CN111265983A - Two-section binary flue gas treatment system - Google Patents
Two-section binary flue gas treatment system Download PDFInfo
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- CN111265983A CN111265983A CN202010220327.5A CN202010220327A CN111265983A CN 111265983 A CN111265983 A CN 111265983A CN 202010220327 A CN202010220327 A CN 202010220327A CN 111265983 A CN111265983 A CN 111265983A
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- B01D—SEPARATION
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- 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
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
- B01D53/52—Hydrogen sulfide
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
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- B01D53/34—Chemical or biological purification of waste gases
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- B01D2251/304—Alkali metal compounds of sodium
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- B01D2258/0283—Flue gases
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Abstract
The invention discloses a two-section binary flue gas treatment system, which comprises: heat exchange equipment; a dust removal device; the desulfurizing tower comprises a first tower body, a first flue gas uniform distribution device and a first spraying device, wherein the first tower body consists of a first main body, a first diameter expanding section and a first lower part; the first flue gas uniform distribution device comprises a first upper tray body and a first lower tray body, a plurality of first air injection columns are arranged on the top wall of the first upper tray body in a protruding mode, and extension lines of the first air injection columns on the outermost ring are converged on the axis of the first tower body and converged outside the first tower body; an absorption tower. The invention organically combines the binary removal technology, greatly reduces the environmental protection operation cost and really realizes the clean, environmental protection and energy saving continuous operation. The invention improves the structures of the desulfurizing tower and the absorption tower, improves the first flue gas uniform distribution device in the desulfurizing tower and the second flue gas uniform distribution device in the absorption tower, and improves the desulfurizing efficiency of the desulfurizing tower and the absorption tower.
Description
Technical Field
The invention relates to the technical field of rotary kiln tail gas treatment, in particular to a two-section binary flue gas treatment system.
Background
The untreated tail gas of the rotary kiln mainly comprises SO2, H2S, NOx, NH3, sulfuric acid mist, dust and the like. The contents of SO2 and H2S in the waste water are far beyond the national emission standard, and the waste water is seriously polluted, SO the waste water must be treated and discharged after meeting the environmental protection emission standard. At present, a desulfurizing tower and an absorption tower are often adopted to remove sulfur dioxide and hydrogen sulfide contained in tail gas, however, the removal efficiency of the existing desulfurizing tower and the existing absorption tower still needs to be improved, and further, the flue gas treatment effect of the whole flue gas treatment system still has a point of improvement.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
The invention aims to provide a two-section binary flue gas treatment system which can improve the efficiency of flue gas desulfurization, organically combine binary removal technologies, greatly reduce the cost of environment-friendly operation and really realize clean, environment-friendly and energy-saving continuous operation.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a two-stage binary flue gas treatment system comprising:
heat exchange equipment;
the dust removing device is positioned on the downstream side of the heat exchange device and is connected with the heat exchange device;
the desulfurizing tower comprises a first tower body, a first flue gas uniform distribution device and a first spraying device, wherein the first tower body comprises a first main body, a first diameter expansion section and a first lower part, and the first main body is connected to the first lower part through the first diameter expansion section; the first spraying device is arranged at the top of the first main body, and the liquid inlet end of the first spraying device is connected to a desulfurization liquid circulating pool which is arranged outside the desulfurization tower and contains sodium sulfide desulfurization liquid; a first flue gas outlet is formed in the top of the first main body, a first flue gas inlet is formed in the side wall of the first lower portion, the first flue gas inlet is connected to the dust removing equipment, and a first liquid discharging port is formed in the bottom of the first lower portion; the first flue gas uniform distribution device is arranged in the first lower part and comprises a first upper tray body and a first lower tray body, the first upper tray body and the first lower tray body are both of circular disc structures with hollow cavities inside and are coaxially arranged with the first tower body, the circle centers of the first upper tray body and the first lower tray body are connected through a first vertical pipe so as to communicate the hollow cavities of the first upper tray body and the first lower tray body with each other, the circumferential side wall of the first lower tray body is connected with the first flue gas inlet through a first horizontal pipe so as to communicate the hollow cavities of the first lower tray body with the first flue gas inlet, the circumferential side wall of the first lower tray body and the side wall of the first lower part are separated from each other by a certain distance, and the circumferential side wall of the first upper tray body and the side wall of the first lower part are separated from each other by a certain distance, the top wall of the first upper tray body is provided with a plurality of first air injection columns which are communicated with the hollow cavity of the first upper tray body in a protruding mode, the first air injection columns are distributed in a circle mode relative to the circle center of the first upper tray body, the extension lines of the first air injection columns distributed on the outermost circle in the first air injection columns are converged on the axis of the first tower body and converged outside the first tower body, and the air injection directions of other first air injection columns in the first air injection columns are vertically upward;
