CN202315660U - High-efficiency low-cost mercury pollution control system for coal-fired power plant - Google Patents
High-efficiency low-cost mercury pollution control system for coal-fired power plant Download PDFInfo
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- CN202315660U CN202315660U CN2011203567839U CN201120356783U CN202315660U CN 202315660 U CN202315660 U CN 202315660U CN 2011203567839 U CN2011203567839 U CN 2011203567839U CN 201120356783 U CN201120356783 U CN 201120356783U CN 202315660 U CN202315660 U CN 202315660U
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 71
- 239000003245 coal Substances 0.000 claims abstract description 88
- 239000000654 additive Substances 0.000 claims abstract description 30
- 230000000996 additive effect Effects 0.000 claims abstract description 28
- 150000004820 halides Chemical class 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims description 42
- 239000002817 coal dust Substances 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 35
- 239000003546 flue gas Substances 0.000 abstract description 35
- 230000003647 oxidation Effects 0.000 abstract description 10
- 238000007254 oxidation reaction Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- 229910000474 mercury oxide Inorganic materials 0.000 abstract description 8
- UKWHYYKOEPRTIC-UHFFFAOYSA-N mercury(ii) oxide Chemical compound [Hg]=O UKWHYYKOEPRTIC-UHFFFAOYSA-N 0.000 abstract description 8
- 238000006477 desulfuration reaction Methods 0.000 abstract description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 3
- 239000003344 environmental pollutant Substances 0.000 abstract 1
- 231100000719 pollutant Toxicity 0.000 abstract 1
- 230000002195 synergetic effect Effects 0.000 abstract 1
- 229910001622 calcium bromide Inorganic materials 0.000 description 23
- WGEFECGEFUFIQW-UHFFFAOYSA-L calcium dibromide Chemical compound [Ca+2].[Br-].[Br-] WGEFECGEFUFIQW-UHFFFAOYSA-L 0.000 description 23
- 238000000034 method Methods 0.000 description 15
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 14
- 239000001110 calcium chloride Substances 0.000 description 13
- 229910001628 calcium chloride Inorganic materials 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 12
- 239000000126 substance Substances 0.000 description 10
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- 239000011259 mixed solution Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000023556 desulfurization Effects 0.000 description 5
- 229910052736 halogen Inorganic materials 0.000 description 5
- 150000002367 halogens Chemical class 0.000 description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 description 5
- 235000011152 sodium sulphate Nutrition 0.000 description 5
- BMYNFMYTOJXKLE-UHFFFAOYSA-N 3-azaniumyl-2-hydroxypropanoate Chemical compound NCC(O)C(O)=O BMYNFMYTOJXKLE-UHFFFAOYSA-N 0.000 description 4
- 239000012456 homogeneous solution Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 230000005619 thermoelectricity Effects 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000031709 bromination Effects 0.000 description 1
- 238000005893 bromination reaction Methods 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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Abstract
The utility model discloses a high-efficiency low-cost mercury pollution control system for a coal-fired power plant. The system comprises a primary air warm-air pipe and a secondary air warm-air pipe which are communicated with an air preheater and a furnace cavity, a coal conveying system communicated with a coal grinding system through a coal feeder, and a liquid storage tank, wherein a halide additive solution is arranged in the liquid storage tank; the liquid storage tank is communicated with at least one of the coal conveying system, the coal feeder, the primary air warm-air pipe and the secondary air warm-air pipe; by the system, the halide additive solution enters in a boiler body to engage in combustion reaction to promote the oxidation of mercury in flue gas and increase the ratio of mercury oxide in the flue gas so as to improve the synergic mercury removal effect of flue gas purifying equipment such as denitration, desulfuration and dedusting and the like in a flue at the tail part of a boiler, therefore, the content of mercury in the flue gas in a chimney is greatly reduced. The mercury pollution control system has the advantages of low invest and operation costs while the mercury pollutant discharge level in the coal-fired power plant meets the more strict environmental protection standard requirements.
