CN112755748A - Boiler dual-alkali desulphurization method - Google Patents
Boiler dual-alkali desulphurization method Download PDFInfo
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- CN112755748A CN112755748A CN202011515591.8A CN202011515591A CN112755748A CN 112755748 A CN112755748 A CN 112755748A CN 202011515591 A CN202011515591 A CN 202011515591A CN 112755748 A CN112755748 A CN 112755748A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention relates to the field of boiler flue gas treatment, in particular to a boiler dual-alkali desulphurization method. It includes: (1) the desulfurization elution tower is internally provided with a multilayer nozzle spraying device, a multilayer mesh plate is arranged below the lowest layer of the multilayer nozzle spraying device, holes in the mesh plate are divided into an upper hole and a lower hole, the diameter of the upper hole is larger than that of the lower hole, and the holes in the mesh plate are arranged close to each other. (2) The lift of the spray water pump is 10-15 meters higher than the actual lift. (3) The sum of the cross-sectional areas of the elution nozzles is equal to 65-75% of the cross-sectional area of the outlet of the water pump. (4) The diameter of the spray water separator is determined according to the number of front-end nozzles of the spray water separator, and the spray water separator is changed from thick to thin. (5) The porosity of the lower face of the orifice plate was 38% and the porosity of the upper face was 75%. (6) The diameter of the desulfurization elution tower body is adjusted to ensure that the wind speed in the tower is 2.5 meters per second. (7) Reasonably determining the ratio of the eluent to the smoke. Implementation of SO2And zero clearing is carried out completely, and the spraying power consumption is reduced.
Description
Technical Field
The invention relates to the field of boiler flue gas treatment, in particular to a boiler dual-alkali desulphurization method. Adapted for SO2The reaction with the alkaline substance or in an alkaline solution (wet flue gas desulfurization technique).
Background
In the prior art, the flue gas desulfurization and denitration technology is a boiler flue gas purification technology applied to the chemical industry of generating multiple nitrogen oxides and sulfur oxides. Nitrogen oxides and sulfur oxides are one of the main sources of air pollution. SO in flue gas2Is acidic in nature and can be usedSO removal from flue gases by reaction with appropriate alkaline substances2. The desulfurizing tower utilizes the principle of water film desulfurization and dust removal, and can simultaneously achieve the effects of dust removal and desulfurization (denitrification) by preparing different dust removing agents.
SO removal of boiler waste gas2The limestone method and the double-alkali method are commonly used, the method is mature, and the good removal rate can reach about 90 percent. Limestone processes, because of their relatively low cost, are used relatively much, especially in large boilers operated continuously, which are essentially limestone desulfurization. However, the double alkali method is more suitable for medium and small boilers, particularly for batch operation boilers.
The two-base process is derived from the desulfurization technology of the U.S. general automobile company. Most of domestic desulfurization towers adopting two-to-four-layer nozzles to spray double-alkali eluent to form two-to-four-layer water curtains, boiler waste gas rises upwards from the bottom of the desulfurization tower, and the waste gas passes through the spraying water curtains to complete elution. In practice, the light is far from sufficient by spray elution, and under the impact of the waste gas with the speed of at least two to three meters per second or even higher, a spray water curtain can be curled up and deformed, which cannot be intact, and a part of the waste gas can not contact with the water curtain. The method is one of the reasons that the conventional desulfurizing tower cannot realize zero emission of SO 2.
Disclosure of Invention
The invention aims to provide a boiler dual-alkali desulphurization method with good desulphurization effect to realize SO2And (6) completely clearing.
The technical solution of the invention is as follows: the boiler dual-alkali desulphurization method is characterized by comprising the following steps:
(1) the desulfurization elution tower is internally provided with a multilayer nozzle spraying device, a plurality of layers of mesh plates with a plurality of holes 4 are arranged below the lowest layer of the multilayer nozzle spraying device, the holes on the mesh plates are divided into upper holes and lower holes, and the diameter of the upper part of each upper hole is larger than that of each lower hole.
