CN103977699A - Pneumatic emulsion zinc oxide desulfurization system and technological process thereof - Google Patents
Pneumatic emulsion zinc oxide desulfurization system and technological process thereof Download PDFInfo
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- CN103977699A CN103977699A CN201410244387.5A CN201410244387A CN103977699A CN 103977699 A CN103977699 A CN 103977699A CN 201410244387 A CN201410244387 A CN 201410244387A CN 103977699 A CN103977699 A CN 103977699A
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Abstract
The invention discloses a pneumatic emulsion zinc oxide desulfurization system and a technological process thereof. The pneumatic emulsion zinc oxide desulfurization system comprises a desulfurization tower assembly, a pulping pool, a circulating pool assembly and a filtration and separation device, wherein the desulfurization tower assembly comprises a multi-stages of tower bodies; a smoke outlet is formed in the top of each tower body; a liquid outlet is formed in the bottom of each tower body; the middle area of each tower body sequentially comprises a gas homogenizing chamber, a turbulent flow aeration area and a defogging chamber from bottom to top; at least two layers of turbulent flow generators are arranged in the turbulent flow aeration area at intervals and used for accelerating the rotation of smoke; the liquid inlet of each tower body is formed in one side surface of the turbulent flow aeration area and located above the corresponding turbulent flow generator. Compared with a conventional desulfurization tower with slurry nozzles, the system is free of nozzles, so that the smoke smoothly runs; the circulating pool assembly is capable of using the slurry circularly, and thus the cost is reduced; the filtration and separation device is used for recycling by-products, and thus the secondary pollution is avoided. In addition, the technological process is easy to operate and high in dust removal and desulfurization efficiency.
Description
Technical field
The present invention relates to environmental protection equipment technical field, particularly relate to a kind of Pneumatic emulsifying desulfurizing zinc oxide system and technological process thereof.
Background technology
In the various gaseous contaminants that air quality is impacted, SO
2the quantity maximum of flue gas, affects the widest.The SO of industrial processes discharge
2flue gas, some concentration is higher and contain a large amount of dust, and the flue gas producing as nonferrous smelting contains higher SO
2concentration and containing the dust of other materials.
Current extensive use flue gas wet desulphurization process, its desulfurizing tower band slurry nozzle, this nozzle easily stops up and affects the operation of desulphurization system, and dedusting and desulfuration efficiency are low.In existing sulfur removal technology, zinc oxide belongs to the metal zinc oxide that has certain solubility, and in industry, conventional calcining rear oxidation zinc material is mixed with zinc oxide slurrying liquid, has avoided conventionally needing the cost consumption of outsourcing desulfurizing agent.Existing wet desulfurization system complexity, operating procedure are loaded down with trivial details, and dedusting and desulfuration efficiency are on the low side, and in addition, operating cost is high, and byproduct for treatment is dealt with improperly, even cause for the second time and pollute.
Summary of the invention
The invention provides a kind of Pneumatic emulsifying desulfurizing zinc oxide system and technological process thereof, in order to overcoming wet desulfurization system complexity in prior art, operating procedure is loaded down with trivial details, dedusting and desulfuration efficiency are on the low side and easily cause the technological deficiency of secondary pollution.
Based on the problems referred to above, the invention provides a kind of Pneumatic emulsifying desulfurizing zinc oxide system, comprise desulfurizing tower assembly, slurrying pond, circulatory pool assembly and filtering separation device, wherein: described desulfurizing tower assembly comprises multistage tower body, described in each, tower body top is provided with exhanst gas outlet, bottom is provided with liquid outlet, the zone line of described tower body comprises from bottom to top successively: all air chambers, He Chu fog chamber, turbulent flow aeration zone, the internal interval of described turbulent aeration zone is provided with at least two-layer turbulator for flue gas Spin-up, the inlet of described tower main body is positioned at the side of described turbulent aeration zone and is positioned at the top of described turbulator, described in previous stage, the exhanst gas outlet of tower body is communicated with the gas approach of tower body described in rear one-level, described circulatory pool assembly is provided with the circulatory pool consistent with described tower body quantity, described in each, the inlet of circulatory pool is all communicated with described slurrying pond, one liquid outlet of described circulatory pool is communicated with the inlet of described tower body, and another liquid outlet is communicated with the inlet of described filtering separation device.
