CN103332494B - Pneumatic conveying method for removing dust and crude ash in dry process of converter once flue gas - Google Patents
Pneumatic conveying method for removing dust and crude ash in dry process of converter once flue gas Download PDFInfo
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- CN103332494B CN103332494B CN201310267959.7A CN201310267959A CN103332494B CN 103332494 B CN103332494 B CN 103332494B CN 201310267959 A CN201310267959 A CN 201310267959A CN 103332494 B CN103332494 B CN 103332494B
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Abstract
The invention relates to a pneumatic conveying method for removing dust and crude ash in a dry process of converter once flue gas. The method comprises the following steps of S1, constructing a pneumatic conveying system for removing dust and crude ash in the dry process of converter once flue gas; S2, feeding: a signal is sent when a material level meter (3) detects crude ash in a lower funnel of an evaporative cooling tower (1) reaching an upper limit, ash is discharged into a cabin pump (10), and a vibrating and striking device (2) works; S3, fluidization: a pneumatic ball valve (15) is started, nitrogen enters into a first fluidization device in the cabin pump (10) from a gas storage tank (14); S4, conveying: after a second pneumatic double-gate plate valve (16) is opened, the uniformly fluidized gas and ash mixture is conveyed into a crude ash cabin (18) through a pneumatic conveying pipe (17); S5, blowing and sweeping, and S6, moving by transportation. By adopting the method, a common ash transportation cart can be used for transporting ash, the investment is greatly lowered, and the cost is saved. The method solves the problem that the height of the evaporative cooling tower is limited during the transformation of dust removal in the dry process, the method is particularly suitable for the project that dust removal of once flue gas in a converter via a wet process is transformed into a dry process, and the method has wide application prospect.
Description
Technical field
The present invention relates to field of Environment Protection, more particularly, relate to a kind of converter dry fume dedusting cinder pneumatic conveying method.
Background technology
Along with the continuous reinforcement of environmental consciousness, converter flue gas that is newly-built and reconstruction mostly adopts dry method dust.The cinder that below wet cooling tower, banana-bends is collected delivers to the cinder storehouse in converter main building under gravity by built-in chain-linked conveyer, pneumatic gate valve and pneumatic double-layer flap valve, transported outward after humidification by automobile.
Existing converter main Problems existing of dry fume dedusting cinder delivery system: one is that built-in chain-linked conveyer fault rate is high, often blocks ash, has a strong impact on converter and normally produce; Two is that cinder storehouse is located in converter main building, is often subject to the restriction of process for making arrangement condition, consider to occupy a large amount of interior spaces by the fortune ash passage that automobile passes in and out; Three be each price of vacuum suction and discharge tank car at about 1,000,000 yuan, invest higher.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of prior art, provides a kind of converter a dry fume dedusting cinder pneumatic conveying method.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of converter dry fume dedusting cinder pneumatic conveying method, comprise the following steps:
S1, structure converter dry fume dedusting cinder air-transport system, it comprise connect successively wet cooling tower, ash-unloading tube, storehouse pump, pneumatic carrier and cinder storehouse; Level-sensing device and rapping apparatus is provided with in wet cooling tower; Described ash-unloading tube is provided with pneumatic gate valve and the first Pneumatic double gate valve; Pump top, described storehouse is provided with the first vacuum pressure Dump valve; Described pneumatic carrier is connected with storage tank, and the entrance of described storage tank is connected with the first nitrogen tube, and the entrance of described first nitrogen tube is connected with nitrogen header pipe; Described storehouse pump is connected by pneumatic carrier with cinder storehouse, and described pneumatic carrier is provided with the second Pneumatic double gate valve, is provided with first class device bottom the pump of described storehouse; The nitrogen tube of described reservoir outlet is divided into two-way, and a road is connected with described first class device, and another road is connected with described pneumatic carrier, is provided with pneumatic ball valve between described