CN212403527U

CN212403527U - Flue gas treatment system

Info

Publication number: CN212403527U
Application number: CN202021599393.XU
Authority: CN
Inventors: 贾伟华; 赵鹏飞; 党永清
Original assignee: Inner Mongolia Gaoyuanlan Energy Saving And Environmental Protection Technology Co ltd
Current assignee: Inner Mongolia Gaoyuanlan Energy Saving And Environmental Protection Technology Co ltd
Priority date: 2020-08-01
Filing date: 2020-08-01
Publication date: 2021-01-26
Anticipated expiration: 2030-08-01

Abstract

The utility model relates to a flue gas treatment system, which comprises a cloth-bag electric precipitator, an induced draft fan, a dust-removing, mist-removing and desulfurizing tower, and a discharge chimney, which are connected in sequence; The defogging section is equipped with a tube bundle type dust collector and a defogger with a baffle plate, and the baffle plate demister is arranged 1-1.8m above the tube bundle type dust collector and demister. The utility model can make use of the existing wet desulfurization tower for renovation, and the construction is fast; the bag electrostatic precipitator, the tube bundle centrifugal cyclone dust removal and fog removal, and the baffle plate fog removal are optimized and coupled, and the desulfurization tower gas distribution plate and the tube bundle are removed from the fog. The cyclone of the device, the baffle plate of the baffle plate defogger and other structures are modified, which can eliminate the secondary entrainment of the liquid film captured during the dust removal and demisting process, eliminate gypsum rain, and achieve ultra-low emission of flue gas.

Description

Flue gas treatment system

Technical Field

The utility model belongs to the technical field of the flue gas is handled, especially, relate to a boiler flue gas dust removal defogging desulfurization processing system.

Background

The boiler flue gas needs to be subjected to dust removal and demisting treatment before being discharged, so that the environment-friendly discharge requirement is met. When wet desulphurization is adopted, a large amount of gypsum rain is produced, and the gypsum rain hardly reaches the standard through the ridge demister. The tube bundle type dust and mist removing device can enable the desulfurized flue gas to generate centrifugal motion when passing through the cyclone, and fine fog drops and dust particles in high-speed airflow are separated from the gas under the action of centrifugal force and flow down along the inner wall of the mist removing cylinder to realize gas dust and mist removal, so that the tube bundle type dust and mist removing device is widely applied.

Present tube bank formula dust removal defroster, reform transform at the existing desulfurizing tower of utilization, when demolising original ridge defroster, utilize original ridge defroster space for furthest, improve the defogging effect, adopt the fixed plate (see fig. 1) of hexagonal plate as the defogging barrel usually, however, because of the hexagonal plate trompil butt joint tube bank barrel, can furthest utilize the area of hexagonal plate, the result leads to the barrel to excessively arrange densely, install in a narrow and small tower body, connect between the bottom plate because of the gap undersize each other, it is inconvenient to be under construction, it is not good to lead to sealing between the bottom plate. When the demister works, under the impact of high-speed airflow, the fixed plates are loosened, and gypsum droplets enter the demister to form siltation, so that the internal pollution of the tower body is caused. The cleaning is very troublesome. When utilizing existing desulfurizing tower to reform transform, because of original ridge defroster supporting beam interval broad and be parallel strips and distribute, and the special shape of hexagon plate, for preventing that the stability that partly hexagon plate edge was built on stilts, the uneven influence defroster of atress when the hexagon plate fixed plate is connected to form one slice appears, need increase a supporting beam usually to it is firm to ensure that the hexagon plate fixed plate after the installation tube bank barrel.

In addition, the existing tube bundle dedusting and demisting cylinder has the advantages that the number of blades and the inclination angle of the cyclone are fixed (see fig. 2), when a multilayer cyclone is arranged for demisting, the problem that liquid drops are captured by air flow twice entrainment easily in the ascending process of air flow due to the fact that the content of dust and mist in the air flow of a lower layer is high, the separated liquid drops are thick and the number of large liquid drops is large, and the liquid drops in the air flow of an upper layer are thin and the number of small liquid drops is large is caused, and the separation effect. In addition, in the process of the gas flow ascending, pressure drop is generated, so that the ascending gas flow is decelerated, and the effect of gas-liquid centrifugal separation is also influenced. The existing confluence flow guide device is a through double-funnel-shaped structure (shown in figure 2) which is symmetrically designed, the upper funnel and the lower funnel are designed in an equal volume mode, the diameter of the middle connecting part is reduced to form a speed increaser, when the device is used, the lower part is a confluence ring, the upper part is a flow guide ring, and the flow guide ring is in direct contact with the end surface of the confluence ring to form the speed increaser. When the high-speed airflow passes, the problems that the liquid film thickness of the confluence ring is difficult to control and the capturing liquid drops are secondarily entrained by the flow guide ring occur, so that the effect of the dust removal demister is influenced.

Therefore, the system optimization and design of the existing desulfurizing tower are very important to ensure the normal operation of the wet scrubbing flue gas desulfurization system and realize the ultralow emission.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a flue gas processing system to prior art's defect and not enough, satisfy flue gas desulfurization dust removal defogging and realize the purpose of ultralow emission.

In order to achieve the aim, the utility model provides a flue gas treatment system, which comprises a cloth bag electric dust remover, a draught fan, a dust and mist removal desulfurizing tower and a discharge chimney which are connected in sequence; the dedusting and demisting desulfurization tower comprises a desulfurization section and a demisting section; and the demisting section is provided with a tube bundle type dust removal demister and a baffle plate demister.

According to one aspect of the utility model, the demisting section is also provided with a washing water system, which comprises a water feeding pipe, a washing water pipeline and a spray head which are connected in sequence, and the spray head respectively washes the tube bundle type dust removal demister and the baffle plate demister through the water spray head, the upper spray head and the lower spray head; the distance between two adjacent water spray heads, between the upper spray heads and between the lower spray heads is 30-50 cm, and preferably 40 cm.

According to the utility model discloses an aspect, the sparge water pipeline is including installing baffling board defroster top 300 ~ 400 mm's one-way sparge water pipeline, and install the baffling board defroster with two-way sparge water pipeline between the tube bundle formula dust removal defroster.

According to an aspect of the utility model, two-way washing water pipe distance tube bank formula dust removal defroster is 500 and gives rise to power 700mm, preferably 600 mm.

According to the utility model discloses an aspect, dust removal defogging desulfurizing tower is along the air current ascending direction, and the internal diameter of desulfurizing tower reduces gradually.

According to one aspect of the utility model, a desulfurization absorption layer is arranged in the desulfurization section, the desulfurization absorption layer is a distributed calcium oxide spraying system, and the calcium oxide is sprayed to absorb sulfide in the flue gas; preferably, the upper layer, the middle layer and the lower layer of the desulfurization absorption layer are sprayed with absorption liquid through 3 layers of absorption liquid spray heads arranged in the desulfurization section.

According to one aspect of the utility model, a gas distribution plate is arranged 1.5-2.5 m below the desulfurization absorption layer, preferably 2m below; a plurality of airflow holes with the diameter of 2-5 cm are uniformly distributed on the gas distribution plate.