Preferably, native system also comprises fresh water source, and described fresh water source is all communicated with described slurrying pond and described top of removing fog chamber.
Preferably, the bottom of described circulatory pool connects the oxidation fan for air is provided by pipeline, between described circulatory pool and described slurrying pond, be connected pulping pump, between described circulatory pool and described tower body, be connected circulating pump, between described circulatory pool and described filtering separation device, be connected slurry pump.
Preferably, in described slurrying pond, be provided with slurrying pond mixer, in described circulatory pool, be provided with circulatory pool mixer.
Preferably, described filtering separation device comprises plate and frame filter press, is arranged at the belt conveyer of described plate and frame filter press below, the filtrate storage tank being communicated with the liquid outlet of described plate and frame filter press, and described filtrate storage tank is delivered to cleaning procedure by filtrate pump by filtrate.
Preferably, between the inlet of described plate and frame filter press and described circulatory pool, be provided with for filtering front liquid bath, before described filtration, between liquid bath and the inlet of described plate and frame filter press, be also provided with filter pressing pump.
Preferably, described desulfurizing tower assembly comprises two-stage tower body, and the exhanst gas outlet of first order tower body is communicated with the smoke inlet of second level tower body, and the smoke outlet of described second level tower body is provided with the chimney for discharging desulfurization fume; Described circulatory pool assembly comprises two separate circulatory pools.
Also provide a kind of Pneumatic emulsifying Zinc oxide desulfuration technology flow process for realizing the object of the invention, comprise the steps:
Step S100, blanking, the slurries that the desulfurization processed of slurrying pond is used;
Multiple circulatory pools are sent slurries into respectively in step S200, described slurrying pond, and described in each, circulatory pool pumps into slurries in tower body from the side of corresponding turbulent aeration zone;
Step S300, untreated flue gas enter in described desulfurizing tower assembly by the equal air chamber of first order tower body, carry out emulsification desulphurization reaction in turbulent aeration zone and described slurries;
Flue gas after step S400, desulfurization upwards, through except fog chamber's processed, is sent in next stage tower body through exhanst gas outlet, and reacted slurries enter circulatory pool through liquid outlet downwards, recycle;
Step S500, flue gas are discharged described desulfurizing tower assembly after multistage tower body one-level primary dust removing, desulfurization;
In step S600, described circulatory pool, enter filtering separation device containing solid saturated slurries, described slurrying pond is to fluid infusion in described circulatory pool, and the plasm PH value meeting in described circulatory pool is 5～7.
Preferably, described slurries are prepared from by zinc oxide, described zinc oxide slurries and SO
2in described step S300, there is Pneumatic emulsifying desulphurization reaction, generate ZnSO
3.5/2H
2o or Zn (HSO
3)
2two kinds of unstable compounds.
Preferably, described ZnSO
3.5/2H
2o is oxidized in the circulatory pool of described step S400, sends into after described filtering separation device is processed and produces electrolytic zinc; Or, described ZnSO
3.5/2H
2o is decomposed by roaster through described filtering separation device isolated by filtration, after dry, and regeneration zinc oxide recycles; Or, described ZnSO
3.5/2H
2o, through acidolysis, discharges the SO of high concentration
2for the preparation of sulfuric acid.
Beneficial effect of the present invention comprises: a kind of Pneumatic emulsifying desulfurizing zinc oxide system provided by the invention, simple in structure, comprise desulfurizing tower assembly, slurrying pond, circulatory pool assembly and filtering separation device, in the time that pending flue gas contains more dust and sulfur dioxide, desulfurizing tower assembly can arrange multi-stage column main body for dedusting and desulfurization to meet fume emission requirement.The turbulent aeration zone of its tower main body is the core space of flue gas and slurry reaction, and flue gas is forced Spin-up during through two-layer turbulator at least, and with slurries generation emulsification desulphurization reaction, dust-removal and desulfurizing efficiency improves greatly.Compared with the desulfurizing tower of tradition with slurry nozzle, native system does not arrange nozzle, makes desulphurization system operation unobstructed.The circulatory pool assembly of system of the present invention can recycle slurries, reduces costs, and its filtering separation device reclaims byproduct, avoids causing secondary pollution.
