CN205361050U - Based on sulfur dioxide desorption system in wet flue gas desulfurization technique coal fired power plant flue gas - Google Patents
Based on sulfur dioxide desorption system in wet flue gas desulfurization technique coal fired power plant flue gas Download PDFInfo
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Abstract
The utility model discloses a based on sulfur dioxide desorption system in wet flue gas desulfurization technique coal fired power plant flue gas, including the stokehold wet split system that connects in order for be clean coal and gangue with raw coal sorting, coal fired boiler is used for burning the clean coal produces the flue gas, lime stone - gypsum wet process double tower dual cycle desulfurizing tower, it is right to be used for the flue gas that coal fired boiler produced carries out the desulfurization, obtains desulfurizing tower export flue gas, the pressure swing adsorption desulfurizing tower is used for the warp flue gas after lime stone - gypsum wet process double tower dual cycle desulfurizing tower desulfurization carries out further desulfurization and obtains chimney entry flue gas. Through stokehold wet flue gas desulfurization technique, get rid of the gangue, sulfur content in the coal of reduction income stove burning, sulfur dioxide desorption efficiency reaches more than 99% in the desulfurizing tower export flue gas, sulfur dioxide concentration reaches coal fired power plant 35mgNm3's ultralow emission standard in the chimney entry flue gas, can discharge to the atmosphere in.
Description
Technical field
This utility model belongs to Flue Gas Desulfurization Technology of Power Plant field, is specifically related to a kind of based on sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas.
Background technology
At present, National Development and Reform Committee, national environmental protection portion and National Energy Board put into effect " coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-2020) ", encouraging west area new-built unit pollutant emission close to or up gas turbine group emission limit, namely sulfur dioxide, nitrogen oxides and soot emissions limit value are 35mg/Nm3、50mg/Nm3、5mg/Nm3.But Southwestern China Areas For Coal ature of coal has the feature of high ash, high-sulfur, it can be used as the sulfur dioxide of coal-burning power plant's as-fired coal kind burning generation and dust concentration higher than low-sulfur, low culm, if thus adopt conventional Pollutant Treatment technology, sulfur dioxide and dust emission concentration are difficult to reach 35mg/Nm3、5mg/Nm3Minimum discharge standard.
Coal-burning power plant's commercialization fume desulphurization method is mainly limestone-gypsum calcium method sulfur removal technology.Relative to low-sulfur coal, after the medium-high sulfur coal kind burning in Southwestern China area, the sulfur dioxide concentration in flue gas is higher, adopts this technique to will be unable to realize the standard of minimum discharge.Therefore, carry out the sulfur dioxide minimum discharge technology for Coal rank at present, for realizing the pollutant minimum discharge of southwest coal-burning power plant, have important practical significance.
Chinese patent literature CN104014238A discloses a kind of boiler smoke desulfurizer, including cleaner unit, hair-dryer, heat-exchanger rig, desulfurizing tower and denitration mixing arrangement, the outlet of described cleaner unit is connected with the entrance of described hair-dryer, the exit of described hair-dryer is respectively equipped with flue, the entrance of described heat-exchanger rig is connected with described flue, the outlet of described heat-exchanger rig is connected with the entrance of described desulfurizing tower, described denitration mixing arrangement is set in the exit of described desulfurizing tower, make use of hot swapping, so that the utilization of rational energy, thus effectively have activated the catalyst of denitrating system to complete the work of denitration, but, this boiler smoke desulfurizer can not solve the sulfur dioxide emissioning concentration height that Southwestern China area coal-burning power plant burning high sulfur coal is brought, the problem being difficult to reach minimum discharge standard.
Utility model content
The purpose of this utility model is in that to solve the sulfur dioxide emissioning concentration height that Southwestern China area coal-burning power plant burning high sulfur coal is brought, the problem being difficult to reach minimum discharge standard, and then provides a kind of based on sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas.
In order to solve above-mentioned technical problem, the technical solution of the utility model is as follows:
Provided by the utility model based on sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas, including the stokehold wet split system being sequentially connected with, in order to being cleaned coal and gangue by raw coal separation；Coal-burning boiler, in order to the described cleaned coal that burns, produces flue gas；Gypsum Wet double tower double circulation desulphurization tower, carries out desulfurization in order to the flue gas that described coal-burning boiler is produced；Pressure-variable adsorption desulfurizing tower, obtains chimney inlet flue gas in order to the flue gas after described Gypsum Wet double tower double circulation desulphurization tower desulfurization is carried out further desulfurization；
The cleaned coal outlet of described stokehold wet split system is connected with the cleaned coal entrance of described coal-burning boiler；The back-end ductwork of described coal-burning boiler is connected with the smoke inlet of described Gypsum Wet double tower double circulation desulphurization tower；The described exhanst gas outlet of Gypsum Wet double tower double circulation desulphurization tower is connected with the smoke inlet of described pressure-variable adsorption desulfurizing tower.