According to the utility model discloses an aspect, a plurality of gas shelves and the air current baffle that both sides are connected through vertically and horizontally staggered will about the gas distribution board both sides separate for a plurality of well style of calligraphy airflow channel about the gas distribution board, airflow channel's length, width and height are 20 ~ 40cm, 20 ~ 40cm and 10 ~ 20cm respectively.

According to the utility model discloses an aspect, be in on the gas plate washer each 20 ~ 40cm symmetry in the upper and lower both sides of gas distribution plate sets up two pairs of plate washer through-holes, the air current baffle is the I shape baffle, two pairs of baffle through-holes have been seted up to the symmetry on the both sides end plate of baffle, the plate washer through-hole of gas distribution plate's upper and lower both sides with the baffle through-hole corresponds to through bolt, nut fixed connection the gas plate washer with the air current baffle.

According to one aspect of the utility model, a flue gas inlet is arranged at the lower part of the desulfurization section of the desulfurization tower, a transition section with a trapezoidal longitudinal section is arranged between the flue gas inlet of the desulfurization section of the desulfurization tower and the gas distribution plate, and the height of the transition section is 100-200 cm; the gas distribution plate is arranged 2.5 meters above the transition section.

According to the utility model discloses an aspect, baffling board defroster's baffling board lower edge is the arc structure that the downward protrusion extended, the arc structure sets up the central authorities or the interval 40 ~ 50cm setting of baffling board lower edge.

According to the utility model discloses an aspect, arc structure position is connected with flute profile water conservancy diversion pole, flute profile water conservancy diversion pole downwardly extending is extended and is descended tube bundle formula dust removal defroster is connected, the water conservancy diversion pole is the PP material.

According to the utility model discloses an aspect, the guide bar upper end pass through the buckle with baffling board lower edge arc structural connection, the lower extreme is close to connecting piece fixed connection is passed through at the last air vent position of tube bundle formula dust removal defroster's upper fixed plate, the downwardly extending of guide bar lower extreme extends to the inner wall of tube bundle formula dust removal defroster.

According to an aspect of the utility model, the water conservancy diversion pole is the smooth convex slot in surface.

According to the utility model discloses an aspect, the baffling board defroster with interval 1 ~ 1.8m between the tube bundle formula dust removal defroster.

According to the utility model discloses an aspect, tube bank formula dust removal defroster installs on a supporting beam in the desulfurizing tower desulfurization section, including the upper fixed plate, a tube bank defogging section of thick bamboo and the bottom plate that connect in proper order.

According to one aspect of the present invention, the tube bundle defogging barrel is fixed on the supporting beam through the lower fixing plate, the supporting beam horizontally spans on the inner wall of the desulfurization tower, and the tube bundle defogging barrels are connected in parallel through the upper fixing plate and the lower fixing plate; a circular upper vent hole and a circular lower vent hole are respectively arranged in an annular ring formed at the connecting part of the tube bundle defogging barrel and the upper fixing plate and the lower fixing plate in a penetrating way; the upper fixing plate and the lower fixing plate are square plates with side length larger than the outer diameter of the tube bundle defogging barrel.

According to one aspect of the present invention, the upper vent hole and the lower vent hole are formed at the center of the upper fixing plate and the lower fixing plate; and internal thread holes with the diameter of 1-2 cm are symmetrically formed in four corners of the upper fixing plate.

According to the utility model discloses an aspect, tube bank formula dust removal defroster still includes the connection piece, the connection piece covers the bight of upper fixed plate, on the connection piece with the corresponding position of the angular hole on the upper fixed plate seted up with the through-hole that the angular hole internal diameter is close, pass through the bolt in bight between two adjacent upper fixed plates connection piece fixed connection.

According to the utility model discloses an aspect, between the adjacent upper fixed plate between the adjacent bottom plate the bottom plate with connecting position between the tube bank barrel is sealed through sealed glue or plastic welding is sealed.

According to the utility model discloses an aspect between tube bank defogging barrel and the desulfurizing tower body inner wall, it is right through the blind plate tube bank formula dust removal defroster with gap between the tower body inner wall seals.

According to the utility model discloses an aspect, the blind plate with through bolt, connection piece fixed connection between the adjacent upper fixed plate.

According to the utility model discloses an aspect, it is less than to go up the air vent diameter the opening size of tube bank defogging barrel, preferably, go up the air vent diameter the opening diameter of tube bank defogging barrel is little 1 ~ 4 cm.

According to an aspect of the present invention, the lower vent size is the same as or close to the tube bundle cylinder inner diameter.

According to an aspect of the utility model, in the tube bank defogging section of thick bamboo the superiors' swirler with the vertical distance of an upper fixed plate is 30 ~ 50 cm.

According to an aspect of the present invention, the number of the support beams is 8 to 10.

According to the utility model discloses an aspect, the bottom plate length of side is 30 ~ 60cm, two to the limit erect adjacent two on the supporting beam.

According to the utility model discloses an aspect, install at least one on the bottom plate upper surface and connect the bottom plate with the strengthening rib of the outer wall of a tube bank defogging section of thick bamboo, preferred strengthening rib is triangle-shaped, the strengthening rib passes through plastic welding on bottom plate and tube bank barrel outer tube wall.

According to the utility model discloses an aspect the four corners symmetrical arrangement of bottom plate is 4 strengthening ribs.

According to the utility model discloses an aspect, two at least crossbeams have been pressed on the upper fixed plate, fixed tube bank formula dust removal defroster.

According to the utility model discloses an aspect, defogging wash water system is installed to tube bank defogging section of thick bamboo top, including last water pipe, wash water pipeline, water shower nozzle, the water shower nozzle opening is installed downwards and the interval on the wash water pipeline, distance between two adjacent water shower nozzles is 30 ~ 50cm, preferably 40 cm.

According to the utility model discloses an aspect, tube bank formula dust removal defroster top and/or below installation flue gas pressure monitoring devices when the monitoring pressure value surpasss the predetermined scope, opens the water shower nozzle is right the tube bank formula dust removal defroster washes.

According to one aspect of the utility model, the tube bundle demisting cylinder is a multistage rotational flow tube bundle demisting cylinder, and comprises a tube bundle cylinder body, a confluence flow guide device and at least two stages of cyclones;

the tube bundle cylinder is a hollow cylinder with openings at two ends, and the primary cyclone, the confluence flow guide device and the secondary cyclone are sequentially coaxially arranged in the tube bundle cylinder at intervals from bottom to top;

the primary cyclone and the secondary cyclone both comprise a central shaft, blades and a cyclone lantern ring;

the blades are arranged in a ring shape around the central shaft and are obliquely arranged on the central shaft, and the rotational flow lantern ring is fixed and coaxially connected with the central shaft through the blades;

the blades are of propeller type inclined blade structures, and the inclination angle formed between the plane where the blades are located and the central axis is an acute angle; the inclination angle between the plane of the first-stage swirler vanes and the central axis is smaller than that between the plane of the second-stage swirler vanes and the central axis.

According to the utility model discloses an aspect, still be provided with tertiary swirler in the tube bank barrel, tertiary swirler sets up secondary swirler's top tertiary swirler with still be provided with the guiding device that converges between the secondary swirler.

According to an aspect of the present invention, the blade inclination angle is 20 ~ 40 °.