(2) The lift of the spray water pump is 10-15 meters higher than the actual lift.
(3) The sum of the cross-sectional areas of the elution nozzles is equal to 65-75% of the cross-sectional area of the outlet of the water pump.
(4) The diameter of the spray water separator is determined according to the number of front-end nozzles of the spray water separator, and the spray water separator is changed from thick to thin.
(5) The porosity of the lower face of the orifice plate was 38% and the porosity of the upper face was 75%.
(6) The diameter of the desulfurization elution tower body is adjusted to ensure that the wind speed in the tower is 2.5 meters per second.
In the above-mentioned scheme, the first step of the method,
the upper hole is in an inverted trapezoid shape.
The individual holes in the mesh plate are arranged close to each other.
The invention has the advantages that: 1. the three technical points of 'one-tower two-time elution' and a spraying method and the six technical points of a pore plate method are achieved, in one tower, the uniformly distributed water curtain, water mist and foam play respective roles, SO that one hundred percent of contact between SO2 and NaOH on a molecular layer is ensured, and zero emission of SO2 can be completely realized. Meanwhile, the more sufficient the elution of the process is, the cleaner the smoke dust is removed, the more sufficient the elution is, and the more the VOC in the smoke dust can be removed by the alkaline water solution. The accurate elution technology is adopted to realize SO2And (6) completely clearing. 2. The liquid-gas ratio in the market is reduced from 3 to 1.5, so that the spraying power consumption is reduced by 50%. 3. The multilayer mesh plate with the plurality of holes is arranged, liquid and gas are uniformly distributed in the desulfurizing tower, bubbles are easily formed in spray water and waste gas, the bubbles are broken to enable the waste gas and the spray water to be uniformly mixed, the SO2 and NaOH are guaranteed to be in full contact with each other at the molecular level, elution is sufficient, and zero emission of SO2 can be completely realized.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of the arrangement of mesh plates in the present invention.
Fig. 2 is a schematic view of the planar structure of the mesh plate of the present invention.
Figure 3 is a schematic view of the cell structure of the present invention.
Detailed Description
Referring to fig. 1, 2 and 3, the names of the components are as follows: the device comprises a desulfurization elution tower body 1, a nozzle spray device 2, a mesh plate 3, holes 4, an upper hole 5, a lower hole 6, a spiral nozzle spray eluent inlet 7, a smoke inlet 8, a smoke purification outlet 9 (connected with a chimney) and an eluent outlet 10.
Referring to fig. 1, 2 and 3, the boiler dual-alkali desulfurization method comprises the following steps:
(1) a three-layer nozzle spray device 2 (without limitation) is arranged in a desulfurization elution tower body 1, a three-layer mesh plate 3 (without limitation, see figure 2) with a plurality of holes 4 is arranged below the lowest layer of the three-layer nozzle spray device 2, the holes 4 on the mesh plate 3 are divided into an upper hole 5 and a lower hole 6 (forming a foam concave type mesh plate), the diameter of the upper surface of the upper hole 5 is larger than that of the lower hole 6 (in the embodiment, the diameter of the lower hole 6 is 10mm, the diameter of the upper hole 5 is 14mm, and the upper hole is inverted trapezoid), and the holes on the mesh plate 3 are arranged closely (arranged in an abutting mode, so that water drops are prevented from flowing horizontally on the mesh. The upper eyelet has an inverted trapezoidal shape (see fig. 3).
(2) The lift of the spray water pump is 10-15 meters higher than the actual lift.
(3) The sum of the cross-sectional areas of the elution nozzles is equal to 65-75% of the cross-sectional area of the outlet of the water pump.
(4) The diameter of the spray water separator is determined according to the number of front-end nozzles of the spray water separator, and the spray water separator is changed from thick to thin.
(5) The porosity of the lower face of the orifice plate was 38% and the porosity of the upper face was 75%.
