CN111974177A - Device and method for collecting water and eliminating white smoke in wet desulphurization flue gas - Google Patents
Device and method for collecting water and eliminating white smoke in wet desulphurization flue gas Download PDFInfo
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Abstract
The invention discloses a device and a method for absorbing water and eliminating white smoke by wet-process desulfurization flue gas, which are characterized in that a desulfurization spray layer (4), a gas-lifting liquid-collecting layer (5), a synergistic rectifying layer (6), a condensation spray layer (7), a demisting water-receiving layer (8) and a heater layer (9) are sequentially arranged in a desulfurization tower (1) along the flowing direction of the flue gas, the demisting water-receiving layer (8) is formed by a plurality of blades with different heights in an equidistant and parallel spaced mode, the synergistic rectifying layer (6) is formed by a plurality of rectifier units (6-1), and a plurality of square rectifying grid holes (6-2) are arranged in the rectifier units (6-1). Compared with the prior art, the invention not only can rectify the obliquely moving air flow and spray fog drops to increase the contact area and contact time of the air flow and the spray fog drops, but also can carry out graded demisting on the condensed flue gas, thereby improving the demisting efficiency of the demister, greatly reducing the spaces of a flue gas condensation section and a flue gas demisting drying section, and reducing the investment cost and the operation energy consumption of the flue gas white-removing process.
Description
Technical Field
The invention relates to a device and a method for absorbing water and eliminating white smoke in wet desulphurization flue gas, belonging to the field of atmospheric treatment and environmental protection.
Background
The temperature of the flue gas at the outlet of the wet desulphurization system is 50-55 ℃, the water vapor accounts for 12-18%, and the flue gas is in a saturated or supersaturated state, and a large amount of evaporated water is discharged into the environment in the running process of the wet desulphurization device, so that the flue gas is the main reason for the large water consumption of the wet desulphurization device. The water discharge amount of a 300MW unit wet desulphurization device to the environmental air is over 80 ten thousand tons after one year of operation, which causes a great deal of water resource waste.
In addition, the high-humidity desulfurization tail gas enters the atmosphere, contacts with ambient air with lower temperature for heat exchange, and saturated water vapor is further condensed to generate more obvious white smoke plume. The wet desulphurization flue gas also carries a large amount of undeleted gypsum slurry liquid drops, dust particles and Nitric Oxide (NO)x) Sulfur Oxide (SO)x) And the pollutants are condensed into water mist in the atmospheric environment with higher winter stability and suspended in the atmosphere and are continuously enriched, so that the generation of regional winter haze is promoted.
The electric power development planning in 2005-2020 in China clearly points out the development of water-saving flue gas pollutant control technology suitable for water resource shortage areas. In addition, the discharge of ten pieces of water ensures that the coal-fired power plant faces huge water-saving and emission-reducing pressure, and if a large amount of moisture carried in the wet desulphurization tail gas is recycled, the water consumption of power plant power generation can be reduced, and the phenomena of chimney corrosion and white smoke can be fundamentally solved.
The current common water-collecting and white smoke-eliminating technologies comprise a direct heating method, a mixed air method, an MGGH flue gas heat exchange method and a flue gas condensation reheating method. Wherein the white cigarette technology of going up heat and disappear is carried out the condensation to the desulfurization flue gas earlier to the flue gas of flue gas direct condensation, retrieves moisture in the part flue gas, then heats the intensification to the flue gas, can also retrieve partial water resource when realizing that the flue gas disappears whitely, but the white technology of direct condensation disappears has following difficult problem in the operation process: 1. the condensate water collecting system has the problem of liquid leakage, and the condensate water cannot be collected by the liquid collector completely. Due to the oblique movement of the spray fog drops, part of condensed water can fall into a wet desulphurization slurry pool through the air lifting holes, so that the leakage of a condensation water receiving system is caused, the water balance of the wet desulphurization system is broken, and the desulphurization device can not normally and stably operate. 2. Wet flue gas desulfurization flue gas generates a large amount of tiny fogdrops that condense in the condensation process, and current defroster is carrying out the defogging in-process to this kind of high moisture content flue gas, and a large amount of water droplets that condense form the flooding layer easily in the defroster is inside to cause the condensed liquid body formation secondary atomization phenomenon of accomplishing the entrapment, the great and flue gas defogging drying efficiency of defroster resistance is low, increases the re-heater operation energy consumption. Patent CN 201721593098.1 discloses a white cigarette and condensate recovery unit are disappeared in wet flue gas flue heat transfer, adopt the indirect cooling condensation reheat technique of flue gas, carry out the heat transfer through outside of tubes high temperature flue gas and intraductal recirculated cooling water, the liquid drop in the flue gas is caught to rethread defogging section, heats up to the wet flue gas heating of saturation through high temperature steam at last, but this scheme heat exchange efficiency is low, and the vapor condensation volume is little, and the recirculated cooling water volume of needs is great. Patent CN201710534492.6 discloses a high-efficient baffling board-like defroster, the interval has set up a plurality of water catch bowl on the baffling board, the water catch bowl extends along baffling blade's width direction, at the in-process that the flue gas flows from bottom to top, the flue gas contacts with the blade, the flue gas contains the less droplet of diameter and flows to the water catch bowl along network structure fast in, has good defogging effect, nevertheless when the flue gas velocity of flow is too high, can not avoid defroster droplet "secondary to smuggle secretly" phenomenon.
