CN101690867A - Tangential-flow and direct-flow composite air intake desulfurizing tower of half dry type circulating fluidized bed (CFB) - Google Patents
Tangential-flow and direct-flow composite air intake desulfurizing tower of half dry type circulating fluidized bed (CFB) Download PDFInfo
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Abstract
The invention relates to a tangential-flow and direct-flow composite air intake desulfurizing tower of a half dry type circulating fluidized bed (CFB), which comprises a fume branch intake pipe (1), a fume intake pipe (2), a square round transition pipe (3), a tangential air intake structure (4), an inner cylinder body (11), a desulfurizer inlet pipe (5), a desulfurizing tower body (6), a fume outlet pipe (7), an air-solid separator (8), a return material inlet pipe (9) and an airflow distribution chamber (10); because of the arrangement of the tangential air intake structure of the device, fume contacts with a desulfurizer fully by the intense turbulent mixing between air and solid, the process of a desulfuration reaction is strengthened, and the function of the desulfurizer is fully exerted. Ascending direct flow from the airflow distribution chamber ascends together with concentrated particles at the surface of an external device wall. The structure lowers the height of the desulfurizing tower greatly and enhances the separation efficiency.
Description
Technical field
The present invention relates to fume desulfurizing tower, particularly the circulating fluid bed semi-drying method flue gas desulfurization technology.The present invention is that a kind of cutting by setting flowed and direct current composite air intake structure, strengthens the turbulence intensity of air-flow in the circulating fluidized bed desulfurization tower, and desulfurizing agent is fully contacted with flue gas, is a kind of method that improves desulfuration efficiency.
Background technology
Semidry-method recirculating fluidized bed desulfur technology by the repeatedly circulation of desulfurizing agent, prolongs the time of contact of desulfurizing agent and flue gas based on recirculating fluidized bed, improves the utilization rate and the desulfuration efficiency of desulfurizing agent.The main equipment of this technology is a desulfurizing tower, and the sweetening process of flue gas is carried out in desulfurizing tower.Usually sulfur-containing smoke gas enters from the bottom of desulfurizing tower, and is evenly up in tower, and the bottom of desulfurizing tower sprays into desulfurizing agent and an amount of atomized water in tower.Desulfurizing agent and an amount of atomized water in up process with flue gas in sulfide react, deviate from the sulphur in the flue gas.Therefore this course of reaction is a uniform concentration course of reaction, and flue gas and desulfurizing agent plant at the uniform concentration branch and carry out.Flue gas after the desulfurization flows out from cat head, divides separable flue gas and solid particulate matter wherein by gas-solid separation equipment, purifies flue gas by smoke stack emission, and a solid particulate matter part that separates enters desulfurizing tower once more and recycles, and a part is discharged.
Because the sweetening process of flue gas is carried out in desulfurizing tower, so the Gas-solid Two-phase Flow feature in the desulfurizing tower is one of key factor that influences desulfurized effect.Present desulfurizing tower adopts air distribution plate or Venturi tube more on streaming mode, purpose is the uniform distribution air-flow, keeps the uniform concentration reaction characteristics of fluid bed.Desirable flow regime is that air upflow distributes even as far as possible, symmetrical on different tower sections, desulfurizing agent is evenly distributed in the air-flow, forms the fluidised form of uniform concentration, gives full play to the useful space in the desulfurizing tower, make full use of desulfurizing agent and finish sweetening process, improve smoke desulfurization efficiency.But this uniform concentration course of reaction has the following disadvantages:
1. this uniform upstream, the shearing force of air-flow is smaller, and turbulence intensity is not high, and it is not fierce that flue gas contacts with desulfurizing agent, and undercompounding can not be strengthened the course of reaction of flue gas and desulfurizing agent.
2. the velocity ratio of air-flow is lower, has only axial velocity, and it is little to take dust quantity, and material concentration is low in the desulfurizing tower, and interior circulation is not strong, the operation that incompatible big rate of load condensate changes.
3. the product on sorbent particle surface remains, and has hindered the desulfurizing agent of outside flue gas and granule interior and has proceeded reaction, can not make full use of desulfurizing agent.