Description
Technical field
The utility model belongs to environmental protection technical field, relates to the groundwater pollution control of coal-burning power plant, is specifically related to a kind of coal-burning power plant mercury pollution control system of high efficiency, low cost.
Background technology
Mercury is a kind of hypertoxicity material, can produce long-term and serious harm to environment, human body.And global coal-fired mercury emission accounts for 2/3 of artificial mercury emission.China is as consumption of coal big country, and mercury emissions that causes in the coal-fired process and pollution thereof are severe more.Therefore, China is listed mercury pollution control work in " heavy metal pollution control " 12 " planning ", and the mercury and the compound thereof that have tentatively proposed coal-burning power plant's discharging must be lower than 0.03mg/m
3The emission limit set requirement.
At present, a series of theoretical research has been carried out in domestic mercury pollution control to the coal-burning power plant, but does not carry out practical applications as yet.External then practice through has for many years accumulated the invaluable experience of coal-burning power plant's mercury pollution control.External ripe mercury pollution control technology mainly is divided into two types, and one type is absorption demercuration technology, and one type is collaborative demercuration technology.
Absorption demercuration technology is to utilize adsorbent such as active carbon, and the mercury in the flue gas is carried out adsorbing and removing.What patent " was used for removing the adsorbent and the corresponding demercuration method of flue gas mercury " (patent No. CN03816017.X) announce is exactly the Powdered bromination preparation method of active carbon that realizes that high-efficiency mercury removal is special-purpose, and adsorbent is sprayed into the method that realizes mercury pollution control behind the air preheater.The main feature of absorption demercuration technology is a wide adaptability, but investment and operating cost are high, and power plant generally is difficult to bear.
Collaborative demercuration technology then is to utilize the existing flue gas purifying equipment of power plant, when realizing desulfurization, denitration, dedusting, realizes collaborative demercuration.What patent " method of mercury removal for smoke desulfurizing system by fortified wetting " (patent No. 200610028333) was announced is exactly through in desulfurization slurry, adding some kinds of sulfur-bearing chemical stabilizers or chelating agent, improving the method for the demercuration efficient of wet desulfurization system.The main feature of collaborative demercuration technology is that investment and operating cost are lower, but demercuration efficient has received the restriction of flue gas purification system and coal.
Mercury in coal-burning power plant's discharging flue gas can be divided three classes: simple substance mercury, mercury oxide, particle mercury.Experimental study shows: the ratio of the simple substance mercury in the flue gas, relevant with the content of elements such as chlorine, bromine, calcium, iron in the coal, especially when content of halogen was low, the ratio of simple substance mercury was high in the flue gas.Dust pelletizing system can remove the particle mercury of the overwhelming majority, but limited to the removal effect of simple substance mercury and mercury oxide, and the being proportionate property of ratio of the ratio of particle mercury and mercury oxide.Desulphurization system can realize efficiently removing of mercury oxide, but simple substance mercury is not almost had removal effect.Denitrating system can make the simple substance mercury oxidation in the flue gas, but when content of halogen was low in the flue gas, oxidation effectiveness was poor.
Therefore; Collaborative demercuration technology is better to the removal effect of mercury oxide and particle mercury; But the removal effect to simple substance mercury is poor, and when the simple substance mercury content was very high in especially low when content of halogen in the coal, the flue gas, the collaborative demercuration effect of desulfurization, denitration, dust arrester all can obviously descend.And the content of halogen in China's coal is generally lower, therefore utilizes existing flue gas purification system possibly be difficult to obtain collaborative preferably demercuration effect simply.