Therefore, the invention provides a device and a method for collecting water and eliminating white smoke in wet desulphurization flue gas.
Disclosure of Invention
The invention aims to provide a device and a method for collecting water and eliminating white smoke in wet desulphurization flue gas, which can rectify obliquely moving air flow and spray fog drops, increase the contact area and contact time of the air flow and the spray fog drops, improve the air-liquid heat exchange efficiency, and carry out graded demisting on condensed flue gas, improve the demisting efficiency of a demister, greatly reduce the space of a flue gas condensation section and a flue gas demisting drying section, and reduce the investment cost and the operation energy consumption of a flue gas white elimination process.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a device for collecting water and eliminating white smoke by wet desulphurization flue gas comprises a desulphurization tower (1) and a cooling tower (2), wherein the desulphurization tower is provided with a gas inlet (3) and a gas outlet (10), and is characterized in that a desulphurization spray layer (4), a gas-lifting liquid-collecting layer (5), a synergistic rectifying layer (6), a condensation spray layer (7), a demisting water-collecting layer (8) and a heater layer (9) are sequentially arranged between the gas inlet (3) and the gas outlet (10) in the desulphurization tower (1) along the flowing direction of the flue gas, the demisting water-collecting layer (8) is formed by a plurality of blades with different heights in an equidistant parallel interval manner, the blades are folding metal sheets, each blade comprises a blade A (8-1) and a blade B (8-2), the height of the blade A (8-1) is greater than that of the blade B (8-2), and the edge of a lower end plate body of the blade A (8-1) is arranged into a sawtooth shape, the plate body at the lower end of the blade B (8-2) is rectangular, the synergistic rectifying layer (6) is composed of a plurality of rectifier units (6-1), and a plurality of square rectifying grid holes (6-2) are formed in the rectifier units (6-1).
The desulfurization sprays layer (4) and comprises shower and a plurality of nozzle, sets up a plurality of layers of desulfurization in wet flue gas desulfurization tower (1) and sprays layer (4), and the flue gas lets in from air inlet (3) of desulfurizing tower (1), and withThe circulating desulfurization liquid is in reverse contact, and the desulfurization liquid is sprayed out through a nozzle and is fully contacted with the flue gas flowing in the reverse direction to remove SO in the flue gas2And the by-product calcium sulfite is oxidized to generate calcium sulfate dihydrate.
The gas-lifting liquid collecting layer (5) is located above the desulfurization spraying layer (4) and used for circulating flue gas and collecting condensate generated by condensing and cooling vapor in circulating cooling liquid and flue gas, the condensate is discharged out of the desulfurization tower (1) by collecting liquid, the gas-lifting liquid collecting layer (5) is composed of a plurality of layers of liquid collectors, a plurality of liquid collecting grooves (5-1) are arranged in each layer of liquid collector at equal intervals, a gap part between every two adjacent liquid collecting grooves (5-1) is an airflow ascending channel, and the liquid collecting grooves (5-1) are used for collecting the circulating cooling liquid and the condensate.
Furthermore, at least two layers of liquid collectors are arranged on the gas lifting liquid collecting layer (5), the distance between adjacent liquid collecting grooves (5-1) in each layer of liquid collector is 100-300 mm, the width of each liquid collecting groove (5-1) is 200-300 mm, and the length of each liquid collecting groove (5-1) is 1.0-3.0 m;
the synergistic rectifying layer (6) is positioned above the gas-lifting liquid collecting layer (5) and used for collecting and rectifying circulating cooling liquid fog drops which are sprayed out of the condensation spraying layer (7) and move obliquely, so that the oblique fog drops are prevented from passing through the gap of the gas-lifting liquid collecting layer (5) to cause liquid leakage of the gas-lifting liquid collecting layer (5), the contact area and the contact time of flue gas and cooling liquid are increased, and the gas-liquid heat exchange effect is enhanced. The synergistic rectifying layer (6) is composed of a plurality of rectifier units (6-1), and a plurality of square grid holes (6-2) are arranged in each rectifier unit (6-1) and are used for rectifying condensed liquid drops and flue gas and exchanging heat to enhance efficiency.
