CN115554830A - Device and method for strengthening liquid column tower desulfurization by additionally arranging air guide coil pipe - Google Patents

Device and method for strengthening liquid column tower desulfurization by additionally arranging air guide coil pipe Download PDF

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Publication number
CN115554830A
CN115554830A CN202211198027.7A CN202211198027A CN115554830A CN 115554830 A CN115554830 A CN 115554830A CN 202211198027 A CN202211198027 A CN 202211198027A CN 115554830 A CN115554830 A CN 115554830A
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liquid
absorption
tower
gas
main body
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袁方
吴涛
杨强
赵红林
储政
刘博�
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China Petroleum and Chemical Corp
East China University of Science and Technology
Sinopec Nanjing Chemical Industry Corp
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China Petroleum and Chemical Corp
East China University of Science and Technology
Sinopec Nanjing Chemical Industry Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/79—Injecting reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The invention provides a device and a method for strengthening liquid column tower desulfurization by additionally arranging an air guide coil pipe, wherein the device comprises an absorption tower main body and a reverse spray tower, the lower end of the reverse spray tower is communicated with the absorption tower main body, and the upper part of the reverse spray tower is provided with a tail gas inlet and is connected with a fan; the top of the absorption tower main body is provided with a tail gas outlet, and the bottom of the absorption tower main body is used for storing absorption liquid; a liquid distributor and a liquid column injection device are arranged below the tail gas inlet in the reverse spray tower; the lower end of the reverse spray tower is provided with an air guide coil pipe, the air guide coil pipe comprises an air guide disc and a plurality of air guide pipes communicated with the air guide disc, and the air guide pipes are immersed in the absorption liquid at the bottom of the absorption tower main body; after entering the tower to react and absorb with the liquid column sprayed by the liquid column spraying device, the sulfur-containing tail gas is introduced into the absorption liquid in the absorption tower main body from the air guide coil pipe under the pressure of the fan to be aerated, and secondary reaction absorption is carried out, so as to achieve better absorption effect.

Description

Device and method for strengthening liquid column tower desulfurization by additionally arranging air guide coil pipe
Technical Field
The invention belongs to the technical field of flue gas desulfurization, and particularly relates to a device and a method for strengthening liquid column tower desulfurization by additionally arranging an air guide coil pipe.
Background
SO 2 Is a gaseous pollutant with large quantity and wide influence range in the air pollutants, and is one of the main air pollutants faced by people at present. SO in atmosphere 2 The sources of (a) fall into two broad categories: natural sources and man-made sources. SO of natural origin due to the self-cleaning capacity of the atmospheric environment 2 The serious air pollution can not be caused generally; but artificially emitted SO 2 Large amount of SO in the atmosphere 2 2/3 of the total amount is a main cause of air pollution and acid rain. If the water cannot be effectively treated, the acidification of soil and water is increased, the ecological balance is damaged, and the biodiversity is influenced.
With the national attention on environmental protection, the enhancement of environmental awareness and the popularization of environmental regulations, most sulfuric acid enterprises in China increase the investment on sulfuric acid tail gas treatment, wherein a liquid column desulfurization tower has sufficient mass transfer with gas and liquid, and the advantage of high desulfurization efficiency becomes the focus of attention. However, the problems of low absorption efficiency of the liquid column alkaline washing tower, secondary washing, high cost and the like still exist in the actual industrial production.
CN202983508U discloses a liquid column tower multistage multi-scale injection apparatus, which is technically characterized in that injection nozzles of different types and heights are arranged in an absorption tower, and a plurality of layers of liquid drop dense layers with gradually increased particle sizes are sequentially formed in a tower body space.
CN109621681A discloses a Venturi desulfurization device, which comprises a main tower body, an air inlet pipe, a first spray device, a Venturi device, a second spray device, a desulfurization pump and an air outlet pipe, wherein a left tower chamber and a right tower chamber which are separated from each other are formed inside the main tower body, the inside of the right tower chamber is divided into an atomizing chamber, a reaction chamber and a purification chamber which are sequentially communicated from top to bottom, and the purification chamber is communicated with the left tower chamber through a connecting pipe; the air inlet pipe penetrates through the left tower chamber and is communicated with the top of the right tower chamber; the first spraying device is arranged in the atomizing chamber; the Venturi device is arranged in the reaction chamber; the second spraying device is arranged in the reaction chamber and penetrates through the Venturi device; the desulphurization pump is arranged on the outer side of the right tower chamber and is respectively connected with the first spraying device and the second spraying device; the air outlet pipe is communicated with the inside of the left tower chamber. The Venturi desulfurization device can effectively improve the liquid-gas ratio and reduce the using amount of the absorption liquid, but the desulfurization efficiency is not obviously improved, and the absorbed tail gas still cannot meet the requirement of industrial emission.
