CN219209510U - Device for strengthening sulfuric acid tail gas removal by multi-scale Venturi liquid column injection - Google Patents

Device for strengthening sulfuric acid tail gas removal by multi-scale Venturi liquid column injection Download PDF

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CN219209510U
CN219209510U CN202222597689.3U CN202222597689U CN219209510U CN 219209510 U CN219209510 U CN 219209510U CN 202222597689 U CN202222597689 U CN 202222597689U CN 219209510 U CN219209510 U CN 219209510U
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liquid
venturi
tail gas
throat
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吴涛
刘博�
杨强
袁方
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East China University of Science and Technology
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Abstract

The utility model provides a device for strengthening sulfuric acid tail gas removal by multi-scale Venturi liquid column injection, which comprises an absorption tower main body and a reverse spraying tower, wherein the lower end of the reverse spraying tower is communicated with the absorption tower main body, the upper part of the reverse spraying tower is provided with a tail gas inlet, the top of the reverse spraying tower is provided with a spraying device, the top of the absorption tower main body is provided with a tail gas outlet, and a liquid distributor and a multi-stage Venturi ejector are arranged in the reverse spraying tower; sulfuric acid tail gas enters the reverse spray tower to be reacted and absorbed with liquid drops with different scales sprayed by the primary venturi ejectors, the secondary venturi ejectors and the tertiary venturi ejectors respectively, and part of the tail gas is self-absorbed by negative pressure and enters the venturi ejectors at each stage to form self-circulation of the tail gas; and the tail gas after the reaction enters the absorption tower main body and is discharged. The flow field in the reverse spray tower is turbulent, the gas-liquid interweaving degree is high, the liquid column and the liquid drop sprayed in the three stages collide in the falling and scattering process, gas-liquid contact with new surfaces is continuously generated, and mass transfer is enhanced; meanwhile, the tail gas in the tower is self-absorbed by the negative pressure of the Venturi ejector, and the tail gas is absorbed in a circulating way for multiple times, so that the tail gas absorption efficiency is greatly improved.

Description

Device for strengthening sulfuric acid tail gas removal by multi-scale Venturi liquid column injection
Technical Field
The utility model belongs to the technical field of flue gas desulfurization, and particularly relates to a device for strengthening sulfuric acid tail gas removal by multi-scale Venturi liquid column injection.
Background
SO 2 Is one of the most common pollutants in the atmosphere, and with the continuous development of industry, SO 2 And the discharge amount of (c) tends to increase. The emission of a large amount of sulfur dioxide gas causes the aggravation of acid rain, and not only can seriously harm the natural environment, but also can directly influence the physical health of people. If the soil and water can not be effectively treated, the acidification of the soil and water can be aggravated, the ecological balance is destroyed, and the biodiversity is affected.
With the enhancement of environmental awareness and the popularization of environmental regulations, most sulfuric acid enterprises in China increase the investment force on sulfuric acid tail gas treatment, and the liquid column desulfurization tower focuses on the advantages of full gas-liquid mass transfer and higher desulfurization efficiency.
CN202983508U discloses a multi-stage multi-scale spray device for liquid column tower, which is characterized in that spray nozzles with different types and heights are arranged in the absorption tower, multiple layers of dense liquid drop layers with increased particle size are sequentially formed in the tower body space, and although the desulfurization efficiency of the technology is improved compared with that of a conventional single-stage liquid column desulfurization tower, the flue gas absorbed by the technology has higher content of mist at the outlet, the load of a subsequent demister is increased, the positive effect on energy conservation and consumption reduction is not great, and the desulfurization efficiency is further improved.
CN108579396a discloses a device and a method for desulfurizing flue gas, the device comprises an absorption tower body; the lower part of the absorption tower body is provided with a smoke inlet, and the top of the absorption tower body is provided with a smoke outlet; the slurry circulating device, the liquid column spraying device, the high-efficiency atomizing spraying device and the demisting device are sequentially arranged from bottom to top; the liquid column spraying device is arranged above the flue gas inlet and comprises a plurality of liquid column spraying branch pipes, the bottom end of each liquid column spraying branch pipe is communicated with the slurry circulating device, and the top end of each liquid column spraying branch pipe is provided with a liquid column spraying nozzle; the method has the characteristic of high desulfurization efficiency, but the liquid absorption amount is increased, the alkali consumption is higher, and in actual industry, the cost of the liquid absorption is large in proportion to the liquid column tower, so that the method is low in practical industrial economy.