By the end of the year 2009, in China coal-burning power plant, 100% cleaner is installed, and the unit that has a desulphurization system accounts for 71% of thermoelectricity installed capacity, the unit that has denitrating system accounts for 6.7% of thermoelectricity installed capacity, and will keep growing at top speed.Consider that simultaneously collaborative demercuration technology is with low cost with absorption demercuration compared with techniques; Therefore, make full use of existing flue gas purification system, exploitation can improve the technical matters of collaborative demercuration efficient; Be the mercury pollution control technology that is suitable for China coal-burning power plant, have very important significance.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art; The purpose of the utility model is to provide a kind of coal-burning power plant mercury pollution control system of high efficiency, low cost; Through adding halide additive in the coal or in the combustion air, making halide additive get into burner hearth and participate in burning, thereby improve the ratio of mercury oxide in the flue gas; And then improve the collaborative demercuration effect of flue gas purifying equipments such as denitration, desulfurization, dedusting, and investment and the low advantage of operating cost have been kept.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is:
A kind of coal-burning power plant mercury pollution control system of high efficiency, low cost; Comprise the secondary wind hot air duct 7 that is communicated with boiler body 6; Secondary wind hot air duct 7 is communicated with air preheater 15, and air preheater 15 also is communicated with 11, wind-heat airducts road 11, a wind-heat airduct road and is communicated with coal pulverizer 10; Coal pulverizer 10 is communicated with boiler body 6; Also comprise fluid reservoir 5, at least one in fluid reservoir 5 and wind-heat airduct road 11 and the secondary wind hot air duct 7 is connected, and halide additive solution is arranged in the fluid reservoir 5.
The another kind of mode of the utility model; Comprise that 11, the wind-heat airducts road 11, a wind-heat airduct road that is communicated with air preheater 15 is communicated with coal pulverizer 10, coal pulverizer 10 is communicated with boiler body 6; Coal handling system 2 is communicated with coal pulverizer 10 through feeder 3; Also comprise fluid reservoir 5, fluid reservoir 5 is communicated with coal handling system 2 or feeder 3, and halide additive solution is arranged in the fluid reservoir 5.
The another kind of mode of the utility model; Comprise the secondary wind hot air duct 7 that is communicated with boiler body 6; Secondary wind hot air duct 7 also is communicated with secondary wind arm 21 and air preheater 15, and secondary wind arm 21 is communicated with coal pulverizer 10, and coal pulverizer 10 is connected with Pulverized Coal Bin 20 through coal dust classifier 19; Pulverized Coal Bin 20 is communicated with boiler body 6; Pulverized Coal Bin 20 is communicated with air preheater 15 through a wind-heat airduct road 11, and coal handling system 2 is communicated with coal pulverizer 10 through feeder 3, also comprises fluid reservoir 5; In fluid reservoir 5 and coal handling system 2, feeder 3, wind-heat airduct road 11, the secondary wind hot air duct 7 at least one is connected, and halide additive solution is arranged in the fluid reservoir 5.
In the described several kinds of systems, between the outlet of boiler body 6 and air preheater 15, denitrating system 14 is set, air preheater 15 is communicated with deduster 16, desulphurization system 17 and chimney 18 again successively.
In the described system; Halide is villaumite, bromine salt, salt compounded of iodine or their mixture or the mixture that contains them; Such as calcium chloride, calcium bromide, hydrobromic acid, KI or their mixture; Can also be to contain halid mixture, as: the mixture of calcium bromide, calcium chloride and sodium sulphate.
Compared with prior art, the utility model has the advantages that:
1) low to content of halogen in China's coal; Thereby cause the high characteristics of simple substance mercury content in the flue gas; Through in coal and/or combustion air, adding halide additive; Make halide get into burner hearth uniformly and participate in burning, can effectively increase the ratio of mercury oxide in the flue gas, thereby utilize the existing flue gas purification system in coal-burning power plant to obtain higher demercuration efficient.
2) this method only need add a spot of comparatively cheap halide additive and can realize mercury pollution control efficiently, and medicine machine is simple, and cost of investment and operating cost are all technological well below the absorption demercuration.