storage tank and storehouse pump; Bag dust collector and the second vacuum pressure Dump valve are established in top, described cinder storehouse, second gasifying device is provided with in cone bucket under described cinder storehouse, the cinder-discharging port of the lower cone bucket bottom described cinder storehouse is connected with the second hand operated gate valve entrance, and described second hand operated gate valve outlet is connected with dust humidifying agitator entrance; The outlet of described dust humidifying agitator is connected by ash releasing tube with canvas hose entrance; Described nitrogen header pipe is also connected with the second nitrogen tube entrance, and described second nitrogen tube outlet is divided into two-way, and a road is connected with fluidizer, and another Lu Yucang pushes up bag dust collector and connects; Pressure regulating valve and electromagnetic valve is established between second nitrogen tube and second gasifying device;
S2, charging: level-sensing device is bored when the cinder in struggling against reaches upper limit under wet cooling tower being detected and sent signal, start to unload ash to storehouse pump, pneumatic gate valve and the first Pneumatic double gate valve are opening, pneumatic ball valve and the second Pneumatic double gate valve are closed, rapping apparatus works, cinder enters storehouse pump under gravity, after the level-sensing device carried when storehouse pump detects that material is full, send signal and by PLC programming control, automatic closedown first Pneumatic double gate valve and the 3rd Pneumatic double gate valve, fill process terminates;
S3, fluidisation: pneumatic ball valve is opened, nitrogen enters the first class device in the pump of storehouse from storage tank, the abundant fluidisation of cinder in the pump of storehouse, pressure constantly raises, when pressure rises to setting operation pressure, by PLC programming control, automatically open the second Pneumatic double gate valve of pump side portion, storehouse discharge outlet, fluid mapper process terminates;
S4, conveying: after the second Pneumatic double gate valve is opened, fluidisation uniform gas ash compound delivers to cinder storehouse by pneumatic carrier, the pressure remained steady now in the pump of storehouse; After the gas ash compound in the pump of storehouse has been carried, the resistance of pneumatic carrier has declined, and the pressure of pneumatic carrier starts to reduce, when being reduced to the threshold pression of setting, then course of conveying terminates, and enters purge, and now pneumatic ball valve and the second Pneumatic double gate valve still remain on opening;
S5, purging: nitrogen continues purge bin pump and pneumatic carrier, now storehouse pump is interior without flying dust, gas ash compound in pneumatic carrier reduces gradually, last is all almost nitrogen, systemic resistance continues to decline and after a period of stabilisation, purge terminates, and closes pneumatic ball valve and the second Pneumatic double gate valve, then open the first Pneumatic double gate valve and the 3rd Pneumatic double gate valve, storehouse pump recovers feed state;
S6, migration: open electromagnetic valve, nitrogen passes in second gasifying device, and fluidisation cinder opens the second hand operated gate valve, and the cinder in cinder storehouse, after dust humidifying agitator humidification, is joined in bulk cement truck by ash releasing tube and canvas hose.
In step S2 in converter of the present invention dry fume dedusting cinder pneumatic conveying method, the cinder detected under wet cooling tower in cone bucket when the level-sensing device in wet cooling tower unloads and sends signal to during lower limit, stops unloading ash to storehouse pump.
In converter of the present invention dry fume dedusting cinder pneumatic conveying method, described converter is decarburization converter or dephosphorization converter or lava homogenizing furnace or stainless steel.
In converter of the present invention dry fume dedusting cinder pneumatic conveying method, the nitrogen pressure >=0.6MPa carried in described step S3-S6.
Implement converter of the present invention dry fume dedusting cinder pneumatic conveying method, there is following beneficial effect:
1, number of devices and plant maintenance amount is decreased.Dismountable cover banana-bends and built-in chain-linked conveyer, solve the problem of built-in chain-linked conveyer card ash, decrease equipment failure rate, ensured that converter is normally produced.
2, cinder storehouse both can be placed in converter main building, also can be placed on outside converter main building, and storage ash and fortune ash are not subject to the restriction of place and distance.
