CN213492926U - Desulfurizing tower with ultralow emission of flue gas - Google Patents

Abstract

The utility model discloses a desulfurizing tower with ultra-low emission of flue gas, in particular to the technical field of flue gas dust removal, comprising a desulfurizing tower body; a rotational flow desulfurization synergist is welded at the position, higher than the air inlet, of the lower part in the desulfurizing tower body; a spraying layer is arranged above the rotational flow desulfurization synergist; a flat demister is arranged above the spraying layer; a spiral-flow type efficient ultra-clean demister is arranged above the flat demister; through the cooperation of all parts of the desulfurizing tower body, the flue gas desulfurization efficiency is effectively improved, the requirement of flue gas super-purification is met, the ultralow emission target of the desulfurizing tower is realized, and the ultralow emission requirement that the national specified instantaneous value of sulfur dioxide cannot exceed 35mg/m3 is met.

Description

Desulfurizing tower with ultralow emission of flue gas

Technical Field

The utility model relates to a desulfurizing tower especially relates to a desulfurizing tower of ultralow emission of flue gas, belongs to flue gas desulfurization technical field.

Background

The desulfurizing tower is tower equipment for desulfurizing industrial waste gas, and the working process is as follows: the flue gas enters a spray tower cylinder, forms rotational flow with the flue gas through a cyclone at the ascending stage in the spray tower, forms a larger vapor-liquid contact interface with the spray of absorbent slurry, increases the contact time, makes the flue gas fully contact with liquid mist particles in a counter-current manner, absorbs SO2 and catches wet dust particles in the falling process of the mist particles, and the wet dust particles flow downwards to the bottom of the desulfurization tower and are discharged from overflow holes to enter a sedimentation tank. The purified gas rising in the cylinder body is demisted and dehydrated by a demister to complete the whole dedusting and desulfurization procedure, and then is led out through the upper cone part of the cylinder body. And discharging the dust-containing waste liquid into a sedimentation tank through an overflow hole at the bottom of the cylinder, and recycling the filtered slurry.

According to the relevant parameters of sulfur-containing flue gas, most of the desulfurization towers provided by the prior art are three-level spray, two-layer demisters and three-layer backwashing structures. The structure can meet the emission requirement that the instantaneous value of the sulfur dioxide does not exceed 200mg/m3 under any condition specified by the state. However, with the increase of national emission requirements for environmental protection, the emission of sulfur dioxide is required to be controlled within 35mg/m3, and the system obviously cannot meet the requirements.

Therefore, in the technical field of flue gas desulfurization, a desulfurizing tower capable of controlling the emission of sulfur dioxide within 35mg/m3 is needed to completely meet the ultra-low emission requirement specified by the state.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve the problem that exists among the prior art, provide a desulfurizing tower that the flue gas minimum discharged, can control the sulfur dioxide emission within 35mg/m 3.

In order to realize the technical purpose, the technical effect is achieved, the utility model discloses a realize through following technical scheme:

a desulfurizing tower with ultra-low emission of flue gas comprises a desulfurizing tower body; the desulfurization tower body is of a tower-shaped structure, the lower part of the side curved surface of the tower body is provided with an air inlet, the top of the tower body is provided with an air outlet, the bottom of the tower body is also provided with a liquid collecting area, and a zero elevation position at the bottom of the liquid collecting area is provided with a sewage discharge outlet;

a rotational flow desulfurization synergist is welded at the position, higher than the air inlet, of the lower part in the desulfurizing tower body; a spraying layer is arranged above the rotational flow desulfurization synergist; a flat demister is arranged above the spraying layer; a spiral-flow type efficient ultra-clean demister is arranged above the flat demister;

the cyclone desulfurization synergist is formed by mutually welding a plurality of cyclone units in the cross section of the tower body of the desulfurization tower; the cyclone unit comprises an outer cyclone cylinder, an inner cyclone cylinder, blades and a conical blind plate; the inner cyclone cylinder is arranged in the outer cyclone cylinder and forms a concentric annular structure, the conical blind plate is arranged at the position of the circle center, and blades are arranged between the conical blind plate and the inner cyclone cylinder and between the inner cyclone cylinder and the outer cyclone cylinder; the rotational flow desulfurization synergist enables the smoke to be distributed more uniformly and quickly in the rotating process, so that the smoke is in full contact with the slurry, and the reaction efficiency is improved; the design of the tapered plate can greatly reduce resistance and energy consumption;