3) the actual multiple additives of having set forth of this method adds mode.Wherein, in coal handling system, add additive, have the advantage that system is simple, medicine system is few, but time-delay is longer if adopt; In feeder or coal pulverizer, add additive if adopt, the short operation of then delaying time is convenient, but medicine system quantity is more; In first and second hot blast, add additive if adopt, then the simple quantity of equipment is few, and easy to operate time-delay is short.
Description of drawings
Fig. 1 is the operation principle structural representation of the embodiment 1 of the utility model, adopts in secondary wind hot air duct and a wind-heat airduct road, to add calcium chloride solution.
Fig. 2 is the operation principle structural representation of the embodiment 2 of the utility model, adopts in a wind-heat airduct road of unit pulverized-coal system, to add calcium bromide solution.
Fig. 3 is the operation principle structural representation of the embodiment 3 of the utility model, adopts the mixed solution that in a wind-heat airduct road of bin storage type pulverizing system, adds calcium bromide and calcium chloride.
Fig. 4 is the operation principle structural representation of the embodiment 4 of the utility model, adopts in the secondary wind hot air duct of unit pulverized-coal system, to add hydrobromic acid solution, no denitrating system.
Fig. 5 is the operation principle structural representation of the embodiment 5 of the utility model, adopts in the feeder of unit pulverized-coal system, to add calcium bromide solution.
Fig. 6 is the operation principle structural representation of the embodiment 6 of the utility model, adopts the mixed solution that in the coal handling system of unit pulverized-coal system, adds calcium bromide, KI.
Fig. 7 is the operation principle structural representation of the embodiment 7 of the utility model, adopts the mixed solution that in the feeder of bin storage type pulverizing system, adds calcium bromide, calcium chloride and sodium sulphate, no denitrating system.
The specific embodiment
Embodiment one
As shown in Figure 1; A kind of coal-burning power plant mercury pollution control system of high efficiency, low cost comprises the secondary wind hot air duct 7 that is communicated with boiler body 6, and secondary wind hot air duct 7 is communicated with air preheater 15; Also comprise a wind-heat airduct road 11 that is communicated with air preheater 15; One time wind-heat airduct road 11 is communicated with coal pulverizer 10, and coal pulverizer 10 is communicated with boiler body 6, and coal handling system 2 is communicated with coal pulverizer 10 through feeder 3; Be used for to coal pulverizer 10 coal supplies; Air preheater 15 is connected with primary air fan 12 and overfire air fan 13, gives wind-heat airduct road 11 and secondary wind hot air duct 7 air feeds respectively, between the outlet of boiler body 6 and air preheater 15, denitrating system 14 is set; Air preheater 15 is communicated with deduster 16, desulphurization system 17 and chimney 18 again successively, and fluid reservoir 5 is communicated with secondary wind hot air duct 7 with a wind-heat airduct road 11 with secondary wind dosing mouth 8 through a wind dosing mouth 4 respectively.
Its method that realizes mercury pollution control is following:
Halide additive selective chlorination calcium in the fluid reservoir 5.Calcium chloride is in fluid reservoir 5; After being formulated into the homogeneous solution of 4mol/L; Add in wind-heat airduct road 11 and the secondary wind hot air duct 7 by wind dosing mouth 4 and secondary wind dosing mouth 8 respectively; Bring boiler body 6 into by wind and secondary wind and participate in burning, promote the oxidation of the mercury in the flue gas to make the flue gas mercury content in the chimney 18 reach emission request, the ratio 40mg/Nm of calcium chloride addition and wind and secondary wind total amount
3A described wind dosing mouth 4 is arranged in wind-heat airduct road 11 one time, and its quantity is corresponding one by one with a wind-heat airduct road 11, is two; Secondary wind dosing mouth 8 is arranged in secondary wind hot air duct 7, and its quantity is corresponding one by one with secondary wind hot air duct 7, is two.Because in the normal course of operation, the air quantity of wind and secondary wind is constant basically, so the addition of calcium chloride is also constant basically, need not frequent adjustment.