Therefore, the development of a more efficient and low-cost flue gas desulfurization method and device has great significance in the field of environmental protection and the realization of the national strategy of carbon neutralization.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a device and a method for strengthening liquid column tower desulfurization by additionally arranging an air guide coil pipe. Through set gradually liquid column sprayer and air guide coil pipe in the tower against spouting, the flue gas that gets into in the tower is at first through liquid column reaction absorption back, and the aeration is carried out in letting in the absorption liquid of absorption tower main part bottom through air guide coil pipe rethread, carries out the secondary reaction and absorbs to gas acceleration rate to the best defogging speed within range through porous throttle plate, realizes good defogging effect.
The invention is realized by the following technical scheme:
the utility model provides an install gas guide coil pipe additional and strengthen device of liquid column tower desulfurization, strengthen device of liquid column tower desulfurization includes absorption tower main part and lower extreme and the contrary tower that spouts of absorption tower main part lateral wall intercommunication, wherein:
the upper part of the reverse spray tower is provided with a tail gas inlet, and the tail gas inlet is connected with a fan and used for blowing in tail gas; the top of the absorption tower main body is provided with a tail gas outlet, and the bottom of the absorption tower main body is used for storing absorption liquid;
in the reverse spray tower, a liquid distributor and a liquid column injection device with the lower end communicated and fixed with the liquid distributor are installed below the tail gas inlet, the liquid column injection device comprises a plurality of liquid column injectors, a liquid inlet of the liquid distributor is communicated with the bottom end of the absorption tower main body through a circulating pipeline, and is used for conveying absorption liquid stored at the bottom in the absorption tower main body to the liquid distributor for distribution, then injecting the absorption liquid into the reverse spray tower through the liquid column injection device for reaction and absorption with the tail gas, and a water pump is arranged on the circulating pipeline;
the lower end of the reverse spray tower is provided with an air guide coil pipe, the air guide coil pipe comprises an air guide disc and a plurality of air guide pipes communicated with the air guide disc, the periphery of the air guide disc is fixedly connected with the inner wall of the reverse spray tower, and the air guide pipes are immersed in the absorption liquid at the bottom of the absorption tower main body and used for introducing the gas absorbed through liquid column reaction into the absorption liquid at the bottom of the absorption tower main body for aeration so as to carry out secondary enhanced reaction absorption.
The invention is further provided that the air guide plate is vertically connected with the inner wall of the reverse spray tower, and the air guide pipe is immersed in the lower part of the absorption liquid at the bottom of the absorption tower main body.
The invention is further set that the air guide coil pipe is made of PVC material, the number and the pipe diameter of the air guide pipes are adjusted according to the smoke treatment capacity of the liquid column tower, wherein the pipe diameter of the air guide pipes is set to be 1-5cm, and the number is adjusted according to the size of the air guide coil.
The invention is further arranged in that a throttle orifice plate and a demister are sequentially arranged in the absorption tower main body above the connection part of the absorption tower main body and the reverse spray tower, and the throttle orifice plate and the demister are used for accelerating the gas absorbed by the aeration reaction to the range of the optimal demisting speed through the throttle orifice plate, demisting the gas by the demister and discharging the gas from the tail gas outlet.
The invention is further set that the orifice plate is made of polypropylene, the thickness of the orifice plate is 3-5cm, the diameter range of the opening is 0.1-1.5mm, and the orifice plate can be correspondingly adjusted according to different used demisters.
The invention is further provided with a liquid adding port arranged on the side wall of the absorption tower main body and used for introducing absorption liquid required by the device for enhancing the desulfurization of the liquid column tower to the bottom of the absorption tower main body; the liquid filling port is connected with a liquid filling port valve and used for controlling the feeding of the absorption liquid in the absorption tower main body.