Therefore, the liquid column alkaline washing tower in the prior art still has the problems of insufficient absorption efficiency, incapability of direct discharge, high alkaline consumption and the like. The device for removing the sulfuric acid tail gas with higher efficiency and low alkali consumption is developed, and has great significance for the field of environmental protection and realizing the national 'carbon neutralization' strategy.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provides a device for strengthening sulfuric acid tail gas removal by multi-scale Venturi liquid column injection. By arranging three Venturi ejectors with different structures, liquid drops with different dimensions are generated, so that turbulence of an internal flow field in the tower is large, and the gas-liquid interweaving degree is high; meanwhile, the Venturi air suction port can directly suck tail gas in the tower through negative pressure, so that the tail gas in the tower can be circularly absorbed for multiple times, and the tail gas absorption efficiency is greatly improved.
The utility model is realized by the following technical scheme:
the device for strengthening sulfuric acid tail gas removal by multi-scale Venturi liquid column injection comprises an absorption tower main body and a reverse spraying tower, wherein the lower end of the reverse spraying tower is communicated with the side wall of the absorption tower main body, the upper part of the reverse spraying tower is provided with a tail gas inlet, the top of the absorption tower main body is provided with a tail gas outlet, and the bottom end of the absorption tower main body is used for storing absorption liquid; a spraying device is arranged at the inner top end of the reverse spraying tower; the utility model discloses a reverse spray tower, including the back spray tower, be located in the tail gas import below install liquid distributor and lower extreme with the multistage venturi sprayer of liquid distributor intercommunication, multistage venturi sprayer is including the one-level, second grade and tertiary venturi sprayer that are used for producing liquid column and the liquid drop size of different height, liquid distributor's inlet with the bottom of absorption tower main part is through circulation pipeline intercommunication, be used for carrying the absorption liquid that stores in the absorption tower main part to liquid distributor distributes the back pass through multistage venturi sprayer spray the liquid drop in reverse spray tower is interior with tail gas reaction absorption, be equipped with the water pump on the circulation pipeline.
The utility model further provides that the first-stage venturi ejector, the second-stage venturi ejector and the third-stage venturi ejector of the multi-stage venturi ejector are venturi ejectors with three different structures, namely high-spray-column venturi ejectors, medium-spray-column venturi ejectors and low-spray-column venturi ejectors. The venturi spraying devices comprise a venturi liquid inlet at the lower end and a venturi liquid outlet at the upper end, and self-priming air inlets are arranged on the side walls of the venturi spraying devices; the venturi spraying device comprises a water inlet section, a mixing section and a water outlet section which are sequentially communicated, wherein the water inlet section and the water outlet section are respectively communicated with the venturi liquid inlet and the venturi liquid outlet; the radial direction of the mixing section is provided with a throat pipe communicated with the mixing section, and the throat pipe is communicated with the self-priming air inlet; wherein:
the high spray column venturi jet device is used for generating tiny liquid drops, the lengths of the water inlet section and the water outlet section are adjusted to be 2-5cm according to requirements, the length of the mixing section is 3-6cm, the length-diameter ratio of the mixing section is 5-7, and the throat diameter of the throat pipe is 1-2mm; preferably, the mixing section is provided with two throats in radial opposition; the throat taper angle alpha of the water inlet section and the throat taper angle beta of the water outlet section are 25-30 degrees.
The middle spray column venturi jet device is used for generating small liquid drops, the lengths of the water inlet section and the water outlet section are adjusted to be 2-4cm according to requirements, the length of the mixing section is 3-5cm, the length-diameter ratio of the mixing section is 4-6, and the throat diameter of the throat pipe is 3-4mm; preferably, a throat is arranged in the radial direction of the mixing section; the throat taper angle alpha of the water inlet section and the throat taper angle beta of the water outlet section are 30-35 degrees.