Above-mentioned based in sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas, described Gypsum Wet double tower double circulation desulphurization tower is be linked in sequence the one-level prewashing column and two grades of main absorption towers that arrange；
Described one-level prewashing column middle and lower part arranges smoke inlet, and inside arranges some spraying layers, and top arranges exhanst gas outlet；
Middle and lower part, described two grades of main absorption towers arranges smoke inlet, and described one-level prewashing column exhanst gas outlet connects with described two grades of main adsorption tower smoke entrances；Arranging some spraying layers inside described two grades of main absorption towers, top arranges exhanst gas outlet；
It is provided with limestone slurry liquid pool bottom described one-level prewashing column and described two grades of main absorption towers, fresh lime stone slurry passes into described two grades of main absorption towers, and some spraying layers that the serosity in limestone pond is pumped in described two grades of main absorption towers by slurry circulating pump are set spray sulfur dioxide absorption, serosity in limestone slurry liquid pool bottom described two grades of main absorption towers is pumped in described one-level pre-absorption tower by pump simultaneously, and is pumped in described one-level prewashing column some spraying layers by the slurry circulating pump of described one-level prewashing column and sprays.
Described pressure-variable adsorption desulfurizing tower includes a packed tower, or, the packed tower of some parallel connections；It is connected with top, described two grades of main absorption towers exhanst gas outlet bottom described packed tower；
Described packed tower top arranges exhanst gas outlet, discharges in order to the exhanst gas outlet arranged from top by the flue gas entered bottom described packed tower.
Further, the adsorbent layer of at least one formation being provided with in zeolite molecular sieve, 5A molecular sieve, 4A molecular sieve, 3A molecular sieve, carbon molecular sieve, activated carbon, 13X molecular sieve, ZSM-5, aluminium oxide and silica gel in described packed tower；
The number of plies of described adsorbent layer is at least one layer.
Above-mentioned based in sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas, described stokehold wet split system includes: raw coal separation device, it is provided with screening plant before the entrance of described raw coal separation device, the screening of described screening plant obtains the feed coal that granularity is not more than 50mm, and granularity is not more than the feed coal of 50mm by described raw coal separation device to be carried out sorting and obtain cleaned coal, middle coal and gangue.
Further, described stokehold wet split system also includes: export, with the gangue in described raw coal separation device, the gangue Integrated Processing Unit arranged that is connected, for processing the sulfur and/or metal reclaimed in described gangue；Coal gangue crusher, coal gangues automation selection device and iron concentrate that described gangue Integrated Processing Unit includes being sequentially connected with process system, after described gangue is crushed to granularity of dissociating by described coal gangue crusher, entrance coal gangues automation selection device carries out sorting and obtains mine tailing, chats and iron concentrate, and described iron concentrate enters iron concentrate and processes system process recovery sulfur and/or metal.
Technical solutions of the utility model, have the advantage that
1) the elimination system of sulfur dioxide in the coal-fired plant flue gas that this utility model provides, by stokehold Wet Flue Gas Desulfurization Technique, difference according to spoil and coal proportion, it is gangue and cleaned coal two class by raw coal separation, wherein cleaned coal burns as as-fired coal, spoil is then recovered further utilization, is not used to boiler combustion.Owing in spoil, ash rate example is significantly higher than cleaned coal, in coal, inorganic sulfur is composed with troilite form and is stored in ash, thus part inorganic sulfur is removed by stokehold Wet Flue Gas Desulfurization Technique, thus reducing the sulfur content of coal into stove burning.
2) the elimination system of sulfur dioxide in the coal-fired plant flue gas that this utility model provides, by adopting Gypsum Wet double tower double circulation desulphurization tower, it is achieved sulfur dioxide removal efficiency reaches more than 99%；Realizing sulfur dioxide removal efficiency again through pressure-variable adsorption desulfurizing tower and reach more than 90%, coal-burning power plant's sulfur dioxide emissioning concentration reaches 35mg/Nm3Minimum discharge standard, meet the flue gas of sulfur dioxide minimum discharge requirement and enter after chimney lifting and can discharge to air.
3) the elimination system of sulfur dioxide in the coal-fired plant flue gas that this utility model provides, by adopting two-stage to have the desulfurizing tower of different slurry pH value, further increases the removal efficiency of sulfur dioxide.