The invention is further provided that a main body tower liquid outlet valve and an ejector liquid inlet valve are sequentially arranged on the circulating pipeline along the water flow direction, and the main body tower liquid outlet valve and the ejector liquid inlet valve are arranged into one or more than one according to the actual operation requirement; the circulating pipeline is provided with a liquid flowmeter, and a first pressure gauge and a second pressure gauge are sequentially arranged along the water flow direction and used for monitoring the flow and the pressure on the circulating pipeline; and a liquid discharge pipeline is connected to the circulating pipeline, and a liquid discharge port valve is arranged on the liquid discharge pipeline and is used for controlling the discharge of the absorption liquid in the absorption tower main body.
The invention is further arranged that the liquid discharge pipeline is arranged between the liquid outlet valve of the main tower and the liquid inlet valve of the ejector on the circulating pipeline and between the first pressure gauge and the second pressure gauge, so that the first pressure gauge and the second pressure gauge are respectively used for monitoring the pressure of the liquid outlet section and the circulating section on the circulating pipeline.
The invention is further provided that the top end in the reverse spray tower is provided with a spray device for spraying the small fog drops to react with the tail gas which just enters the reverse spray tower; the spraying device is connected with an external spraying liquid pipeline or connected with a spraying liquid pipeline communicated with the bottom end of the absorption tower main body. Preferably, the spraying liquid pipeline is connected with the circulating pipeline, the absorption liquid in the absorption tower main body is used for spraying on the top of the reverse spray tower, and a spraying device valve is arranged on the spraying liquid pipeline and used for controlling feeding of the spraying liquid.
The invention also provides a method for strengthening flue gas desulfurization by using the device for strengthening liquid column tower desulfurization by additionally arranging the air guide coil, which comprises the following specific steps of:
tail gas containing sulfur dioxide enters the reverse spray tower from a tail gas inlet of the reverse spray tower through the fan and reacts and absorbs with a liquid column sprayed by the liquid column spraying device; introducing the reacted gas into the absorption liquid in the absorption tower main body from the gas guide coil pipe at the lower part of the reverse spray tower under the pressure of the fan for aeration so as to carry out secondary reaction absorption, and circulating the absorption liquid in the reverse spray tower into the absorption tower main body through the gas guide coil pipe; and gas after the aeration reaction is discharged from the tail gas outlet.
The invention is further set that the spraying device generates a large amount of micro fog drops with the diameter of 30-120 mu m, and the tail gas entering the reverse spray tower firstly reacts with the small fog drops sprayed by the spraying device at the top end of the reverse spray tower to carry out primary absorption.
The invention is further arranged that in order to ensure that the absorption liquid smoothly enters the liquid column ejector and the liquid column with enough height is generated by ejection, a certain pressure is provided by the water pump, specifically, the water pressure of the water pump needs to reach 0.35Mpa, and the lift is set to be more than 35 m.
The invention is further set that the gas after the aeration reaction flows through the demister after the speed is increased by the throttle orifice plate so as to achieve the optimal demisting effect; and the demisted gas is discharged from the tail gas outlet.
The invention is further set that the flow velocity of the gas after the aeration of the gas guide coil pipe is 0.5-1.0m/s, and the flow velocity of the gas after the throttling of the throttling orifice plate is increased to 2-4m/s, thereby achieving the optimal demisting flow velocity range.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a device and a method for strengthening liquid column tower desulfurization by additionally arranging an air guide coil pipe, wherein gas reacted in a liquid column tower is introduced into absorption liquid again for aeration through the additionally arranged air guide coil pipe, and secondary absorption mass transfer is carried out, so that a better absorption effect is achieved, and the desulfurization efficiency can be greatly improved; meanwhile, the throttle orifice is additionally arranged, and the speed of the gas overflowing after aeration is increased after passing through the throttle orifice, so that the fog content of the gas at the outlet is lower.
The method has the advantages of high desulfurization efficiency, good desulfurization effect, low fog content in the outlet gas and the like.