the absorption tower comprises a second tower body, a second flue gas uniform distribution device and a second spraying device, wherein the second tower body comprises a second main body, a second diameter-expanding section and a second lower part, and the second main body is connected to the second lower part through the second diameter-expanding section; the second spraying device is arranged at the top of the second main body, and the liquid inlet end of the second spraying device is connected to an absorption liquid circulating tank which is arranged outside the absorption tower and contains sodium hydroxide absorption liquid; a second flue gas outlet is formed in the top of the second main body, a second flue gas inlet is formed in the side wall of the second lower portion, the second flue gas inlet is connected to the first flue gas outlet of the desulfurizing tower, and a second liquid discharge port is formed in the bottom of the second lower portion; the second flue gas uniform distribution device is arranged in the second lower part and comprises a second upper tray body and a second lower tray body, the second upper tray body and the second lower tray body are both circular disc structures with hollow cavities inside and are coaxially arranged with the second tower body, the circle centers of the second upper tray body and the second lower tray body are connected through a second vertical pipe, so that the hollow cavities of the second upper tray body and the second lower tray body are communicated with each other, the circumferential side wall of the second lower tray body and the second flue gas inlet are connected through a second horizontal pipe, so that the hollow cavities of the second lower tray body are communicated with the second flue gas inlet, the circumferential side wall of the second lower tray body and the side wall of the second lower part are separated from each other by a certain distance, and the circumferential side wall of the second upper tray body and the side wall of the second lower part are separated from each other by a certain distance, the roof of disk body is provided with in the second in the outstanding a plurality of second air jet columns with the well plenum chamber intercommunication of disk body on the second, a plurality of second air jet columns for the centre of a circle position symmetric distribution of disk body on the second, a plurality of second air jet columns for the centre of a circle position of disk body distributes with the form of round on the second, distribute in a plurality of second air jet columns the extension line of the second air jet column of outer lane assemble in on the axis of second tower body, and assemble in the outside of second tower body, the air jet direction of other second air jet columns is vertical upwards in a plurality of second air jet columns.
Preferably, in the two-stage binary flue gas treatment system, the desulfurization tower further includes a first air blowing device, the first air blowing device includes a first annular air duct and a first air supply device, the first air supply device is disposed outside the desulfurization tower, the first annular air duct is disposed at a joint of the first main body and the first expanded diameter section and is abutted against a side wall of the first main body, an annular first vent is formed on a top wall of the first annular air duct, an air injection direction of the first vent is vertical and upward, and the first annular air duct is communicated with the first air supply device through a first air supply opening formed on a side wall of the first main body; the absorption tower further comprises a second air blowing device, the second air blowing device comprises a second annular air channel and a second air supply device, the second air supply device is arranged outside the absorption tower, the second annular air channel is arranged at the joint of the second main body and the second diameter-expanding section and is attached to the side wall of the second main body, an annular second air vent is formed in the top wall of the second annular air channel, the air injection direction of the second air vent is vertical upwards, and the second annular air channel is communicated with the second air supply device through a second air supply opening formed in the side wall of the second main body.
Preferably, in the two-stage binary flue gas treatment system, the system further comprises a sulfur dioxide and hydrogen sulfide detector, an alarm and a controller, wherein the sulfur dioxide and hydrogen sulfide detector is arranged at a second flue gas outlet of the absorption tower and is used for detecting the concentration of sulfur dioxide and hydrogen sulfide contained in the flue gas discharged from the absorption tower, and the controller is used for sending an alarm prompt when the concentration of sulfur dioxide detected by the sulfur dioxide and hydrogen sulfide detector exceeds a preset sulfur dioxide concentration standard and/or the concentration of hydrogen sulfide exceeds a preset hydrogen sulfide concentration standard.
Preferably, in the two-stage binary flue gas treatment system, the first lower part of the desulfurization tower is communicated with the desulfurization solution circulation tank, and a desulfurization solution circulation pump for pumping the desulfurization solution in the desulfurization solution circulation tank into the first spray device is arranged on a connecting pipeline between the desulfurization solution circulation tank and the first spray device; the desulfurization liquid circulating tank is also connected to a filtering device, a first pump is arranged on a connecting pipeline of the desulfurization liquid circulating tank and the liquid inlet end of the filtering device, a second pump is arranged on a connecting pipeline between the desulfurization liquid circulating tank and the liquid outlet end of the filtering equipment, a first pH value detector for detecting the pH value of the desulfurization solution is arranged in the desulfurization solution circulating tank, the first pH detector, the first pump and the second pump are all connected to the controller, when the first pH value detector detects that the pH value of the desulfurization solution reaches 7-8, the controller is used for controlling the first pump to work, thereby pumping the doctor solution in the doctor solution circulation tank into the filtration device, and the controller is configured to control the second pump to operate, thereby pumping the filtrate filtered by the filtration device into the doctor solution circulation tank.
Preferably, in the two-stage binary flue gas treatment system, the second lower part of the absorption tower is communicated with the absorption liquid circulation tank, and an absorption liquid circulation pump for pumping the absorption liquid in the absorption liquid circulation tank into the second spraying device is arranged on a connecting pipeline between the absorption liquid circulation tank and the second spraying device; the absorption liquid circulation tank is further connected to evaporation equipment, a third pump is arranged on a connecting pipeline of the absorption liquid circulation tank and a liquid inlet end of the evaporation equipment, a second pH value detector used for detecting the pH value of the absorption liquid is arranged in the absorption liquid circulation tank, the second pH value detector and the third pump are connected to the controller, and when the pH value detector detects that the pH value of the absorption liquid reaches 7-8, the controller is used for controlling the third pump to work, so that the absorption liquid in the absorption liquid circulation tank is pumped into the evaporation equipment.
