CN219167941U - High-efficiency gas-liquid separation demister for wet desulfurization tower - Google Patents

Abstract

The utility model discloses a high-efficiency gas-liquid separation demister for a wet desulfurization tower. The device is arranged at the top of the absorption tower and is in a closed tetrahedral structure; comprises a liquid sealing device, a liquid discharging device, a separator support and a vane type separator; the separator support is positioned at the periphery of the vane type separator; the upper end of the liquid discharging device is connected with the vane type separator, and the lower end of the liquid discharging device is connected with the liquid sealing device; the vane separator comprises vanes and a vane box; the blades are vertically arranged in the blade box; the blades are folded; the blades are provided with pocket-shaped protrusions; the blade has a plurality of blades; a plurality of vanes are spaced apart within the vane box. The utility model solves the problem that the wet desulphurization in the prior art has high content of smoke fog drops; the device has the advantages of capability of separating fog drops with the liquid particle size of more than or equal to 8 microns by 100%, simple structure, convenient installation, good separation effect, low pressure drop and low operation cost.

Description

High-efficiency gas-liquid separation demister for wet desulfurization tower

Technical Field

The utility model relates to a high-efficiency gas-liquid separation demister for a wet desulfurization tower.

Background

The wet flue gas desulfurization technology is a gas-liquid reaction, and has the advantages of high reaction speed, high desulfurization efficiency, mature technology and wide application range. Common wet flue gas desulfurization technologies include limestone-gypsum method, sodium-alkali method, ammonia desulfurization, seawater desulfurization, etc. The desulfurization technology is mature and stable, the production operation is reliable, and in a plurality of flue gas desulfurization technologies, the dominant property is always occupied, and the dominant property accounts for more than 80% of the total desulfurization installed amount. Although the wet desulfurization efficiency is higher, the wet desulfurization has the problem of high content of flue gas mist drops, for example, a limestone-gypsum method is easy to form gypsum rain, an ammonia method is easy to form ammonia escape and aerosol during the desulfurization, and the problem of flue gas tailing is serious.

In the prior art, a tubular demister and a ridge type demister are mostly adopted, but the three-stage ridge type demisting effect can only ensure that the particle size of the demisted droplets is more than 20 microns. The fog drop removing effect is improved in a larger space.

In the prior art, mist drops with the particle size of more than 20 microns can be separated, and the separation rate is less than 90%, but in the existing wet flue gas desulfurization technology, mist drops with the particle size of 8-20 microns account for about 50%, and small-particle-size mist drops which cannot be treated in the prior art are important factors for forming the problems of gypsum rain, ammonia escape, aerosol, flue gas tailing and the like.

Therefore, it is necessary to develop a high-efficiency gas-liquid separation mist eliminator for wet desulfurization towers, which efficiently removes mist droplets having a particle diameter of 8 μm or more.

Disclosure of Invention

The utility model aims to provide the high-efficiency gas-liquid separation demister for the wet desulfurization tower, which can separate fog drops with the liquid particle diameter of more than or equal to 8 microns by 100 percent, and has the characteristics of simple structure, convenient installation, good separation effect, low pressure drop and low operation cost; solves the problem of high content of smoke fog drops in wet desulphurization in the prior art.

In order to achieve the above purpose, the technical scheme of the utility model is as follows: a high-efficient gas-liquid separation defroster for wet flue gas desulfurization tower, its characterized in that: the device is arranged at the top of the absorption tower and is in a tetrahedral structure (the device is formed by four-sided blades and a separator support) and is in a closed structure (the periphery of the bottom and the top are all closed);

the high-efficiency gas-liquid separation demister for the wet desulfurization tower comprises a liquid sealing device, a liquid discharging device, a separator support and a vane type separator;

the separator support is positioned at the periphery of the vane type separator;

the upper end of the liquid discharging device is connected with the vane type separator, and the lower end of the liquid discharging device is connected with the liquid sealing device;

the vane separator comprises vanes and a vane box;

the blades are vertically arranged in the blade box;

the blades are folded; the blades are provided with pocket-shaped protrusions to form a rotational flow structure;

the blade has a plurality of blades; a plurality of vanes are arranged in a vane box at intervals; the flue gas cuts into the special structure of the grooves from the side of the separator and is discharged from the top of the separator, and droplets with a diameter of 8 microns and above can be removed by 100%. The liquid trapped by the vane separator is collected in a liquid collecting tank below the vanes, and then is guided to the position below the liquid level through a downcomer; the bottom opening position of the downcomer needs to be completely submerged 100-150mm below the low liquid level to ensure a positive liquid seal. At 100% load, the gas velocity of the flue gas flowing through the separator is not more than 4.5m/s.