Drawings
FIG. 1 is a schematic flow chart of a process for enhancing desulfurization in a liquid column tower by adding a gas guide coil according to the present invention;
FIG. 2 is a front view of the air guide coil of the present invention;
FIG. 3 is a side view of an air induction coil according to the present invention;
FIG. 4 is a front view of an orifice plate according to the present invention;
FIG. 5 is a side view of an orifice plate according to the present invention;
FIG. 6 is a schematic view of a process flow of the multi-stage Venturi jet enhanced flue gas desulfurization according to the present invention;
FIG. 7 is a schematic diagram of a multi-stage venturi jet droplet design according to the present invention;
FIG. 8 isbase:Sub>A sectional view of the reverse spray tower of FIG. 7 taken along plane A-A;
FIG. 9 is a schematic external view of a venturi eductor according to the present invention;
FIG. 10 is a cross-sectional view of the internal construction of a venturi eductor in accordance with the present invention;
wherein, 1-the absorption tower main body; 2-a reverse spray tower; 3-tail gas inlet; 4-tail gas outlet; 5-a liquid distributor; 6-liquid column injection device; 6-1 first-stage Venturi ejector; 6-2 two-stage Venturi ejector; 6-3 three-stage Venturi ejector; 6-4 Venturi liquid inlets; 6-5 Venturi outlets; 6-6 self-suction air inlet; 6-7 water inlet section; 6-8 mixing section; 6-9 water outlet section; 6-10 throats; 7-a recycle line; 7-1 water pump; 7-2 main tower liquid outlet valve; 7-3 liquid inlet valve of ejector; 7-4 a first pressure gauge; 7-5 of a second pressure gauge; 7-6 liquid flow meter; 8-a spraying device; 9-a demister; 10-a liquid feeding port; 10-1 of a liquid filling port valve; 11-a drain line; 11-1 liquid outlet valve; 12-spray liquid line; 12-1 spray device valve; 13-gas guiding coiled pipe; 13-1 air guide disc; 13-2, an air duct; 14-a restriction orifice plate; 15-a fan.
Detailed Description
The present invention will be described in further detail with reference to examples. It is to be understood that the following examples are for illustrative purposes only and are not to be construed as limiting the scope of the present invention, and that certain insubstantial modifications and adaptations of the invention may be made by those skilled in the art based on the teachings herein.
Example 1
The invention relates to a device for strengthening liquid column tower desulfurization by additionally arranging an air guide coil pipe, which comprises an absorption tower main body 1 and a reverse spray tower 2, wherein the lower end of the reverse spray tower 2 is communicated with the side wall of the absorption tower main body 1, the upper part of the reverse spray tower 2 is provided with a tail gas inlet 3, and the tail gas inlet 3 is connected with a fan 15 and used for blowing in tail gas; the top of the absorption tower main body 1 is provided with a tail gas outlet 4, and the bottom of the absorption tower main body 1 is used for storing absorption liquid; the spraying device 8 is arranged at the top end in the reverse spraying tower 2 and is used for spraying small fog drops to react with tail gas which just enters the reverse spraying tower 2; in the reverse spray tower 2, a liquid distributor 5 and a liquid column injection device 6 with the lower end communicated and fixed with the liquid distributor 5 are installed below the tail gas inlet 3, the liquid column injection device 6 comprises a plurality of liquid column injectors, a liquid inlet of the liquid distributor 5 is communicated with the bottom end of the absorption tower main body 1 through a circulation pipeline 7, and is used for conveying absorption liquid stored at the bottom in the absorption tower main body 1 to the liquid distributor 5 for distribution, then injecting the absorption liquid into the reverse spray tower 2 through the liquid column injection device 6 for reaction and absorption with the tail gas, and a water pump 7-1 is arranged on the circulation pipeline 7; the lower end of the reverse spray tower 2 is provided with an air guide coil 13, as shown in fig. 2-3, the air guide coil 13 comprises an air guide disc 13-1 and a plurality of air guide tubes 13-2 communicated with the air guide disc 13-1, the periphery of the air guide disc 13-1 is fixedly connected with the inner wall of the reverse spray tower 2, and the air guide tubes 13-2 are immersed in the absorption liquid at the bottom of the absorption tower main body 1 and used for introducing the gas absorbed through the liquid column reaction into the absorption liquid at the bottom of the absorption tower main body 1 for aeration to perform secondary enhanced reaction absorption; as shown in fig. 4-5, a throttle orifice 14 and a demister 9 are sequentially disposed in the absorption tower main body 1 above the connection between the absorption tower main body 1 and the reverse spray tower 2, and are configured to accelerate the gas absorbed by the aeration reaction through the throttle orifice 14 to an optimum demisting speed range, and to demist the gas through the demister 9 and discharge the gas from the tail gas outlet 4.
Further, the air guide plate 13-1 is vertically connected to the inner wall of the reverse spray tower 2, and the air guide pipe 13-2 is immersed in the lower part of the absorption liquid at the bottom of the absorption tower main body 1.
Further, the air guide coil 13 is made of PVC material, the number and the pipe diameter of the air guide pipes 13-2 are adjusted according to the smoke treatment capacity of the liquid column tower, wherein the pipe diameter of the air guide pipes 13-2 is generally set to be 1-5cm, and the number is adjusted according to the size of the air guide plate 13-2.