Preferably, in the two-stage binary flue gas treatment system, the dust removal equipment comprises a gravity settling chamber and a bag-type dust remover, the gravity settling chamber is connected with the heat exchange equipment, and the bag-type dust remover is connected with the gravity settling chamber.
Preferably, in the two-stage binary flue gas treatment system, the heat exchange equipment is a phase-change heat storage type heat exchanger.
The invention at least comprises the following beneficial effects:
(1) the two-section binary flue gas treatment system sequentially carries out cooling and dedusting treatment, a sodium sulfide desulfurization process and sodium hydroxide hydrogen sulfide absorption treatment on the flue gas, organically combines a binary removal technology, greatly reduces the environment-friendly operation cost, and really realizes the clean, environment-friendly and energy-saving continuous operation.
(2) The invention improves the structures of the desulfurizing tower and the absorption tower, increases the diameter expanding section, and simultaneously improves the first flue gas uniform distribution device in the desulfurizing tower and the second flue gas uniform distribution device in the absorption tower, so that the flow of the flue gas in the desulfurizing tower and the absorption tower is more uniform, and the flue gas is prevented from flowing along the side walls of the desulfurizing tower and the absorption tower, thereby improving the desulfurizing efficiency of the desulfurizing tower and the absorption tower and improving the treatment efficiency of the two-section binary flue gas treatment system on the flue gas.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of a two-stage binary flue gas treatment system in accordance with an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a first flue gas uniform distribution device in one embodiment of the present invention;
fig. 3 is a schematic structural view of a first air blowing device according to an embodiment of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
As shown in fig. 1 and 2, the present invention provides a two-stage binary flue gas treatment system, comprising: a heat exchange device 1; the dust removing device is positioned at the downstream side of the heat exchange device 1 and is connected with the heat exchange device; the desulfurization tower 4 comprises a first tower body, a first flue gas uniform distribution device 9 and a first spraying device 8, wherein the first tower body is composed of a first main body 5, a first diameter expansion section 6 and a first lower part 7, and the first main body 5 is connected to the first lower part 7 through the first diameter expansion section 6; the first spraying device 8 is arranged at the top of the first main body, and the liquid inlet end of the first spraying device 8 is connected to a desulfurization liquid circulating tank 19 which is arranged outside the desulfurization tower 4 and contains sodium sulfide desulfurization liquid; a first flue gas outlet is formed in the top of the first main body 5, a first flue gas inlet is formed in the side wall of the first lower portion 7, the first flue gas inlet is connected to the dust removing equipment, and a first liquid discharging port is formed at the bottom of the first lower portion 7; the first flue gas uniform distribution device 9 is arranged inside the first lower part 7, the first flue gas uniform distribution device 9 comprises a first upper tray body 23 and a first lower tray body 24, the first upper tray body 23 and the first lower tray body 24 are both circular disc-shaped structures with hollow cavities therein and are coaxially arranged with the first tower body, the circle centers of the first upper tray body 23 and the first lower tray body 24 are connected through a first vertical pipe 26 so as to communicate the hollow cavities of the first upper tray body and the hollow cavities of the first lower tray body with each other, the circumferential side wall of the first lower tray body 24 is connected with the first flue gas inlet through a first horizontal pipe 25 so as to communicate the hollow cavities of the first lower tray body 24 with the first flue gas inlet, and the circumferential side wall of the first lower tray body 24 and the side wall of the first lower part 7 are separated from each other by a certain distance, the circumferential side wall of the first upper tray body 23 and the side wall of the first lower portion 7 are spaced at a certain distance from each other, a plurality of first air injection columns which are communicated with the hollow chamber of the first upper tray body are arranged on the top wall of the first upper tray body in a protruding mode, the plurality of first air injection columns are distributed in a circle mode relative to the circle center of the first upper tray body, the extension lines of the first air injection columns 27 distributed on the outermost circle in the plurality of first air injection columns are converged on the axis of the first tower body and converged outside the first tower body, and the air injection directions of other first air injection columns 28 in the plurality of first air injection columns are vertically upward; the absorption tower 12 comprises a second tower body, a second flue gas uniform distribution device 16 and a second spraying device 30, wherein the second tower body is composed of a second main body 13, a second expanded diameter section 14 and a second lower part 15, and the second main body 13 is connected to the second lower part 15 through the second expanded diameter section 14; the second spraying device 30 is arranged at the top of the second main body 13, and the liquid inlet end of the second spraying device 30 is connected to an absorption liquid circulating tank 21 which is arranged outside the absorption tower 12 and contains sodium hydroxide absorption liquid; a second flue gas outlet is formed in the top of the second main body 13, a second flue gas inlet is formed in the side wall of the second lower portion 16, the second flue gas inlet is connected to the first flue gas outlet of the desulfurizing tower 12, and a second liquid discharge port is formed in the bottom of the second lower portion 15; the second flue gas uniform distribution device 16 is arranged inside the second lower part 15, the second flue gas uniform distribution device 16 comprises a second upper tray body and a second lower tray body which are coaxially arranged with the second tower body, the second upper tray body and the second lower tray body are both circular disc-shaped structures with hollow chambers inside, the circle centers of the second upper tray body and the second lower tray body are connected through a second vertical pipe so as to communicate the hollow chambers of the second upper tray body and the hollow chambers of the second lower tray body with each other, the circumferential side wall of the second lower tray body is connected with the second flue gas inlet through a second horizontal pipe so as to communicate the hollow chambers of the second lower tray body with the second flue gas inlet, the circumferential side wall of the second lower tray body and the side wall of the second lower part are separated from each other by a certain distance, and the circumferential side wall of the second upper tray body and the side wall of the second lower part are separated from each other by a certain distance, the roof of disk body is provided with in the second in the outstanding and a plurality of second air jet columns that are provided with the well plenum chamber intercommunication of disk body on the second, a plurality of second air jet columns for the centre of a circle position symmetric distribution of disk body on the second, a plurality of second air jet columns for the centre of a circle position of disk body distributes with the form of round on the second, distribute in a plurality of second air jet columns the air-jet direction of distributing at outermost round second air jet column assemble in on the axis of second tower body, and assemble in the outside of second tower body, the air-jet direction of other second air jet columns is vertical upwards in a plurality of second air jet columns.
