step in the circulating slot (20) described in six with dust knot
Conjunction forms dilute urea solution；
Step 8：Dilute urea solution is entered by pipeline in urea liquid slot (18), when densitometer (15) detects dilute urea solution
A concentration of 10%~40% when, open urea liquid discharge valve (17), keep urea liquid in urea liquid slot (18) logical
It crosses urea liquid discharge valve (17) to enter in urea liquid retracting device (19), recycling；
Step 9：Urea liquid enters urea liquid retracting device (19) and closes urea liquid discharge valve (17) afterwards, makes simultaneously
Desalted water supplement pipeline (22) fills into desalted water into urea liquid slot (18)；
Step 10：When the concentration that densitometer (15) detects dilute urea solution is not more than 10%~40%, urea solution pump is opened
(16), make dilute urea solution enter to continue to dilute the dust fallen in bag-type dust collector (6) in circulating slot (20).
8. a kind of dust removal method of tower granulation tail gas dust cleaning apparatus according to claim 7, it is characterised in that：The step
Pressure in rapid four in the real-time monitoring cleaning area (5) of first pressure sensor (11), second pressure sensor (13) monitor in real time
Pressure in bag-type dust area (4)；And it will be in above-mentioned real-time data transmission to PLC control system (9)；The first pressure sensing
Pressure difference between device (11) and second pressure sensor (13) is 700Pa~1200Pa；When first pressure sensor (11) with
When pressure difference between second pressure sensor (13) is more than 1200Pa, PLC control system (9) controls pulse ash remover (7)
Start, high pressure gas carries out blowback by bleed pipe and blowing head to bag-type dust collector (6), carries out dust and handles；With
The pressure difference between first pressure sensor (11) and second pressure sensor (13) is reduced, is allowed to be down to 700Pa~1200Pa
Within.
9. a kind of dust removal method of tower granulation tail gas dust cleaning apparatus according to claim 7, it is characterised in that：The step
Temperature in rapid five in second temperature sensor (12) monitoring bag-type dust area (4) in real time；Temperature in the bag-type dust area (4)
Degree is 30 DEG C~60 DEG C.
10. a kind of dust removal method of tower granulation tail gas dust cleaning apparatus according to claim 9, it is characterised in that：It is described
When the temperature in bag-type dust area (4) is less than 30 DEG C, the frequency that PLC control system (9) controls air-introduced machine (8) reduces, to
Reaching makes the temperature in bag-type dust area (4) reach 30 DEG C~60 DEG C；When the temperature in bag-type dust area (4) is more than 60 DEG C,
The frequency of PLC control system (9) control air-introduced machine (8) increases, when the temperature in bag-type dust area (4) being made to reach 30 DEG C~60 DEG C
Until.
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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 |
| CN110404351A (en) * | 2019-08-29 | 2019-11-05 | 上海境业环保能源科技股份有限公司 | A kind of urea prilling tower dust pelletizing system with maintenance of fan 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 |
| CN113521899A (en) * | 2021-07-29 | 2021-10-22 | 福建龙净环保股份有限公司 | Ash removal method of bag type dust collector |
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| CN108465437B (en) | 2023-09-01 |
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