The low spray column venturi jet device is used for generating large liquid drops, the lengths of the water inlet section and the water outlet section are adjusted to be 1-3cm according to requirements, the length of the mixing section is 2-4cm, the length-diameter ratio of the mixing section is 2-4, and the throat diameter of the throat pipe is 5-6mm; preferably, a throat is arranged in the radial direction of the mixing section; the throat taper angle alpha of the water inlet section and the throat taper angle beta of the water outlet section are 35-40 degrees.
The utility model is further characterized in that a demister is arranged in the absorption tower main body and above the joint of the absorption tower main body and the reverse spray tower and is used for discharging the gas absorbed by the reverse spray tower reaction from the tail gas outlet after entering the absorption tower main body and demisting by the demister.
The utility model is further provided that the side wall of the absorption tower main body is provided with a liquid adding port for introducing the absorption liquid required by the sulfuric acid tail gas removal device reaction to the bottom of the absorption tower main body; the liquid adding port is connected with a liquid adding port valve and is used for controlling the feeding of the absorption liquid in the absorption tower main body.
The utility model is further arranged that the spraying device is connected with an external spraying liquid pipeline or is connected with the spraying liquid pipeline communicated with the bottom end of the absorption tower main body; preferably, the spray liquid pipeline is connected with the circulating pipeline, the absorption liquid in the absorption tower body is used for spraying on the top of the reverse spray tower, and a spray device valve is arranged on the spray liquid pipeline and used for controlling the feeding of the spray liquid.
The utility model is further provided with a main body tower liquid outlet valve and a venturi liquid inlet valve which are sequentially arranged on the circulating pipeline along the water flow direction, and one or more main body tower liquid outlet valves and one or more venturi liquid inlet valves are arranged according to actual operation requirements; 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 are used for monitoring the flow and the pressure on the circulating pipeline; the circulating pipeline is connected with a liquid discharge pipeline, and a liquid discharge port valve is arranged on the liquid discharge pipeline and used for controlling the discharge of the absorption liquid in the absorption tower main body.
The utility model is further arranged that the liquid discharge pipeline is arranged between the main body tower liquid outlet valve and the Venturi liquid inlet valve 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.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a device for strengthening sulfuric acid tail gas removal by multi-scale Venturi liquid column injection, wherein three-stage Venturi ejectors with different structures are arranged in a reverse spray tower section of the device, and the Venturi ejectors are fixed on a liquid distributor, so that liquid columns with different heights and liquid drop sizes are respectively generated, the turbulence of a flow field in the reverse spray tower is large, and the gas-liquid interweaving degree is high; the liquid column and the liquid drop sprayed by the three stages collide in the falling and scattering process, so that gas-liquid contact with a new surface is continuously generated, and mass transfer is enhanced; meanwhile, the self-suction air inlet 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 multiple times, the self-circulation of the tail gas in the reverse spraying tower is formed, and the tail gas absorption efficiency can be greatly increased. The method for removing the sulfuric acid tail gas has sufficient mass transfer, so that the consumption of the absorption liquid can be greatly reduced.
Compared with a common liquid column tower, the multi-scale venturi liquid column spraying device can realize multi-stage multi-scale spraying liquid drop circulation desulfurization, and has the advantages of high desulfurization efficiency, good desulfurization effect, less consumption of absorption liquid and the like.
Drawings
FIG. 1 is a schematic diagram of a process flow for enhancing sulfuric acid tail gas removal by multi-scale Venturi liquid column injection according to the present utility model;
FIG. 2 is a schematic diagram of a multistage venturi jet droplet according to the present utility model;
FIG. 3 is a cross-sectional view of the A-A side of the reverse spray tower of the present utility model;
FIG. 4 is a schematic view showing the external structure of the venturi injector according to the present utility model;
FIG. 5 is a cross-sectional view of the internal structure of the venturi injector according to the present utility model;
wherein, 1-the main body of the absorption tower; 2-a reverse spraying tower; 3-a tail gas inlet; 4-a tail gas outlet; a 5-liquid distributor; 6-multistage venturi ejectors; 6-1 stage venturi ejector; a 6-2 secondary venturi eductor; 6-3 three stage venturi ejectors; 6-4 venturi liquid inlets; 6-5 venturi outlets; 6-6, self-priming air inlet; 6-7 water inlet sections; 6-8 mixing sections; 6-9 water outlet sections; 6-10 throats; 7-a recycle line; 7-1 water pump; 7-2 a main body tower liquid outlet valve; 7-3 venturi liquid inlet valve; 7-4 a first pressure gauge; 7-5 second pressure gauge; 7-6 liquid flow meter; 8-spraying device; 9-a demister; 10-a liquid adding port; 10-1 liquid filling port valve; 11-a drain line; 11-1 liquid outlet valve; 12-a spray liquid pipeline; 12-1 spray device valve.