In the present embodiment, demercuration efficient can reach more than 65%.
Embodiment two
As shown in Figure 2; A kind of coal-burning power plant mercury pollution control system of high efficiency, low cost comprises the secondary wind hot air duct 7 that is communicated with boiler body 6, and secondary wind hot air duct 7 is communicated with air preheater 15; Also comprise a wind-heat airduct road 11 that is communicated with air preheater 15; One time wind-heat airduct road 11 is communicated with coal pulverizer 10, and coal pulverizer 10 is communicated with boiler body 6, and coal handling system 2 is communicated with coal pulverizer 10 through feeder 3; Be used for to coal pulverizer 10 coal supplies; Air preheater 15 is connected with primary air fan 12 and overfire air fan 13, gives wind-heat airduct road 11 and secondary wind hot air duct 7 air feeds respectively, between the outlet of boiler body 6 and air preheater 15, denitrating system 14 is set; Air preheater 15 is communicated with deduster 16, desulphurization system 17 and chimney 18 again successively, and fluid reservoir 5 only is communicated with a wind-heat airduct road 11 through a wind dosing mouth 4.
Its method that realizes mercury pollution control is following:
Halide additive in the fluid reservoir 5 is selected calcium bromide.Calcium bromide is in fluid reservoir 5; After being formulated into the homogeneous solution of 4mol/L; In wind-heat airduct road 11 of wind dosing mouth 4 addings; Bring boiler body 6 into by a wind and participate in burning, promote the oxidation of the mercury in the flue gas to make the flue gas mercury content in the chimney 18 reach emission request, the ratio of a calcium bromide addition and a wind air quantity of standard is 40mg/Nm
3A described wind dosing mouth 4 is arranged in wind-heat airduct road 11 one time, and its quantity is corresponding one by one with a wind-heat airduct road 11, is two, thereby has reduced the quantity and the complexity thereof of additive injection system.After additive adds from a wind dosing mouth 4 simultaneously, will get into coal pulverizer 10, thereby realize that additive mixes participation burning then with a wind more equably.Because in the normal course of operation, the air quantity of a wind is constant basically, so the addition of calcium bromide is also constant basically, need not frequent adjustment.
In the present embodiment, demercuration efficient can reach more than 80%.
Embodiment three
As shown in Figure 3, a kind of coal-burning power plant mercury pollution control system of high efficiency, low cost comprises the secondary wind hot air duct 7 that is communicated with boiler body 6; Secondary wind hot air duct 7 is communicated with air preheater 15, also comprises the secondary wind arm 21 that is communicated with air preheater 15 and secondary wind hot air duct 7, and secondary wind arm 21 is communicated with coal pulverizer 10; Coal pulverizer 10 is communicated with boiler body 6, and coal handling system 2 is communicated with coal pulverizer 10 through feeder 3, is used for to coal pulverizer 10 coal supplies; Coal pulverizer 10 is connected with Pulverized Coal Bin 20 through coal dust classifier 19, and Pulverized Coal Bin 20 is communicated with boiler body 6, and Pulverized Coal Bin 20 is communicated with air preheater 15 through a wind-heat airduct road 11; Air preheater 15 is connected with primary air fan 12 and overfire air fan 13; Give wind-heat airduct road 11 and secondary wind hot air duct 7 air feeds respectively, between the outlet of boiler body 6 and air preheater 15, denitrating system 14 is set, air preheater 15 is communicated with deduster 16, desulphurization system 17 and chimney 18 again successively; Also comprise fluid reservoir 5; Fluid reservoir 5 is communicated with a wind-heat airduct road 11 through a wind dosing mouth 4, and a described wind dosing mouth 4 is arranged in wind-heat airduct road 11 one time, and its quantity is corresponding one by one with a wind-heat airduct road 11; Be two, thereby reduced the quantity and the complexity thereof of additive injection system.