According to one aspect of the present invention, the blade inclination angles of the first, second and third cyclones are 25 °, 28 ° and 30 °, respectively.

According to an aspect of the invention, the number of vanes of the swirler increases in sequence along the direction of the air flow.

According to one aspect of the present invention, the first, second and third cyclones have 15 vanes, 18 vanes and 20 vanes, respectively.

According to an aspect of the present invention, the first, second and third cyclones are of an integrally formed structure of the vane, the center pin and the swirl lantern ring.

According to the utility model discloses an aspect, one, two and tertiary swirler the blade with center pin integrated into one piece structure, the whirl lantern ring cover is established and is fixed the blade periphery, the blade tip with whirl lantern ring cover inner wall contact site passes through viscose or welded fastening.

According to an aspect of the present invention, the swirler with the tube bank barrel passes through bolt fixed connection.

According to an aspect of the utility model the swirler with relative position bores 3 ~ 4 internal thread holes on the tube bank barrel, through bolt fixed connection, preferably the swirler with equidistant internal thread hole of arranging for the central axis symmetry on the tube bank barrel.

According to the utility model discloses an aspect, the tube bank barrel includes coaxial setting's last barrel, lower barrel and butt joint ring, go up the barrel, down the barrel inlays and embolias in the butt joint ring, go up the barrel, down the barrel passes through barrel contact end face sealing connection, go up the barrel, down barrel and butt joint ring contact position pass through the sealing member sealed, preferably sealed through plastic welding.

According to an aspect of the invention, the blades of the primary and secondary cyclones are connected to the central shaft by a right-handed and/or a left-handed type.

According to an aspect of the invention, the blades of the primary, secondary and tertiary cyclones are connected to the central shaft by a right-handed and/or a left-handed type.

According to the utility model discloses an aspect, the blade of one-level swirler pass through right-handed rotation formula with the center pin connection, the blade of second grade swirler pass through left-handed rotation formula with the center pin is connected.

According to an aspect of the utility model, the blade of one-level and second grade swirler through the right-hand rotary type with the center pin connection, the blade of tertiary swirler through the left-hand rotary type with the center pin is connected.

According to an aspect of the utility model, the guiding device that converges is both ends opening, middle undergauge, the smooth cavity barrel of inner wall, including collector ring, water conservancy diversion ring and speed increaser.

According to the utility model discloses an aspect, the speed increaser is the acceleration ring that highly is 10 ~ 100mm, is located the collector ring with in the middle of the water conservancy diversion ring, the speed increaser with the collector ring with connect the position between the water conservancy diversion ring, through circular arc transitional coupling.

According to an aspect of the utility model, the acceleration ring is the drum structure, acceleration ring exit end opening diameter equals its entry end opening diameter.

According to the utility model discloses an aspect, the acceleration rate ring is venturi type tubular structure, acceleration rate ring exit end opening diameter is less than its entry end opening diameter.

According to an aspect of the utility model, collector ring and water conservancy diversion ring for the acceleration ring is the symmetry funnel shaped structure.

According to an aspect of the utility model, collector ring and water conservancy diversion ring for the acceleration ring is asymmetric funnel column structure, the collector ring height is greater than water conservancy diversion ring height, and/or, collector ring entry end opening diameter is greater than water conservancy diversion ring exit end opening diameter.

According to an aspect of the present invention, the inlet end opening diameter of the baffle ring is 50% -70%, preferably 60% of the inlet end opening diameter of the collector ring.

According to the utility model discloses an aspect, the guiding gutter has been seted up to the guiding ring on the inner wall of entrance point along the exit end, the guiding gutter degree of depth is 1 ~ 4 mm.

According to the utility model discloses an aspect, the guiding gutter is the strip shape groove that the cross section is convex or the spiral groove unanimous with air current whirl direction.

According to the utility model discloses an aspect equidistant evenly distributed 3 ~ 8 on the inner wall of water conservancy diversion ring the guiding gutter.

According to the utility model discloses an aspect, the guiding gutter follows the guiding ring exit end follows the inner wall of guiding device that converges passes downwards the speed ring extends to the converging ring entry end.

According to an aspect of the utility model, the guiding device that converges is installed the swirler top of tube bank barrel, preferably direct with the butt joint of swirler terminal surface.

According to an aspect of the utility model, converge guiding device with the tube bank barrel passes through the mounting and connects, preferably passes through bolted connection, more preferably converge guiding device with bore 3 ~ 4 internal thread holes on the circumference of relative position on the tube bank barrel, through bolt fixed connection, more preferably converge guiding device collector ring with on the tube bank barrel for the equal interval arrangement of tube bank barrel center axis symmetry internal thread hole.

According to the utility model discloses an aspect, tube bank formula dust removal defroster, baffling board defroster, wash water system, gas distribution board, gas baffle, air current baffle, water conservancy diversion pole, the tube bank barrel converges guiding device, swirler, parts and components such as upper fixed plate, bottom plate, blind plate, strengthening rib all adopt corrosion-resistant material preparation, preferably PP.

According to an aspect of the present invention, the flue gas is a sulfur-containing gas produced after combustion from a boiler.

According to the utility model discloses an aspect, the flue gas gets into before the sack electrostatic precipitator carries out the electrostatic precipitator, still include flue gas denitration treatment.

According to the utility model discloses an aspect, dust removal defogging desulfurizing tower forms through reforming transform for traditional desulfurizing tower.

According to an aspect of the utility model, draught fan pressure is 7 KPa.

Compared with the prior art, the utility model, following beneficial effect has:

1) the utility model can be transformed by using the existing wet desulphurization tower, the investment is small, and the construction speed is high; through carrying out the organic combination with sack electricity removal, tube bank centrifugation whirl dust removal defogging, baffling board defogging to reform transform gas distribution board, the swirler of tube bank defogging device, the baffling board isotructure of baffling board defroster, can realize the coupling effect between sack electricity removal, tube bank centrifugation whirl dust removal defogging, the three kinds of dust removals of baffling board defogging, the defogging equipment, the liquid film formation secondary of eliminating tube bank dust removal defogging in-process entrapment is smugglied secretly, eliminates the gypsum rain, realizes the ultralow emission of flue gas.

The flue gas gets into the desulfurization section and is trapezoidal changeover portion water conservancy diversion through the longitudinal section earlier before desulfurization, reducing (reduce along air current ascending direction diameter) gets into gas distribution plate behind the flue gas inflow with higher speed, independent well style of calligraphy air current passageway is separated into to both sides about the gas distribution plate, can carry out the rectification to the flue gas, evenly distributed, the desulfurization absorbed layer that gets into the desulfurization section through the air current hole on the air current passageway, gas distribution plate can play and carry out the rectification to the updraft of flue gas, realize the evenly distributed of flue gas, thereby reach the mesh of fully absorbing the sulphide in the flue gas, the desulfurization effect has been improved. The upper layer, the middle layer and the lower layer of the desulfurization absorption layer are sprayed with the absorption liquid simultaneously through the 3 layers of absorption liquid spray heads arranged in the desulfurization section, so that the desulfurization of the flue gas can be accelerated, and the desulfurization effect is improved.