Furthermore, the orifice plate 14 is made of polypropylene, the thickness of the orifice plate 14 is 3-5cm, the diameter range of the opening is 0.1-1.5mm, and the orifice plate can be adjusted correspondingly according to different used demisters.
Further, a liquid adding port 10 is arranged on the side wall of the absorption tower main body 1 and is used for introducing absorption liquid required by the device for enhancing liquid column tower desulfurization to the bottom of the absorption tower main body 1; the liquid filling port 10 is connected with a liquid filling port valve 10-1 and is used for controlling the feeding of the absorption liquid in the absorption tower main body 1.
Furthermore, a main tower liquid outlet valve 7-2 and an ejector liquid inlet valve 7-3 are sequentially arranged on the circulating pipeline 7 along the water flow direction, and one or more main tower liquid outlet valves 7-2 and one or more ejector liquid inlet valves 7-3 are arranged according to the actual operation requirement; the circulating pipeline 7 is provided with a liquid flowmeter 7-6, and a first pressure gauge 7-4 and a second pressure gauge 7-5 are sequentially arranged along the water flow direction and used for monitoring the flow and the pressure on the circulating pipeline 7; the circulating pipeline 7 is connected with a liquid discharge pipeline 11, and the liquid discharge pipeline 11 is provided with a liquid discharge port valve 11-1 for controlling the discharge of the absorption liquid in the absorption tower main body 1.
Preferably, the liquid discharge line 11 is arranged between the main tower liquid outlet valve 7-2 and the ejector liquid inlet valve 7-3 on the circulation line 7 and between the first pressure gauge 7-4 and the second pressure gauge 7-5, so that the first pressure gauge 7-4 and the second pressure gauge 7-5 are respectively used for monitoring the pressure of the liquid outlet section and the circulation section on the circulation line 7.
Further, the spraying device 8 is connected with an external spraying liquid pipeline, or is connected with a spraying liquid pipeline 12 communicated with the bottom end of the absorption tower main body 1; preferably, the spray liquid pipeline 12 is connected to the circulation pipeline 7, the absorption liquid in the absorption tower main body 1 is used for spraying on the top of the reverse spray tower 2, and the spray liquid pipeline 12 is provided with a spray device valve 12-1 for controlling the feeding of the spray liquid.
The process of strengthening flue gas desulfurization by using the device for strengthening liquid column tower desulfurization by additionally arranging the air guide coil tube sequentially occurs in the reverse spray tower 2 and the absorption tower main body 1, and the method for strengthening flue gas desulfurization specifically comprises the following steps:
tail gas containing sulfur dioxide enters the reverse spray tower 2 from a tail gas inlet 3 of the reverse spray tower 2 through the fan 15, and firstly reacts with small fog drops sprayed by the spraying device 8 at the top end of the reverse spray tower 2; then reacting and absorbing with the liquid column sprayed by the liquid column spraying device 6; the reacted gas is introduced into the absorption liquid in the absorption tower main body 1 from the gas guide coil 13 at the lower part of the reverse spray tower 2 under the pressure of the fan 15 for aeration, secondary reaction absorption is carried out, and meanwhile, the absorption liquid in the reverse spray tower 2 is circulated into the absorption tower main body 1 through the gas guide coil 13; the gas after reaction is accelerated by the throttle orifice 14 and then flows through the demister 9, so as to achieve the optimal demisting effect; the demisted gas is discharged from the tail gas outlet 4. The method ensures that the sulfur-containing tail gas is absorbed by liquid column injection and then is absorbed by secondary aeration, so that the desulfurization efficiency can be greatly improved; and meanwhile, the throttle orifice is additionally arranged, so that the gas flow rate is increased, and the mist content of the outlet gas is lower.
Further, the spraying device 8 generates a large amount of micro fog drops with the diameter of 30-120 μm, and the micro fog drops and the tail gas entering the reverse spraying tower 2 are firstly subjected to primary absorption.
Further, in order to ensure that the absorption liquid smoothly enters the liquid column ejector 6-1 and the liquid column with sufficient height is generated by ejection, a certain pressure needs to be provided by the water pump 7-1, specifically, the water pressure of the water pump 7-1 reaches 0.35Mpa, and the lift is set to be more than 35 m.