Furthermore, the lower end of the synergistic rectifying layer (6) is 0.5-1.0 m away from the gas rising and liquid collecting layer, the section of each rectifier unit (6-1) is square, the side length is 0.5-1.5 m, the side length of each rectifying grid hole (6-2) is 20-80 mm, and the height of the synergistic rectifying layer (6) is 100-500 mm;
the condensation spraying layer (7) is positioned above the synergistic rectifying layer (6) and is used for atomizing and spraying the circulating cooling liquid, and the condensation spraying layer consists of a spraying main pipe and a plurality of atomizing nozzles.
Furthermore, the distance between the upper end of the synergistic rectifying layer (6) and the condensing spraying layer (7) is 0.3-1.0 m;
and the demisting and water collecting layer (8) is positioned above the condensation spraying layer (7) and is used for demisting and drying the condensed flue gas after condensation cooling and recovering condensed water generated in the condensation cooling process.
Furthermore, the height of the demisting and water collecting layer (8) from the condensation spraying layer (7) is 0.3-1.2 m, the height of the demisting and water collecting layer (8) is 0.1-0.3 m, the distance between every two adjacent blades A (8-1) or B (8-2) is 10-40 mm, the distance between every two adjacent blades A (8-1) and B (8-2) is 5-20 mm, and the height of the sawtooth-shaped part is 30-60 mm.
And the heater layer (9) is positioned above the demisting and water collecting layer (8) and is used for heating and warming the flue gas after deep condensation water collection and demisting drying are completed. Most of pollutants and gaseous water in the flue gas are removed, the specific heat of the flue gas is greatly reduced, the temperature of the flue gas is quickly raised after the flue gas passes through the heater layer (9), and unsaturated emission of the heated flue gas is realized, so that the phenomenon of white smoke is eliminated. Because the front-end demister has good water-collecting and drying effects, the moisture content of the flue gas is greatly reduced, and the reheating energy consumption required by the flue gas heating section can be fully reduced.
Furthermore, the height of the heater layer (9) from the demisting and water collecting layer (8) is 0.3-1.5 m, the height of the heater is 0.3-1.5 m, and the temperature rise amplitude of the flue gas is 5-40 ℃.
A method for collecting water and eliminating white smoke in wet flue gas desulfurization is implemented by using the device, and specifically comprises the following steps:
a. the flue gas enters a desulfurizing tower (1) and is washed by a desulfurizing spray layer (4) to remove particulate matters and SO in the flue gas2The high-temperature flue gas and the desulfurization spraying liquid finish heat exchange and reach a saturated state;
b. the desulfurized saturated wet flue gas rises and passes through the gas-lifting liquid-collecting layer (5) and then enters the cooling and condensing section for cooling and condensing, the obliquely moving circulating cooling liquid downwards passes through the synergistic rectifying layer (6) and falls into the gas-lifting liquid-collecting layer (5) along the vertical direction after being rectified, the upwardly moving high-temperature saturated wet flue gas is uniformly rectified by the synergistic rectifying layer (6), the low-temperature condensed spray liquid is contacted with the surface of the synergistic rectifying layer (6) for heat exchange to complete condensation, the temperature of saturated flue gas is reduced by 5-20 ℃, circulating cooling liquid for completing condensation heat exchange and condensation liquid generated by condensing and cooling vapor in the flue gas are collected by the gas rising liquid collecting layer (5), discharged out of the desulfurizing tower (1) and sent to the cooling tower (2) for cooling, and the circulating condensation liquid is sent to the condensation spraying layer (7) for recycling after heat exchange and cooling are carried out in the cooling tower (2) for 10-20 ℃;
c. The flue gas after cooling and condensation carries a large amount of fine condensed water drops to rise into a demisting and water collecting layer (8), the fine condensed water drops collide with the surface of the metal blade and are collected, and the collected large amount of condensed water drops are quickly drained and discharged from the sawtooth tips below the blade A (8-1) for recycling after being enriched on the surface of the metal blade;
d. the dried flue gas after condensation and demisting is upwards heated to an unsaturated state through the heater layer (9) and then discharged, the temperature rise amplitude of the flue gas is 5-40 ℃, and water and white smoke are collected and eliminated.