The lower edge of the baffle plate demister is designed into a downward convex arc-shaped structure and is connected with the groove-shaped flow guide rod, so that on one hand, liquid drops condensed on the baffle plate can flow to the arc-shaped structure part along the lower edge of the baffle plate, and flow to the inner wall of the tube bundle demisting cylinder below along the groove of the flow guide rod to flow to the desulfurization section, the probability of secondary entrainment of the secondary mist drops of the baffle plate demister is reduced, gypsum rain can be thoroughly eliminated, and the ultralow standard emission of flue gas is ensured.

2) The utility model discloses, a tube bank defogging section of thick bamboo stability is good, simple to operate, easy maintenance. The water retaining ring is naturally formed by utilizing the upper fixing plate, the structure is simple, the construction is convenient, and the liquid film formed on the inner wall of the cylinder body is prevented from being brought out by gas to form secondary entrainment; the vertical distance between the cyclone on the uppermost layer of the tube bundle defogging barrel and the upper fixing plate is 30-50 cm, and the gas-liquid separation is realized by the aid of a liquid film formed on the inner wall of the barrel by airflow.

3) The utility model discloses, through adopting the design of multistage swirler to adjustment swirler blade plane and center pin line inclination can change the interior desulfurization flue gas velocity that passes through of defogging barrel, and the centrifugal velocity of the air current of defogging barrel upper end when passing through the swirler is with higher speed, and the layering desorption of droplet in the realization flue gas. Wherein, the blade inclination of one-level swirler is less, does benefit to big liquid drop and does benefit to the centrifugation of the lower floor of tube bank defogging barrel as far as possible and gets rid of, and the blade inclination of second grade and tertiary swirler is crescent more, has increaseed the resistance that the air current passed through, and the diversion is with higher speed through the centrifugal velocity of air current to detach the droplet in the air current with higher speed, do benefit to the droplet and detach at the upper strata centrifugation of tube bank defogging barrel.

4) The utility model discloses, through adopting the design of multistage swirler to adjustment swirler blade quantity can change the interior desulfurization flue gas velocity that passes through of defogging barrel, and the centrifugal speed of the air current when passing through the swirler of defogging barrel upper end realizes the layering desorption of droplet in the flue gas with higher speed. Wherein, the one-level swirler blade number is few, does benefit to big liquid drop and tries just as much as possible and detach at the lower floor centrifugation of tube bank defogging barrel, eliminates big liquid drop, and the blade number of second grade and tertiary swirler increases gradually, has increaseed the resistance that the air current passes through, and the diversion is with higher speed through the centrifugal velocity of air current to detach the small liquid drop in the air current with higher speed, do benefit to the small liquid drop and detach at the upper strata centrifugation of tube bank defogging barrel. The number of the blades of the cyclone increases gradually along with the ascending of the airflow, so that the pressure drop loss can be reduced as much as possible on the premise of ensuring that demisting is up to standard, and the gas emission is facilitated.

5) The utility model discloses, the blade inclination of one, two and tertiary swirler designs respectively for 25 °, 28 and 30, simultaneously, and the blade of one, two and tertiary swirler sets up respectively to 15, 18 and 20, adjusts blade inclination and blade quantity simultaneously, and the centrifugation that can full play swirler takes off the liquid effect, and the gas flow pressure drop loss that reduces simultaneously is convenient for purify back fume emission.

6) The utility model discloses, multistage spiral-flow tube bank defogging section of thick bamboo, including the tube bank barrel, converge guiding device, swirler all adopt the PP material, equipment, installation, sealed processing are swift when the on-the-spot installation of being convenient for, and the swirler passes through blade, center pin, the whirl lantern ring is integrated into one piece, and the large-scale production and the installation of being convenient for, production efficiency is high.

7) The utility model discloses, for the central axis symmetrical arrangement internal thread hole on swirler, converge guiding device and tube bank barrel, through bolt fixed connection swirler and tube bank barrel, converge guiding device and tube bank barrel, both kept the steady operation of dust removal defogging barrel, made things convenient for the site operation installation again.

8) The utility model discloses, can be according to the interior dust removal defogging requirement of on-the-spot wet flue gas desulfurization tower, through the last barrel of coaxial setting, lower barrel and the pipe bank barrel of assembling of docking ring, can realize the defogging effect, reach the emission requirement.

9) The utility model discloses, the blade of one-level and second grade swirler passes through right-handed rotation formula and center pin connection, and the blade of tertiary swirler passes through left-handed rotation formula and center pin connection, and the blade direction of rotation of the swirler of end is given vent to anger through changing the defogging barrel to force the air current to change the air current direction of rotation, can play the air current vortex effect and cause the little drop that contains in the upper air current to accelerate from the air current centrifugation, thereby improve dust removal defogging effect.

10) The utility model discloses, the speed increaser sets up to high 10 ~ 100 mm's acceleration ring, can better exert the plastic effect to the air current that passes through, in addition, the acceleration ring sets up to venturi type tubular structure, and the acceleration ring is given vent to anger end opening diameter and is less than inlet end opening diameter, can also play further acceleration through the rising speed of air current, simultaneously, can prolong contact surface and the contact time between centrifugal air current and acceleration ring inner wall to, be favorable to liquid separation, improve dust removal defogging effect.

11) The utility model discloses, design collector ring and water conservancy diversion ring for asymmetric structure, the collector ring height is greater than the water conservancy diversion ring height, and collector ring entry opening diameter is greater than water conservancy diversion ring exit opening diameter can prolong contact surface and contact time between centrifugal air current and the collector ring inner wall to, be favorable to the liquid separation, improve dust removal defogging effect. The connection position between acceleration ring and collector ring and the water conservancy diversion ring through circular arc transitional coupling, the liquid of being convenient for to separate out is along the smooth following current of the guiding device inner wall that converges and down, simultaneously, has avoided the secondary of air current to smuggle secretly, and dust removal defogging is effectual.

12) The utility model discloses, set up the depth and be 1 ~ 4mm, 3 ~ 8 evenly distributed guiding gutters on the inner wall of guiding ring, the liquid drop in the air current can be held back by the guiding gutter, prevents to appear the too big problem of liquid film thickness on the barrel inner wall, has avoided the secondary of flue gas stream to smuggle secretly; the direction of rotation of guiding gutter is unanimous with the air current whirl direction that passes through, the guiding gutter passes the speed increaser from guiding ring exit end downwards and extends to the collector ring entry end, on the one hand for the fog droplet that separates from defogging barrel upper end and wash hydroenergy and pass through the guiding gutter smoothly following current fast and down, simultaneously, the secondary of air current has been avoided smuggleing secretly, in addition, can also reduce the resistance to the whirl air current, be favorable to high-speed centrifugal air current to hold back the quick water that looses of liquid film that forms, dehydration when flowing through the guiding gutter, dust removal defogging is effectual.

13) The utility model discloses, adopt the mode of multistage tube bank barrel series connection, in easy to assemble, processing, can prolong the height of tube bank barrel according to on-the-spot customer desorption requirement, guarantee the dwell time of air current in the tube bank, ensure the efficiency of desorption.