Its method that realizes mercury pollution control is following:
Halide additive in the fluid reservoir 5 is selected the mixed solution of calcium bromide and calcium chloride.In fluid reservoir 5, calcium bromide concentration is 3mol/L, and calcium chloride concentration is 5mol/L; Then; In wind-heat airduct road 11 of wind dosing mouth 4 addings, bring boiler body 6 into by a wind and participate in burning, promote the oxidation of the mercury in the flue gas to make the flue gas mercury content in the chimney 18 reach emission request; In the present embodiment, the ratio of a calcium bromide and a wind air quantity of standard is 30mg/Nm
3, the ratio of a calcium chloride and a wind air quantity of standard is about 28mg/Nm
3Additive will get into Pulverized Coal Bin 20 after adding from a wind dosing mouth 4, thereby realize that additive mixes participation burning then with a wind more equably.Because in the normal course of operation, the air quantity of a wind is constant basically, so the addition of additive mixed solution is also constant basically, need not frequent adjustment.
In the present embodiment, demercuration efficient can reach more than 80%.
Embodiment four
As shown in Figure 4; Be with the difference of embodiment one; No out of stock system 14 between boiler body 6 and the air preheater 15; Fluid reservoir 5 only is communicated with secondary wind hot air duct 7 through secondary wind dosing mouth 8, and described secondary wind dosing mouth 8 is arranged in secondary wind hot air duct 7, and its quantity is corresponding one by one with secondary wind hot air duct 7.
Its method that realizes mercury pollution control is following:
Halide additive in the fluid reservoir 5 is selected hydrobromic acid.Hydrobromic acid is in fluid reservoir 5; Be formulated into the homogeneous solution of 2mol/L; Add in the secondary wind hot air duct 7 by secondary wind dosing mouth 8; Bring boiler body 6 into by secondary wind and participate in burning, promote the oxidation of the mercury in the flue gas to make the flue gas mercury content in the chimney 18 reach emission request, the ratio of mixed solution addition and standard secondary wind air quantity is 50mg/Nm
3Because in the normal course of operation, the air quantity of secondary wind is constant basically, so hydrobromic addition is also constant basically, need not frequent adjustment.
In the present embodiment, demercuration efficient can reach more than 70%.
Embodiment five
As shown in Figure 5, be that with the difference of embodiment one fluid reservoir 5 is connected with feeder 3 through feeder dosing mouth 9, its quantity is corresponding one by one with the quantity of feeder 3, is 4 covers.。
Its method that realizes mercury pollution control is following:
Halide additive in the fluid reservoir 5 is selected calcium bromide.Calcium bromide is formulated into the homogeneous solution of 4mol/L in fluid reservoir 5, added in the feeder 3 by feeder dosing mouth 9; Gone into to participate in burning in the boiler body 6 by the ribbing, promote the oxidation of the mercury in the flue gas to make the flue gas mercury content in the chimney 18 reach emission request, the ratio of calcium bromide addition and coal-supplying amount is 10～500ppm; In the present embodiment; Select 100ppm, system is simple, and is easy to operate.
In the present embodiment, demercuration efficient can reach more than 80%.
Embodiment six
As shown in Figure 6, be that with the difference of embodiment one fluid reservoir 5 is connected with coal handling system 2 through defeated coal dosing mouth 1, described defeated coal dosing mouth 1 is positioned at the posterior segment of coal handling system 2, and its quantity is corresponding one by one with the quantity of coal handling system 2, is 2 and overlaps.
Its method that realizes mercury pollution control is following:
Halide additive in the fluid reservoir 5 is selected the mixture of calcium bromide and KI.In fluid reservoir 5, calcium bromide concentration is 3mol/L, and KI concentration is 1mol/L; Add in the coal handling system 2 by defeated coal dosing mouth 1, go into to participate in burning in the boiler body 6, promote the oxidation of the mercury in the flue gas to make the flue gas mercury content in the chimney 18 reach emission request by the ribbing; In the present embodiment, the ratio of calcium bromide addition and coal-supplying amount is 80ppm, and the ratio of corresponding KI addition and coal-supplying amount is about 22ppm; System is simple, and is easy to operate, and equipment is less.