4) the elimination system of sulfur dioxide in the coal-fired plant flue gas that this utility model provides, by selecting pressure-variable adsorption desulfurizing tower to be packed tower or the packed tower of some parallel connections further, the adsorbent layer of at least one formation being provided with in zeolite molecular sieve, 5A molecular sieve, 4A molecular sieve, 3A molecular sieve, carbon molecular sieve, activated carbon, 13X molecular sieve, ZSM-5, aluminium oxide and silica gel in described packed tower；The number of plies of described adsorbent layer is at least one layer, further increases the removal efficiency of sulfur dioxide.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model detailed description of the invention or technical scheme of the prior art, the accompanying drawing used required in detailed description of the invention or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is based on the schematic diagram of sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas.
Description of reference numerals:
1-stokehold wet split system；2-burning boiler；3-flue；4-Gypsum Wet double tower double circulation desulphurization tower；5-pressure-variable adsorption desulfurizing tower；6-chimney.
Detailed description of the invention
Below in conjunction with accompanying drawing, the technical solution of the utility model is clearly and completely described, it is clear that described embodiment is a part of embodiment of this utility model, rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.
Described in the present embodiment based on sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas, including the stokehold wet split system 1 being sequentially connected with, in order to being cleaned coal and gangue by raw coal separation；Coal-burning boiler 2, in order to the described cleaned coal that burns, produces flue gas；Gypsum Wet double tower double circulation desulphurization tower 4, carries out desulfurization in order to the flue gas that described coal-burning boiler is produced；Pressure-variable adsorption desulfurizing tower 5, obtains chimney inlet flue gas in order to the flue gas after described Gypsum Wet double tower double circulation desulphurization tower desulfurization is carried out further desulfurization；
The cleaned coal outlet of described stokehold wet split system 1 is connected with the cleaned coal entrance of described coal-burning boiler 2；The back-end ductwork 3 of described coal-burning boiler 2 is connected with the smoke inlet of described Gypsum Wet double tower double circulation desulphurization tower 4；The described exhanst gas outlet of Gypsum Wet double tower double circulation desulphurization tower 4 is connected with the smoke inlet of described pressure-variable adsorption desulfurizing tower 5；The exhanst gas outlet of described pressure-variable adsorption desulfurizing tower 5 is connected with described chimney 6.
The present embodiment obtains cleaned coal and gangue by the raw high-sulfur coal burnt Southwestern China area coal-burning power plant after stokehold separation system 2 (stokehold wet separator) sorts, and before and after sorting, in raw coal, the content of each component is as shown in table 1 below:
The content of each component in raw coal before and after table 1, sorting
As preferred embodiment, described Gypsum Wet double tower double circulation desulphurization tower is be linked in sequence the one-level prewashing column and two grades of main absorption towers that arrange；
Described one-level prewashing column middle and lower part arranges smoke inlet, and inside arranges some spraying layers, and top arranges exhanst gas outlet；
Middle and lower part, described two grades of main absorption towers arranges smoke inlet, and described one-level prewashing column exhanst gas outlet connects with described two grades of main adsorption tower smoke entrances；Arranging some spraying layers inside described two grades of main absorption towers, top arranges exhanst gas outlet；
It is provided with limestone slurry liquid pool bottom described one-level prewashing column and described two grades of main absorption towers, fresh lime stone slurry passes into described two grades of main absorption towers, and some spraying layers that the serosity in limestone pond is pumped in described two grades of main absorption towers by slurry circulating pump are set spray sulfur dioxide absorption, serosity in limestone slurry liquid pool bottom described two grades of main absorption towers is pumped in described one-level pre-absorption tower by pump simultaneously, and is pumped in described one-level prewashing column some spraying layers by the slurry circulating pump of described one-level prewashing column and sprays.
As the embodiment that can select, described pressure-variable adsorption desulfurizing tower includes a packed tower, or, the packed tower of some parallel connections；It is connected with top, described two grades of main absorption towers exhanst gas outlet bottom described packed tower；
Described packed tower top arranges exhanst gas outlet, discharges in order to the exhanst gas outlet arranged from top by the flue gas entered bottom described packed tower.
As preferred embodiment, the adsorbent layer of at least one formation being provided with in zeolite molecular sieve, 5A molecular sieve, 4A molecular sieve, 3A molecular sieve, carbon molecular sieve, activated carbon, 13X molecular sieve, ZSM-5, aluminium oxide and silica gel in described packed tower；
The number of plies of described adsorbent layer is at least one layer.