Drawings

FIG. 1 is a schematic top view of a prior art tube bundle type dust and mist eliminator;

FIG. 2 is a schematic view of a tube bundle dedusting and demisting cylinder in the prior art;

FIG. 3 is a schematic view of a dedusting and demisting desulfurization tower according to an embodiment of the present invention;

FIG. 4 is a schematic view of a gas distribution plate of a dedusting and demisting desulfurization tower according to an embodiment of the present invention;

FIG. 5 is a schematic top view of an enlarged structure of a local unit of a gas distribution plate according to the present invention;

FIG. 6 is a schematic view showing the positions and connection relationship between the monolithic baffle structure of the demister with upper baffle and the cylinder of the demister below according to an embodiment of the present invention;

fig. 7 is a schematic view of a single baffle plate structure of an upper baffle plate demister according to an embodiment of the present invention;

fig. 8 is a schematic top view of a structure of the upper fixing plate of the present invention after being mounted on the tube bundle defogging cylinder;

FIG. 9 is a schematic view of the connection between the demister cylinder and the upper and lower fixing plates of the present invention;

(P-P: longitudinal section of upper fixing plate along the central axis of two diagonal holes)

FIG. 10 is a schematic view of a positional relationship between a demister cylinder and a washing water system of the present invention;

fig. 11 is a schematic view of a longitudinal section of the upper fixing plate of fig. 9 taken along the P-P position;

FIG. 12 is a bottom view of the installed tube bundle dust and mist eliminator of the present invention;

FIG. 13 is a schematic view of a bottom support beam of a tube bundle dust and mist eliminator of the present invention;

FIG. 14 is a top view of the installed tube bundle dust and mist eliminator of the present invention;

FIG. 15 is a schematic view of a tube bundle dust and mist removing barrel of the present invention;

fig. 16 is a schematic structural view of a right-handed swirler with vanes for a tube bundle dust-removing and mist-removing barrel according to the present invention;

(D-D swirler longitudinal section through the center axis)

FIG. 17 is a schematic cross-sectional view of the swirler of FIG. 16 taken along the longitudinal direction D-D through the central axis;

(E-E projection line of the center axis of the cyclone at the connecting part of the blade and the inner wall of the cyclone lantern ring)

FIG. 18 is a schematic structural view of a left-handed cyclone with vanes for a tube-bundle de-dusting and de-misting cartridge of the present invention;

FIG. 19 is a schematic view comparing the connection relationship between the left-handed and right-handed swirler vanes and the center shaft;

(1-1: right-handed top view of blade, 1-2: 1-1 schematic view of connecting part of central shaft and blade, 2-1: left-handed top view of blade, 2-2: 1 schematic view of connecting part of central shaft and blade)

FIG. 20 is a schematic view of a tube bundle dedusting and demisting cylinder with a three-stage cyclone structure;

fig. 21 is a schematic structural view of a converging flow guiding device for a tube bundle dust-removing and mist-removing barrel of the present invention;

FIG. 22 is a top view of the converging flow guiding device for the tube bundle dust-removing and mist-removing barrel of the present invention;

(B-B: converging guide device along central axis longitudinal section line)

FIG. 23 is an enlarged partial side view of the converging flow directing device of FIG. 22 at top view A;

FIG. 24 is a cross-sectional view of the converging flow guide device B-B of FIG. 22;

FIG. 25 is a schematic view of a converging flow guiding device for a tube bundle de-dusting and de-misting barrel of the present invention;

FIG. 26 is a top view of the converging flow guiding device for the tube bundle dust and mist removing barrel of the present invention;

FIG. 27 is a schematic view of a flow of a dedusting, demisting and desulfurizing flue gas treatment system.

In the figure: a tube bundle cylinder 1; a lower cylinder 11; an upper cylinder 12; a docking ring 13; barrel contact end face 14; a seal 15; a support beam 16; a blind plate 17; an upper beam 18; a blind plate 19; a converging and guiding device 2; a bus ring 21; a deflector ring 22; a speed increaser 23; a collector ring inlet 211; a slip ring outlet 212; a deflector ring inlet 221; deflector ring outlet 222; a guide groove 223; a swirler 3; a central shaft 31; a blade 32; a swirl collar 33; a bolt 34; an included angle 35 between the projection line E-E and the connecting part of the blade and the inner wall of the rotational flow lantern ring; a central shaft and blade connection 36; a primary cyclone 301; a secondary cyclone 302; a tertiary cyclone 303; an upper fixing plate 4; an upper fixing plate body 41; an upper vent 42; corner holes 43; a sealing strip 44; a water retaining ring 45; a connecting sheet 5; a through hole 51; a bolt 52; a lower fixing plate 6; a lower fixing plate body 61; a lower vent hole 62; a reinforcing rib 63; a rinse water system 7; a water feed pipe 71; a flush water line 72; a water jet 73; a lower spray head 74; a flush water tube 75; an upper spray head 76; a desulfurizing tower 8; a desulfurization section 81; a gas distribution plate 811; a blind plate 8110; an airflow aperture 8111; an air flow baffle 8112; a gas baffle 8113; a bolt 8114; a nut 8115; a transition section 82; a demisting section 83; a flue gas collection section 84; a flue gas inlet 85; an absorption liquid outlet 86; an absorption liquid inlet 87; an absorption liquid spray head 88; a desulfurization absorbing layer 89; a baffle demister 9; a baffle plate 91; the baffle has an arcuate configuration lower edge 92.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is not limited to the following embodiments.

Embodiment mode 1

Fig. 3-6 are schematic diagrams showing a dust removal and demisting desulfurization tower and a gas distribution plate and baffle plate structure thereof according to embodiment 1 of the present invention, and fig. 27 is a schematic diagram showing a flow of a dust removal and demisting desulfurization flue gas treatment system.

In embodiment 1, the dedusting and demisting desulfurization tower is designed and constructed, a traditional tube bundle demisting cylinder is adopted, and the fixing device or the components involved in the installation are optimally designed.

As shown in fig. 27, in embodiment 1, the flue gas treatment system includes a cloth bag electric dust remover, an induced draft fan, a dedusting and demisting desulfurization tower, and a discharge chimney. Flue gas from the boiler enters the cloth bag electric dust remover for removing most dust by electric dust under the suction force of the draught fan after denitration treatment, and then enters the dust removal and demisting desulfurization tower for desulfurization, secondary dust removal and demisting, and the flue gas reaches the standard and is discharged through a discharge chimney. The bag-type electric dust remover can select types according to the treatment requirement of the flue gas at the inlet of the desulfurizing tower, and can also select a plurality of parallel combination dust removals as required.