Further, the flow rate of the gas after aeration through the gas guiding coil 13 is 0.5-1.0m/s, and the flow rate of the gas after aeration through the orifice plate 14 is increased to 2-4m/s, so that the optimal demisting flow rate range is achieved.
Example 2
SO discharged from a chemical plant is treated by adopting the device and the method for strengthening liquid column tower desulfurization by adding the air guide coil in the embodiment 1 2 The concentration is about 1500mg/m 3 The flow rate of the inlet flue gas of the sulfur-containing flue gas is 100000m 3 And h, wherein the specific structure and parameters in the liquid column tower desulfurization device are set as follows:
the absorbent is sodium hydroxide; the water pressure of the water pump reaches 0.35Mpa, and the lift is set to 35m;
air guide coil pipe adopts the PVC material, the pipe diameter of air duct sets up to 2cm, and quantity is 40, orifice plate adopts the polypropylene material, orifice plate thickness of orifice plate is 4cm, and the trompil diameter is 1.0mm.
Detecting SO discharged from the tail gas outlet after stable operation for several days 2 The results of concentration and alkali consumption are shown in the following table.
Inlet SO 2 Concentration (mg/m) 3 ) Outlet SO 2 Concentration (mg/m) 3 ) Alkali consumption (t/day) Absorption efficiency
Example 2 1495 135 10 90.9％
Comparative examples 1 to 2
The sulfur-containing flue gas of example 2 was treated with the apparatus and method for enhanced liquid column desulfurization described in example 2, and the same inlet flow rate as in example 2 was used, except that the reverse spray tower of comparative example 1 was not equipped with a liquid column spray apparatus, and the apparatus of comparative example 2 was not equipped with a gas guiding coil for aeration and secondary absorption.
Detecting SO discharged from the tail gas outlet after stable operation for several days 2 The results of concentration and alkali consumption are shown in the following table.
Inlet SO 2 Concentration (mg/m) 3 ) Outlet SO 2 Concentration (mg/m) 3 ) Alkali consumption (t/day) Absorption efficiency
Comparative example 1 1492 250 20 83.2％
Comparative example 2 1487 225 18 84.8％
As can be seen from the above table, in SO 2 Example 2 outlet SO with almost identical inlet concentration 2 The concentration is lower than that of comparative examples 1-2, the absorption efficiency is obviously higher than that of comparative examples 1-2, the alkali consumption is also lower than that of comparative examples 1-2, and the SO of example 2 is applied in actual production 2 The tail gas absorption efficiency is high, and the treatment cost is also greatly lower.
Example 3
On the basis of the embodiment 1, a device for enhancing flue gas desulfurization by multi-stage venturi injection is further arranged, and the liquid column injection device 6 is a multi-stage venturi injector, and comprises a first-stage venturi injector 6-1, a second-stage venturi injector 6-2 and a third-stage venturi injector 6-3 as shown in fig. 6-8. The first-stage, second-stage and third-stage Venturi ejectors 6-1, 6-2 and 6-3 of the multistage Venturi ejector 6 are three Venturi ejecting devices with different structures, namely high-jet-column, middle-jet-column and low-jet-column Venturi ejecting devices 6-1, 6-2 and 6-3 respectively, which are used for generating liquid columns and liquid drop sizes with different heights, and are shown in a combined figure 9-10, the Venturi ejecting devices respectively comprise a Venturi liquid inlet 6-4 at the lower end and a Venturi liquid outlet 6-5 at the upper end, and self-suction air inlets 6-6 are arranged on the side walls; the Venturi spraying device comprises a water inlet section 6-7, a mixing section 6-8 and a water outlet section 6-9 which are sequentially communicated, wherein the water inlet section 6-7 and the water outlet section 6-9 are respectively communicated with the Venturi liquid inlet 6-4 and the Venturi liquid outlet 6-5; a throat pipe 6-10 communicated with the mixing section 6-8 is radially arranged on the mixing section 6-8, and the throat pipe 6-10 is communicated with the self-suction inlet 6-6; wherein:
the high jet column Venturi jet device 6-1 is used for generating micro liquid drops, the lengths of the water inlet section 6-7 and the water outlet section 6-9 are adjusted to be 2-5cm according to requirements, the length of the mixing section 6-8 is 3-6cm, the length-diameter ratio of the mixing section 6-8 is 5-7, and the throat diameter of the throat pipe 6-10 is 1-2mm; preferably, two throats 6-10 are arranged on the mixing section 6-8 in a radial direction oppositely, and are used for improving the air suction amount, namely increasing the internal circulation gas amount and simultaneously improving the injection height; the throat gradually-reducing angle alpha of the water inlet section 6-7 and the throat gradually-expanding angle beta of the water outlet section 6-9 are 25-30 degrees.