(6) The diameter of the desulfurization elution tower body 1 is adjusted to ensure that the wind speed in the tower is 2.5 meters per second.
Three layers of mesh plates 3 (also called a foam method) are installed below the three layers of elution nozzle spray devices 2 in the desulfurization elution tower body 1. The sprayed eluent flows downwards through the holes of the mesh plate 3, and the waste gas rises upwards through the holes of the mesh plate 3 under the suction force of the induced draft fan at the tail end. The double-alkali liquid is a surfactant, and bubbles are generated when the double-alkali liquid is blown at the holes by exhaust gas. The exhaust gas which runs at high speed is not carried by the bubbles to be still, but rotates in the bubbles at high speed, and SO2 is captured and removed by the bubble water film. The process design actually superposes the elution by the spraying method and the elution by the foaming method of the mesh plate 3, performs 'two times of elution in one tower', only three layers of mesh plates 3 are added, the occupied space is small, and a water pump used for spraying and the eluent sprayed down are utilized without additionally increasing the cost. And the following 'precise' design is realized:
for the spraying method, the technological parameters are as follows: firstly, the spray pump lift will be higher than actual lift 10-15 meters, suitably leaves the surplus (the elbow can increase the helping hand) simultaneously according to spray header elbow quantity, and this lift difference is less, and the pressure before the elution nozzle is less, and the spray water curtain diameter is less, and it is big more to meet the deformation of rolling up on the high-speed flue gas. The lift difference is too large, and the power consumption of the water pump which runs all the year round is too large. Secondly, the sum of the sectional areas of the elution nozzles is equal to 65-75% of the sectional area of the outlet of the water pump, the sectional area difference is less than 65%, the electric energy consumption is too large and exceeds 75%, the diameter of the water curtain is reduced, and the water curtain is easy to curl and deform. Thirdly, the shapes or forms of the spray water distributors can be different, but the diameters of the water distributors are determined according to the number of the front-end nozzles and are changed from thick to thin, so that the same pressure is formed in the spray water distributors, the water sprayed by each nozzle is consistent, and the diameters of water curtains are consistent. The horizontal arrangement pitch of the elution nozzles should be equal, and taking the nozzle of 3/8 as an example, the pitch of the elution nozzles in front, back, left and right cannot be more than 30cm, and the distance from the tower edge cannot be more than 15 cm. The overlap of the water curtain and the water curtain should also be equal. The water curtain is even, and the sinking water mist is also even. The three technical points ensure the sufficiency and the equality of spray elution and reduce the escape probability of the waste gas from the water curtain gap as much as possible.
For the foam method, if the opening ratio is low (such as 30-50%), the aperture is large, the spray water flows to the position below the mesh plate 3 from the periphery of the holes 4, the waste gas rises upwards from the center of the holes 4, bubbles are rarely generated, and only the problem that huge turbulence is generated when the flue gas enters the huge desulfurization tower from one side of the tower bottom can be solved, so that the gas flow is uniformly distributed, and the liquid-gas ratio of elution and the power consumption of a water pump are reduced. If the aperture is a straight hole, the upper pressure and the lower pressure of the mesh plate 3 in the tower are different, the waste gas below the mesh plate 3 escapes through the path of the holes 4, and the mesh plate 3 cannot be installed and welded in an absolute horizontal manner, so that a few holes 4 mainly lift the waste gas, the waste gas flow is high in speed and large in flow, the spray liquid is pushed to other holes 4 by the airflow in a horizontal flow manner, and bubbles are rarely generated; in addition, most of the holes 4 generate bubbles, and the eluent flows out downwards to generate resistance, so that the rising flow speed and flow of the waste gas in the holes 4 are delayed. This phenomenon of liquid-gas not being distributed uniformly is caused by the "jet phenomenon".