As shown in fig. 3, the dedusting and demisting desulfurization tower is divided into a desulfurization section 81, a demisting section 83 and a flue gas collection section 84 from bottom to top; and a tube bundle type dust removal demister and a baffle plate demister 9 are arranged in the demisting section 83, and the baffle plate demister 9 is arranged above the tube bundle type dust removal demister by 1.5 m. Set up desulfurization absorbed layer 89 in desulfurization section 81, desulfurization absorbed layer 89 is distributed calcium oxide spraying system, sprays the sulphide in the calcium oxide absorption flue gas. A gas distribution plate 811 is installed 2m below the desulfurization absorbing layer 89. A flue gas inlet 85 is arranged at the lower part of the desulfurization section 81 of the desulfurization tower, and a transition section 82 with a trapezoidal longitudinal section is also arranged between the flue gas inlet 85 and the gas distribution plate 811; the gas distribution plate 811 is mounted 2.5 meters above the transition section 82. The transition section 82 is a cylindrical structure with a trapezoidal longitudinal section, and the height of the transition section 82 is 200 cm. And a washing water system 7 is further installed in the demisting section 83 and comprises an upper water pipe 71, a washing water pipeline 72 and spray heads, wherein the washing water pipeline 72 comprises a one-way washing water pipeline 75 which is 300-400 mm above the baffle demister 9 and a two-way washing water pipeline 72 which is installed between the baffle demister 9 and the tube bundle type dust-removing demister, and the spray heads wash the tube bundle type dust-removing demister and the baffle demister 9 through a water spray head 73, an upper spray head 76 and a lower spray head 74 respectively. A gas distribution plate 811 is also disposed between the desulfurization section 81 and the demisting section 83. Set up desulfurization absorbed layer 89 in desulfurization section 81, desulfurization absorbed layer 89 is distributed calcium oxide spraying system, sprays the sulphide in the calcium oxide absorption flue gas.

As shown in fig. 4, a plurality of gas flow holes 8111 with a diameter of 5cm are uniformly distributed on the gas distribution plate 811, the upper and lower sides of the gas distribution plate 811 are divided into a plurality of gas flow channels in a shape of a Chinese character jing by a plurality of gas baffles 8113 and gas flow partition plates 8112 which are connected in a criss-cross manner, and the length, width and height of the gas flow channels are 20cm, 20cm and 20cm respectively.

As shown in fig. 5, two pairs of baffle through holes are symmetrically formed in the gas baffle 8113 at an interval of 20cm on each of the upper and lower sides of the gas distribution plate 811, the airflow partition 8112 is an i-shaped partition, two pairs of partition through holes are symmetrically formed in the end plates on both sides of the airflow partition 8112, the baffle through holes on the upper and lower sides of the gas distribution plate 811 correspond to the partition through holes, and the gas baffle 8113 and the airflow partition 8112 are fixedly connected by a bolt 8114 and a nut 8115.

As shown in fig. 6, the lower edge of the baffle plate 91 of the baffle plate demister 9 is an arc structure 92 which protrudes and extends downwards, the arc structure 92 is arranged in the center of the lower edge of the baffle plate 91, a groove-shaped diversion rod 93 is connected to the arc structure 92G 1 on the lower edge of the baffle plate 91 through a buckle 94, the diversion rod 93 extends downwards and is connected with the lower tube bundle type dust and mist eliminator, the diversion rod 93 is made of PP, the upper vent hole 42 of the lower end of the diversion rod 93, which is close to the upper fixing plate 4 of the tube bundle type dust and mist eliminator, is fixed through a connecting piece 95, and the lower end of the diversion rod 93 extends downwards and extends to the inner wall.

In embodiment 1, the induced draft fan blows flue gas into the desulfurization tower 8 from the flue gas inlet 85 of the desulfurization section 81 under the induced draft pressure of 7KPa, and after the flue gas is guided, reduced, guided, accelerated by the transition section 82 of the desulfurization section 81, the flue gas is firstly rectified and uniformly distributed by the gas distribution plate 811, and then enters the desulfurization absorption layer 89 for desulfurization. In embodiment 1, the desulfurization absorbing layer 89 is a distributed calcium oxide spray system.

An absorption liquid inlet 87 is arranged at the upper part of the desulfurization section 81, the desulfurization absorption liquid enters a distributed calcium oxide spraying system downwards through an absorption liquid nozzle 88 and is sprayed with calcium oxide absorption liquid, the flue gas entering in the upward direction is fully contacted with the sprayed calcium oxide in the distributed calcium oxide spraying system, and after sulfide in the flue gas is absorbed by the absorption liquid, the sulfide is discharged from an absorption liquid outlet 86 at the bottom of the desulfurization tower 8 and enters an absorption liquid storage tank. In order to accelerate the absorption of the absorption liquid to the sulfide in the flue gas, the absorption liquid nozzles 88 can also be arranged into a plurality of layers, for example, 3 layers, and the upper layer, the middle layer and the lower layer simultaneously spray the absorption liquid to the desulfurization absorption layer 89 in a layered manner, so as to enhance the absorption effect of the distributed calcium oxide spraying system.

The wet flue gas desulfurization after the desulfurization gets into defogging section 83, gets into the earlier centrifugal cyclone separation that carries on of tube bank formula dust removal defroster, carries out further defogging through baffling board defroster 9 after, and the flue gas that rises flows into desulfurizing tower lower floor and desulfurization absorption liquid and joins the entering absorption liquid storage tank after forming the liquid film on tube bank formula dust removal defroster cylinder wall and baffling board defroster 9's baffling board 91. In order to ensure the demisting effect of the tube bundle type dust removal demister and the baffle plate demister 9, the washing water system 7 needs to be started regularly, and the fog drops hung on the tube wall of the tube bundle type dust removal demister and the inner wall of the baffle plate demister 9 are washed. The purified flue gas demisted by the baffle demister 9 enters the exhaust chimney through the flue gas collecting section 84 and is exhausted.

Flue gas from the boiler, after denitration treatment, get into the utility model discloses carry out flue gas dust removal defogging in the system and handle, through the collaborative defogging of tube bank dust removal defroster and baffling board defroster in the desulfurizing tower, can thoroughly eliminate the gypsum rain, realize ultralow emission. The lower edge of the baffle plate demister is designed into a downward convex arc-shaped structure and is connected with the groove-shaped flow guide rod, so that on one hand, liquid drops condensed on the baffle plate can flow to the arc-shaped structure part along the lower edge of the baffle plate, and flow to the inner wall of the tube bank demisting cylinder below along the groove of the flow guide rod to flow to the desulfurization section, the probability of secondary entrainment of the baffle plate demister is reduced, and the ultralow standard emission of flue gas is ensured.

Embodiment mode 2

Fig. 7 is a schematic view of a single baffle plate structure of the upper baffle plate demister according to embodiment 2 of the present invention. Unlike embodiment 1, in embodiment 2, the configuration of the baffle plate 91 is optimized. As shown in FIG. 7, an arc structure 92 is arranged at 40cm intervals on the lower edge of the baffle plate 91, and guide rods are arranged at the protruding points G1 and G2 of the arc structure 92.

The lower edge of the baffle plate 91 of the baffle plate demister 9 is designed into an arc structure 92 protruding downwards in a segmented mode, and is connected with the groove-shaped flow guide rod 93, so that small liquid drops collected on the baffle plate 91 can be accelerated to flow to the arc structure 92 along the lower edge of the baffle plate 91, and quickly flow to the inner wall of the lower-layer tube bundle cylinder 1 along the groove of the flow guide rod 93, the problem that secondary fog drops are entrained by the baffle plate demister 9 is avoided, gypsum rain is thoroughly eliminated, and ultralow standard emission of flue gas is guaranteed.

Embodiment 3

Fig. 8 is a schematic view showing the connection and installation relationship of the components such as the tube bundle type dust and mist eliminator and the upper fixing plate according to embodiment 3 of the present invention.

Unlike embodiment 2, in embodiment 3, a conventional tube bundle defogging cartridge is used, and the fixing device or the components involved in the installation thereof are optimally designed.