The middle spray column Venturi injection device 6-2 is used for generating small liquid drops, the lengths of the water inlet section 6-7 and the water outlet section 6-9 are adjusted to be 2-4cm according to requirements, the length of the mixing section 6-8 is 3-5cm, the length-diameter ratio of the mixing section 6-8 is 4-6, and the throat diameter of the throat 6-10 is 3-4mm; preferably, a throat 6-10 is arranged in the radial direction of the mixing section 6-8; the throat gradually-reducing angle alpha of the water inlet section 6-7 and the throat gradually-expanding angle beta of the water outlet section 6-9 are 30-35 degrees.
The low spray column Venturi injection device 6-3 is used for generating large liquid drops, the lengths of the water inlet section 6-7 and the water outlet section 6-9 are adjusted to be 1-3cm according to requirements, the length of the mixing section 6-8 is 2-4cm, the length-diameter ratio of the mixing section 6-8 is 2-4, and the throat diameter of the throat pipe 6-10 is 5-6mm; preferably, a throat 6-10 is arranged in the radial direction of the mixing section 6-8; the throat gradually-reducing angle alpha of the water inlet section 6-7 and the throat gradually-expanding angle beta of the water outlet section 6-9 are 35-40 degrees.
Further, one of the throats 6-10 of the high jet column venturi injection device 6-1, the throat 6-10 of the middle jet column venturi injection device 6-2 and the throat 6-10 of the low jet column venturi injection device 6-3 are arranged in the same direction.
Tail gas entering the reverse spray tower 2 reacts and absorbs with liquid drops sprayed by the first-stage, second-stage and third-stage Venturi ejectors 6-1, 6-2 and 6-3 respectively; the jet height of the liquid column of the multistage Venturi ejector 6 is 0.5-3.5m, the jet height of the liquid column is based on the height of a Venturi liquid outlet of the Venturi ejector, and the jet height is the height of the liquid column, wherein:
the gas-liquid ratio of the primary Venturi ejector 6-1 is 8-10, the ejection height of the liquid column is 2.0-3.5m, the highest position of the liquid column ejection generates fog drops with the diameter of 120-250 mu m, and the generated liquid drops have small particle size and large mass transfer specific surface area, so that the desulfurization process can be enhanced after spraying and absorption;
the gas-liquid ratio of the secondary Venturi ejector 6-2 is 3-5, the ejection height of the liquid column is 1.0-2.5m, the highest position of the liquid column ejection generates small liquid drops with the diameter of 300-550 mu m, and the main mass transfer process of desulfurization in the reverse spray tower 2 is completed in the range;
the gas-liquid ratio of the three-stage Venturi ejector 6-3 is 1-3, the ejection height of the liquid column is 0.5-1.0m, liquid drops with the diameter of 1000-2500 mu m are generated at the highest position of the liquid column ejection, the size of the liquid drops is large, a large number of piece-mounted liquid drops can be generated in the falling process of the liquid column, and the large liquid drops can capture fog drops carried in gas phase and reduce the content of the gas-phase fog.
The multistage venturi ejector 6 is provided with three stages of venturi ejectors with different structures and fixed on the liquid distributor 5 to respectively generate liquid drops with different sizes, so that the turbulence of a flow field in the reverse spray tower 2 is large, the gas-liquid interweaving degree is high, and the height of liquid columns and the size of the liquid drops generated by the three venturi ejectors are controlled by adjusting a liquid flow meter and a pump pressure on a circulating pipeline 7 and matching with different structures of the three venturi ejectors; liquid columns and liquid drops sprayed in the third stage collide in the falling and scattering process, so that new gas-liquid contact surfaces are continuously generated, and mass transfer is enhanced; meanwhile, the self-suction air inlet 6-6 of the Venturi ejector can self-suck tail gas in the tower through negative pressure, so that the tail gas in the tower can be circularly absorbed for many times, and the tail gas absorption efficiency can be greatly improved. The method has sufficient mass transfer, and can greatly reduce the consumption of absorption liquid.
The present application is described in detail for the purpose of enabling those skilled in the art to understand the content of the present application and to implement the same, and the scope of the present application should not be limited thereby.