3, after the present invention adopts dust humidifying agitator, common bulk cement truck can be adopted to transport ash, greatly reduce investment, cost-saving.
4, the invention solves the problem that when dry method dust is transformed, wet cooling tower is height-limited, be especially applicable to converter flue-gas wet dust removal and change dry method dust project, have a extensive future.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of the cinder air-transport system in converter of the present invention dry fume dedusting cinder pneumatic conveying method.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
A kind of converter of the present invention dry fume dedusting cinder pneumatic conveying method, comprises step S1-S6, specific as follows:
S1, structure converter dry fume dedusting cinder air-transport system, as shown in Figure 1, it comprise connect successively wet cooling tower 1, ash-unloading tube 4, storehouse pump 10, pneumatic carrier 17 and cinder storehouse 18.
The lower cone bucket of wet cooling tower 1, for trapping the cinder in raw coke oven gas, is provided with level-sensing device 3 and rapping apparatus 2 in wet cooling tower 1.The cinder amount in wet cooling tower 1 can be detected by level-sensing device 3, can ensure that cinder can fall in ash-unloading tube 4 smoothly by rapping apparatus 2, prevent blocking.Storehouse pump 10 is arranged on the below of wet cooling tower 1, and the cinder-discharging port of the lower cone bucket of wet cooling tower 1 is connected by ash-unloading tube 4 with storehouse pump 10 entrance, and ash-unloading tube 4 is provided with pneumatic gate valve 5 and the first Pneumatic double gate valve 6.When pneumatic gate valve 5 and the first Pneumatic double gate valve 6 are opened, the cinder of wet cooling tower 1 inside is fallen in storehouse pump 10 by ash-unloading tube 4.The top of storehouse pump 10 is provided with the first vacuum pressure Dump valve 12, prevents storehouse pump 10 internal pressure excessive.
Pneumatic carrier 17 is connected with storage tank 14, and the entrance of storage tank 14 is connected with the first nitrogen tube 13, and the entrance of the first nitrogen tube 13 is connected with nitrogen header pipe.Storehouse pump 10 is connected by pneumatic carrier 17 with cinder storehouse 18, and pneumatic carrier 17 is provided with the second Pneumatic double gate valve 16, is provided with first class device bottom storehouse pump 10.
The nitrogen tube that storage tank 14 exports is divided into two-way, and a road is connected with first class device, and another road is connected with pneumatic carrier 17, is provided with pneumatic ball valve 15 between storage tank 14 and storehouse pump 10.
Bag dust collector 19 and the second vacuum pressure Dump valve 20 are established in top, cinder storehouse 18.Top, storehouse bag dust collector 19 is for collecting the dust at top, cinder storehouse 18.Second vacuum pressure Dump valve 20 is for preventing cinder storehouse 18 internal pressure excessive.Second gasifying device 30 is provided with in the cone bucket of 18 times, cinder storehouse, the cinder-discharging port of the 18 times cone buckets in cinder storehouse is connected with the second hand operated gate valve 21 entrance, second hand operated gate valve 21 outlet is connected with dust humidifying agitator 22 entrance, and the outlet of dust humidifying agitator 22 is connected by ash releasing tube 23 with canvas hose 24 entrance.
Nitrogen header pipe is also connected with the second nitrogen tube 27 entrance, and the second nitrogen tube 27 outlet is divided into two-way, and a road is connected with second gasifying device 30, and another Lu Yucang pushes up bag dust collector 19 and connects.Pressure regulating valve 28 and electromagnetic valve 29 is established between second nitrogen tube 27 and second gasifying device 30.