A kind of Pneumatic emulsifying Zinc oxide desulfuration technology flow process provided by the invention, it is easy and simple to handle, and dust-removal and desulfurizing efficiency is high, and byproduct recoverable avoids causing secondary pollution.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of Pneumatic emulsifying desulfurizing zinc oxide system of the present invention;
Fig. 2 is the filtering separation device schematic diagram relating in Fig. 1;
Fig. 3 is a kind of Pneumatic emulsifying Zinc oxide desulfuration technology flow chart of the present invention.
Detailed description of the invention
Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing and by detailed description of the invention:
Referring to Fig. 1, the invention provides a kind of Pneumatic emulsifying desulfurizing zinc oxide system, comprise desulfurizing tower assembly 1, slurrying pond 2, circulatory pool assembly 3 and filtering separation device 6, wherein: desulfurizing tower assembly 1 comprises multistage tower body 10, each tower body 10 top is provided with exhanst gas outlet 11, bottom is provided with liquid outlet 12, the zone line of tower body 10 comprises from bottom to top successively: all air chambers 13, 14He Chu fog chamber, turbulent flow aeration zone 15, the internal interval of this turbulent aeration zone 14 is provided with at least two-layer turbulator 140 for flue gas Spin-up, the inlet of tower main body 1 is positioned at the side of turbulent aeration zone 14 and is positioned at the top of turbulator 140, the exhanst gas outlet 11 of previous stage tower body 10 is communicated with the gas approach of rear one-level tower body 10, circulatory pool assembly 3 is provided with the circulatory pool 4 consistent with tower body 10 quantity, and the inlet of each circulatory pool 4 is all communicated with slurrying pond 2, and a liquid outlet of circulatory pool 4 is communicated with the inlet of tower body 10, and another liquid outlet is communicated with the inlet of filtering separation device 6.
It should be noted that, in the time that pending flue gas contains more dust and sulfur dioxide, desulfurizing tower assembly 1 can arrange multi-stage column main body 1 for dedusting and desulfurization to meet fume emission requirement.The turbulent aeration zone 14 of native system is the core space of flue gas and slurry reaction, the inlet of turbulator 140 tops sprays downwards, meanwhile, flue gas is forced Spin-up during through at least two-layer turbulator 140, form the turbulent condition of similar cyclone, the liquid spraying is downwards subject to the effect of the upwards rotary-cut flue gas stream of carrying in a large number kinetic energy, by high speed shear, form the fine particle water droplet disperseing, and air-flow is by under the shearing of the reaction force of liquid, also be dispersed into tiny bubble, gas phase and liquid phase continue collision rotary-cut, thereby produce the emulsification desulfurization state that gas-liquid is wrapped up mutually, this process can be strengthened the contact area of gas phase and liquid phase, the speed of time of contact and Surface Renewal, thereby greatly improve the reaction rate of gas-liquid, make the mass-transfer efficiency of gas-liquid two-phase improve 10%-20%, greatly improve the desulfuration efficiency of system.
Compared with the desulfurizing tower of tradition with slurry nozzle, native system does not arrange nozzle, makes flue gas operation unobstructed, and the structure of the turbulator 140 of turbulent aeration zone 14 makes gas-liquid generation emulsification desulphurization reaction, and dust-removal and desulfurizing efficiency improves greatly.System of the present invention also comprises circulatory pool 4 and filtering separation device 6, and system architecture is simple, not only can recycle slurries, reduces costs, and also recyclable byproduct, avoids causing secondary pollution.
System of the present invention also comprises fresh water source 5, and fresh water source 5 and slurrying pond 2 and the top except fog chamber 15 are all communicated with.Can be 2 fluid infusion of slurrying pond, the also flushable internal structure except fog chamber 15, keeps flue gas operation unobstructed thereby prevent from blocking.
Preferably, the bottom of circulatory pool 4 connects the oxidation fan 43 for air is provided by pipeline, between circulatory pool 4 and slurrying pond 2, be connected pulping pump 22, between circulatory pool 4 and tower body 10, be connected circulating pump 42, between circulatory pool 4 and filtering separation device 6, be connected slurry pump 43.
