CN210934109U - Hollow streamline demister - Google Patents

Abstract

The utility model belongs to the technical field of the flue gas defogging, especially, relate to a streamlined defroster of cavity formula, wherein, the defroster includes the slab, and the slab is streamlined, has constituted the flue gas runner between the adjacent slab, and the slab is inside to set up the cooling water pipeline. This neotype defroster has high defogging efficiency.

Description

Hollow streamline demister

Technical Field

The utility model belongs to the technical field of the flue gas defogging, especially, relate to a streamlined defroster of cavity formula.

Background

The demister is one of important devices in a desulfurization system of a coal-fired power plant, has important significance for realizing ultralow emission of the coal-fired power plant, and plays a vital role in corrosion and blockage of downstream equipment and formation of gypsum rain.

The demister of the desulfurization system generally comprises a demister body and a flushing system, the blades are important components of the demister body, and the blades mainly comprise two types of high polymer materials and stainless steel. According to the geometrical shape of the demister blade, the demister can be divided into two shapes of a baffle plate and a corrugated plate. The demister is often divided into three types, i.e., a tubular type, a flat plate type and a ridge type, according to the arrangement form of the demister. At present, the latter two arrangements are mainly applied to practice. The desulfurization system is usually provided with two to three stages of demisters according to the requirement, the first stage demister is mainly used for removing large particles and large water drops, and the second and third stage demisters are mainly used for removing small particles and fine water drops. The defroster is generally arranged at the desulfurizing tower top, also has a few designs to arrange the defroster in desulfurization outlet clean flue.

The desulfurization demister mainly collects fine fog drops under the action of gravity and inertia impact. When smoke containing mist passes through a bent channel of the demister at a certain speed, the movement direction of the smoke is changed rapidly and continuously, the mist in the smoke impacts demister blades under the action of inertia and centrifugal force, and when condensed liquid drops are larger than the resultant force of the rising pulling force of the smoke and the surface tension of the liquid, the liquid drops are separated from the surfaces of the blades and fall into a slurry tank, so that gas-liquid separation is realized. The baffling or corrugated structure that the defroster blade had has increased the probability that the mist foam was caught to defogging efficiency has been improved greatly.

The flat plate type demister is widely used due to its simple structure, convenient installation and maintenance, economy and applicability. Ridge mist eliminators can operate at relatively high temperatures compared to flat mist eliminators. Except for two common demisters, namely a flat plate demister and a ridge demister, some researchers have conducted improvement research aiming at the defects of the two demisters. The electric demister can effectively capture micro water mist, micro dust particles, aerosol and fine metal particles, even dioxin, mercury and the like in the flue gas. At present, the improved demister is mainly simulated by a computer or still stays in a laboratory stage, and reports of relevant practical engineering application are not seen.

In the demister in the prior art, the baffle plate demister is easy to accumulate slurry and dust and scar to cause blockage, and secondary entrainment is caused when the baffle plate is blocked due to easy scarring and blockage so that the flow velocity of a local part is too high. The tubular bundle type demister washing water only has a large number of pipes, the problem of insufficient installation strength can occur, the installation precision is quite required, and if the installation strength is insufficient, the pressure of the washing water is directly insufficient. Affecting the stability of the operation. The demister must be flushed periodically, but too much flushing will disrupt the water balance. In addition, the gaps are small, the channels are narrow, and dust and slurry at the bent positions are difficult to wash.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved by the utility model

The utility model aims at providing a demister solves the problem that above-mentioned defogging is inefficient

Means for solving the technical problem

To the above problem, the utility model provides a defroster.

According to the utility model discloses an embodiment provides a streamlined defroster, and wherein, the defroster includes the slab, and the slab is streamlined, has constituted the flue gas runner between the adjacent slab, and the inside cooling water pipeline that sets up of slab.

In one embodiment, the flue gas flow path is divided into first, second, third and fourth flow-splitting regions.

In one embodiment, barbs are disposed on the sheet.

In one embodiment, the cooling water lines are arranged longitudinally within the demister and the cooling water flows from top to bottom.

In one embodiment, the barbs are arcuate.

In one embodiment, the barbs are disposed on the concave curve of the outer surface of the panel at a slope of 0.

In one embodiment, barbs are disposed at the third and fourth inflection zones.

The beneficial effects of the utility model

The demister sheet adopts a streamline design and is in a shape of a front circle and a rear tip, so that the impact force of the flue gas on the surface of the demister is reduced, and the demister is prevented from deforming; in order to better realize the vapor-liquid separation, barbs are arranged on demister sheets. Can let in the cooling water in the defroster, improve the heat transfer of flue gas and cooling water, thereby reduce the flue gas temperature and thereby make the fine particle in the flue gas take place the steam phase transition and condense and gather and grow up, increase particle fineness and effectively improve defogging efficiency.

Further features of the present invention will become apparent from the following description of exemplary embodiments.

Drawings

FIG. 1 is a plan view showing a partial arrangement of inner plates of a demister.

Fig. 2 is a partially arranged perspective view of an inner plate of the demister.

FIG. 3 is a schematic view of the demister inner sheet cooling water conduit.

Fig. 4 is a demister inner plate size diagram.

Detailed Description

One embodiment of the present disclosure will be specifically described below, but the present disclosure is not limited thereto.

The plate sheet material of the demister of the utility model is fluororesin (for example, polytetrafluoroethylene), and the polytetrafluoroethylene has the characteristics of acid and alkali resistance and various organic solvents resistance and is hardly dissolved in all solvents. Meanwhile, the material has the characteristic of high temperature resistance and extremely low friction coefficient, so the material is taken as an ideal material for a demister.