Detailed Description
The present utility model is described in further detail below with reference to examples. It is to be understood that the following examples are given solely for the purpose of illustration and are not to be construed as limitations on the scope of the utility model, as will be apparent to those skilled in the art upon examination of the following, and many other non-essential modifications and adaptations of the utility model may be made without departing from its scope.
Example 1
The utility model relates to a device for strengthening sulfuric acid tail gas removal by multi-scale Venturi liquid column injection, which is shown in figure 1, and comprises an absorption tower main body 1 and a reverse spraying tower 2, wherein the lower end of the reverse spraying tower 2 is communicated with the side wall of the absorption tower main body 1, the upper part of the reverse spraying tower 2 is provided with a tail gas inlet 3, the top of the absorption tower main body 1 is provided with a tail gas outlet 4, and the bottom end of the absorption tower main body 1 is used for storing absorption liquid; the top end in the reverse spray tower 2 is provided with a spray device 8 for spraying small fog drops to react with tail gas which just enters the reverse spray tower 2; referring to fig. 2-3, in the reverse spray tower 2, a liquid distributor 5 and a multi-stage venturi injector 6 with the lower end fixedly connected with the liquid distributor 5 are installed below the tail gas inlet 3, the multi-stage venturi injector 6 comprises a primary venturi injector 6-1, a secondary venturi injector 6-2 and a tertiary venturi injector 6-3, 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 the absorption liquid stored in the absorption tower main body 1 to the liquid distributor 5 for distribution, then spraying liquid drops in the reverse spray tower 2 through the multi-stage venturi injector 6 for reaction absorption with the tail gas, and the circulation pipeline 7 is provided with a water pump 7-1; the demister 9 is arranged above the joint of the absorption tower body 1 and the reverse spraying tower 2 in the absorption tower body 1, and is used for discharging the gas which is subjected to reaction absorption by the reverse spraying tower 2 from the tail gas outlet 4 after entering the absorption tower body 1 and being demisted by the demister 9.
Further, the first-stage, second-stage and third-stage venturi ejectors 6-1, 6-2 and 6-3 of the multi-stage venturi ejector 6 are venturi ejector devices with three different structures, namely high-jet column, middle-jet column and low-jet column venturi ejector devices 6-1, 6-2 and 6-3 respectively, which are used for generating liquid columns and liquid drop sizes with different heights, and as shown in fig. 4-5, the venturi ejector devices all 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 jet 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 a venturi liquid inlet 6-4 and a venturi liquid outlet 6-5; the radial direction of the mixing section 6-8 is provided with a throat pipe 6-10 communicated with the mixing section 6-8, and the throat pipe 6-10 is communicated with the self-priming air inlet 6-6; wherein:
the high spray column venturi jet device 6-1 is used for generating tiny 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, the mixing sections 6-8 are provided with two throats 6-10 in radial opposition for increasing the amount of suction, i.e. the amount of internal recycle gas, while increasing the injection height; the throat taper angle alpha of the water inlet section 6-7 and the throat taper angle beta of the water outlet section 6-9 are 25 degrees to 30 degrees.
The middle spray column venturi jet 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 pipe 6-10 is 3-4mm; preferably, the radial direction of the mixing section 6-8 is provided with a throat pipe 6-10; the throat taper angle alpha of the water inlet section 6-7 and the throat taper angle beta of the water outlet section 6-9 are 30-35 degrees.