The method comprises the following steps of firstly reducing the temperature of the sulfur-containing flue gas from 350 ℃ to 170 ℃ by adopting heat exchange equipment and coarse dust removal equipment, and removing larger particle dust from the constant-temperature flue gas after preliminary dust removal, so that the operation load of a subsequent dust remover can be effectively reduced, and the subsequent dust remover further purifies the flue gas to remove dust particles with smaller particle sizes in the flue gas. No matter which dust removal mode is adopted, the dust concentration is reduced to the minimum concentration before desulfurization, which is very important for the stable operation of a desulfurization system and the improvement of the quality of desulfurization products.
The sodium sulfide desulfurization solution is sprayed from the top of the first tower body through the first spraying device 8, the flue gas enters the first flue gas uniform distribution device 9 from the first flue gas inlet and is sprayed upwards through the first flue gas uniform distribution device 9, and the desulfurization solution is in countercurrent contact with the flue gas, so that sulfur dioxide contained in the flue gas is removed.
In current desulfurizing tower, because the flue gas gets into the desulfurizing tower from the entry of desulfurizing tower bottom one side, the distribution of flue gas on the cross section of whole desulfurizing tower is uneven, and the flue gas concentration is higher in the position that is close to the entry, and the position flue gas concentration that is far away from the entry relatively is lower, and this just leads to the flue gas to flow up the reaction of in-process and doctor solution inhomogeneous, influences desulfurization effect.
In the invention, the flue gas firstly enters the first horizontal pipe 25 from the first flue gas inlet, then enters the hollow chamber of the first lower tray body 24, and then enters the hollow chamber of the first upper tray body 23 only through the first vertical pipe 26, and then is ejected from the plurality of first air injection columns on the first upper tray body. That is, the flue gas fills the whole hollow chamber of the first lower tray 24, and then flows to the hollow chamber of the first upper tray 23 through the first vertical pipe 26 at the middle position, in this process, the flow direction of the flue gas entering the first upper tray is vertical upward, and continues to diffuse upward from the position centered with respect to the desulfurization tower, and as the flue gas is sprayed from the plurality of gas spray columns, the flue gas can flow upward in a relatively uniform manner at the first lower part of the whole first tower body. Namely, the flue gas does not enter from one side of the desulfurizing tower any longer, so that the condition that the concentration distribution of the flue gas at the bottom of the desulfurizing tower is not uniform can be avoided.
In the process that the flue gas flows upwards, the flue gas flows upwards along the side wall of the desulfurizing tower easily, so that the flue gas flowing along the wall cannot be in good contact with the desulfurizing liquid in the falling process, and further the desulfurizing effect of the flue gas is not ideal enough. The invention improves the arrangement mode of the plurality of first air injection columns, namely the plurality of first air injection columns are distributed in a circle relative to the circle center of the first upper disc body, the extension lines of the outermost circles of the first air injection columns 27 in the plurality of first air injection columns are converged on the axis of the first tower body and converged outside the first tower body, and the air injection directions of other first air injection columns 28 are vertically upward. The first gas jet column at the outermost ring inclines towards the axial direction of the first upper disc body (namely the axial direction of the first tower body), so that the flow direction of the flue gas jetted by the first gas jet column at the outermost ring is deviated to the axial direction of the first tower body and is not parallel to the axial direction of the first tower body any more, and the condition that the flue gas at the outermost side flows along the wall is relieved. In the process, the inclination angle of the first air injection column at the outermost ring is not too large, and the extension line of the first air injection column at the outermost ring needs to be intersected outside the first tower body. If the inclination angle of the first gas injection column of outermost round is too big, this part flue gas can assemble to the centre of first tower body, can influence the even condition of flue gas distribution in the first tower body too much.