S2, charging: level-sensing device 3 detects that the cinder in wet cooling tower 1 time cone bucket sends signal when reaching upper limit, start to unload ash to storehouse pump 10, pneumatic gate valve 5 and the first Pneumatic double gate valve 6 are in opening, pneumatic ball valve 15 and the second Pneumatic double gate valve 16 are closed, cinder enters storehouse pump 10 under gravity, after the level-sensing device carried when storehouse pump 10 detects that material is full, sends signal and by PLC programming control, automatic closedown first Pneumatic double gate valve 6, fill process terminates.Can charging be affected when pressure in storehouse pump 10 is excessive, now can open the first vacuum pressure Dump valve 12.When dust-laden raw coke oven gas is by wet cooling tower 1 time cone bucket, owing to flowing to the change of generation more than 90 °, under the effect of gravity and centnifugal force, the crude particle dust of 25% ~ 35% (being generally 30%) is captured at lower cone bucket place; Crude particle dust temperature is 200 ~ 300 DEG C (being generally 250 DEG C); Crude particle dust bulk density 1.8 ~ 2.6t/m3; Crude particle dust water ratio 3% ~ 5%.
S3, fluidisation: pneumatic ball valve 15 is opened, nitrogen enters the first class device in storehouse pump 10 from storage tank 14, the abundant fluidisation of cinder in storehouse pump 10, pressure constantly raises, when pressure rises to setting operation pressure, by PLC programming control, automatically open the second Pneumatic double gate valve 16 of storehouse pump 10 sidepiece discharge outlet, fluid mapper process terminates.
S4, conveying: after the second Pneumatic double gate valve 16 is opened, fluidisation uniform gas ash compound delivers to cinder storehouse 18 by pneumatic carrier 17, the pressure remained steady now in storehouse pump 10; After the gas ash compound in storehouse pump 10 has been carried, the resistance of pneumatic carrier 17 declines, the pressure of pneumatic carrier 17 starts to reduce, when being reduced to the threshold pression of setting, then course of conveying terminates, enter purge, now pneumatic ball valve 15 and the second Pneumatic double gate valve 16 still remain on opening.Can charging be affected when pressure in cinder storehouse 18 is excessive, now can open the second vacuum pressure Dump valve 20.
S5, purging: nitrogen continues purge bin pump 10 and pneumatic carrier 17, now storehouse pump 10 is interior without flying dust, gas ash compound in pneumatic carrier 17 reduces gradually, last is all almost nitrogen, systemic resistance continues to decline and after a period of stabilisation, purge terminates, and closes pneumatic ball valve 15 and the second Pneumatic double gate valve 16, then open the first Pneumatic double gate valve 6, storehouse pump 10 recovers feed state.
S6, migration: open electromagnetic valve 29, nitrogen passes in second gasifying device 28, fluidisation cinder, opens the second hand operated gate valve 21, cinder in cinder storehouse 18, after dust humidifying agitator 22 humidification, is joined in bulk cement truck by ash releasing tube 23 and canvas hose 24.Unload ash and can adopt common bulk cement truck fortune ash, cost is low.Second gasifying device 38 sprays low-pressure nitrogen, can reduce the temperature of cinder in cinder storehouse 18, also can fluidisation cinder, is convenient to unload ash.The intake of nitrogen can be regulated by pressure regulating valve 28.Top, the storehouse cinder collected of bag dust collector 19 is delivered to bottom cinder storehouse 18 by the second nitrogen tube 27, ensures that cinder in cinder storehouse 18 can discharging fully fast, reduces residual.
Storehouse pump 10 in the present invention adopts the mode of being interrupted conveying, and often carry a cinder, be a cyclic process, each circulation comprises S2-S5 totally 4 steps.
Further, in step s 2, the cinder detected in wet cooling tower 1 time cone bucket when the level-sensing device 3 in wet cooling tower 1 unloads and sends signal to during lower limit, stops unloading ash to storehouse pump 10.Ash envelope in wet cooling tower 1 time cone bucket can prevent coal gas excessive, ash envelope height 800 ~ 1000mm.
Further, the pumped (conveying) medium in step S3-S6 adopts low-pressure nitrogen, nitrogen pressure >=0.6MPa.