The low spray column venturi jet 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, the radial direction of the mixing section 6-8 is provided with a throat pipe 6-10; the throat taper angle alpha of the water inlet section 6-7 and the throat taper 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 jet device 6-1 is arranged in the same direction as the throat 6-10 of the middle jet column venturi jet device 6-2 and the throat 6-10 of the low jet column venturi jet device 6-3.
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 sulfuric acid tail gas removal device reaction to the bottom of the absorption tower main body 1; the liquid adding port 10 is connected with a liquid adding port valve 10-1 for controlling the feeding of the absorption liquid in the absorption tower main body 1.
Further, a main body tower liquid outlet valve 7-2 and a venturi liquid inlet valve 7-3 are sequentially arranged on the circulating pipeline 7 along the water flow direction, and one or more main body tower liquid outlet valves 7-2 and one or more venturi liquid inlet valves 7-3 are arranged according to actual operation requirements; 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 are 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 discharge of the absorption liquid in the absorption tower main body 1.
Preferably, the drain line 11 is disposed between the main body tower outlet valve 7-2 and the venturi inlet valve 7-3 on the circulation line 7 and between the first pressure gauge 7-4 and the second pressure gauge 7-5, such that the first pressure gauge 7-4 and the second pressure gauge 7-5 are used to monitor the pressure of the liquid outlet section and the circulation section on the circulation line 7, respectively.
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 spraying liquid pipeline 12 is connected with the circulating pipeline 7, the absorption liquid in the absorption tower body 1 is used for spraying at the top of the reverse spraying tower 2, and a spraying device valve 12-1 is arranged on the spraying liquid pipeline 12 and used for controlling the feeding of the spraying liquid.
The process of strengthening the sulfuric acid tail gas removal by utilizing the sulfuric acid tail gas removal device all occurs in the reverse spraying tower 2, and the method for strengthening the sulfuric acid tail gas removal is specifically as follows:
sulfuric acid tail gas enters the reverse spray tower 2 from a tail gas inlet 3 of the reverse spray tower, and reacts with small fog drops sprayed by a spraying device 8 at the top end of the reverse spray tower 2; then respectively reacting and absorbing with the liquid drops ejected by the primary, secondary and tertiary venturi ejectors 6-1, 6-2 and 6-3; the reacted gas enters the absorber main body 1 from the lower part of the reverse spray tower 2, passes through the demister 9, and is discharged from the tail gas outlet 4.
Specifically, the multistage venturi ejectors 6 respectively generate liquid drops with different dimensions by arranging three stages of venturi ejectors with different structures, which are fixed on the liquid distributor 5, so that the turbulence of the flow field in the reverse spray tower 2 is large, the gas-liquid interleaving degree is high, and the heights and the liquid drop sizes of liquid columns generated by the three venturi ejectors are controlled by adjusting the liquid flowmeter and the pump pressure on the circulating pipeline 7 and matching with different structures of the three stages of venturi ejectors; the liquid column and the liquid drop sprayed by the three stages collide in the falling and scattering process, so that gas-liquid contact with a new surface is 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 multiple times, and the tail gas absorption efficiency can be greatly improved. The method has sufficient mass transfer, and can greatly reduce the consumption of the absorption liquid.
Further, 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 the 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 mass transfer specific surface area is large due to the small particle size of the generated liquid drops, 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 jet tower 2 is completed in the range;
the three-stage Venturi ejector 6-3 has the gas-liquid ratio of 1-3, the ejection height of the liquid column is 0.5-1.0m, the highest position of the liquid column ejection generates liquid drops with the diameter of 1000-2500 mu m, the liquid drops have large size, a large number of sheet-mounted liquid drops can be generated in the falling process of the liquid column, and the large liquid drops can capture fog drops entrained in gas phase and reduce the gas phase fog content.
Further, the spraying device 8 generates a large number of tiny mist droplets with the diameter of 50-100 mu m, and the tiny mist droplets and the tail gas entering the reverse spraying tower 2 are primarily absorbed first.
Further, in order to ensure that the absorption liquid smoothly enters the multistage venturi ejector 6 and to generate the jet liquid column of the height range, a certain pressure is required to be provided by the water pump 7-1, specifically, the head of the water pump 7-1 is set to 20m or more.