The first tower body of the desulfurizing tower is designed into a three-section structure, the desulfurizing tower comprises a first main body 5, a first diameter expanding section 6 and a first lower part 7, and a first flue gas uniform distribution device 9 is arranged in the first lower part 7. That is to say, the flue gas that is spout through first flue gas equipartition device flows upwards, first gets into first hole enlargement section, and then gets into inside the first main part. The cross-sectional area of the first expanding section is increased, so that the flowing speed of the flue gas is reduced, the reaction effect of the flue gas and the desulfurization solution is improved, and the desulfurization efficiency is improved. And the flow direction of the flue gas sprayed by the first gas spraying column on the outermost ring is inclined towards the axial direction of the first tower body, but under the action of the first diameter expanding section, the flow direction of the flue gas sprayed by the first gas spraying column on the outermost ring is slightly reduced relative to the axial direction of the first tower body, so that the flue gas sprayed by the first gas spraying column on the outermost ring is prevented from generating excessive interference on the flue gas sprayed by other first gas spraying columns, and the effect of uniform distribution of the flue gas is prevented from being influenced. The invention can reduce the adherent flow of the smoke on one hand and improve the uniform distribution effect of the smoke on the other hand.
The sodium hydroxide absorption liquid is sprayed from the top of the second tower body through the second spraying device 30, the flue gas enters the second flue gas uniform distribution device 16 from the second flue gas inlet and is sprayed upwards through the second flue gas uniform distribution device 16, and the absorption liquid is in countercurrent contact with the flue gas, so that the hydrogen sulfide in the flue gas is removed.
The invention also improves the structure of the absorption tower and the second flue gas distribution device. The second flue gas distribution device has the same structure as the first flue gas distribution device, and the second flue gas distribution device also has the function of avoiding uneven concentration distribution of flue gas at the bottom of the desulfurization tower and relieving the condition of adherent flow of the flue gas in the absorption tower. The absorption tower is also composed of three sections of structures, the absorption tower comprises a second tower body, a second expanding section and a second lower part, and the design mode and the working principle of the absorption tower are basically consistent with those of the desulfurization tower. The cross section area of the second expanding section is increased, so that the flowing speed of the flue gas is reduced, the reaction effect of the flue gas and the absorption liquid is improved, the desulfurization efficiency is improved, meanwhile, the second expanding section can be matched with the second air injection column on the outermost circle, the flue gas sprayed by the second air injection column on the outermost circle is prevented from generating excessive interference on the flue gas sprayed by other second air injection columns, and the effect of influencing the uniform distribution of the flue gas is avoided.
The desulfurization liquid can fall into the bottom of the desulfurization tower through the space between the first upper tray body, the first lower tray body and the first lower part and is discharged from the first liquid discharge port. The absorption liquid can fall into the bottom of the absorption tower through the space between the second upper tray body, the second lower tray body and the second lower part and is discharged from the second liquid outlet.
The two-section binary flue gas treatment system sequentially carries out cooling and dedusting treatment, a sodium sulfide desulfurization process and sodium hydroxide hydrogen sulfide absorption treatment on the flue gas, organically combines a binary removal technology, greatly reduces the environment-friendly operation cost, and really realizes the clean, environment-friendly and energy-saving continuous operation.
The invention improves the structures of the desulfurizing tower and the absorption tower, increases the diameter expanding section, and simultaneously improves the first flue gas uniform distribution device in the desulfurizing tower and the second flue gas uniform distribution device in the absorption tower, so that the flow of the flue gas in the desulfurizing tower and the absorption tower is more uniform, and the flue gas is prevented from flowing along the side walls of the desulfurizing tower and the absorption tower, thereby improving the desulfurizing efficiency of the desulfurizing tower and the absorption tower and improving the treatment efficiency of the two-section binary flue gas treatment system on the flue gas.
As shown in fig. 3, in the two-stage binary flue gas treatment system, the desulfurization tower further includes a first air blowing device, the first air blowing device includes a first annular air duct 10 and a first air supply device 11, the first air supply device is disposed outside the desulfurization tower 4, the first annular air duct 10 is disposed at a joining portion of the first main body 5 and the first expanded-diameter section 6, and is abutted against a side wall of the first main body 5, an annular first vent 29 is formed on a top wall of the first annular air duct 10, an air blowing direction of the first vent 29 is vertical, and the first annular air duct 10 is communicated with the first air supply device through a first air blowing opening formed on a side wall of the first main body 5; the absorption tower further comprises a second air blowing device, the second air blowing device comprises a second annular air duct 17 and a second air supply device 18, the second air supply device is arranged outside the absorption tower, the second annular air duct 17 is arranged at the joint of the second main body 13 and the second diameter-expanding section 14 and is attached to the side wall of the second main body 13, an annular second air vent is formed in the top wall of the second annular air duct 17, the air injection direction of the second air vent is vertical upwards, and the second annular air duct is communicated with the second air supply device through a second air supply opening formed in the side wall of the second main body.