Fig. 8 is a schematic top view of the installed upper fixing plate in embodiment 3, showing the connection relationship between the upper fixing plate and the tube bundle cylinder of the tube bundle type dust and mist remover.

As shown in fig. 8, tube bundle dedusting and demisting components such as a cyclone 3 are installed in advance in a tube bundle cylinder 1 with an opening diameter D of 400mm and a wall thickness of 0.5cm, and 4 tube bundle cylinders 1 are positioned in a desulfurization device according to design requirements. The square upper fixing plate 4 with the side length of 450mm, which is provided with an internal thread angle hole 43 with the diameter of 1.5cm symmetrically at 4 corners and an upper vent hole 42 with the diameter of 36cm at the center of an upper fixing plate body 41, is fixed on the tube bundle cylinder 1 in a sealing way, the upper vent hole 42 is over against the top opening of the tube bundle cylinder 1, the upper vent hole 42 and the tube bundle cylinder 1 are coaxial, and the connecting part between the adjacent upper fixing plates 4 is sealed by adopting a sealing strip 44. After 4 adjacent upper fixing plates 4 are assembled together, 4 corner hole structures are formed at the connecting parts, a square connecting sheet 5 is placed at the 4 corner hole structure parts, 4 through holes 51 with the diameter close to or slightly larger than the inner diameter of the corner holes are formed at the corresponding positions of the 4 corner holes 43 and the connecting sheet 5, and the connecting sheet 5 and the 4 upper fixing plate bodies 41 are fixed by bolts 52, so that the upper end integrated closed structure of the tube bundle type dust and mist remover is completed.

In embodiment 3, the tube bundle type dust and mist removing device comprises an upper fixing plate 4, a tube bundle mist removing cylinder 1, a connecting sheet 5 and the like, which are all made of corrosion-resistant PP materials, and can meet the working condition requirements of batch production, field modular assembly, low labor intensity and the requirement of meeting the flue gas desulfurization environment.

Embodiment 4

Fig. 9 to 14 are schematic views showing the connection and installation relationship of the tube bundle type dust and mist eliminator and the upper and lower fixing plates according to embodiment 4 of the present invention.

Different from embodiment 3, the desulfurizing tower 8 in embodiment 4 is technically modified for the existing desulfurizing tower, the main structure of a ridge type demister is removed, a supporting beam 16 is reserved, a tube bundle type dust removal demister is designed and installed on the supporting beam 16, and a baffle plate demister 9 is installed above the tube bundle type dust removal demister. In addition, the fixing device or the component related to the installation of the tube bundle demisting cylinder and the air outlet end structure of the tube bundle demisting cylinder are improved.

As shown in fig. 9, in embodiment 4, the tube bundle cylinder 1 is assembled from a lower cylinder 11 and an upper cylinder 12, the joint portions are connected by a butting ring 13 and sealed by a sealant 15, the cylinder contact end surfaces 14 of the lower cylinder 11 and the upper cylinder 12 are sealed by the sealant, and the butting ring 13 is fixed to the lower cylinder 11 and the upper cylinder 12 by bolts (not shown).

As shown in fig. 9, an upper vent hole 42 with a diameter of 36cm is formed in an upper fixing plate body 41 of a square upper fixing plate 4 with a side length of 450mm, the upper fixing plate 4 is placed at the top end of an upper cylinder 12, the upper vent hole 42 and the upper cylinder 12 are coaxially and fixedly connected, and the contact part is sealed by a sealant.

As shown in fig. 9, a lower vent hole 62 with a diameter of 40cm close to the opening diameter of the lower cylinder 11 is formed in the center of the lower fixing plate body 61 of the square lower fixing plate 6 with a side length of 450mm, the lower fixing plate 6 is placed at the bottom of the lower cylinder 11, the lower vent hole 62 and the lower cylinder 11 are coaxially and fixedly connected, and the contact part is sealed by a sealant. Reinforcing ribs 63 of a right triangle are symmetrically arranged and vertically arranged at 4 corners of the inner surface of the lower fixing plate body 61, and the reinforcing ribs 63 are welded on the lower fixing plate body 61 and the outer cylinder wall of the tube bundle cylinder 1 through plastics.

As shown in fig. 9, the desulfurized flue gas enters from the lower vent holes 62 of the lower fixing plate body 61, undergoes gas-liquid cyclone separation through the lower cylinder 11 and the upper cylinder 12, and is then discharged from the upper vent holes 42 of the upper fixing plate body 41.

Fig. 10 is a schematic view showing a positional relationship between a demister cylinder and a washing water system according to embodiment 4 of the present invention. In the present embodiment, the washing water system 7 is installed at a position 4500mm above the upper fixing plate 4, and water is supplied through the water supply pipe 71 and the washing water pipe 72, and the water jet head 73 periodically sprays the air flow after the liquid separation from the upper vent hole 42 of the upper fixing plate body 41, so that the dust and mist attached to the inner wall of the tube bundle cylinder 1 during the gas-liquid cyclone separation of the upper cylinder 12 and the lower cylinder 11 are washed and removed, and the fine liquid droplets entrained in the air flow during the rising process can be further absorbed, and the ultralow emission of the desulfurized flue gas can be ensured. In the present embodiment, the interval between adjacent two water jets 73 on the flush water pipe 72 is 30 cm. The distance design of the water spray heads 73 is adjusted according to the demisting index control requirement by combining the structure and the size of the on-site desulfurizing tower and the working condition of the demister so as to meet the ultralow emission target of the flue gas.

Fig. 11 is a schematic view of the embodiment of the present invention shown in fig. 9, taken along the longitudinal section P-P of the upper fixing plate. As can be seen from fig. 11, the contact portion between the upper fixing plate body 41 and the tube bundle cylinder 1 is hermetically connected, because the center of the upper fixing plate body 41 is provided with an upper vent hole with a diameter d2 of 36cm, and the opening diameter d1 of the tube bundle cylinder below is 40cm, a water retaining ring 45 is formed at the upper end opening of the tube bundle cylinder 1 after the upper fixing plate 4 is installed, the ring width of the water retaining ring 45 is half of the difference between d1 and d2, and in this embodiment, the ring width of the water retaining ring 45 is 2 cm. Can utilize upper fixed plate 4 and tube bank barrel 1 contact site to form the manger plate ring through the design of opening diameter naturally, simple structure, construction convenience can prevent effectively that the liquid film that forms on the 1 inner wall of tube bank barrel from being taken out by gas, forms the secondary and smugglies secretly.

In fig. 11, the cyclone 3 is installed at the outlet end of the tube bundle cylinder 1 and fixed by bolts 34. The vertical distance h between the upper end of the cyclone 3 and the upper fixing plate 1 is 40cm, so that the centrifugal cyclone airflow coming out of the cyclone 3 continuously rises along the inner wall of the tube bundle cylinder 1, a liquid film is formed on the inner wall of the cylinder by the airflow, and the gas-liquid separation is realized by regularly washing the water through the water spray head 73 above the cylinder.

Fig. 12 shows a bottom view of the tube bundle dust removing mist eliminator of embodiment 4 after being installed, fig. 13 is a schematic view of the installation of a supporting beam at the bottom of the tube bundle dust removing mist eliminator of this embodiment, and fig. 14 is a top view of the tube bundle dust removing mist eliminator of this embodiment after being installed.