Further, the liquid-gas ratio of the desulfurization spraying layer (4) is 10-20L/Nm3The coverage rate of the desulfurization spraying layer (4) is 200-400%, and the spraying liquid-gas ratio of the condensation spraying layer (7) is 0.5-5.0L/Nm3。
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a solution for efficiently condensing desulfurized wet flue gas to receive water, and the synergistic rectifying layer is arranged below the condensing spraying layer, so that the problem that liquid leakage is caused by the fact that obliquely cooled fog drops sprayed out by nozzles of the condensing spraying layer pass through gaps of the gas-raising and liquid-collecting layer can be effectively avoided, the gas-liquid heat exchange area and the heat exchange time in the flue gas condensing process can be improved, the gas-liquid enhanced heat exchange is realized, the circulating amount of condensed liquid and the gas-liquid heat exchange space can be greatly reduced, and the operation energy consumption in the flue gas condensing and cooling process can be saved.
2. The invention provides a solution for efficiently trapping condensed liquid drops in wet flue gas, which effectively increases the blade interval at the lower end of a demister by utilizing equidistant arrangement of demister blades with different heights, quickly drains the trapped condensed liquid by utilizing a toothed tip part at the lower end of a higher demister blade, prevents the condensed liquid drops from being enriched at the lower end of the demister and reducing airflow channels among the blades to cause overhigh air speed so as to form secondary atomization of the condensed liquid, reduces the blade interval of the demister at the upper end of the demister to improve the collision probability of the demister blades on fine liquid drops, greatly improves the demisting water-receiving efficiency of the demister by two-stage demisting and quick drainage of the condensed liquid, and realizes the efficient recovery of condensed water.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a demisting and water-collecting layer according to the present invention;
FIG. 3 is a schematic structural diagram of a vane A of a water collecting layer of a demister in the invention;
FIG. 4 is a side view of FIG. 3;
FIG. 5 is a schematic structural diagram of a vane B of a water collecting layer of a demister according to the present invention;
FIG. 6 is a side view of FIG. 5;
FIG. 7 is an enlarged fragmentary schematic view of the sump of the present invention;
fig. 8 is a schematic diagram of the structure of the rectifier unit of the present invention.
Shown in the figure: the device comprises a desulfurizing tower 1, a cooling tower 2, a gas inlet 3, a desulfurizing spray layer 4, a gas-raising liquid-collecting layer 5, a liquid-collecting tank 5-1, a synergistic rectifying layer 6, a rectifier unit 6-1, rectifying grid holes 6-2, a condensing spray layer 7, a demisting water-collecting layer 8, a blade A8-1, a blade B8-2, a heater layer 9, a gas outlet 10 and a cooling liquid circulating pump 11.
Detailed Description
Preferred embodiments of the present invention are described in detail below.
Example 1: referring to fig. 1 to 8, which are schematic structural views of embodiment 1 of the present invention,
a device for collecting water and eliminating white smoke by wet desulphurization flue gas comprises a desulphurization tower 1 and a cooling tower 2, wherein a gas inlet 3 and a gas outlet 10 are arranged on the desulphurization tower, a desulphurization spray layer 4, a gas-lifting liquid-collecting layer 5, a synergistic rectifying layer 6, a condensation spray layer 7, a demisting water-collecting layer 8 and a heater layer 9 are sequentially arranged between the gas inlet 3 and the gas outlet 10 in the desulphurization tower 1 along the flowing direction of the flue gas, the demisting water-collecting layer 8 is formed by a plurality of blades with different heights in parallel at intervals, the blades are folding metal sheets, the blades comprise a blade A8-1 and a blade B8-2, the height of the blade A8-1 is greater than that of the blade B8-2, the edge of a plate body at the lower end of the blade A8-1 is set to be a sawtooth shape, the plate body at the lower end of the blade B8-2 is rectangular, and the synergistic rectifying layer 6 is formed by, a plurality of square rectifying grating holes 6-2 are arranged in the rectifier unit 6-1.
The gas-raising liquid collecting layer 5 is located above the desulfurization spraying layer 4 and used for circulating flue gas, collecting condensate generated by condensing and cooling water vapor in circulating cooling liquid and flue gas and discharging the collected liquid out of the desulfurization tower 1, the gas-raising liquid collecting layer 5 is composed of a plurality of layers of liquid collectors, a plurality of liquid collecting grooves 5-1 are arranged in each layer of liquid collector at equal intervals, a gap part between every two adjacent liquid collecting grooves 5-1 is an airflow ascending channel, and the liquid collecting grooves 5-1 are used for collecting the circulating cooling liquid and the condensate.