The first air supply device sends air to the first annular air duct, and the air is sprayed out from the annular first ventilation opening of the first annular air duct. The first annular channel is abutted against the side wall of the first main body and is positioned at the joint of the first main body and the first diameter-expanding section, and air sprayed out of the annular first ventilation opening forms an air layer abutted against the side wall of the first main body. The air layer is helpful for isolating the flue gas and reducing the condition of adherent flow of the flue gas, thereby increasing the contact between the flue gas and the desulfurization solution and improving the efficiency of removing sulfur dioxide from the flue gas.
In the same way, the absorption tower is also provided with a second air blowing device, and the structure of the second air blowing device is the same as that of the first air blowing device in the desulfurization tower. Air is sent into the second annular air channel by the second air supply device, and the air is sprayed out from a second air vent of the second annular air channel, so that an air layer attached to the side wall of the second main body is formed. The air layer is helpful for isolating the flue gas and reducing the condition of adherent flow of the flue gas, thereby increasing the contact between the flue gas and the absorption liquid and improving the efficiency of removing hydrogen sulfide from the flue gas.
Preferably, in the two-stage binary flue gas treatment system, the system further includes a sulfur dioxide and hydrogen sulfide detector, an alarm and a controller, the sulfur dioxide and hydrogen sulfide detector is disposed at the second flue gas outlet of the absorption tower and is used for detecting the concentrations of sulfur dioxide and hydrogen sulfide contained in the flue gas discharged from the absorption tower, and the controller is used for sending an alarm prompt when the concentration of sulfur dioxide detected by the sulfur dioxide and hydrogen sulfide detector exceeds a preset sulfur dioxide concentration standard and/or the concentration of hydrogen sulfide exceeds a preset hydrogen sulfide concentration standard.
The invention utilizes the sulfur dioxide and hydrogen sulfide detectors to detect the components of the flue gas discharged by the absorption tower. Once the concentration of sulfur dioxide or hydrogen sulfide exceeds the standard, the controller controls the alarm to give an alarm, so that managers can know the flue gas treatment condition in time and check the system operation condition in time. The concentration conditions of the sulfur dioxide and the hydrogen sulfide can be respectively detected by a sulfur dioxide detector and a hydrogen sulfide detector, and can also be detected by a detector integrating the detection functions of the sulfur dioxide and the hydrogen sulfide. The invention can automatically monitor and remind the desulfurization condition of the flue gas, improves the monitoring efficiency of the system and is beneficial to improving the reliability of the system for the desulfurization treatment of the flue gas.
Preferably, in the two-stage binary flue gas treatment system, the first lower part 7 of the desulfurization tower is communicated with the desulfurization solution circulation tank 19, and a desulfurization solution circulation pump for pumping the desulfurization solution in the desulfurization solution circulation tank into the first spray device is arranged on a connecting pipeline between the desulfurization solution circulation tank 19 and the first spray device 8; the desulfurization liquid circulating tank 19 is also connected to a filtering device 20, a first pump is arranged on a connecting pipeline of the desulfurization liquid circulating tank 19 and the liquid inlet end of the filtering device 20, a second pump is arranged on a connecting pipeline between the desulfurization liquid circulating tank 19 and the liquid outlet end of the filtering device 20, a first pH detector for detecting the pH of the desulfurization solution is provided in the desulfurization solution circulation tank 19, the first pH detector, the first pump and the second pump are all connected to the controller, when the first pH value detector detects that the pH value of the desulfurization solution reaches 7-8, the controller is used for controlling the first pump to work, thereby pumping the doctor solution in the doctor solution circulation tank into the filtration device, and the controller is configured to control the second pump to operate, thereby pumping the filtrate filtered by the filtration device into the doctor solution circulation tank.
Conveying the solution containing the sodium sulfide component to an alkali liquor storage tank for storage; conveying the alkali liquor to a desulfurization liquid circulating tank, carrying out countercurrent contact with sulfur-containing flue gas in a desulfurization tower for circulating desulfurization, and discharging desulfurization liquid from the bottom of the tower and flowing into the desulfurization liquid circulating tank; and when the PH value of the slurry in the desulfurization liquid circulating tank reaches 7-8, sending the slurry to a filtering device for a filter pressing process, pulping and filtering the slurry together with the two alkali washing mud, sending the filter cake as common industrial solid waste to a slag yard for storage, and sending the filtrate to the desulfurization liquid circulating tank for storage and use. The embodiment can realize automatic monitoring of the consumption condition of the desulfurization solution, realize the recycling of the desulfurization solution and improve the desulfurization efficiency and the overall operation efficiency of the system.
Preferably, in the two-stage binary flue gas treatment system, the second lower part 15 of the absorption tower is communicated with the absorption liquid circulation tank 21, and an absorption liquid circulation pump for pumping the absorption liquid in the absorption liquid circulation tank 21 into the second spraying device is arranged on a connecting pipeline between the absorption liquid circulation tank 21 and the second spraying device 30; the absorption liquid circulation tank 21 is further connected to an evaporation device 22, a third pump is arranged on a connecting pipeline between the absorption liquid circulation tank 21 and a liquid inlet end of the evaporation device 22, a second pH value detector used for detecting the pH value of the absorption liquid is arranged in the absorption liquid circulation tank 21, the second pH value detector and the third pump are connected to the controller, and when the pH value detector detects that the pH value of the absorption liquid reaches 7-8, the controller is used for controlling the third pump to work, so that the absorption liquid in the absorption liquid circulation tank is pumped into the evaporation device.