Further, can bore under wet cooling tower on bucket and the first accident ash-unloading tube 7, first accident ash-unloading tube 7 is set is provided with the first hand operated gate valve 9.When storehouse pump 10 overhauls, cinder is discharged through wet cooling tower 1 time cone bucket accident cinder-discharging port, the first accident ash-unloading tube 7 and the first hand operated gate valve 9.Be provided with connection pipe 8 between ash-unloading tube 4 and the first accident ash-unloading tube 7, be mainly used to get rid of the accident ponding in wet cooling tower 1 time cone bucket.Also can drain hose be set bottom storehouse pump 10, for discharging the ponding in storehouse pump 10.
Further, the second accident ash-unloading tube 25, second accident ash-unloading tube 25 can be set on the cone bucket of 18 times, cinder storehouse and be provided with the 3rd hand operated gate valve 26.When cinder storehouse 18 is overhauled, cinder 18 times through cinder storehouse cone bucket accident cinder-discharging ports, the second accident ash-unloading tube 25 and the 3rd hand operated gate valves 26 are discharged.
Further, manhole can be set on wet cooling tower 1, easy access.
Further, storehouse pump 10 material is 16MnR or Q235B or spheroidal graphite iron or corrosion-resistant steel.Storehouse pump 10 capacity: 1.0 ~ 10m
3; Storehouse pump 10 quantity>=1, can multiplely combinationally use.Pneumatic carrier 17 adopts containing manganese solid drawn pipe, and elbow, threeway wear-resistant ceramic of lining material, pipe bending radius >=10 times pipe diameter, pipeline has choke preventing function.
Converter in converter of the present invention dry fume dedusting cinder pneumatic conveying method is defined as: decarburization converter or dephosphorization converter or lava homogenizing furnace or stainless steel.Method in the present embodiment is applicable to the conveying of 80t ~ 300t converter dry fume dedusting cinder.Its fed distance is about 300m, and climb altitude is about 30m.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (4)
1. converter dry fume dedusting cinder pneumatic conveying method, is characterized in that, comprise the following steps:
S1, structure converter dry fume dedusting cinder air-transport system, it comprise connect successively wet cooling tower (1), ash-unloading tube (4), storehouse pump (10), pneumatic carrier (17) and cinder storehouse (18); Level-sensing device (3) and rapping apparatus (2) is provided with in wet cooling tower (1); Described ash-unloading tube (4) is provided with pneumatic gate valve (5) and the first Pneumatic double gate valve (6); Pump (10) top, described storehouse is provided with the first vacuum pressure Dump valve (12); Described pneumatic carrier (17) is connected with storage tank (14), the entrance of described storage tank (14) is connected with the first nitrogen tube (13), and the entrance of described first nitrogen tube (13) is connected with nitrogen header pipe; Described storehouse pump (10) is connected by pneumatic carrier (17) with cinder storehouse (18), described pneumatic carrier (17) is provided with the second Pneumatic double gate valve (16), and bottom, described storehouse pump (10) is provided with first class device; The nitrogen tube that described storage tank (14) exports is divided into two-way, one tunnel is connected with described first class device, another road is connected with described pneumatic carrier (17), is provided with pneumatic ball valve (15) between described storage tank (14) and storehouse pump (10); Bag dust collector (19) and the second vacuum pressure Dump valve (20) are established in described cinder storehouse (18) top, second gasifying device (30) is provided with in cone bucket under described cinder storehouse (18), the cinder-discharging port of the lower cone bucket of described cinder storehouse (18) bottom is connected with the second hand operated gate valve (21) entrance, and described second hand operated gate valve (21) outlet is connected with dust humidifying agitator (22) entrance; The outlet of described dust humidifying agitator (22) is connected by ash releasing tube (23) with canvas hose (24) entrance; Described nitrogen header pipe is also connected with the second nitrogen tube (27) entrance, described second nitrogen tube (27) outlet is divided into two-way, one tunnel is connected with second gasifying device (30), and another Lu Yucang pushes up bag dust collector (19) and connects; Pressure regulating valve (28) and electromagnetic valve (29) is established between second nitrogen tube (27) and second gasifying device (30);