The gas-lifting liquid collecting layer 5 is at least provided with two layers of liquid collectors, the distance between every two adjacent liquid collecting grooves 5-1 in each layer of liquid collector is 100-300 mm, the width of each liquid collecting groove 5-1 is 200-300 mm, and the length of each liquid collecting groove 5-1 is 1.0-3.0 m;
the synergistic rectifying layer 6 is positioned above the gas-lifting liquid collecting layer 5 and used for collecting and rectifying circulating cooling liquid fog drops which are sprayed out from the condensation spraying layer 7 and move obliquely, so that the oblique fog drops are prevented from passing through the gap of the gas-lifting liquid collecting layer 5 to cause liquid leakage of the gas-lifting liquid collecting layer 5, the contact area and the contact time of flue gas and cooling liquid are increased, and the gas-liquid heat exchange effect is enhanced. The synergistic rectifying layer 6 consists of a plurality of rectifier units 6-1, and a plurality of square grid holes 6-2 are arranged in each rectifier unit 6-1 and used for rectifying condensed liquid drops and flue gas and exchanging heat to enhance efficiency.
The lower end of the synergistic rectifying layer 6 is 0.5-1.0 m away from the gas-lifting liquid-collecting layer, the section of each rectifier unit 6-1 is square, the side length is 0.5-1.5 m, the side length of each rectifying grid hole 6-2 is 20-80 mm, and the height of the synergistic rectifying layer 6 is 100-500 mm;
the condensation spraying layer 7 is positioned above the synergistic rectifying layer 6, is used for atomizing and spraying the circulating cooling liquid and consists of a spraying main pipe and a plurality of atomizing nozzles.
The distance between the upper end of the synergistic rectifying layer 6 and the condensation spraying layer is 70.3m-1.0 m;
and the demisting and water collecting layer 8 is positioned above the condensation spraying layer 7 and is used for demisting and drying the condensed flue gas after condensation cooling and recovering condensed water generated in the condensation cooling process.
The height of the demisting water-collecting layer 8 from the condensation spraying layer 7 is 0.3-1.2 m, the height of the demisting water-collecting layer 8 is 0.1-0.3 m, the distance between the adjacent blade A8-1 or the adjacent blade B8-2 is 10-40 mm, the distance between the adjacent blade A8-1 and the blade B8-2 is 5-20 mm, and the height of the sawtooth-shaped part is 30-60 mm.
And the heater layer 9 is positioned above the demisting and water collecting layer 8 and used for heating and warming flue gas after deep condensation water collection and demisting drying are completed. Most of pollutants and gaseous water in the flue gas are removed, the specific heat of the flue gas is greatly reduced, the temperature of the flue gas is quickly raised after the flue gas passes through the heater layer 9, unsaturated emission of the heated flue gas is achieved, and therefore the phenomenon of white smoke is eliminated. Because the front-end demister has good water-collecting and drying effects, the moisture content of the flue gas is greatly reduced, and the reheating energy consumption required by the flue gas heating section can be fully reduced.
The height of the heater layer 9 from the demisting and water collecting layer 8 is 0.3m to 1.5m, the height of the heater is 0.3m to 1.5m, and the temperature rise amplitude of the flue gas is 5 ℃ to 40 ℃.
In actual use: after the original flue gas is treated by the wet desulphurization spraying layer 4, the particles and SO in the flue gas2And (4) removing the flue gas, and performing spray cooling on the high-temperature flue gas and wet desulphurization to finish heat exchange and reach a saturated state. The saturated clean flue gas after the completion of desulfurization continues to rise, and clean flue gas enters the cooling condensation section for cooling condensation after passing through the gas rising liquid collecting layer 5 in the rising process, and the cooling condensation section is internally provided with the efficiency-increasing rectifying layer 6 and the condensation spraying layer 7, and the efficiency-increasing rectifying layer 6 is positioned in the condensation spraying layerBelow layer 7. In the cooling condensation section, low-temperature condensate is atomized into fine droplets through the condensation spray layer 7 and flows downwards under the action of gravity, the atomized fine droplets moving obliquely collide with the wall surface of the synergistic rectification layer 6 and are trapped when passing through the synergistic rectification layer 6, the fine droplets flow downwards under the action of gravity after being enriched on the wall surface of the synergistic rectification layer 6 to form a liquid film, and finally the fine droplets leave the bottom of the synergistic rectification layer 6 along the vertical direction and fall into the gas-lifting liquid-collecting layer 5. The high-temperature air flow passing through the gas lifting liquid collecting layer 5 flows upwards in the cooling condensing section to exchange heat with the low-temperature condensate for cooling, when the obliquely moving air flow passes through the synergistic rectifying layer 6, the air flow is rectified uniformly by the rectifier, the gaseous water vapor in the flue gas is condensed in the heat exchange and cooling process to generate a large amount of fine liquid condensate droplets, the large-particle-size condensate droplets flow downwards under the action of gravity and finally enter the gas lifting liquid collecting layer 5, and the fine condensate droplets continuously rise along with the air flow.