The flue gas after desulfurization also contains a large amount of H2S. The sodium hydroxide solution is pumped into the absorption tower by a centrifugal pump to be in reverse contact with the flue gas for cyclic absorption; and the absorption liquid flows into a circulating pool from the bottom of the tower for recycling, and when the pH value of the absorption liquid reaches 7-8, the absorption liquid is completely used as a semi-product for producing sodium sulfide and enters evaporation equipment for evaporation process recovery. The embodiment can realize automatic monitoring of the consumption condition of the absorption liquid, effectively recycle the waste liquid, improve the desulfurization efficiency and the overall operation efficiency of the system, and simultaneously improve the environment-friendly degree of the treatment process.
Before sulfur-containing flue gas enters the dust remover, the temperature of the flue gas is reduced from 350 ℃ to 170 ℃ by adopting phase-change heat storage type heat exchange cooling and coarse dust removing equipment, and the constant-temperature flue gas can remove larger particle dust after primary dust removal, so that the operation load of the dust remover can be effectively reduced.
Preferably, in the two-stage binary flue gas treatment system, the dust removal equipment comprises a gravity settling chamber 2 and a bag-type dust remover 3, the gravity settling chamber 2 is connected with the heat exchange equipment 1, and the bag-type dust remover 3 is connected with the gravity settling chamber 2. The gravity dust collector can play the effect of preliminary dust removal and cooling, and the sack cleaner can detach the less dust particle of particle size that carries in the flue gas.
Preferably, in the two-stage binary flue gas treatment system, the heat exchange device 1 is a phase-change heat storage type heat exchanger.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (7)
1. Two sections binary flue gas processing systems, its characterized in that includes:
heat exchange equipment;
the dust removing device is positioned on the downstream side of the heat exchange device and is connected with the heat exchange device;
the desulfurizing tower comprises a first tower body, a first flue gas uniform distribution device and a first spraying device, wherein the first tower body comprises a first main body, a first diameter expansion section and a first lower part, and the first main body is connected to the first lower part through the first diameter expansion section; the first spraying device is arranged at the top of the first main body, and the liquid inlet end of the first spraying device is connected to a desulfurization liquid circulating pool which is arranged outside the desulfurization tower and contains sodium sulfide desulfurization liquid; a first flue gas outlet is formed in the top of the first main body, a first flue gas inlet is formed in the side wall of the first lower portion, the first flue gas inlet is connected to the dust removing equipment, and a first liquid discharging port is formed in the bottom of the first lower portion; the first flue gas uniform distribution device is arranged in the first lower part and comprises a first upper tray body and a first lower tray body, the first upper tray body and the first lower tray body are both of circular disc structures with hollow cavities inside and are coaxially arranged with the first tower body, the circle centers of the first upper tray body and the first lower tray body are connected through a first vertical pipe so as to communicate the hollow cavities of the first upper tray body and the first lower tray body with each other, the circumferential side wall of the first lower tray body is connected with the first flue gas inlet through a first horizontal pipe so as to communicate the hollow cavities of the first lower tray body with the first flue gas inlet, the circumferential side wall of the first lower tray body and the side wall of the first lower part are separated from each other by a certain distance, and the circumferential side wall of the first upper tray body and the side wall of the first lower part are separated from each other by a certain distance, the top wall of the first upper tray body is provided with a plurality of first air injection columns which are communicated with the hollow cavity of the first upper tray body in a protruding mode, the first air injection columns are distributed in a circle mode relative to the circle center of the first upper tray body, the extension lines of the first air injection columns distributed on the outermost circle in the first air injection columns are converged on the axis of the first tower body and converged outside the first tower body, and the air injection directions of other first air injection columns in the first air injection columns are vertically upward;
the absorption tower comprises a second tower body, a second flue gas uniform distribution device and a second spraying device, wherein the second tower body comprises a second main body, a second diameter-expanding section and a second lower part, and the second main body is connected to the second lower part through the second diameter-expanding section; the second spraying device is arranged at the top of the second main body, and the liquid inlet end of the second spraying device is connected to an absorption liquid circulating tank which is arranged outside the absorption tower and contains sodium hydroxide absorption liquid; a second flue gas outlet is formed in the top of the second main body, a second flue gas inlet is formed in the side wall of the second lower portion, the second flue gas inlet is connected to the first flue gas outlet of the desulfurizing tower, and a second liquid discharge port is formed in the bottom of the second lower portion; the second flue gas uniform distribution device is arranged in the second lower part and comprises a second upper tray body and a second lower tray body, the second upper tray body and the second lower tray body are both circular disc structures with hollow cavities inside and are coaxially arranged with the second tower body, the circle centers of the second upper tray body and the second lower tray body are connected through a second vertical pipe, so that the hollow cavities of the second upper tray body and the second lower tray body are communicated with each other, the circumferential side wall of the second lower tray body and the second flue gas inlet are connected through a second horizontal pipe, so that the hollow cavities of the second lower tray body are communicated with the second flue gas inlet, the circumferential side wall of the second lower tray body and the side wall of the second lower part are separated from each other by a certain distance, and the circumferential side wall of the second upper tray body and the side wall of the second lower part are separated from each other by a certain distance, the roof of disk body is provided with in the second in the outstanding a plurality of second air jet columns with the well plenum chamber intercommunication of disk body on the second, a plurality of second air jet columns for the centre of a circle position symmetric distribution of disk body on the second, a plurality of second air jet columns for the centre of a circle position of disk body distributes with the form of round on the second, distribute in a plurality of second air jet columns the extension line of the second air jet column of outer lane assemble in on the axis of second tower body, and assemble in the outside of second tower body, the air jet direction of other second air jet columns is vertical upwards in a plurality of second air jet columns.