4. be subjected to the base support structure of desulfurizing tower and the restriction easily that flue is arranged, flue is entered by desulfurizing tower bottom one side level usually, by being advanced into desulfurizing tower on 90 ° of bend pipes, be subjected to the influence of gas inertia, it is uneven that the velocity of flue gas that enters desulfurizing tower is distributed, and has bigger backflow in the desulfurizing tower.Though can adjust a part of bias current by single Venturi tube or a plurality of Venturi tube, be subjected to producing the restriction of very big pressure drop, this adjustment is limited, especially large diameter desulfurizing tower, the velocity of flue gas that is difficult to keep in the desulfurizing tower evenly distributes.
5. this flue level enters, and by being advanced into Venturi tube on 90 ° of bend pipes, enters desulfurizing tower again, has increased the whole height of desulfurizing tower.
6. the import of desulfurizing agent is located on the sidewall of desulfurizing tower bottom usually, can cause after desulfurizing agent enters like this at the inner skewness of desulfurizing tower, the desulfurizing agent concentration of inlet port one side is higher, the desulfurizing agent concentration of other positions is on the low side, the time of staying of desulfurizing agent in desulfurizing tower that causes spraying in the tower is inhomogeneous, there is very big difference, influences the utilization rate of desulfuration efficiency and desulfurizing agent.
Stack gas desulfurization and dust removal of circulating fluid bed integral method and device that Chinese invention patent CN 200410101852.6 proposes, in the desulfurizing tower bottom pre-separation chamber is set, the pre-separation chamber adopts two-way tangential admission structure to form rotating flow in the pre-separation chamber, but pre-separation chamber purpose is to realize the pre-separation of solid particle in the buffering of flue gas and the flue gas, separate the back flue gas and enter desulfurizing tower through changeover portion again, changeover portion form class is like the venturi tube bank, effect is still the distribution air-flow, and the air velocity distribution in the desulfurizing tower is evenly up.A kind of dry-type circulating fluidized bed desulfurization reaction tower that Chinese invention patent CN 200410101853.0 proposes, in the desulfurizing tower bottom pre-separation chamber is set, pre-separation chamber tangential admission forms rotating flow, purpose is to realize the pre-separation of solid particle in the buffering of flue gas and the flue gas, separate the back flue gas and enter desulfurizing tower through the venturi section again, the air velocity distribution in the desulfurizing tower is evenly up.
Hao Xiaowen, and Ma Chunyuan etc. (document 1 Hao Xiao literary composition, Ma Chunyuan, Huang Shengzhu, Zhang Liqiang, circulating fluidized bed desulfurization tower is straight/the Two-Phase Flow Field experimental study down of eddy flow composite fluidization, the thermal power engineering, in September, 2005, the 20th rolls up the 5th phase: 497-505.2 Hao Xiao literary compositions, Ma Chunyuan, Zhang Liqiang, Dong Yong, the desulfurization of recirculating fluidized bed under inward turning/direct current composite fluidization, power engineering, in August, 2007, the 27th volume the 4th phase: 576-600.3 Hao Xiao literary compositions, Ma Chunyuan, Wang Chunbing, Zhang Liqiang, two-phase flow experimental study under the straight composite fluidization of circulation fluidized bed swirl, the thermal power engineering, in November, 2008, the 23rd the 6th phase of volume: 620-624) propose a kind of direct current and the recirculating fluidized bed of cutting the stream mixed admission, adopt the streaming mode of nonuniform air distribution, on venturi direct current fluidisation basis, propose direct current and the compound streaming mode of eddy flow, inner core is installed at Venturi throat, installation shaft forms outside eddy flow and the compound streaming mode of inner core direct current to rotating vane between inner core and the venturi.The air quantity of inner/outer tube distributes automatically.Width of blade, the blade exit elevation angle, the installation site is all influential to gas phase flow field.Blade is installed in throat's outlet or divergent segment inlet, and as shown in Figure 3, but this dependence blade produces the method for rotating flow, structurally makes and install relative complex.
Summary of the invention
The present invention adopts a kind of streaming mode air inlet of nonuniform air distribution, by direct current with cut the stream composite air intake and make in the desulfurizing tower direct current and rotation coexistence, uniform concentration course of reaction in the desulfurizing tower is improved to non-homogeneous concentration-response process, and purpose is the desulphurization reaction process in the reinforcing desulfuration tower.The present invention is by providing a kind of gas distribution chamber that is installed in the flue gas tangential admission structure in the desulfurizing tower and is installed in the desulfurizing tower bottom, in desulfurizing tower, form the flow field of a direct current and rotating flow coexistence, it is smaller to solve desulfurizing tower flow field shearing force, air stream turbulence intensity is not high, flue gas contacts insufficient with the desulfurizing agent mixing, the problem that sorbent utilization is not high, the while can be improved the operating flexibility of desulfurizing tower, reduces the desulfurizing tower height.