The flue gas that accomplishes the cooling condensation carries a large amount of tiny condensate water droplets to continue to rise and gets into defogging receipts water layer 8, set up the defogging receipts water collector of compriseing a plurality of equidistant metal folding blade in defogging receipts water layer 8, the flue gas is passing the in-process that defogging received water layer 8 with a large amount of tiny condensate water droplets, under the inertial action, tiny condensate water droplets collide with the metal blade surface of defogging receipts water collector and by defroster surface entrapment, a large amount of tiny condensate water droplets that are caught form the liquid film at the defroster and flow downwards under the action of gravity and leave the defroster lower extreme along vertical direction, finally get into gas lift liquid collecting layer 5 outside liquid collector discharge tower. In order to prevent condensate from being secondarily atomized due to the fact that the air speed between blades at the lower end of the demister is high due to the fact that the amount of condensate at the bottom of the demister is too large and a liquid film layer is too thick, the blades of the demister are arranged at equal intervals by two kinds of blades with different heights, namely a blade A8-1 and a blade B8-2, the lower portion of the blade A8-1 with the higher height is in a sawtooth shape, and the lower portion of the blade B8-2 with the lower height is in a rectangular. After the enrichment of a large amount of condensed water drops collected by the demister is completed, the large amount of condensed water is quickly drained out of the bottom of the demister through the sawtooth tips below the higher demister blades, namely the blades A8-1.
The condensed and demisted flue gas continuously flows upwards through the heater layer 9, and is discharged into the atmosphere after being reheated and heated by the heater layer 9 to reach an unsaturated state, so that the white smoke in the wet desulphurization tail gas is eliminated. The steam content in the condensed and demisted flue gas is greatly reduced, the specific heat of the flue gas is reduced, and the heat exchange area and the operation energy consumption of the heater layer 9 are greatly reduced. The cooling condensate and the condensed water are discharged out of the tower by a liquid collector of the gas-lifting liquid-collecting layer 5, one part of the cooling condensate and the condensed water enters the cooling tower 2 for cooling and then is used as cooling liquid for recycling, and the other part of the cooling condensate and the condensed water is discharged into the wet desulphurization pulping system and is used as supplementary water of the wet desulphurization system to save the water consumption of the desulphurization system.
Example 2: a method for removing white smoke by wet desulphurization flue gas water collection specifically comprises the following steps:
a. after entering the desulfurizing tower 1, the flue gas is washed by the desulfurizing spray layer 4 to remove particulate matters and SO in the flue gas2The high-temperature flue gas and the desulfurization spraying liquid finish heat exchange and reach a saturated state;
the liquid-gas ratio of the desulfurization spraying layer 4 is 10-20L/Nm3The coverage rate of the desulfurization spraying layer 4 is 200-400%;
b. the desulfurized saturated wet flue gas rises to pass through the gas rising and liquid collecting layer 5 and then enters the cooling and condensing section for cooling and condensing, the efficiency-enhancing rectifying layer 6 and the condensing and spraying layer 7 are arranged in the cooling and condensing section, the efficiency-enhancing rectifying layer 6 is positioned below the condensing and spraying layer 7, in the cooling and condensing section, low-temperature condensate is atomized into fine droplets by the condensing and spraying layer 7 and flows downwards under the action of gravity, atomized and obliquely moved circulating cooling liquid collides with the wall surface of the efficiency-enhancing rectifying layer 6 and is trapped when downwards passing through the efficiency-enhancing rectifying layer 6, liquid films are formed by the wall surface enrichment of the efficiency-enhancing rectifying layer 6 and then flow downwards under the action of gravity, finally the liquid droplets fall into the gas rising and liquid collecting layer 5 in the vertical direction, the upwardly moved high-temperature saturated wet flue gas is uniformly rectified by the efficiency-enhancing rectifying layer 6 and is contacted with the low-temperature condensing and spraying liquid on the surface of the efficiency-enhancing rectifying layer 6 for heat exchange to finish, circulating cooling liquid for completing condensation heat exchange and condensation liquid generated by condensing and cooling vapor in flue gas are collected by the gas rising liquid collecting layer 5, discharged out of the desulfurizing tower 1 and sent to the cooling tower 2 for cooling, and the circulating cooling liquid is sent to the condensation spraying layer 7 for recycling by the cooling liquid circulating pump 11 after heat exchange and cooling are carried out in the cooling tower 2 for 10-20 ℃;
The spraying liquid-gas ratio of the condensation spraying layer 7 is 0.5-5.0L/Nm3。