In this application, first, the conventional holes with the same upper and lower diameters are changed into concave holes (such as the upper inverted cone table + the lower straight hole) with the upper diameter larger than the lower diameter, and water drops which have fallen on the slope at this time cannot return to the slope and flow out of other holes 4. Second, the diameter of the lower surface of the concave hole 4 is 10mm, the diameter of the upper surface is 14mm, or the diameter of the lower surface is 12mm, the diameter of the upper surface is 16.5mm, and the like, wherein the approximate ratio of the diameter of the lower surface to the diameter of the upper surface is required. Third, the porosity of the lower side of the mesh plate 3 was 38% and the porosity of the upper side was 75% (porosity means the number of pores per unit area). But the cross-sectional area of the exhaust gas through the mesh plate 3 was calculated to still be 38%. On the mesh plate 3, the distance between the holes 4 and the holes 4 is almost zero, water drops can not flow horizontally on the mesh plate 3, and the jet phenomenon loses the most basic condition. Fourthly, according to the fixed waste gas amount, the diameter of the elution tower is adjusted, and the wind speed in the tower is about 2.5 meters per second. The air speed is too fast, the bubbles are fragile, the reaction time of SO2 and eluent is too short, the air speed is too slow, the diameter of the elution tower is too large, the larger the coverage area of the spraying water curtain is, and the larger the power consumption of the water pump is. Fifthly, reasonably determining the liquid-gas (L/m) ratio. The proportion is big more, and the water pump consumption is big more, and the proportion is too little, and the eluant is except that flowing out punchhole 4, and remaining water content can not satisfy the needs that form the bubble water film, will produce and be interrupted out the aerial fog, is interrupted out the phenomenon of bubble. Sixthly, the layout of the elution nozzle and the foam mesh plate 3 is divided into a spraying area and a foam area, namely three layers are sprayed on the upper part, the three layers of mesh plates 3 are arranged on the lower part, and the diameters and the porosities of the holes 4 of the upper, middle and lower mesh plates 3, as well as the waste gas quantity and the waste gas wind speed which pass through the holes 4 are theoretically the same. If the mesh plate 3 adopts a cross layout (spray → mesh plate 3 → spray → mesh plate 3), the disadvantages are: the first layer of mesh plate 3 only receives one layer of sprayed water, the second layer of mesh plate 3 receives two layers of sprayed water, and only the third layer of mesh plate 3 receives three layers of sprayed water. Due to the crossed layout, the upper, middle and lower mesh plates 3 receive different water amounts, different liquid-gas ratios and different bubble amounts, and the uniform liquid-gas distribution is difficult to achieve. And the spraying and the mesh plates 3 are arranged in a crossed manner, the upper part of each layer of mesh plate 3 generating bubbles is close to the spraying, the water curtain is in a spraying manner, and most of the bubbles can be broken when meeting the spraying water curtain. On the contrary, the multilayer sprays together, not only can complement each other to the gap between the water curtain, not only can make the water yield that multilayer mesh plate 3 accepted the same, liquid-gas ratio is the same, the bubble is the same, not only can make multilayer bubble apart from the water curtain some far relatively, and upper mesh plate 3 still has certain effect of sheltering from to the bubble of lower floor mesh plate 3 moreover. The encountered water drops are in a free falling type, no water curtain is directly projected, and the water drops only change large bubbles into a plurality of small bubbles. The bubbles rise to the sprayed water curtain and are broken. According to the arrangement, liquid-gas ratio is 1.5L/m, which is half of the liquid-gas ratio of the existing double-alkali method, and is one tenth of the 15-25L/m high-speed thin-film fruit-stone-lime-gypsum method. Particularly, the limestone method is flood irrigation, but the double-alkali desulfurization method or the limestone-gypsum desulfurization method is adopted, as long as the design of an elution tower has defects, the 'jet phenomenon' is not removed, various parameters are unreasonable, even if the flood irrigation is performed, the desulfurization removal rate can reach about 90%, and zero emission can not be realized. The precise elution technology is not only used in the desulfurization process, but also used continuously in the links of denitration and ozone residue removal.