A kind of circulating fluid bed in damp dry type of the present invention is cut stream and direct current composite air intake desulfurizing tower, comprise flue gas branch air inlet pipe (1), smoke inlet pipe (2), circumference transition conduit (3), tangential admission structure (4), inner barrel (11), desulfurizing agent inlet tube (5), desulfurization tower body (6), smoke outlet tube (7), gas-solid separator (8), feed back inlet tube (9), gas distribution chamber (10); Smoke inlet pipe (2) is connected with tangential admission structure (4) by circumference transition conduit (3), tangential admission structure (4) is positioned at desulfurization tower body (6) bottom, tangent with inner barrel (11), inner barrel (11) forms an annular space (12) with desulfurization tower body (6), be connected to the gas distribution chamber (10) of desulfurization tower body (6) bottom from the flue gas branch air inlet pipe (1) that smoke inlet pipe (2) is drawn, gas distribution chamber (10) communicates with desulfurization tower body (6) by annular space (12), desulfurizing agent inlet tube (5) is positioned at desulfurization tower body (6) bottom centre position, feed back inlet tube (9) is positioned at the bottom of desulfurization tower body (6), and smoke outlet tube (7) is positioned at the top of desulfurization tower body (6).
A kind of circulating fluid bed in damp dry type of the present invention is cut stream and direct current composite air intake desulfurizing tower, it is characterized in that described tangential admission structure (4) is a rectangular tube, or pipe.
A kind of circulating fluid bed in damp dry type of the present invention is cut stream and direct current composite air intake desulfurizing tower, it is characterized in that described tangential admission structure (4) and inner barrel (11) vertical cut, or scroll casing type incision.
Below in conjunction with accompanying drawing, be described in detail technical scheme of the present invention.
Smaller for overcoming in the desulfurizing tower flue gas stream shearing force, air stream turbulence intensity is not high, and flue gas contacts insufficient with desulfurizing agent, and the problem that sorbent utilization is not high is provided with the tangential admission structure in the desulfurizing tower bottom, forms strong rotating flow in desulfurizing tower.Under the effect of rotating flow, the shearing force of air-flow and turbulence intensity improve, flue gas and desulfurizing agent fully contact and mixing is strengthened.Because the effect of rotating flow, collision and friction mutually comes off the product on sorbent particle surface between the sorbent particle, and the inner active high part of sorbent particle continues to participate in reaction, improves the utilization rate of desulfurizing agent.Particle is under action of centrifugal force simultaneously, and intergranular shearing centrifugation strengthens, and particle is difficult for poly-group, does not produce deposition, and particle is taken away by up flue gas easily.The inlet of desulfurizing agent is arranged on the centre of desulfurizing tower, because jet-action makes desulfurizing agent be evenly distributed in desulfurizing tower inside, has avoided desulfurizing agent in the past to enter the desulfurizing agent problem pockety of generation at sidewall.Though the effect of rotating flow makes sorbent particle move to wall, because particle grain size is smaller, the radial velocity of rotating flow is limited, and movement of particles is to the time of wall in the sufficient reaction time greater than desulfurizing agent.
Under action of centrifugal force, particle can be concentrated near the wall, sedimentation downwards under the gravity effect.But by be provided with axial DC upwards carry this part particle up or enter in form circulation in the eddy flow, increase the mass transfer and the response intensity of desulfurizing agent.Axial DC produces by in the desulfurizing tower bottom gas distribution chamber being set.The flue gas that the flue gas branched pipe draws from smoke inlet pipe enters gas distribution chamber, and the annular space that the air communication in the distributor chamber is crossed between tangential admission structure and the desulfurizing tower is up, forms axial up direct current.
Therefore the flow field of desulfurizing tower inside is that inside is rotating flow, and the outside is a direct current, both coexistences, and interaction is combined with each other.The intensity of rotating flow and the size of axial velocity are promptly cut stream and can be regulated by the ratio of distributing the each several part exhaust gas volumn with the size of direct current.