In the present embodiment, demercuration efficient can reach more than 75%.
Embodiment seven
As shown in Figure 7, be with the difference of embodiment three, no out of stock system 14 between boiler body 6 and the air preheater 15, fluid reservoir 5 is connected with feeder 3 through feeder dosing mouth 9, and its quantity is corresponding one by one with the quantity of feeder 3, is 6 covers.
Its method that realizes mercury pollution control is following:
Halide additive in the fluid reservoir 5 is selected the mixture of calcium bromide, calcium chloride and sodium sulphate.In fluid reservoir 5, calcium bromide concentration is 3mol/L, and calcium chloride concentration is 2mol/L; Sodium sulfate concentration is 0.5mol/L, is added in the coal handling system 2 by defeated coal dosing mouth 1, is gone into to participate in burning in the boiler body 6 by the ribbing; Promote the oxidation of the mercury in the flue gas to make the flue gas mercury content in the chimney 18 reach emission request; In the present embodiment, the ratio of calcium bromide addition and coal-supplying amount is 80ppm, and the ratio that the ratio of corresponding calcium chloride addition and coal-supplying amount is about 30ppm, sodium sulphate addition and coal-supplying amount is about 9.5ppm; System is simple, and is easy to operate.
In the present embodiment, demercuration efficient can reach more than 70%.
According to above embodiment, according to actual needs, when system has comprised coal handling system 2, feeder 3, wind-heat airduct road 11, secondary wind hot air duct 7 and secondary wind arm 21, fluid reservoir 5 can with wherein any one or a plurality of the connection.
In the utility model, the implication of Reference numeral is following:
1, defeated coal dosing mouth, 2, coal handling system, 3, feeder, 4, wind dosing mouths, 5, fluid reservoir, 6, boiler body; 7, secondary wind hot air duct, 8, the secondary wind dosing mouth, 9, the feeder dosing mouth, 10, coal pulverizer, 11, wind-heat airduct roads; 12, primary air fan, 13, overfire air fan, 14, denitrating system, 15, air preheater, 16, deduster; 17, desulphurization system, 18, chimney, 19, coal dust classifier, 20, Pulverized Coal Bin, 21, the secondary wind arm.
Claims (6)
1. coal-burning power plant's mercury pollution of a high efficiency, low cost is controlled system; Comprise the secondary wind hot air duct (7) that is communicated with boiler body (6), secondary wind hot air duct (7) is communicated with air preheater (15), and air preheater (15) also is communicated with a wind-heat airduct road (11); A wind-heat airduct road (11) is communicated with coal pulverizer (10); Coal pulverizer (10) is communicated with boiler body (6), it is characterized in that, also comprises fluid reservoir (5); In fluid reservoir (5) and a wind-heat airduct road (11) and the secondary wind hot air duct (7) at least one is connected, and fluid reservoir has halide additive solution in (5).
2. coal-burning power plant's mercury pollution of high efficiency, low cost according to claim 1 is controlled system; It is characterized in that; Between the outlet of boiler body (6) and air preheater (15), denitrating system (14) is set, air preheater (15) is communicated with deduster (16), desulphurization system (17) and chimney (18) again successively.
3. the coal-burning power plant mercury pollution control system of a high efficiency, low cost comprises a wind-heat airduct road (11) that is communicated with air preheater (15), and a wind-heat airduct road (11) is communicated with coal pulverizer (10); Coal pulverizer (10) is communicated with boiler body (6); Coal handling system (2) is communicated with coal pulverizer (10) through feeder (3), it is characterized in that, also comprises fluid reservoir (5); Fluid reservoir (5) is communicated with coal handling system (2) or feeder (3), and fluid reservoir has halide additive solution in (5).