the synergistic rings welded on the inner wall of the tower body of the desulfurization tower are arranged at adjacent positions below the spraying layer, so that the synergistic rings effectively increase the interaction area of gas phase and liquid phase, ensure sufficient absorption and replacement, effectively prevent the escape of flue gas and reduce the scouring of the spraying layer on the tower wall; the spraying layer comprises a first circulating pipeline, a first connecting flange and a nozzle; the first circulation pipeline comprises a first liquid inlet main pipe and a first bypass pipe connected to the first liquid inlet main pipe through a first connecting flange; the first liquid inlet main pipe and the first bypass pipe are both provided with nozzles made of silicon carbide; the first liquid inlet main pipe is provided with a first liquid inlet; the first circulating pipe is supported by a bracket welded on the inner wall of the tower body of the desulfurizing tower;

demister washing layers are respectively arranged at the upper and lower adjacent positions of the flat demister;

the upper and lower adjacent positions of the spiral-flow type high-efficiency ultra-clean demister are respectively provided with a demister washing layer.

The spiral-flow type high-efficiency ultra-clean demister comprises a ventilation pipe, a turbulent ball, a fixed column, a support grid and a cyclone; the support grid is of a grid structure with the cross section area equal to that of the desulfurization tower body, fixed columns are welded at grid nodes, and ventilation pipes are mounted on the grid; a double-layer coaxial cyclone is arranged in the ventilation pipe, and a turbulent ball is arranged above each layer of cyclone; the cyclone type high-efficiency ultra-clean demister enables smoke airflow rising in the tower to be decomposed into a plurality of small channels, the smoke airflow enters the turbulent ball absorption equipment, the rising smoke forms annular flow, the turbulent ball in the cyclone cavity is driven to rotate and revolve around a central directional shaft, smoke dust in the absorbed smoke dust is gathered on the surface of a ball body to form a liquid film, the smoke dust continuously and continuously brought up along with the smoke dust is increased, and the smoke dust falls into a water drop diversion system through collision gravity settling and finally flows into a liquid collection area at the bottom of the spray tower;

the demister washing layer comprises a second circulating pipeline, a washing nozzle and a second connecting flange; the second circulating pipeline comprises a second liquid inlet main pipe and a second bypass pipe connected to the second liquid inlet main pipe through a second connecting flange; flushing nozzles are arranged on the second liquid inlet main pipe and the second bypass pipe; the second liquid inlet main pipe is provided with a second liquid inlet; and the second circulating pipe is supported by a bracket welded on the inner wall of the tower body of the desulfurizing tower.

Compared with the prior art, the utility model beneficial effect lies in:

the utility model discloses a set up spiral-flow type desulfurization increase ware in the desulfurizing tower body, effectively change the mobile state of going into the tower flue gas. The synergistic ring avoids the flue gas from generating bias flow and short circuit in the tower, firstly, the retention time of the flue gas in the tower is improved, the flue gas is distributed more uniformly in the rotating process, the flue gas is quickly cooled to be in full contact with slurry, the gas, the liquid and the solid are in full contact and react, the high desulfurization efficiency is realized, and the desulfurization efficiency is equivalent to the efficiency of a two-layer spraying layer; and secondly, the liquid/gas ratio (L/G) of the desulfurization system can be effectively reduced, which is about 20-30% lower than that of the empty tower spraying under the same condition, so that the operation cost is reduced. Design and use of the high-efficient ultra-clean defroster of spiral-flow type, the smoke and dust in the flue gas gathers and forms the liquid film on the spheroid surface to increase along with the smoke and dust, finally flow in the collecting region of desulfurizing tower body bottom through collision gravity, thereby improved flue gas desulfurization efficiency, reached gas cleaning's purpose.

Drawings

FIG. 1 is a schematic structural diagram of a desulfurization tower with ultra-low emission of flue gas;

FIG. 2 is a schematic structural view of the swirling flow desulfurization synergist;

FIG. 3 is a schematic structural diagram of the cyclone unit;

FIG. 4 is a schematic view of the structure of the spraying layer;

FIG. 5 is a schematic view of the synergistic ring structure;

FIG. 6 is a schematic cross-sectional view of the synergistic ring;

FIG. 7 is a schematic view of the plate mist eliminator;

FIG. 8 is a schematic top view of the cyclone-type high efficiency ultra-clean demister structure;

FIG. 9 is a schematic side view of the cyclone-type high efficiency ultra-clean demister structure;

FIG. 10 is a schematic diagram of the demister flushing layer structure.