Vane-type separation demisters employ a "vane" separating element, which is a novel separating internal member. The blade is made of very thin stainless steel sheet (thickness about 1-10 mm), and the folded steel sheet is provided with a 'pocket' shaped protuberance. When the gas-liquid mixture enters the blade bundle, the gas-liquid mixture can make a zigzag motion (the special meaning here is that adjacent blades are regularly arranged at a certain angle, and each blade is provided with a hook protrusion to form a rotational flow) which changes the direction in the space of the blade bundle in special arrangement, so that the liquid can be separated and slide down to the bottom along the wall of the blade. Meanwhile, when gas encounters pocket-like protrusions of the blades, the gas generates rotational flow in the pocket-like object space, so that tiny liquid drops collide with the pocket-like object wall to be coalesced together and separated from the gas, a low-pressure space area is formed in the pocket-like space due to the rotational flow, a large amount of liquid is collected in the area due to adsorption, and the liquid can slide down, so that the capacity of the blade-type separator for treating the liquid entrainment in the gas is remarkably increased. Because the blades are made of stainless steel sheets, and compared with the traditional internal parts of the gas-liquid separator, the space between the blade assemblies is large enough, and the blockage phenomenon can not occur, the internal parts do not need to be replaced during the service life of the blade-type separator, and the cost is saved.

In the technical scheme, the adjacent blades are regularly arranged at a certain angle, and the distance between the adjacent blades is 20-100mm.

In the technical scheme, the liquid draining device comprises a water collecting tank and a diversion system;

the water collecting tank is positioned at the lower end of the blade box; one end of the diversion system is connected with the water collecting tank, and the other end of the diversion system is connected with the liquid sealing device (the liquid sealing device is positioned below the liquid level of the absorption tower) and directly discharges liquid into the absorption tower.

In the technical scheme, the blades and the blade box are detachably connected, and the blades and the blade box can be freely detached, so that the blades and the blade box are convenient to detach and mount.

In the technical scheme, a separator cleaning system is arranged above the vane type separator;

the separator cleaning system includes a flushing and drainage system. The separator cleaning system is arranged at the upper part of the vane type separator, and can be automatically flushed or manually flushed, the flushing water pump is connected with a safety power supply, the cleaning water pipe of the separator cleaning system is made of corrosion-resistant alloy steel, and the drainage water of the separator cleaning system directly enters the absorption tower.

The liquid sealing device is an inverted U-shaped pipe.

The separator cleaning system employs an automatic flush valve.

The high-efficiency gas-liquid separation demister for the wet desulfurization tower has the following advantages:

(1) The utility model can operate under the load condition of 60% -100% of the boiler; the utility model is provided with the separator cleaning system comprising the flushing and draining structure, which can automatically flush or manually flush, and the flushing water pump is connected with the security power supply; the separator cleaning water pipe is made of corrosion-resistant alloy steel, and the discharged water directly enters the absorption tower; the cleaning system of the separator can automatically and regularly flush, so that the vane type separator is free from scaling, and the separation effect of the vane type separator on fog drops is ensured;

(2) The vane material of the vane type separator can bear high-speed water flow scouring, in particular to high-speed water flow scouring caused by manual flushing;

(3) The utility model realizes high-efficiency separation effect through the vane separator, and can thoroughly remove fog drops with the diameter of 8 micrometers and more;

(4) The vane type separator has small pressure drop, and greatly reduces the operation energy consumption;

(5) The vane separator of the present utility model has a sufficient space between vane members (the interval between vanes is about 20-100 mm) and no clogging phenomenon occurs, so that the vane separator does not need to be replaced with internal parts during its service life.

Drawings

Fig. 1 is an elevation view of the present utility model.

Fig. 2 is a top view of fig. 1.

Fig. 3 is an enlarged view of a portion of a blade in the present utility model.

Fig. 4 is a schematic view showing a structure in which the pocket-like protrusions are provided on the blade in the present utility model.

In the figure, the liquid sealing device is 1-liquid sealing device, the liquid draining device is 2-liquid draining device, the 3-separator support, the 4-blade box, the 5-blade separator, the 5.1-blade and the 5.2-pocket-shaped protrusion are arranged.

Detailed Description

The following detailed description of the utility model is, therefore, not to be taken in a limiting sense, but is made merely by way of example. While making the advantages of the present utility model clearer and more readily understood by way of illustration.