As the embodiment that can select, also include chimney, in order to discharge to air after described chimney inlet flue gas lifting；The exhanst gas outlet of described pressure-variable adsorption desulfurizing tower is connected with described chimney smoke entrance.
As preferred embodiment, described stokehold wet split system in the present embodiment includes, raw coal separation device, it is provided with screening plant before the entrance of described raw coal separation device, the screening of described screening plant obtains the feed coal that granularity is not more than 50mm, and granularity is not more than the feed coal of 50mm by described raw coal separation device to be carried out sorting and obtain cleaned coal, middle coal and gangue.Experiment confirms: the described stokehold wet split system in the present embodiment can make the deliming rate of raw coal and desulfurization degree respectively reach 45.00% and 40.00%.
Further, described stokehold wet split system also includes, and exports, with the gangue in described raw coal separation device, the gangue Integrated Processing Unit arranged that is connected, for processing the sulfur and/or metal reclaimed in described gangue；Coal gangue crusher, coal gangues automation selection device and iron concentrate that described gangue Integrated Processing Unit includes being sequentially connected with process system, after described gangue is crushed to granularity of dissociating by described coal gangue crusher, entrance coal gangues automation selection device carries out sorting and obtains mine tailing, chats and iron concentrate, and described iron concentrate enters iron concentrate and processes system process recovery sulfur and/or metal.
As a comparison, raw coal and cleaned coal after burning, are obtained boiler back end ductwork flue gas, survey SO therein in coal-burning boiler by this utility model respectively2Content is 13982mg/Nm respectively3And 7310.5mg/Nm3, it is seen that after sorting, SO in boiler back end ductwork flue gas2Content is decreased obviously；Respectively boiler back end ductwork flue gas is passed into again in single column single cycle desulfurizing tower and Gypsum Wet double tower double circulation desulphurization tower 4 and carries out desulfurization process respectively, survey SO in flue gas after desulfurization2Content is 139.82mg/Nm respectively3And 73.11mg/Nm3(desulfuration efficiency of single column single cycle desulfurizing tower in 97%, the desulfuration efficiency of Gypsum Wet double tower double circulation desulphurization tower 4 in 99.9%)；Finally, then by the SO in the further desulfurization of pressure-swing absorber, the flue gas that final system of the present utility model obtains of the flue gas after desulfurization2Content is 7.311mg/Nm3(desulfuration efficiency of this step in 90%).
In order to contrast further, by above-mentioned SO after wet desulphurization2Content is 7310.5mg/Nm3Back-end ductwork flue gas, through the single column further desulfurization of single cycle desulfurizing tower, record SO in the flue gas after desulfurization2Content is 219.3mg/Nm3(desulfuration efficiency in 97%).
Coupling by Gypsum Wet double tower double circulation desulphurization tower 4 and pressure-variable adsorption desulfurizing tower 5, first in Gypsum Wet double tower double circulation desulphurization tower 4, realize sulfur dioxide removal efficiency and reach more than 99%, and then, in pressure-variable adsorption desulfurizing tower 5, realize sulfur dioxide removal efficiency reach more than 90%, reach coal-burning power plant's sulfur dioxide emissioning concentration and reach 35mg/Nm3Minimum discharge standard, meet the flue gas of sulfur dioxide minimum discharge requirement and enter after chimney lifting and discharge to air.
Obviously, above-described embodiment is only for clearly demonstrating example, and is not the restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also cannot all of embodiment be given exhaustive.And the apparent change thus extended out or variation still in this utility model create protection domain among.
Claims (7)
1. based on a sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas, including what be sequentially connected with,
Stokehold wet split system, in order to being cleaned coal and gangue by raw coal separation；
Coal-burning boiler, in order to the described cleaned coal that burns, produces flue gas；
Limestone gypsum wet double tower double circulation desulphurization tower, carries out desulfurization in order to the flue gas that described coal-burning boiler is produced；With,
Pressure-variable adsorption desulfurizing tower, obtains chimney inlet flue gas in order to the flue gas after described limestone gypsum wet double tower double circulation desulphurization tower desulfurization is carried out further desulfurization；
The cleaned coal outlet of described stokehold wet split system is connected with the cleaned coal entrance of described coal-burning boiler；The back-end ductwork of described coal-burning boiler is connected with the smoke inlet of described limestone gypsum wet double tower double circulation desulphurization tower；The exhanst gas outlet of described limestone gypsum wet double tower double circulation desulphurization tower is connected with the smoke inlet of described pressure-variable adsorption desulfurizing tower.