Wherein, 1-air inlet, 2-desulfurizing tower body, 3-cyclone desulfurizing booster, 4-spraying layer, 5-boosting ring, 6-flat demister, 7-cyclone type high-efficiency ultra-clean demister, 8-demister washing layer, 9-air outlet, 31-cyclone unit, 311-outer cyclone cylinder, 312-inner cyclone cylinder, 313-blade, 314-conical blind plate, 4-spraying layer, 41-first circulation pipeline, 42-first connecting flange, 43-nozzle, 411-first main liquid inlet pipe, 412-first bypass pipe, 4111-first liquid inlet, 71-ventilation pipe, 72-turbulence ball, 73-fixing column, 74-supporting grid, 75-cyclone, 81-second circulation pipeline, 83-washing nozzle, 82-a second connecting flange, 811-a second liquid inlet main pipe, 812-a second bypass pipe and 8111-a second liquid inlet.

Detailed Description

The preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are not intended to limit the scope of the invention, but rather, are intended to cover all modifications and equivalents of the claims.

Example 1

Referring to fig. 1, the utility model discloses a desulfurizing tower with ultra-low flue gas emission, which comprises a desulfurizing tower body 2; the desulfurizing tower body 2 is a tower-shaped structure, the bottom of a side curved surface of the tower-shaped structure is provided with an air inlet 1, the top of the tower-shaped structure is provided with an air outlet 9, the bottom of the tower-shaped structure is also provided with a liquid collecting area, and a zero elevation position at the bottom of the liquid collecting area is provided with a sewage outlet;

a rotational flow desulfurization synergist 3 is welded at the position, higher than the air inlet 1, of the lower part in the desulfurization tower body 2; a spraying layer 4 is arranged above the rotational flow desulfurization synergist 3; a flat demister 6 is arranged above the spraying layer 4; a spiral-flow type efficient ultra-clean demister 7 is arranged above the flat demister 6;

it should be noted that, in this embodiment, the spraying layer 4 is provided with three layers, in order to ensure the uniformity of slurry spraying in the absorption tower, the arrangement of the nozzles of the spraying layer 4 is required to be uniform, and a flat demister 6 is arranged above the spraying layer 4 on the uppermost layer to meet a certain coverage rate;

referring to fig. 2, the cyclone desulfurization synergist 3 is formed by welding a plurality of cyclone units 31 in the cross section of the desulfurization tower body 2; referring to fig. 3, the cyclone unit 31 includes an outer cyclone cylinder 311, an inner cyclone cylinder 312, blades 313 and a conical blind plate 314; the inner cyclone cylinder 312 is arranged in the outer cyclone cylinder 311 and forms a concentric annular structure, the conical blind plate 314 is arranged at the position of the circle center, and blades 313 are arranged between the conical blind plate 314 and the inner cyclone cylinder 312 and between the inner cyclone cylinder 312 and the outer cyclone cylinder 311; the rotational flow desulfurization synergist 3 changes the running path of the flue gas in the desulfurization tower body 2, so that the flue gas is more uniformly distributed in the rotating process, the contact area and the contact time of slurry and the flue gas are increased, the mass transfer resistance of a gas-liquid film is reduced, the temperature is rapidly reduced, the optimal reaction temperature is reached, and the reaction process is rapidly completed, so that the desulfurization efficiency is improved, and the aim of purifying the flue gas is fulfilled;

referring to fig. 4-6, the synergistic ring 5 welded on the inner wall of the desulfurization tower body 2 is arranged at the adjacent position below the spraying layer 4, the synergistic ring 5 is in a wedge-shaped ring structure, the interaction area of gas phase and liquid phase is effectively enlarged, sufficient absorption and replacement are ensured, the flue gas can be effectively prevented from escaping, and the scouring of the spraying layer 4 on the tower wall is reduced; the synergistic ring 5 has the main functions of enlarging the interaction area of gas phase and liquid phase, ensuring sufficient absorption and replacement and effectively preventing the flue gas from escaping;