c. The flue gas that accomplishes the cooling condensation carries a large amount of tiny condensate water droplets to continue to rise and gets into defogging receipts water layer 8, set up the defogging receipts water collector of compriseing a plurality of equidistant metal folding blade in defogging receipts water layer 8, the flue gas is passing the in-process that defogging received water layer 8 with a large amount of tiny condensate water droplets, under the inertial action, tiny condensate water droplets collide with the metal blade surface of defogging receipts water collector and by defroster surface entrapment, a large amount of tiny condensate water droplets that are caught form the liquid film at the defroster and flow downwards under the action of gravity and leave the defroster lower extreme along vertical direction, finally get into gas lift liquid collecting layer 5 outside liquid collector discharge tower. In order to prevent condensate from being secondarily atomized due to the fact that the air speed between blades at the lower end of the demister is high due to the fact that the amount of condensate at the bottom of the demister is too large and a liquid film layer is too thick, the blades of the demister are arranged at equal intervals by two kinds of blades with different heights, namely a blade A8-1 and a blade B8-2, the lower portion of the blade A8-1 with the higher height is in a sawtooth shape, and the lower portion of the blade B8-2 with the lower height is in a rectangular. After the enrichment of a large amount of condensed water drops collected by the demister is finished, quickly draining the large amount of condensed water out of the bottom of the demister through saw-tooth tips below higher demister blades, namely the blades A8-1;
d. The dried flue gas after condensation and demisting flows upwards, is heated to an unsaturated state through the heater layer 9 and then is discharged, and enters the atmosphere to realize the white smoke elimination of the wet desulphurization tail gas. The steam content in the condensed and demisted flue gas is greatly reduced, the specific heat of the flue gas is reduced, and the heat exchange area and the operation energy consumption of the heater layer 9 are greatly reduced. The cooling condensate and the condensed water are discharged out of the tower by a liquid collector of the gas-lifting liquid-collecting layer 5, one part of the cooling condensate and the condensed water enters the cooling tower 2 for cooling and then is used as cooling liquid for recycling, and the other part of the cooling condensate and the condensed water is discharged into the wet desulphurization pulping system and is used as supplementary water of the wet desulphurization system to save the water consumption of the desulphurization system. The temperature rise amplitude of the smoke is 5-40 ℃, and water collection and white smoke elimination are realized.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (9)
1. A device for collecting water and eliminating white smoke by wet desulphurization flue gas comprises a desulphurization tower (1) and a cooling tower (2), wherein the desulphurization tower is provided with a gas inlet (3) and a gas outlet (10), and is characterized in that a desulphurization spray layer (4), a gas-lifting liquid-collecting layer (5), a synergistic rectifying layer (6), a condensation spray layer (7), a demisting water-collecting layer (8) and a heater layer (9) are sequentially arranged between the gas inlet (3) and the gas outlet (10) in the desulphurization tower (1) along the flowing direction of the flue gas, the demisting water-collecting layer (8) is formed by a plurality of blades with different heights in an equidistant parallel interval manner, the blades are folding metal sheets, each blade comprises a blade A (8-1) and a blade B (8-2), the height of the blade A (8-1) is greater than that of the blade B (8-2), and the plate body at the lower end of the blade A (8-1) is provided with a saw, the plate body at the lower end of the blade B (8-2) is rectangular, the synergistic rectifying layer (6) is composed of a plurality of rectifier units (6-1), and a plurality of square rectifying grid holes (6-2) are formed in the rectifier units (6-1).
2. The wet desulphurization flue gas water-collecting and white smoke-eliminating device according to claim 1, wherein the height of the demisting water-collecting layer (8) from the condensation spray layer (7) is 0.3-1.2 m, the height of the demisting water-collecting layer (8) is 0.1-0.3 m, the distance between the adjacent blades A (8-1) or B (8-2) is 10-40 mm, the distance between the adjacent blades A (8-1) and B (8-2) is 5-20 mm, and the height of the serrated part is 30-60 mm.
3. The device for collecting water and eliminating white smoke in wet flue gas desulfurization according to claim 1 or 2, wherein the synergistic rectifying layer (6) is located above the lift gas liquid collecting layer (5), the condensation spraying layer (7) is located below, the upper end of the synergistic rectifying layer (6) is 0.3-1.0 m away from the condensation spraying layer, the lower end of the synergistic rectifying layer (6) is 0.5-1.0 m away from the lift gas liquid collecting layer, the height of the synergistic rectifying layer (6) is 100-500 mm, the cross section of the rectifier unit (6-1) is square, the side length is 0.5-1.5 m, and the side length of the rectifying grid holes (6-2) is 20-80 mm.