Example 2
SO discharged from a chemical plant was treated by the sulfuric acid tail gas removal apparatus and method described in example 1 2 The concentration is about 1500mg/m 3 Is characterized in that the flow of the sulfuric acid tail gas of the inlet is 50000m 3 And/h, wherein specific structures and parameters in the sulfuric acid tail gas removal device are as follows:
the absorbent is sodium hydroxide; the lift of the water pump is set to be 20m;
the lengths of the water inlet section and the water outlet section of the high spray column venturi jet device are 5cm; the length of the mixing section is 5cm, and the length-diameter ratio is 6; the throat diameter of the throat pipe is 2mm; the throat taper angle alpha of the water inlet section is 25 degrees, and the throat taper angle beta of the water outlet section is 25 degrees;
the lengths of the water inlet section and the water outlet section of the middle spray column venturi spraying device are 4cm; the length of the mixing section is 5cm, the length-diameter ratio is 5, and the throat diameter of the throat pipe is 3mm; the throat taper angle alpha of the water inlet section is 30 degrees, and the throat taper angle beta of the water outlet section is 30 degrees;
the lengths of the water inlet section and the water outlet section of the low spray column venturi jet device are 2cm; the length of the mixing section is 3cm, the length-diameter ratio is 2-4, and the throat diameter of the throat is 5-6mm; the throat taper angle alpha of the water inlet section is 35 degrees, and the throat taper angle beta of the water outlet section is 35 degrees.
Stable operation for several days and detection of SO exhausted from tail gas outlet 2 Concentration and alkali consumption, and the results 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 1493 153 12 89.8％
Comparative example 1
The flue gas treatment device of a Nanjing chemical plant is used as a comparative example, the same sulfuric acid tail gas is treated by the same inlet flow as in the embodiment 2, the tail gas treatment system comprises a tail gas absorption tower, a water washing tower, a two-stage electric demister and other devices, the tail gas absorption tower is a traditional liquid column tower, and a traditional nozzle injection mode is adopted.
Stable operation for several days and detection of SO exhausted from tail gas outlet 2 Concentration and alkali consumption, and the results 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 1486 200 16 86.5％
As can be seen from the above table, in SO 2 Example 2 outlet SO at almost the same inlet concentration 2 The concentration is lower than that of comparative example 1, the absorption efficiency is obviously higher than that of comparative example 1, the alkali consumption is lower than that of comparative example 1, and meanwhile, the concentration of comparative example 1 can reach the standard after passing through a secondary water washing tower and is not higher than 200mg/m 3 Thus in actual productionSO of application example 2 2 The tail gas absorption treatment cost is greatly lower.
Comparative example 2
The sulfuric acid off-gas removal apparatus and method described in example 2 was used to treat sulfuric acid off-gas and the same inlet flow rate as in example 2 was used, except that the ejector used for the liquid column ejection was not a venturi ejector, but a conventional liquid column nozzle of the same specification. Stable operation for several days and detection of SO exhausted from tail gas outlet 2 Concentration and alkali consumption, and the results 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 2 1491 186 17 86.7％
As can be seen from the above table, in SO 2 Example 2 outlet SO at almost the same inlet concentration 2 The concentration is lower than that of comparative example 2, the absorption efficiency is significantly higher than that of comparative example 2, and the alkali consumption is lower than that of comparative example 2, so that in practiceApplication of SO of example 2 in production 2 The tail gas absorption treatment cost is greatly lower.
The present application is described in detail for the purpose of enabling those skilled in the art to understand the contents of the present application and to implement the same, and is not limited in scope by the present application, and all equivalent changes or modifications made according to the spirit of the present application should be covered in the scope of the present application.

Claims (10)

1. The utility model provides a device of intensive sulfuric acid tail gas desorption is sprayed to multiscale venturi liquid column, its characterized in that, the device of intensive sulfuric acid tail gas desorption include absorption tower main part and lower extreme with the contrary tower that spouts of absorption tower main part lateral wall intercommunication, wherein:
the top of the absorption tower main body is provided with a tail gas outlet, and the bottom end of the absorption tower main body is used for storing absorption liquid;
a spraying device is arranged at the inner top end of the reverse spraying tower;
in the contrary tower that spouts, be located tail gas import below install liquid distributor and lower extreme with the multistage venturi sprayer of liquid distributor intercommunication, multistage venturi sprayer is including being used for producing the liquid column of different height and the one-level, second grade and tertiary venturi sprayer of liquid drop size, liquid distributor's inlet with the bottom of absorption tower main part is through circulating line intercommunication, be equipped with the water pump on the circulating line.