2. as claimed in claim 1 based on sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas, it is characterised in that:
Described limestone gypsum wet double tower double circulation desulphurization tower is be linked in sequence the one-level prewashing column and two grades of main absorption towers that arrange；
Described one-level prewashing column middle and lower part arranges smoke inlet, and inside arranges some spraying layers, and top arranges exhanst gas outlet；
Middle and lower part, described two grades of main absorption towers arranges smoke inlet, and described one-level prewashing column exhanst gas outlet connects with described two grades of main adsorption tower smoke entrances；Arranging some spraying layers inside described two grades of main absorption towers, top arranges exhanst gas outlet；
It is provided with limestone slurry liquid pool bottom described one-level prewashing column and described two grades of main absorption towers, fresh lime stone slurry passes into described two grades of main absorption towers, and some spraying layers that the serosity in limestone pond is pumped in described two grades of main absorption towers by slurry circulating pump are set spray sulfur dioxide absorption, serosity in limestone slurry liquid pool bottom described two grades of main absorption towers is pumped in described one-level pre-absorption tower by pump simultaneously, and is pumped in described one-level prewashing column some spraying layers by the slurry circulating pump of described one-level prewashing column and sprays.
3. as claimed in claim 2 based on sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas, it is characterised in that:
Described pressure-variable adsorption desulfurizing tower includes a packed tower, or, the packed tower of some parallel connections；It is connected with top, described two grades of main absorption towers exhanst gas outlet bottom described packed tower；
Described packed tower top arranges exhanst gas outlet, discharges in order to the exhanst gas outlet arranged from top by the flue gas entered bottom described packed tower.
4. as claimed in claim 3 based on sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas, it is characterised in that:
The adsorbent layer of at least one formation being provided with in zeolite molecular sieve, 5A molecular sieve, 4A molecular sieve, 3A molecular sieve, carbon molecular sieve, activated carbon, 13X molecular sieve, ZSM 5, aluminium oxide and silica gel in described packed tower；
The number of plies of described adsorbent layer is at least one layer.
5. as described in claim 1,2 or 4 based on sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas, it is characterised in that: include chimney, in order to discharge to air after described chimney inlet flue gas lifting；The exhanst gas outlet of described pressure-variable adsorption desulfurizing tower is connected with described chimney smoke entrance.
6. as described in claim 1,2 or 4 based on sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas, it is characterised in that:
Described stokehold wet split system includes,
Raw coal separation device, it is provided with screening plant before the entrance of described raw coal separation device, the screening of described screening plant obtains the feed coal that granularity is not more than 50mm, and granularity is not more than the feed coal of 50mm by described raw coal separation device to be carried out sorting and obtain cleaned coal, middle coal and gangue.
7. as claimed in claim 6 based on sulfur dioxide removal system in Wet Flue Gas Desulfurization Technique coal-fired plant flue gas, it is characterised in that:
Described stokehold wet split system includes,
The gangue Integrated Processing Unit arranged that is connected is exported, for processing the sulfur and/or metal reclaimed in described gangue with the gangue in described raw coal separation device；
Coal gangue crusher, coal gangues automation selection device and iron concentrate that described gangue Integrated Processing Unit includes being sequentially connected with process system, after described gangue is crushed to granularity of dissociating by described coal gangue crusher, entrance coal gangues automation selection device carries out sorting and obtains mine tailing, chats and iron concentrate, and described iron concentrate enters iron concentrate and processes system process recovery sulfur and/or metal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113413741A (en) * | 2021-05-28 | 2021-09-21 | 昆明理工大学 | Method for applying coal gangue and activated slag thereof to tail gas desulfurization |
| CN113773890A (en) * | 2021-08-19 | 2021-12-10 | 珠海市胜彥节能环保科技有限公司 | Catalytic desulfurization treatment method for high-sulfur coal for combustion |
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2015
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113413741A (en) * | 2021-05-28 | 2021-09-21 | 昆明理工大学 | Method for applying coal gangue and activated slag thereof to tail gas desulfurization |
| CN113413741B (en) * | 2021-05-28 | 2023-06-30 | 昆明理工大学 | Gangue and method for desulfurizing tail gas by using activated slag of gangue |
| CN113773890A (en) * | 2021-08-19 | 2021-12-10 | 珠海市胜彥节能环保科技有限公司 | Catalytic desulfurization treatment method for high-sulfur coal for combustion |
| CN113773890B (en) * | 2021-08-19 | 2024-03-08 | 珠海市胜彥节能环保科技有限公司 | Catalytic desulfurization treatment method for high-sulfur coal for combustion |
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