In slurrying pond 2, be provided with slurrying pond mixer 21, in circulatory pool 4, be provided with circulatory pool mixer 41, improve reaction rate.
In conjunction with Fig. 2, particularly, the filtrate storage tank 64 that the filtering separation device 6 of embodiments of the invention comprises plate and frame filter press 62, is arranged at the belt conveyer 63 of plate and frame filter press 62 belows, is communicated with the liquid outlet of plate and frame filter press 62, filtrate storage tank 64 is delivered to cleaning procedure by filtrate pump 65 by filtrate.
Preferably, carry slurries for remote, and make it abundant withdrawal, between the inlet of plate and frame filter press 62 and circulatory pool 4, be provided with and filter front liquid bath 61, before filtering, between liquid bath 61 and the inlet of plate and frame filter press 62, be also provided with filter pressing pump.
In specific embodiments of the invention, desulfurizing tower assembly 1 is two-step desulfurization structure, and the exhanst gas outlet 11 of first order tower body 10 is communicated with the smoke inlet of second level tower body 10, and the smoke outlet of second level tower body 10 is provided with the chimney for discharging desulfurization fume; Circulatory pool assembly 3 comprises two separate circulatory pools 4.This system architecture is simple, and dust-removal and desulfurizing efficiency is high, not only can recycle slurries, reduces costs, and also recyclable byproduct, avoids causing secondary pollution.
Based on same inventive concept, the embodiment of the present invention also provides a kind of Pneumatic emulsifying Zinc oxide desulfuration technology flow process, because the principle that the method is dealt with problems is similar to the various functions of aforementioned a kind of Pneumatic emulsifying desulfurizing zinc oxide system, therefore, the enforcement of the method can realize by aforementioned system concrete function, repeats part and repeats no more.
Accordingly, referring to Fig. 3, a kind of Pneumatic emulsifying Zinc oxide desulfuration technology flow process that the present invention also provides, comprises the steps:
Step S100, blanking, the slurries that slurrying pond 2 desulfurization processed is used;
Multiple circulatory pools 4 are sent slurries into respectively in step S200, slurrying pond 2, and each circulatory pool 4 pumps into slurries in tower body 10 from the side of corresponding turbulent aeration zone 14;
Step S300, untreated flue gas enter in desulfurizing tower assembly 1 by the equal air chamber 13 of first order tower body 10, carry out emulsification desulphurization reaction in turbulent aeration zone 14 with slurries;
Flue gas after step S400, desulfurization upwards, through except fog chamber's 15 processed, is sent in next stage tower body 10 through exhanst gas outlet 11, and reacted slurries enter circulatory pool 2 through liquid outlet 12 downwards, recycle;
Step S500, flue gas are discharged desulfurizing tower assembly 1 after multistage tower body 10 one-level primary dust removings, desulfurization;
The solid saturated slurries that contain in step S600, circulatory pool 4 enter filtering separation device 6, and slurrying pond 2 is to the interior fluid infusion of circulatory pool 4, and the plasm PH value meeting in circulatory pool 4 is 5～7.
In embodiments of the invention, using secondary zinc oxide slip as slurries, absorb the sulfur dioxide in flue gas, be especially applicable to the flue gas desulfurization of zinc smeltery.The flue dust preparation that secondary zinc oxide slurries can be collected with the outlet dust-precipitator of Fluidized Bed Roast of Zinc Concentrates stove, reduces costs.Particularly, zinc oxide slurries and SO
2in step S300, there is Pneumatic emulsifying desulphurization reaction, generate ZnSO
3.5/2H
2o or Zn (HSO
3)
2two kinds of unstable compounds.
Above-mentioned two kinds of compounds have three kinds of different recovery and treatment methods: one, ZnSO
3.5/2H
2o is interior oxidized at the circulatory pool 2 of step S400, sends into after filtering separation device 6 is processed and produces electrolytic zinc; Two, ZnSO
3.5/2H
2o is decomposed by roaster through filtering separation device 6 isolated by filtration, after dry, and regeneration zinc oxide recycles; Three, ZnSO
3.5/2H
2o, through acidolysis, discharges the SO of high concentration
2for the preparation of sulfuric acid.