The field detection result of Jilin province metallurgical research institute on the general-purpose Baixin pharmaceutical industry is as follows (sampling point is located at the boiler outlet-): smoke dust 3.13mg/m3Sulfur dioxide less than 3mg/m3Nitrogen oxides less than 3mg/m3Oxygen content of 19.6 percent and flue gas flow of 9416m3H is used as the reference value. All reach the standard.
The foregoing description is only exemplary of the invention and is not intended to limit the spirit of the invention.
Claims (3)
1. The boiler dual-alkali desulphurization method is characterized by comprising the following steps:
(1) a multilayer nozzle spraying device (2) is arranged in the desulfurization elution tower body (1), a plurality of layers of mesh plates (3) with a plurality of holes (4) are arranged below the lowest layer of the multilayer nozzle spraying device (2), the holes (4) on the mesh plates (3) are divided into upper holes (5) and lower holes (6), and the diameter of the upper surface of each upper hole (5) is larger than that of each lower hole (6);
(2) the lift of the spray water pump is 10-15 meters higher than the actual lift;
(3) the sum of the sectional areas of the elution nozzles is equal to 65-75% of the sectional area of the outlet of the water pump;
(4) the diameter of the spray water separator is determined according to the number of front-end nozzles of the spray water separator, and the spray water separator is changed from thick to thin;
(5) the porosity below the orifice plate is 38%, and the porosity above is 75%;
(6) the diameter of the desulfurization elution tower body (1) is adjusted to ensure that the wind speed in the tower is 2.5 meters per second.
2. The dual alkali desulfurization method for boilers according to claim 1, wherein the upper holes (5) have an inverted trapezoidal shape.
3. A boiler dual alkali desulphurization method according to claim 1 or 2, characterized in that the perforations (4) of the mesh plate (3) are arranged close to each other.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011515591.8A CN112755748A (en) | 2020-12-21 | 2020-12-21 | Boiler dual-alkali desulphurization method |
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| CN202011515591.8A CN112755748A (en) | 2020-12-21 | 2020-12-21 | Boiler dual-alkali desulphurization method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114887425A (en) * | 2022-06-02 | 2022-08-12 | 淮阴工学院 | Anti-blocking washing tower for ash-removing tail gas |
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| CN104399367A (en) * | 2014-11-25 | 2015-03-11 | 西安交通大学 | Smoke washing device with scaling-shaped hole plate |
| CN105749734A (en) * | 2016-04-29 | 2016-07-13 | 中电投远达环保工程有限公司重庆科技分公司 | Self-adaptation boiling-type foam desulfurization dust removal device |
| CN208553717U (en) * | 2018-06-19 | 2019-03-01 | 无锡市华星电力环保工程有限公司 | A kind of absorption tower with novel trunnion pallet |
| CN109499330A (en) * | 2019-01-22 | 2019-03-22 | 浙江遂昌汇金有色金属有限公司 | A kind of tail gas filter |
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2020
- 2020-12-21 CN CN202011515591.8A patent/CN112755748A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201543380U (en) * | 2009-11-02 | 2010-08-11 | 河南蓝森环保科技有限公司 | Efficient wet-type flue gas desulfurization device employing dual-alkali method for industrial coal-fired boiler |
| CN104399367A (en) * | 2014-11-25 | 2015-03-11 | 西安交通大学 | Smoke washing device with scaling-shaped hole plate |
| CN105749734A (en) * | 2016-04-29 | 2016-07-13 | 中电投远达环保工程有限公司重庆科技分公司 | Self-adaptation boiling-type foam desulfurization dust removal device |
| CN208553717U (en) * | 2018-06-19 | 2019-03-01 | 无锡市华星电力环保工程有限公司 | A kind of absorption tower with novel trunnion pallet |
| CN109499330A (en) * | 2019-01-22 | 2019-03-22 | 浙江遂昌汇金有色金属有限公司 | A kind of tail gas filter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114887425A (en) * | 2022-06-02 | 2022-08-12 | 淮阴工学院 | Anti-blocking washing tower for ash-removing tail gas |
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