A kind of circulating fluid bed in damp dry type of the present invention is cut stream and direct current composite air intake desulfurizing tower, comprise flue gas branch air inlet pipe (1), smoke inlet pipe (2), circumference transition conduit (3), tangential admission structure (4), inner barrel (11), desulfurizing agent inlet tube (5), desulfurization tower body (6), smoke outlet tube (7), gas-solid separator (8), feed back inlet tube (9), gas distribution chamber (10); Smoke inlet pipe (2) is connected with tangential admission structure (4) by circumference transition conduit (3), if smoke inlet pipe (2) is a rectangular tube, then directly be connected with tangential admission structure (4), tangential admission structure (4) is positioned at desulfurization tower body (6) bottom, tangent with inner barrel (11), form an annular space (12) between desulfurization tower body (6) and the inner barrel (11), be connected to the gas distribution chamber (10) of desulfurizing tower bottom from the flue gas branch air inlet pipe (1) that smoke inlet pipe (2) is drawn, gas distribution chamber (10) communicates with desulfurization tower body (6) by annular space (12).Desulfurizing agent inlet (5) is positioned at the desulfurizing tower bottom centre position, and feed back inlet (9) is positioned at the desulfurizing tower bottom, and exhanst gas outlet (7) is positioned at the top of desulfurizing tower,
The tangential admission pipe is a rectangular tube, or pipe.Intake type is the air inlet of spiral case form, or the vertical cut air inlet.Compare the vane type air inlet and produce rotating flow, the processing and manufacturing of tangential admission structure is simple, arranges easily.
Owing to cancelled the Venturi tube gas distribution, the pressure drop of desulfurizing tower system reduces greatly, has certain energy-saving effect.In addition, owing to cancelled Venturi tube and 90 ° of bend pipes, adopted the tangential admission structure to reduce the whole height of desulfurizing tower.
A kind of circulating fluid bed in damp dry type of the present invention is cut stream and direct current composite air intake desulfurizing tower, its operation principle is, as shown in Figure 4, flue gas produces strong rotating flow by the tangential admission structure in desulfurizing tower, form the three-dimensional rotation velocity field, have bigger shearing force between the air-flow, the turbulence intensity of air-flow also improves, and keeps fully contacting and mixing between desulfurizing agent and the flue gas.Because the centrifugal action of rotating flow, sorbent particle concentrate rotation gradually to the wall motion on the wall surface, collision friction between the particle comes off the product of particle surface, inner fresh desulfurizing agent continues to contact the participation reaction with flue gas, has made full use of desulfurizing agent, improves desulfuration efficiency.The import of desulfurizing agent is located at the center of desulfurizing tower bottom, desulfurizing agent enter behind the desulfurizing tower to around evenly scattering, desulfurizing agent evenly distributes in desulfurizing tower, arrives wall through 5～7 (s) after above reaction time, and this time can be satisfied the time requirement that flue gas and desulfurizing agent react.Though the granule density of desulfurizing tower wall is than higher, owing to be provided with up axial flow, up axial velocity is bigger, and it is up to carry particle, thereby avoids the sedimentation of particle.
A kind of circulating fluid bed in damp dry type of the present invention is cut stream and direct current composite air intake desulfurizing tower, its theory is to adopt non-homogeneous concentration-response pattern, change the in the past uniform concentration reaction pattern of desulfurizing tower, by transforming the desulfurizing tower air inlet as the tangential admission structure, fluidized gas power and rotary centrifugal force are organically combined, have following beneficial effect:
1. flue gas forms strong rotating flow in desulfurizing tower, have bigger shearing force between the air-flow, the turbulence intensity of air-flow also improves greatly, has good gas-solid contact, mixing, turbulence effect, keep fully contacting between desulfurizing agent and the flue gas, strengthen the desulphurization reaction process of flue gas and desulfurizing agent.
2. because the flow field is rotation status, and the concentration ratio that contains desulfurizing agent is higher, the reserve of desulfurizing agent is also high in the desulfurizing tower, has increased the contact probability of flue gas and desulfurizing agent, has improved desulfuration efficiency.