In the circulation process of flue gas, pressure loss can be produced to the flue gas through the slab front and back, and the system pressure drop is big more, and the energy consumption is higher. Therefore, the sheet is made into a streamline shape, the sheet is made into the shape so as to reduce the vortex action or avoid the formation of the vortex, thereby greatly reducing the resistance of the flue gas to a demister of the flue gas, reducing the energy consumption by reducing the local resistance of the flue gas, and simultaneously increasing the centrifugal force of fine particles in the flue gas due to the improvement of the flow velocity of the flue gas so as to be beneficial to the separation of liquid drops in the flue gas and air.

The cooling water is introduced into the plate from top to bottom, the temperature of the cooling water is about T, the flow rate of the cooling water is u, the temperature of flue gas at the inlet of a normal demister is T, the flow rate of the cooling water can be adjusted according to the temperature and the flow rate of the flue gas inlet, so that the temperature of the flue gas is reduced by △ T (wherein T is ensured to be between 20 and 30 ℃, u is adjusted according to the flow rate and the temperature of the flue gas, △ T is ensured to be between 0.5 and 1 ℃, and T is normally between 45 and 55 ℃), fine particles in the flue gas are subjected to phase change so as to be condensed, steam is condensed on the surfaces of the particles to form a process of nuclear condensation, namely nuclear characteristics, steam is continuously condensed on the surfaces of the formed condensation nuclei to continuously increase the particle size of dust-containing liquid drops, namely, the growth characteristics are obtained.

The utility model discloses a slab adopts streamlined design, the shape of "preceding circle back point" to this reduces the flue gas and to the impact force on defroster surface, prevents that the defroster from warping, slows down the situation that the runner blockked up simultaneously. Divide into first baffling department, second baffling department, third baffling department and fourth baffling department with the passageway in the flue gas stream defroster, can see by figure 4, the dotted line separates four regions respectively. After entering the demister channel, flue gas carrying liquid drops flows along the demister channel direction, the flue gas flow line deflects along with the change of the demister channel direction, the liquid drops carried in the flue gas are separated from the flue gas due to the change of the movement direction under the action of inertia, the liquid drops are adhered to the surface of the plate to form a water film, and the water film slowly flows down after being gathered, so that the separation of the flue gas and the fog drops is realized.

In order to better realize the vapor-liquid separation, installation barbs are arranged on the plate. As shown, the barb arrangement is arranged at a slope of 0 on the outer surface concave curve of the demister sheet. Due to the simple phase change coagulation growth process, ultrafine particles are changed into fine particles, but the fine particles can not be captured by the demister. According to the flow characteristic in the flue gas defroster, the density of liquid drop is greater than the air in the flue gas, and inertia is bigger, therefore the orbit that flows is difficult to receive the influence of defroster runner direction to combine the result that numerical simulation calculates to obtain, synthesize the position that reachs the barb and arrange.

In a specific manner, barbs are installed at the third and fourth flow folds. Because the flue gas velocity of flow is big at the import department to air and liquid droplet have not been separated yet, arrange the barb and can lead to being carried out by the flue gas incoming flow of liquid droplet by the barb is caught, and secondary takes water phenomenon reduces the defogging efficiency of defroster, so arrange the barb in first and second baffling department and to the capture effect of liquid droplet relatively poor. At the third and fourth baffling, particles of different sizes are thus disposed with barbs at the third and fourth baffling to reduce energy consumption of the demister system and improve demisting efficiency.

The barb can furthest acquire condensed liquid drops, and the liquid drops are left along the vertical direction, so that gas-liquid separation is achieved. The size and the dimension of the barb are designed according to the flowing speed of the flue gas and the coal quality of the coal for combustion, the flue gas flow speed is high, the ash content in the coal quality is high, the volatile component is low, and the width of the barb can be properly reduced.

The top view of the demister plate is shown in fig. 4, wherein α, β, h, D, D, c1 and c2 are size parameters of a demister, α is the maximum included angle between a tangent line of a front end curved surface of the plate and a horizontal line and is designed to be 65-75 degrees, β is the maximum included angle between a tangent line of a curved surface of the plate in a second baffling area and the horizontal line and is designed to be 25-35 degrees, h is the height of the curved surface of the plate and can be adjusted according to smoke components, the principle is that h is increased if more fine particles exist in smoke and is reduced if less fine particles exist, D is the thickness of the plate, D is the width of a smoke channel and can be properly increased according to the flow rate and the temperature of the smoke, c1 is the width of the second baffling area and is designed to be 70-80 mm, c2 is the width of a third baffling area and is designed to be 60-70 mm, barbs are designed in an arc shape.

The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. The utility model provides a streamlined defroster which characterized in that, defroster include the slab, and the slab is streamlined, has constituted the flue gas runner between the adjacent slab, and the inside cooling water pipeline that sets up of slab.

2. The mist eliminator as set forth in claim 1, wherein the flue gas flowpath turns are divided into first, second, third and fourth turning zones.

3. A demister as claimed in any one of claims 1-2, wherein the sheets are provided with barbs.

4. A demister as claimed in any one of claims 1-2, wherein the cooling water line is arranged longitudinally within the demister and the cooling water flows from top to bottom.

5. The demister of claim 3, wherein the barb is arcuate.

6. The demister of claim 5, wherein the barbs are disposed on the sheet outer surface concave curve at a slope of 0.

7. The demister of claim 5, wherein barbs are disposed at the third and fourth baffling zones.

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