4. coal-burning power plant's mercury pollution of high efficiency, low cost according to claim 3 is controlled system; It is characterized in that; Between the outlet of boiler body (6) and air preheater (15), denitrating system (14) is set, air preheater (15) is communicated with deduster (16), desulphurization system (17) and chimney (18) again successively.
5. coal-burning power plant's mercury pollution of a high efficiency, low cost is controlled system; Comprise the secondary wind hot air duct (7) that is communicated with boiler body (6), secondary wind hot air duct (7) also is communicated with secondary wind arm (21) and air preheater (15), and secondary wind arm (21) is communicated with coal pulverizer (10); Coal pulverizer (10) is connected with Pulverized Coal Bin (20) through coal dust classifier (19); Pulverized Coal Bin (20) is communicated with boiler body (6), and Pulverized Coal Bin (20) is communicated with air preheater (15) through a wind-heat airduct road (11), and coal handling system (2) is communicated with coal pulverizer (10) through feeder (3); It is characterized in that; Also comprise fluid reservoir (5), at least one in fluid reservoir (5) and coal handling system (2), feeder (3), a wind-heat airduct road (11), the secondary wind hot air duct (7) is connected, and fluid reservoir has halide additive solution in (5).
6. coal-burning power plant's mercury pollution of high efficiency, low cost according to claim 5 is controlled system; It is characterized in that; Between the outlet of boiler body (6) and air preheater (15), denitrating system (14) is set, air preheater (15) is communicated with deduster (16), desulphurization system (17) and chimney (18) again successively.
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| CN2011203567839U CN202315660U (en) | 2011-09-21 | 2011-09-21 | High-efficiency low-cost mercury pollution control system for coal-fired power plant |
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| CN2011203567839U CN202315660U (en) | 2011-09-21 | 2011-09-21 | High-efficiency low-cost mercury pollution control system for coal-fired power plant |
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| CN202315660U true CN202315660U (en) | 2012-07-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103285720A (en) * | 2013-07-02 | 2013-09-11 | 中国环境科学研究院 | Method and device for removing mercury in flue gas by utilizing organic wastes |
| CN104033917A (en) * | 2014-06-04 | 2014-09-10 | 中国华能集团清洁能源技术研究院有限公司 | Coal powder boiler with high-temperature SNCR (selective non-catalytic reduction) denitration reactors |
| CN104676637A (en) * | 2015-02-13 | 2015-06-03 | 北京智仁信业技术有限责任公司 | Processing system for blended coal combustion in power plant |
| WO2022193557A1 (en) * | 2021-03-15 | 2022-09-22 | 苏州西热节能环保技术有限公司 | Halogen injection system for synergistic mercury removal of flue gas |
-
2011
- 2011-09-21 CN CN2011203567839U patent/CN202315660U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103285720A (en) * | 2013-07-02 | 2013-09-11 | 中国环境科学研究院 | Method and device for removing mercury in flue gas by utilizing organic wastes |
| CN104033917A (en) * | 2014-06-04 | 2014-09-10 | 中国华能集团清洁能源技术研究院有限公司 | Coal powder boiler with high-temperature SNCR (selective non-catalytic reduction) denitration reactors |
| CN104676637A (en) * | 2015-02-13 | 2015-06-03 | 北京智仁信业技术有限责任公司 | Processing system for blended coal combustion in power plant |
| WO2022193557A1 (en) * | 2021-03-15 | 2022-09-22 | 苏州西热节能环保技术有限公司 | Halogen injection system for synergistic mercury removal of flue gas |
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Effective date of registration: 20161214 Address after: 100031 Beijing, Xicheng District, the door of the revitalization of the main street, No. 6 Patentee after: Huaneng Power International,Inc. Patentee after: HUANENG CLEAN ENERGY Research Institute Address before: 100098 Beijing city Haidian District No. 48 Zhichun Road Yingdu building A block 26 layer Patentee before: HUANENG CLEAN ENERGY Research Institute |
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Granted publication date: 20120711 |