3. the speed of swirling eddy is greater than unidirectional axial velocity, and the ability of carrying particle is more intense. The spin intensity of swirling eddy is subjected to the impact of entrance velocity smaller, when the exhaust gas volumn of processing changes, can guarantee certain spin intensity, so adapt to the operation that rate of load condensate changes.
4. owing to the centrifugal action of rotating flow, sorbent particle concentrates rotation on the wall surface, and the collision friction between the particle comes off the product of particle surface, inner fresh desulfurizing agent continues to contact participation with flue gas and reacts, take full advantage of desulfurizing agent, improve desulfuration efficiency, effect is remarkable.
5. owing to the centrifugal action of rotating flow, sorbent particle concentrates rotation on the wall surface, in stronger the washing away of wall surface formation, can prevent effectively that wall sticking phenomenon from taking place.
6. tangential admission desulfurizing tower, cancelled the venturi tube bank, the integration that does not need the venturi tube bank that air-flow is distributed, the pressure drop of the part of venturi tube bank in the past is the major part of whole circulation fluid bed pressure drop, therefore adopts the desulfurizing tower of tangential admission can eliminate this part very big pressure drop.Though the rotating flow that tangential admission produces has pressure drop, far below the pressure drop of venturi tube bank part, reduced the circulating resistance of flue gas generally, energy consumption is reasonable, has good energy-saving effect.
7. change up bend pipe owing to cancelled the level of Venturi tube and desulfurizing tower bottom, desulfurizing tower device height reduces, compact conformation, rationally, be convenient to installation and maintenance.
8. the inside, flow field of desulfurizing tower inside is rotating flow, and the outside is a direct current, both coexistences, and interaction is combined with each other.The intensity of rotating flow and the size of axial velocity are promptly cut stream and can be regulated by the ratio of distributing the each several part exhaust gas volumn with the size of direct current.
Description of drawings
Fig. 1 cuts stream and direct current composite air intake desulfurizing tower schematic diagram for a kind of circulating fluid bed in damp dry type, and import is a rectangular tube vertical cut desulfurizing tower.
Claims (3)
1. a kind of circulating fluid bed in damp dry type of the present invention is cut stream and direct current composite air intake desulfurizing tower, comprise flue gas branch air inlet pipe (1), smoke inlet pipe (2), circumference transition conduit (3), tangential admission structure (4), inner barrel (11), desulfurizing agent inlet tube (5), desulfurization tower body (6), smoke outlet tube (7), gas-solid separator (8), feed back inlet tube (9), gas distribution chamber (10); Smoke inlet pipe (2) is connected with tangential admission structure (4) by circumference transition conduit (3), tangential admission structure (4) is positioned at desulfurization tower body (6) bottom, tangent with inner barrel (11), inner barrel (11) forms an annular space (12) with desulfurization tower body (6), be connected to the gas distribution chamber (10) of desulfurization tower body (6) bottom from the flue gas branch air inlet pipe (1) that smoke inlet pipe (2) is drawn, gas distribution chamber (10) communicates with desulfurization tower body (6) by annular space (12), desulfurizing agent inlet tube (5) is positioned at desulfurization tower body (6) bottom centre position, feed back inlet tube (9) is positioned at the bottom of desulfurization tower body (6), and smoke outlet tube (7) is positioned at the top of desulfurization tower body (6).
2. recirculating fluidized bed according to claim 1 is cut stream and direct current composite air intake desulfurizing tower, it is characterized in that described tangential admission structure (4) is a rectangular tube, or pipe.
3. recirculating fluidized bed according to claim 1 is cut stream and direct current composite air intake desulfurizing tower, it is characterized in that described tangential admission structure (4) and inner barrel (11) vertical cut, or scroll casing type incision.