4. The device for collecting water and eliminating white smoke in wet desulphurization flue gas according to claim 1 or 2, wherein the gas-lift liquid collecting layer (5) is located above the desulphurization spraying layer (4) and below the synergistic rectification layer (6), the gas-lift liquid collecting layer (5) is composed of a plurality of layers of liquid collectors, each layer of liquid collector comprises a plurality of liquid collecting tanks (5-1) which are arranged at equal intervals, the liquid collecting tanks (5-1) are connected with the cooling tower (2) through pipelines, and the outlet of the cooling tower (2) is connected with the inlet of the condensation spraying layer (7) through a cooling liquid circulating pump (11).
5. The wet desulphurization flue gas water-collection and white smoke-elimination device according to claim 4, wherein the lift gas liquid-collection layer (5) is provided with at least two layers of liquid collectors, the distance between adjacent liquid-collection grooves (5-1) in the liquid collectors is 100-300 mm, the width of the liquid-collection groove (5-1) is 200-400 mm, and the length of the liquid-collection groove is 1.0-3.0 m.
6. The device for absorbing water and eliminating white smoke in wet flue gas desulfurization according to claim 1 or 2, wherein the gas-raising liquid-collecting layer (5) is communicated with the upper part of the cooling tower (2) through a pipeline, and the water outlet of the cooling tower (2) is communicated with the circulating cooling liquid inlet of the condensation spraying layer (7) through a cooling liquid circulating pump (11).
7. The wet desulphurization flue gas water-collecting and white smoke-eliminating device according to claim 1 or 2, wherein the heater layer (9) is located above the demisting water-collecting layer (8), the height of the heater layer (9) from the demisting water-collecting layer (8) is 0.3 m-1.5 m, and the height of the heater layer (9) is 0.3 m-1.5 m.
8. A method for water collection and white smoke elimination of wet flue gas desulfurization, which is characterized in that the device of claims 1-7 is used for water collection and white smoke elimination of wet flue gas desulfurization, and comprises the following steps:
a. the flue gas enters a desulfurizing tower (1) and is washed by a desulfurizing spray layer (4) to remove particulate matters and SO in the flue gas 2The high-temperature flue gas and the desulfurization spray liquid finish heat exchange and reach a saturated stateState;
b. the desulfurized saturated wet flue gas rises and passes through the gas-lifting liquid-collecting layer (5) and then enters the cooling and condensing section for cooling and condensing, the obliquely moving circulating cooling liquid downwards passes through the synergistic rectifying layer (6) and falls into the gas-lifting liquid-collecting layer (5) along the vertical direction after being rectified, the upwardly moving high-temperature saturated wet flue gas is uniformly rectified by the synergistic rectifying layer (6), the low-temperature condensed spray liquid is contacted with the surface of the synergistic rectifying layer (6) for heat exchange to complete condensation, the temperature of saturated flue gas is reduced by 5-20 ℃, circulating cooling liquid for completing condensation heat exchange and condensation liquid generated by condensing and cooling vapor in the flue gas are collected by the gas rising liquid collecting layer (5), discharged out of the desulfurizing tower (1) and sent to the cooling tower (2) for cooling, and the circulating condensation liquid is sent to the condensation spraying layer (7) for recycling after heat exchange and cooling are carried out in the cooling tower (2) for 10-20 ℃;
c. the flue gas after cooling and condensation carries a large amount of fine condensed water drops to rise into a demisting and water collecting layer (8), the fine condensed water drops collide with the surface of the metal blade and are collected, and the collected large amount of condensed water drops are quickly drained and discharged from the sawtooth tips below the blade A (8-1) for recycling after being enriched on the surface of the metal blade;
d. The dried flue gas after condensation and demisting is upwards heated to an unsaturated state through the heater layer (9) and then discharged, the temperature rise amplitude of the flue gas is 5-40 ℃, and water and white smoke are collected and eliminated.
9. The method for collecting water and eliminating white smoke in wet desulphurization flue gas according to claim 8, wherein the liquid-gas ratio of the desulphurization spray layer (4) is 10-20L/Nm3The coverage rate of the desulfurization spraying layer (4) is 200-400%, and the spraying liquid-gas ratio of the condensation spraying layer (7) is 0.5-5.0L/Nm3。
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| CN112742183A (en) * | 2021-01-04 | 2021-05-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Flue gas desulfurization absorption system and process thereof |
| CN112742178A (en) * | 2021-01-04 | 2021-05-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Flue gas desulfurization and SCR denitration combined system and flue gas treatment process |
| CN112774421A (en) * | 2021-01-04 | 2021-05-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Wet flue gas desulfurization and denitrification system and process |
| CN113101779A (en) * | 2021-04-14 | 2021-07-13 | 浙江理工大学 | System and method for purifying industrial flue gas containing sulfur and dust |
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