Certainly, in other embodiments, the desulfurizing agent raw material that is applied to system of the present invention is not limited in zinc oxide, can be varied, as various basic species and industrial wastes such as lime stone, lime, calcium carbide mud, flyash, manganese oxide, magnesia, energy-conserving and environment-protective, are widely used.
A kind of Pneumatic emulsifying desulfurizing zinc oxide system of the present invention, simple in structure, comprise desulfurizing tower assembly 1, slurrying pond 2, circulatory pool assembly 3 and filtering separation device 6, in the time that pending flue gas contains more dust and sulfur dioxide, desulfurizing tower assembly 1 can arrange multi-stage column main body 1 for dedusting and desulfurization to meet fume emission requirement.The turbulent aeration zone 14 of its tower main body 1 is the core space of flue gas and slurry reaction, and flue gas is forced Spin-up during through at least two-layer turbulator 140, and with slurries generation emulsification desulphurization reaction, dust-removal and desulfurizing efficiency improves greatly.Compared with the desulfurizing tower of tradition with slurry nozzle, native system does not arrange nozzle, makes sweetening process operation unobstructed.The circulatory pool assembly 3 of system of the present invention can recycle slurries, reduces costs, and its filtering separation device 6 reclaims byproduct, avoids causing secondary pollution.
A kind of Pneumatic emulsifying Zinc oxide desulfuration technology flow process provided by the invention, has easy and simple to handlely, and dust-removal and desulfurizing efficiency is high, and byproduct recoverable avoids causing the function of secondary pollution.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a Pneumatic emulsifying desulfurizing zinc oxide system, is characterized in that: comprise desulfurizing tower assembly (1), slurrying pond (2), circulatory pool assembly (3) and filtering separation device (6), wherein:
Described desulfurizing tower assembly (1) comprises multistage tower body (10), tower body described in each (10) top is provided with exhanst gas outlet (11), bottom is provided with liquid outlet (12), the zone line of described tower body (10) comprises from bottom to top successively: all air chambers (13), turbulent flow aeration zone (14) and except fog chamber (15), the internal interval of described turbulent aeration zone (14) is provided with at least two-layer turbulator for flue gas Spin-up (140), the inlet of described tower main body (1) is positioned at the side of described turbulent aeration zone (14) and is positioned at the top of described turbulator (140), the exhanst gas outlet (11) of tower body described in previous stage (10) is communicated with the gas approach of tower body (10) described in rear one-level,
Described circulatory pool assembly (3) is provided with the circulatory pool (4) consistent with described tower body (10) quantity, the inlet of circulatory pool described in each (4) is all communicated with described slurrying pond (2), one liquid outlet of described circulatory pool (4) is communicated with the inlet of described tower body (10), and another liquid outlet is communicated with the inlet of described filtering separation device (6).
2. a kind of Pneumatic emulsifying desulfurizing zinc oxide system according to claim 1, it is characterized in that, also comprise fresh water source (5), described fresh water source (5) is all communicated with described slurrying pond (2) and described top of removing fog chamber (15).
3. a kind of Pneumatic emulsifying desulfurizing zinc oxide system according to claim 1, it is characterized in that, the bottom of described circulatory pool (4) connects the oxidation fan (43) for air is provided by pipeline, between described circulatory pool (4) and described slurrying pond (2), be connected pulping pump (22), between described circulatory pool (4) and described tower body (10), be connected circulating pump (42), between described circulatory pool (4) and described filtering separation device (6), be connected slurry pump (43).
4. a kind of Pneumatic emulsifying desulfurizing zinc oxide system according to claim 3, it is characterized in that, in described slurrying pond (2), be provided with slurrying pond mixer (21), in described circulatory pool (4), be provided with circulatory pool mixer (41).
5. a kind of Pneumatic emulsifying desulfurizing zinc oxide system according to claim 1, it is characterized in that, described filtering separation device (6) comprises plate and frame filter press (62), is arranged at the belt conveyer (63) of described plate and frame filter press (62) below, the filtrate storage tank (64) being communicated with the liquid outlet of described plate and frame filter press (62), and described filtrate storage tank (64) is delivered to cleaning procedure by filtrate pump (65) by filtrate.