The utility model is now described in detail by taking the utility model as an example for a certain wet flue gas desulfurization project, which has the same guiding function for the application of the utility model to other wet flue gas desulfurization projects.

In this embodiment, an ammonia desulfurization absorber is used for a wet flue gas desulfurization project. The high-efficiency gas-liquid separation demister for the wet desulfurization tower is adopted at the top of the ammonia desulfurization absorption tower, the mixed gas containing free water enters the high-efficiency blade separation part (the gas enters from the outside of the tetrahedron and exits from the inside of the tetrahedron and exits from the top) for high-efficiency gas-liquid separation demisting and defoaming, liquid drops with the size of 8 microns and above are removed, the separated clean gas is discharged from the top, and the separated liquid phase water is directly discharged to the bottom of the separator through a liquid guide pipe (namely a liquid discharge device) and is discharged into the absorption tower through a drain outlet.

The utility model relates to a high-efficiency gas-liquid separation principle of a high-efficiency gas-liquid separation demister for a wet desulfurization tower, which comprises the following steps: the method is realized through inertial momentum collision, flow direction change, surface tension adsorption coalescence and gravity sedimentation, and concretely comprises the following steps: when the gas with mist drops enters the vane separator 5 with the hydrodynamic structure design, the mist drops can forcedly carry out rapid flow direction conversion in the vane beam space with the special flow passage design, and in the process, the mist drops and the vanes are subjected to continuous multiple momentum collision; meanwhile, fluid formed by fog drops can rotate in the space of the special flow passage mechanism of the blade, the rotation radius of the fog drops is rapidly reduced along with the drop of the fog drops, and the fog drops and fog collide with the surface of the blade under the action of surface tension to have larger and larger coalescence effect. Along with the increasing of fog drop adsorption and coalescence, the fog drops are separated from gas, adsorbed and coalesced on the surface of the blade, and collected along a special channel of the blade structure under the action of gravity, flow to a liquid accumulation groove (i.e. a water collecting groove) of the bottom liquid discharging device 2, and then discharged into an absorption tower system through a liquid guide pipe (i.e. a flow guide system) of the liquid discharging device 2 and a liquid sealing structure 1, so that efficient gas-liquid separation is achieved.

The whole separation effect of the embodiment adopting the utility model is as follows: 99% separating liquid of 5-8 microns, 100% separating liquid drops of 8 microns and above, and outlet with liquid clamping amount less than 13.5L/million standard; the whole is maintenance-free, and any internal parts are not required to be replaced; long service life, no movable parts and stable structure.

Other non-illustrated parts are known in the art.

Claims (5)

1. A high-efficient gas-liquid separation defroster for wet flue gas desulfurization tower, its characterized in that: the device is arranged at the top of the absorption tower and is in a closed tetrahedral structure;

the high-efficiency gas-liquid separation demister for the wet desulfurization tower comprises a liquid sealing device (1), a liquid discharging device (2), a separator support (3) and a vane type separator (5);

the separator support (3) is positioned at the periphery of the vane type separator (5);

the upper end of the liquid discharging device (2) is connected with the vane type separator (5), and the lower end is connected with the liquid sealing device (1);

the vane separator (5) comprises vanes (5.1) and a vane box (4); the blades (5.1) are vertically arranged in the blade box (4);

the blade (5.1) is folded; the blades (5.1) are provided with pocket-shaped protrusions (5.2) to form a rotational flow structure;

the blade (5.1) has a plurality of blades; a plurality of blades (5.1) are arranged in a blade box (4) at intervals.

2. The high-efficiency gas-liquid separation mist eliminator for a wet desulfurization tower as claimed in claim 1, characterized in that: adjacent blades (5.1) are regularly arranged at a certain angle, and the distance is 20-100mm.

3. The high-efficiency gas-liquid separation mist eliminator for a wet desulfurization tower according to claim 1 or 2, characterized in that: the liquid draining device (2) comprises a water collecting tank and a flow guiding system;

the water collecting tank is positioned at the lower end of the blade box (4); one end of the diversion system is connected with the water collecting tank, and the other end is connected with the liquid sealing device (1).

4. The high-efficiency gas-liquid separation mist eliminator for a wet desulfurization tower as claimed in claim 3, characterized in that: the blade (5.1) is detachably connected with the blade box (4).

5. The high-efficiency gas-liquid separation mist eliminator for a wet desulfurization tower as claimed in claim 4, characterized in that: a separator cleaning system is arranged above the vane type separator (5).

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