S2, charging: level-sensing device (3) is bored when the cinder in struggling against reaches upper limit under wet cooling tower (1) being detected and sent signal, start to unload ash to storehouse pump (10), pneumatic gate valve (5) and the first Pneumatic double gate valve (6) are in opening, pneumatic ball valve (15) and the second Pneumatic double gate valve (16) are closed, rapping apparatus (2) works, cinder enters storehouse pump (10) under gravity, after the level-sensing device carried when storehouse pump (10) detects that material is full, send signal and by PLC programming control, automatic closedown first Pneumatic double gate valve (6), fill process terminates,
S3, fluidisation: pneumatic ball valve (15) is opened, nitrogen enters the first class device in storehouse pump (10) from storage tank (14), the abundant fluidisation of cinder in storehouse pump (10), pressure constantly raises, when pressure rises to setting operation pressure, by PLC programming control, automatically open second Pneumatic double gate valve (16) of storehouse pump (10) sidepiece discharge outlet, fluid mapper process terminates;
S4, conveying: after the second Pneumatic double gate valve (16) is opened, fluidisation uniform gas ash compound delivers to cinder storehouse (18), the pressure remained steady now in storehouse pump (10) by pneumatic carrier (17); After the gas ash compound in storehouse pump (10) has been carried, the resistance of pneumatic carrier (17) declines, the pressure of pneumatic carrier (17) starts to reduce, when being reduced to the threshold pression of setting, then course of conveying terminates, enter purge, now pneumatic ball valve (15) and the second Pneumatic double gate valve (16) still remain on opening;
S5, purging: nitrogen continues purge bin pump (10) and pneumatic carrier (17), now storehouse pump (10) is interior without flying dust, gas ash compound in pneumatic carrier (17) reduces gradually, last is all almost nitrogen, systemic resistance continues to decline also after a period of stabilisation, purge terminates, close pneumatic ball valve (15) and the second Pneumatic double gate valve (16), then open the first Pneumatic double gate valve (6), storehouse pump (10) recovers feed state;
S6, migration: open electromagnetic valve (29), nitrogen passes in second gasifying device (30), fluidisation cinder, open the second hand operated gate valve (21), cinder in cinder storehouse (18), after dust humidifying agitator (22) humidification, is joined in bulk cement truck by ash releasing tube (23) and canvas hose (24).
2. converter according to claim 1 dry fume dedusting cinder pneumatic conveying method, it is characterized in that, in described step S2, the cinder detected under wet cooling tower (1) in cone bucket when the level-sensing device (3) in wet cooling tower (1) unloads and sends signal to during lower limit, stops unloading ash to storehouse pump (10).
3. converter according to claim 1 dry fume dedusting cinder pneumatic conveying method, is characterized in that, described converter is decarburization converter or dephosphorization converter or lava homogenizing furnace or stainless steel.
4. converter according to claim 1 dry fume dedusting cinder pneumatic conveying method, is characterized in that, the nitrogen pressure >=0.6MPa carried in described step S3-S6.
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| CN104404199A (en) * | 2014-10-20 | 2015-03-11 | 无锡泓成环境科技有限公司 | Converter one-time dry method dedusting evaporating cooling tower crude ash pneumatic conveying method under full-working condition |
| CN107520035B (en) * | 2017-09-27 | 2024-01-23 | 中国电建集团西北勘测设计研究院有限公司 | Sand processing and dust removing device and method |
| CN112029951B (en) * | 2020-08-12 | 2021-11-09 | 北京首钢自动化信息技术有限公司 | Coarse ash conveying control method and device |
| CN112760445B (en) * | 2020-12-24 | 2022-03-29 | 江西理工大学 | Pneumatic conveying system for dry dedusting fine ash of converter gas |
| CN114737014A (en) * | 2022-03-21 | 2022-07-12 | 福建龙净环保股份有限公司 | Converter fly ash conveying equipment and method |
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