6. a kind of Pneumatic emulsifying desulfurizing zinc oxide system according to claim 5, it is characterized in that, between the inlet of described plate and frame filter press (62) and described circulatory pool (4), be provided with and filter front liquid bath (61), before described filtration, between liquid bath (61) and the inlet of described plate and frame filter press (62), be also provided with filter pressing pump.
7. a kind of Pneumatic emulsifying desulfurizing zinc oxide system according to claim 1, it is characterized in that, described desulfurizing tower assembly (1) comprises two-stage tower body (10), the exhanst gas outlet (11) of first order tower body (10) is communicated with the smoke inlet of second level tower body (10), and the smoke outlet of described second level tower body (10) is provided with the chimney for discharging desulfurization fume; Described circulatory pool assembly (3) comprises two separate circulatory pools (4).
8. a Pneumatic emulsifying Zinc oxide desulfuration technology flow process, is characterized in that, comprises the steps:
Step S100, blanking, the slurries that slurrying pond (2) desulfurization processed is used;
Multiple circulatory pools (4) are sent slurries into respectively in step S200, described slurrying pond (2), and circulatory pool described in each (4) pumps into slurries in tower body (10) from the side of corresponding turbulent aeration zone (14);
Step S300, untreated flue gas enter in described desulfurizing tower assembly (1) by the equal air chamber (13) of first order tower body (10), carry out emulsification desulphurization reaction in turbulent aeration zone (14) with described slurries;
Flue gas after step S400, desulfurization is upwards through removing fog chamber (15) processed, send in next stage tower body (10) through exhanst gas outlet (11), reacted slurries pass through liquid outlet (12) downwards and enter circulatory pool (2), recycle;
Step S500, flue gas are discharged described desulfurizing tower assembly (1) after multistage tower body (10) one-level primary dust removing, desulfurization;
The solid saturated slurries that contain in step S600, described circulatory pool (4) enter filtering separation device (6), described slurrying pond (2) is to the interior fluid infusion of described circulatory pool (4), and the plasm PH value meeting in described circulatory pool (4) is 5～7.
9. a kind of Pneumatic emulsifying Zinc oxide desulfuration technology flow process according to claim 8, is characterized in that: described slurries are prepared from by zinc oxide described zinc oxide slurries and SO
2in described step S300, there is Pneumatic emulsifying desulphurization reaction, generate ZnSO
3.5/2H
2o or Zn (HSO
3)
2two kinds of unstable compounds.
10. a kind of Pneumatic emulsifying Zinc oxide desulfuration technology flow process according to claim 9, is characterized in that: described ZnSO
3.5/2H
2o is oxidized in the circulatory pool (2) of described step S400, sends into after described filtering separation device (6) is processed and produces electrolytic zinc;
Or, described ZnSO
3.5/2H
2o is decomposed by roaster through described filtering separation device (6) isolated by filtration, after dry, and regeneration zinc oxide recycles;
Or, described ZnSO
3.5/2H
2o, through acidolysis, discharges the SO of high concentration
2for the preparation of sulfuric acid.
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|---|---|---|---|
| CN201410244387.5A CN103977699A (en) | 2014-06-04 | 2014-06-04 | Pneumatic emulsion zinc oxide desulfurization system and technological process thereof |
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|---|---|---|---|
| CN201410244387.5A CN103977699A (en) | 2014-06-04 | 2014-06-04 | Pneumatic emulsion zinc oxide desulfurization system and technological process thereof |
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ID=51270010
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110813046A (en) * | 2019-11-29 | 2020-02-21 | 杨昆 | Double-circulation desulfurization device and desulfurization process |
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| CA2157565A1 (en) * | 1995-09-05 | 1997-03-06 | Esa Pikkujamsa | Method for removing sulphur oxides from flue gases of a boiler plant |
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| CN110813046A (en) * | 2019-11-29 | 2020-02-21 | 杨昆 | Double-circulation desulfurization device and desulfurization process |
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Address after: Our entrepreneurial base 627 No. 410000 Hunan high tech Development Zone, Changsha Lugu Avenue 3 floor Applicant after: Changsha high BHP desulfurization project Co., Ltd Address before: 410000 Hunan province Changsha Road East impression building A Building No. 3106 Applicant before: Changsha high BHP desulfurization project Co., Ltd |
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Application publication date: 20140813 |