the spraying layer 4 comprises a first circulating pipeline 41, a first connecting flange 42 and a nozzle 43; the first circulation pipeline 41 includes a first liquid inlet main pipe 411 and a first bypass pipe 412 connected to the first liquid inlet main pipe 411 through a first connecting flange 42; the first liquid inlet main pipe 411 and the first bypass pipe 412 are both provided with nozzles 43, and the nozzles are made of silicon carbide; the first liquid inlet main pipe 411 is provided with a first liquid inlet 4111; the first circulating pipeline 41 is supported by a bracket welded on the inner wall of the desulfurizing tower body 2;

the upper and lower adjacent positions of the flat demister 6 are respectively provided with a demister washing layer 8, referring to fig. 7, the flat demister 6 is a circular cross section and is internally provided with a multi-fold corrugated plate; the multi-fold structure of the 6-shaped plate of the flat demister increases the opportunity of mist foam to be captured, and the mist foam which is not removed is captured at the next turning position through the same action, so that the mist foam is repeatedly acted, and the mist removal efficiency is greatly improved;

the upper and lower adjacent positions of the spiral-flow type efficient ultra-clean demister 7 are respectively provided with a demister washing layer 8;

referring to fig. 8 and 9, the swirling type high-efficiency ultra-clean demister 7 comprises a ventilation pipe 71, a turbulent ball 72, a fixed column 73, a support grid 74 and a cyclone 75; the support grid 74 is a grid structure with the cross section area equal to that of the desulfurization tower body 2, fixed columns 73 are welded at grid nodes, and the grids are provided with the ventilation pipes 71; a double-layer coaxial cyclone 75 is arranged in the ventilation pipe 71, and a turbulent ball 72 is arranged above each layer of cyclone 75; the cyclone type high-efficiency ultra-clean demister 7 enables smoke airflow rising in the tower to be decomposed into a plurality of small channels, the smoke airflow enters a turbulent ball 72 absorption device, the rising smoke forms annular flow, the turbulent ball 72 in a cyclone cavity is driven to rotate and revolve around a central directional shaft, smoke dust in the absorbed smoke dust is gathered on the surface of a ball body to form a liquid film, the smoke dust continuously carried by the smoke dust is increased, and the smoke dust is settled by collision gravity and falls into a water drop diversion system and finally flows into a liquid collection area at the bottom of the spray tower;

referring to fig. 10, the demister washing layer 8 includes a second circulation pipe 81, a washing nozzle 83, and a second connection flange 82; the second circulation pipeline 81 comprises a second liquid inlet main pipe 811 and a second bypass pipe 812 connected to the second liquid inlet main pipe 811 through a second connecting flange 82; the second liquid inlet main pipe 811 and the second bypass pipe 812 are both provided with a flushing nozzle 83; the second liquid inlet main pipe 811 is provided with a second liquid inlet 8111; the second circulating pipeline 81 is supported by a bracket welded on the inner wall of the desulfurizing tower body 2;

the utility model discloses the theory of operation: when the desulfurization system operates, flue gas enters from a flue gas inlet 1 of a desulfurization tower body 2, firstly passes through a cyclone desulfurization booster 3, the flue gas flows through a booster ring 5 and a spraying layer 4 after being equalized by the cyclone desulfurization booster 3, when the flue gas passes through the spraying layer 4 and is subjected to gas-liquid contact reaction, the flue gas contains a large amount of mist, when the gas containing the mist flows through a flat demister 6 at a certain speed, due to the inertia impact effect of the gas, the gravity generated by a main channel formed by the mist and a corrugated plate which are condensed due to collision exceeds the resultant force of the rising of the gas and the surface tension of the liquid level, liquid drops are separated from the surface of the corrugated plate, so that the large particles of 500-1000 mu m in the flue gas have 90% removal efficiency, the continuously rising flue gas passes through a cyclone type high-efficiency ultra-clean demister 7, the air flow is decomposed into a plurality of small channels, and then enters, the ascending flue gas forms annular flow through the diversion system, the sphere autorotation in the driving rotational flow cavity and the revolution around the directional axis at the center are driven, the smoke dust in the absorbed flue gas is gathered on the surface of the sphere and forms a liquid film, the smoke dust continuously carried by the flue gas is increased, and the smoke dust falls into the liquid collecting area of the water drop diversion system through collision gravity settling and finally flows into the liquid collecting area of the desulfurizing tower body 2, so that the flue gas desulfurization efficiency is further improved, the requirement of flue gas super-purification is met, the aim of ultralow emission of the desulfurizing tower is fulfilled, and the ultralow emission requirement that the national specified sulfur dioxide emission amount is controlled within 35mg/m3 is met.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and concepts of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides a desulfurizing tower of flue gas minimum emission, includes desulfurizing tower body (2), its characterized in that: a rotational flow desulfurization synergist (3), a spraying layer (4), a flat demister (6) and a rotational flow type efficient ultra-clean demister (7) are arranged inside the desulfurizing tower body (2);