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| CN2009101432976A CN101690867B (en) | 2009-05-25 | 2009-05-25 | Tangential-flow and direct-flow composite air intake desulfurizing tower of half dry type circulating fluidized bed (CFB) |
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Cited By (8)
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| CN102266718A (en) * | 2010-06-07 | 2011-12-07 | 中国科学院过程工程研究所 | Semi dry process flue gas desulfurization method of circulating fluidized bed based on circulation, and apparatus thereof |
| CN103143254A (en) * | 2013-03-22 | 2013-06-12 | 福建龙净脱硫脱硝工程有限公司 | Compound airflow generator, circulating fluidized bed tower-front two-phase premixing device and method |
| CN103691584A (en) * | 2013-12-18 | 2014-04-02 | 中船重工环境工程有限公司 | Stable vortex flow field adjusting device |
| CN105126460A (en) * | 2015-08-20 | 2015-12-09 | 中国石油大学(北京) | Desulphurization dedusting integrated half-dry type swirl desulfurization tower |
| CN109589777A (en) * | 2018-12-17 | 2019-04-09 | 北京博奇电力科技有限公司 | A kind of Multi-stage spiral circulating fluid bed desulfurization device and its sulfur method |
| CN109806734A (en) * | 2019-01-28 | 2019-05-28 | 西安理工大学 | The dynamic regulation method of desulfurizing agent distributing homogeneity in open ocean fluidized bed at elevated |
| CN110756036A (en) * | 2019-11-29 | 2020-02-07 | 苏州仕净环保科技股份有限公司 | Thermal power plant flue gas wet desulphurization system with multi-parameter monitoring function |
| CN111545042A (en) * | 2020-05-12 | 2020-08-18 | 江苏峰峰鸿运环保科技发展有限公司 | Flue gas semi-dry desulfurization device and method |
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| US4409101A (en) * | 1981-11-16 | 1983-10-11 | Moskousky Institut Stali I Splavov | Fluidized bed apparatus |
| CN1201853C (en) * | 2003-04-11 | 2005-05-18 | 清华大学 | Dry type stack gas desulfurization method and its apparatus |
| CN2690035Y (en) * | 2004-04-08 | 2005-04-06 | 毛元夫 | Spray fluidized bed smoke desulfizing device |
| CN2796812Y (en) * | 2004-12-29 | 2006-07-19 | 清华大学 | Integrated device of semidry circulation fluidized bed for exhaust gas desulfuring and dust removal |
| CN100425329C (en) * | 2005-11-25 | 2008-10-15 | 山东大学 | Tech. for desulphuni zation of flue-gas by using integrated internal circulation and two-speed fluidized bed |
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| CN102266718A (en) * | 2010-06-07 | 2011-12-07 | 中国科学院过程工程研究所 | Semi dry process flue gas desulfurization method of circulating fluidized bed based on circulation, and apparatus thereof |
| CN102266718B (en) * | 2010-06-07 | 2014-07-30 | 中国科学院过程工程研究所 | Semi dry process flue gas desulfurization method of circulating fluidized bed based on circulation, and apparatus thereof |
| CN103143254A (en) * | 2013-03-22 | 2013-06-12 | 福建龙净脱硫脱硝工程有限公司 | Compound airflow generator, circulating fluidized bed tower-front two-phase premixing device and method |
| CN103691584A (en) * | 2013-12-18 | 2014-04-02 | 中船重工环境工程有限公司 | Stable vortex flow field adjusting device |
| CN103691584B (en) * | 2013-12-18 | 2015-09-30 | 中船重工环境工程有限公司 | A kind of steady eddy flow field adjusting device |
| CN105126460A (en) * | 2015-08-20 | 2015-12-09 | 中国石油大学(北京) | Desulphurization dedusting integrated half-dry type swirl desulfurization tower |
| CN109589777A (en) * | 2018-12-17 | 2019-04-09 | 北京博奇电力科技有限公司 | A kind of Multi-stage spiral circulating fluid bed desulfurization device and its sulfur method |
| CN109806734A (en) * | 2019-01-28 | 2019-05-28 | 西安理工大学 | The dynamic regulation method of desulfurizing agent distributing homogeneity in open ocean fluidized bed at elevated |
| CN109806734B (en) * | 2019-01-28 | 2021-09-10 | 西安理工大学 | Dynamic regulation and control method for distribution uniformity of desulfurizer in fluidized bed under ocean working condition |
| CN110756036A (en) * | 2019-11-29 | 2020-02-07 | 苏州仕净环保科技股份有限公司 | Thermal power plant flue gas wet desulphurization system with multi-parameter monitoring function |
| CN110756036B (en) * | 2019-11-29 | 2024-02-06 | 苏州仕净科技股份有限公司 | Thermal power plant flue gas wet desulfurization system with multi-parameter monitoring function |
| CN111545042A (en) * | 2020-05-12 | 2020-08-18 | 江苏峰峰鸿运环保科技发展有限公司 | Flue gas semi-dry desulfurization device and method |
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