2. The two-stage binary flue gas treatment system according to claim 1, wherein the desulfurization tower further comprises a first air blowing device, the first air blowing device comprises a first annular air duct and a first air supply device, the first air supply device is arranged outside the desulfurization tower, the first annular air duct is arranged at a joint of the first main body and the first expanded diameter section and is abutted against the side wall of the first main body, an annular first vent is formed in the top wall of the first annular air duct, the air injection direction of the first vent is vertically upward, and the first annular air duct is communicated with the first air supply device through a first air supply opening formed in the side wall of the first main body; the absorption tower further comprises a second air blowing device, the second air blowing device comprises a second annular air channel and a second air supply device, the second air supply device is arranged outside the absorption tower, the second annular air channel is arranged at the joint of the second main body and the second diameter-expanding section and is attached to the side wall of the second main body, an annular second air vent is formed in the top wall of the second annular air channel, the air injection direction of the second air vent is vertical upwards, and the second annular air channel is communicated with the second air supply device through a second air supply opening formed in the side wall of the second main body.
3. The two stage binary flue gas treatment system of claim 2, further comprising a sulfur dioxide and hydrogen sulfide detector disposed at the second flue gas outlet of the absorption tower for detecting the concentration of sulfur dioxide and hydrogen sulfide contained in the flue gas discharged through the absorption tower, an alarm, and a controller for issuing an alarm prompt if the concentration of sulfur dioxide detected by the sulfur dioxide and hydrogen sulfide detector exceeds a preset sulfur dioxide concentration standard and/or the concentration of hydrogen sulfide exceeds a preset hydrogen sulfide concentration standard.
4. The two-stage binary flue gas treatment system according to claim 3, wherein the first lower part of the desulfurization tower is communicated with the desulfurization solution circulation tank, and a desulfurization solution circulation pump for pumping the desulfurization solution in the desulfurization solution circulation tank into the first spray device is arranged on a connecting pipeline between the desulfurization solution circulation tank and the first spray device; the desulfurization liquid circulating tank is also connected to a filtering device, a first pump is arranged on a connecting pipeline of the desulfurization liquid circulating tank and the liquid inlet end of the filtering device, a second pump is arranged on a connecting pipeline between the desulfurization liquid circulating tank and the liquid outlet end of the filtering equipment, a first pH value detector for detecting the pH value of the desulfurization solution is arranged in the desulfurization solution circulating tank, the first pH detector, the first pump and the second pump are all connected to the controller, when the first pH value detector detects that the pH value of the desulfurization solution reaches 7-8, the controller is used for controlling the first pump to work, thereby pumping the doctor solution in the doctor solution circulation tank into the filtration device, and the controller is configured to control the second pump to operate, thereby pumping the filtrate filtered by the filtration device into the doctor solution circulation tank.
5. The two-stage binary flue gas treatment system according to claim 4, wherein the second lower part of the absorption tower is communicated with the absorption liquid circulation tank, and an absorption liquid circulation pump for pumping the absorption liquid in the absorption liquid circulation tank into the second spraying device is arranged on a connecting pipeline between the absorption liquid circulation tank and the second spraying device; the absorption liquid circulation tank is further connected to evaporation equipment, a third pump is arranged on a connecting pipeline of the absorption liquid circulation tank and a liquid inlet end of the evaporation equipment, a second pH value detector used for detecting the pH value of the absorption liquid is arranged in the absorption liquid circulation tank, the second pH value detector and the third pump are connected to the controller, and when the pH value detector detects that the pH value of the absorption liquid reaches 7-8, the controller is used for controlling the third pump to work, so that the absorption liquid in the absorption liquid circulation tank is pumped into the evaporation equipment.
6. The two-stage binary flue gas treatment system of claim 5, wherein the dust removal device comprises a gravity settling chamber and a bag-type dust remover, the gravity settling chamber is connected with the heat exchange device, and the bag-type dust remover is connected with the gravity settling chamber.
7. The two-stage binary flue gas treatment system of claim 6, wherein the heat exchange device is a phase change regenerative heat exchanger.
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