Claims (10)

1. The utility model provides an install gas guide coil pipe additional and strengthen device of liquid column tower desulfurization, its characterized in that, strengthen device of liquid column tower desulfurization include absorption tower main part and lower extreme and the reverse-spraying tower of absorption tower main part lateral wall intercommunication, wherein:
the upper part of the reverse spray tower is provided with a tail gas inlet which is connected with a fan; the top of the absorption tower main body is provided with a tail gas outlet, and the bottom of the absorption tower main body is used for storing absorption liquid;
a liquid distributor and a liquid column injection device with the lower end communicated with the liquid distributor are arranged below the tail gas inlet in the reverse spray tower, the liquid inlet of the liquid distributor is communicated with the bottom end of the absorption tower main body through a circulating pipeline, and a water pump is arranged on the circulating pipeline;
the lower end of the reverse spray tower is provided with an air guide coil pipe, the air guide coil pipe comprises an air guide disc and a plurality of air guide pipes communicated with the air guide disc, the periphery of the air guide disc is fixedly connected with the inner wall of the reverse spray tower, and the air guide pipes are immersed in the absorption liquid at the bottom of the absorption tower main body and used for introducing the gas absorbed through liquid column reaction into the absorption liquid at the bottom of the absorption tower main body for aeration so as to carry out secondary enhanced reaction absorption.
2. The apparatus for enhancing the desulfurization of a liquid column according to claim 1, wherein the gas guide plate is vertically connected to the inner wall of the reverse spray tower, and the gas guide pipe is immersed in the lower portion of the absorption liquid at the bottom of the absorption tower body.
3. The apparatus of claim 1, wherein the gas-guiding coiled pipe is made of PVC material, and the diameter of the gas-guiding pipe is 1-5cm.
4. The apparatus for enhancing liquid column desulfurization according to claim 1, wherein a throttle orifice and a demister are sequentially disposed in the absorption tower main body above the junction between the absorption tower main body and the reverse spray tower.
5. The device for enhancing the desulfurization of a liquid column according to claim 4, wherein the orifice plate is made of polypropylene, the thickness of the orifice plate is 3-5cm, and the diameter of the opening is 0.1-1.5mm.
6. A method for enhancing desulfurization by using the apparatus for enhancing desulfurization by liquid column according to any one of claims 1 to 3, which comprises the following steps:
tail gas containing sulfur dioxide enters the reverse spray tower from a tail gas inlet of the reverse spray tower through the fan and reacts and absorbs with a liquid column sprayed by the liquid column spraying device; introducing the reacted gas into the absorption liquid in the absorption tower main body from the gas guide coil pipe at the lower part of the reverse spray tower under the pressure of the fan for aeration so as to carry out secondary reaction absorption, and circulating the absorption liquid in the reverse spray tower into the absorption tower main body through the gas guide coil pipe; and gas after the aeration reaction is discharged from the tail gas outlet.
7. The method for enhancing desulfurization according to claim 6, wherein a spraying device is arranged at the top end in the reverse spray tower, the spraying device generates a large amount of micro mist droplets with the diameter of 30-120 μm, and the tail gas entering the reverse spray tower firstly reacts with the small mist droplets sprayed by the spraying device for primary absorption.
8. The method of claim 6, wherein the water pump has a water pressure of 0.35MPa and a head of 35m or more.
9. The method for enhancing desulfurization according to claim 6, wherein a throttle orifice plate and a demister are sequentially arranged in the absorption tower main body above the connection between the absorption tower main body and the reverse spray tower; and the gas after the aeration reaction flows through the demister after the speed of the gas is increased by the throttling orifice plate, and the demisted gas is discharged from the tail gas outlet.
10. The method for enhanced desulfurization according to claim 9, wherein the flow velocity of the gas after aeration through said gas guiding coil is 0.5-1.0m/s, and the flow velocity of the gas after throttling through said orifice plate is increased to 2-4m/s.
CN202211198027.7A 2022-09-29 2022-09-29 Device and method for strengthening liquid column tower desulfurization by additionally arranging air guide coil pipe Pending CN115554830A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211198027.7A CN115554830A (en) 2022-09-29 2022-09-29 Device and method for strengthening liquid column tower desulfurization by additionally arranging air guide coil pipe

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Application Number Priority Date Filing Date Title
CN202211198027.7A CN115554830A (en) 2022-09-29 2022-09-29 Device and method for strengthening liquid column tower desulfurization by additionally arranging air guide coil pipe

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CN115554830A true CN115554830A (en) 2023-01-03

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