the desulfurizing tower body (2) is a tower-shaped structure, the lower part of a side curved surface of the tower body is provided with an air inlet (1), the top of the tower body is provided with an air outlet (9), the bottom of the tower body is also provided with a liquid collecting area, and a zero elevation position at the bottom of the liquid collecting area is provided with a sewage draining outlet;

a rotational flow desulfurization synergist (3) is welded at the position of the lower part in the desulfurizing tower body (2) higher than the air inlet (1); a spraying layer (4) is arranged above the rotational flow desulfurization synergist (3); a flat demister (6) is arranged above the spraying layer (4); a spiral-flow type efficient ultra-clean demister (7) is arranged above the flat demister (6);

a synergistic ring (5) welded on the inner wall of the desulfurizing tower body (2) is arranged at the adjacent position below the spraying layer (4);

demister washing layers (8) are respectively arranged at the upper and lower adjacent positions of the flat demister (6);

the upper and lower adjacent positions of the spiral-flow type high-efficiency ultra-clean demister (7) are respectively provided with a demister washing layer (8).

2. The desulfurization tower with ultra-low emission of flue gas as recited in claim 1, wherein: the cyclone desulfurization synergist (3) is formed by mutually welding a plurality of cyclone units (31) in the cross section of the desulfurization tower body (2); the cyclone unit (31) comprises an outer cyclone cylinder (311), an inner cyclone cylinder (312), blades (313) and a conical blind plate (314); the inner cyclone cylinder (312) is arranged in the outer cyclone cylinder (311) and forms a concentric annular structure, the conical blind plate (314) is arranged at the position of the circle center, and blades (313) are arranged between the conical blind plate (314) and the inner cyclone cylinder (312) and between the inner cyclone cylinder (312) and the outer cyclone cylinder (311).

3. The desulfurization tower with ultra-low emission of flue gas as recited in claim 1, wherein: the spraying layer (4) comprises a first circulating pipeline (41), a first connecting flange (42) and a nozzle (43); the first circulating pipeline (41) comprises a first liquid inlet main pipe (411) and a first bypass pipe (412) connected to the first liquid inlet main pipe (411) through a first connecting flange (42); the first liquid inlet main pipe (411) and the first bypass pipe (412) are respectively provided with a nozzle (43); the first liquid inlet main pipe (411) is provided with a first liquid inlet (4111).

4. The desulfurization tower with ultra-low emission of flue gas as recited in claim 1, wherein: the cyclone type high-efficiency ultra-clean demister (7) comprises a ventilation pipe (71), a turbulent ball (72), a fixed column (73), a support grating (74) and a cyclone (75); the support grid (74) is of a grid structure with the cross section area equal to that of the desulfurization tower body (2), fixed columns (73) are welded at grid nodes, and the grid is provided with ventilation pipes (71); a double-layer coaxial cyclone (75) is arranged in the ventilation pipe (71), and a turbulent ball (72) is arranged above each layer of cyclone (75).

5. The desulfurization tower with ultra-low emission of flue gas as recited in claim 1, wherein: the demister washing layer (8) comprises a second circulating pipeline (81), a washing nozzle (83) and a second connecting flange (82); the second circulating pipeline (81) comprises a second liquid inlet main pipe (811) and a second bypass pipe (812) connected to the second liquid inlet main pipe (811) through a second connecting flange (82); the second liquid inlet main pipe (811) and the second bypass pipe (812) are respectively provided with a flushing nozzle (83); and the second liquid inlet main pipe (811) is provided with a second liquid inlet (8111).

6. The desulfurization tower with ultra-low emission of flue gas as recited in claim 1, wherein: the nozzle (43) is made of silicon carbide.

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