2. The apparatus for enhanced sulfuric acid tail gas removal as claimed in claim 1, wherein the primary, secondary and tertiary venturi ejectors of the multi-stage venturi ejectors are respectively high-jet column, medium-jet column and low-jet column venturi ejectors.
3. The device for strengthening sulfuric acid tail gas removal according to claim 2, wherein the venturi spraying devices comprise a venturi liquid inlet at the lower end and a venturi liquid outlet at the upper end, the side walls are provided with self-suction air inlets, the inside of the venturi spraying devices comprise a water inlet section, a mixing section and a water outlet section which are sequentially communicated, the water inlet section and the water outlet section are respectively communicated with the venturi liquid inlet and the venturi liquid outlet, a throat pipe communicated with the mixing section is arranged in the radial direction of the mixing section, and the throat pipe is communicated with the self-suction air inlets.
4. The apparatus for enhancing sulfuric acid tail gas removal as claimed in claim 3, wherein the high-spray column venturi jet apparatus is used for generating tiny liquid drops, the lengths of the water inlet section and the water outlet section are 2-5cm, the lengths of the mixing section are 3-6cm, the length-diameter ratio of the mixing section is 5-7, and the throat taper angle α of the water inlet section and the throat taper angle β of the water outlet section are 25 ° -30 °.
5. The apparatus for enhancing sulfuric acid tail gas removal as claimed in claim 3, wherein the venturi jet device of the middle jet column is used for generating small liquid drops, the lengths of the water inlet section and the water outlet section are 2-4cm, the lengths of the mixing section are 3-5cm, the length-diameter ratio of the mixing section is 4-6, and the throat taper angle alpha of the water inlet section and the throat taper angle beta of the water outlet section are 30 ° -35 °.
6. The apparatus for enhancing sulfuric acid tail gas removal as claimed in claim 3, wherein the low spray column venturi jet apparatus is used for generating large droplets, the lengths of the water inlet section and the water outlet section are 1-3cm, the length of the mixing section is 2-4cm, the length-diameter ratio of the mixing section is 2-4, and the throat taper angle α of the water inlet section and the throat taper angle β of the water outlet section are 35 ° -40 °.
7. The device for strengthening sulfuric acid tail gas removal according to claim 3, wherein two throats are arranged in the radial direction of the mixing section of the high-spray column venturi jet device, and the throat diameter of the throats is 1-2mm; a throat is arranged in the radial direction of the mixing section of the middle spray column venturi jet device, and the throat diameter of the throat is 3-4mm; a throat is arranged in the radial direction of the mixing section of the low spray column venturi jet device, and the throat diameter of the throat is 5-6mm.
8. The enhanced sulfuric acid tail gas removal unit of claim 1, wherein the spray unit is connected to a spray liquid line, the spray liquid line being connected to the circulation line.
9. The apparatus for enhancing sulfuric acid tail gas removal as claimed in claim 1, wherein a demister is provided in the absorber main body above a junction between the absorber main body and the reverse spray tower.
10. The apparatus for enhancing sulfuric acid tail gas removal as claimed in claim 1, wherein a liquid filling port is provided on a side wall of the absorption tower main body, and the liquid filling port is connected with a liquid filling port valve.
CN202222597689.3U 2022-09-29 2022-09-29 Device for strengthening sulfuric acid tail gas removal by multi-scale Venturi liquid column injection Active CN219209510U (en)

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CN202222597689.3U CN219209510U (en) 2022-09-29 2022-09-29 Device for strengthening sulfuric acid tail gas removal by multi-scale Venturi liquid column injection

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Application Number Priority Date Filing Date Title
CN202222597689.3U CN219209510U (en) 2022-09-29 2022-09-29 Device for strengthening sulfuric acid tail gas removal by multi-scale Venturi liquid column injection

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CN219209510U true CN219209510U (en) 2023-06-20

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