According to fig. 12 ~ 14, the utility model discloses a tube bank formula dust removal defroster reforms transform on traditional desulfurizing tower basis and forms, demolishs original ridge defroster major structure, leaves a supporting beam 16 (see fig. 12). The tube bundle type dust and mist removing device is arranged on a supporting beam 16 of a mist removing section 83 in the desulfurizing tower 8 and comprises an upper fixing plate 4, a tube bundle mist removing barrel 1 and a lower fixing plate 6 which are connected in sequence; the tube bundle defogging cylinders 1 with the opening diameter of 40cm and the cylinder wall thickness of 0.5cm are fixed on the support beam 16 through the lower fixing plate 6, the support beam 16 horizontally stretches across the inner wall of the desulfurizing tower 8, and the tube bundle defogging cylinders 1 are connected in parallel through the upper fixing plate 4 and the lower fixing plate 6; a circular upper vent hole 41 (the hole diameter is 36cm) and a circular lower vent hole 61 (the hole diameter is 40cm) are respectively arranged in an annular ring formed by the connecting part of the tube bundle defogging barrel 1 and the upper fixing plate 4 and the lower fixing plate 6 in a penetrating way; the upper fixing plate 4 and the lower fixing plate 6 are both equilateral rectangular plates with the side length larger than the outer diameter of the tube bundle defogging barrel 1, and in the embodiment, the side length of each rectangular plate is 45cm, and the thickness of each rectangular plate is 0.5 cm; the distance between two adjacent support beams 16 is 40 cm.

As shown in fig. 14, after the main structure of the tube bundle type dust and mist remover is installed, a gap between the inner wall of the desulfurizing tower 8 and the tube bundle cylinder 1 or the upper fixing plate 4 is sealed by using a blind plate 19 and fixed by using bolts and connecting pieces. As shown in fig. 12, after the tube bundle type dust and mist eliminator main structure is installed, the blind plate 17 is used to seal the gap between the inner wall of the desulfurizing tower 8 and the tube bundle cylinder 1 or the lower fixing plate 6, and in order to enhance the stability of the tube bundle type dust and mist eliminator, in the present embodiment, two upper beams 18 are additionally installed to reinforce the tube bundle type dust and mist eliminator main structure after the upper fixing plate 4 is installed.

In embodiment 4, tube bank formula dust removal defroster, including upper fixed plate 4, tube bank defogging section of thick bamboo 1, connection piece 5, bottom plate 6, strengthening rib 63, wash water pipe etc. all adopt corrosion-resistant PP material preparation, can satisfy batch production, on-the-spot modularization equipment, low in labor strength, accord with the operating mode requirement of flue gas desulfurization environment.

In embodiment 4, the existing desulfurizing tower 8 is technically modified, the flue gas collecting section 84 can be lengthened and modified to be a discharge chimney at the upper part of the existing desulfurizing tower 8, the existing chimney can also be used for discharging, the construction is convenient, and the investment is small.

Embodiment 5

Fig. 15 to 19 are schematic structural views of a three-stage cyclone tube bundle dust and mist removing tube structure and a related cyclone, which are core components of the tube bundle dust and mist removing demister according to embodiment 5 of the present invention. The difference from embodiment 4 is that in embodiment 5, the inner defogging member of the tube bundle defogging cylinder 1 is further improved, and a single-stage defogging cylinder is adopted as the tube bundle cylinder 1.

As shown in fig. 15, the tube bundle dedusting and demisting cylinder with an opening diameter D of 400mm and a wall thickness of 0.5cm comprises a tube bundle cylinder 1, a converging flow guide device 2, a primary cyclone 301, a secondary cyclone 302 and a tertiary cyclone 303; the tube bundle cylinder 1 is a hollow cylinder with two open ends, and a primary cyclone 301, a confluence flow guide device 2, a secondary cyclone 302, a confluence flow guide device 2 and a tertiary cyclone 303 are sequentially arranged in the tube bundle cylinder 1 from bottom to top at coaxial intervals. In the present embodiment, the number of the vanes 32 of each stage of the cyclone increases in the airflow direction, and the number of the vanes of the first, second and third stages of the cyclones is 15, 18 and 20, respectively.

As shown in fig. 15, the converging and guiding device 2 is a cylinder with smooth inner wall and two open ends, and includes a converging ring 21, a guiding ring 22 and a speed increaser 23, and is manufactured by integral molding. In the present embodiment, the collector ring 21 and the deflector ring 22 are formed in a symmetrical funnel shape with both ends open with respect to the speed-increasing gear 23, the collector ring 21 and the deflector ring 22 are connected by a reduced diameter portion of the funnel shape, the diameter of the hole formed at the reduced diameter portion is 60% of the diameter of the inlet of the collector ring 21, and the speed-increasing gear 23 is naturally formed at the reduced diameter portion. In this embodiment, the converging flow guide device 2 is mounted above the cyclone, preferably directly abutting the end face of the cyclone collar.

As shown in FIG. 16, the primary, secondary and tertiary cyclones each comprise a central shaft 31, vanes 32 and a swirl collar 33; the vanes 32 are arranged in a ring around the central shaft 31, and are obliquely attached to the central shaft 31, and the swirl collar 33 is fixed to and coaxially connected to the central shaft 31 via the vanes 32. For ease of manufacture and installation, the vanes 32, central shaft 31 and swirl collar 33 of the first, second and third stage cyclones are of integral construction. In the embodiment, 3-4 internal threaded holes are symmetrically drilled relative to the central axis at the relative positions of the cyclone 3 and the tube bundle cylinder 1 and are fixedly connected through the bolt 34, so that the field construction is facilitated, and the stable operation of the defogging cylinder can be met.

As shown in fig. 17, the blade 32 has a propeller-type inclined blade structure, and an inclination angle (i.e., blade inclination angle) formed between a plane in which the blade 32 is located and the central axis is an acute angle. For the sake of illustration, in fig. 17, E-E is a projection line of the central axis of the swirler at the connecting portion of the vane 32 and the inner wall of the swirl collar 33, and β is an angle 35 between the projection line E-E and the connecting portion of the vane 32 and the inner wall of the swirl collar 33, which is equal to the angle of inclination of the plane in which the vane 32 is located with respect to the central axis, and therefore, the angle of inclination of the vane can be represented by β. The blade angle of the primary cyclone 301 is 25 °, the blade angle of the secondary cyclone 302 is 28 °, and the blade angle of the tertiary cyclone 303 is 30 °.

In embodiment 5, the rotational direction of the vanes of the cyclone 3 is changed, and the vanes are connected to the center shaft 31 in a right-handed manner or a left-handed manner, so that the centrifugal airflow rising through the cyclone 3 is disturbed to accelerate gas-liquid separation, particularly droplet separation. As shown in fig. 15, the vanes 32 of the primary cyclone 301 and the secondary cyclone 302 are connected to the center shaft 31 in a right-handed manner, and the vanes 32 of the tertiary cyclone 303 are connected to the center shaft 31 in a left-handed manner. Fig. 16 and 18 schematically illustrate the overall effect of two different ways of vane rotation of the cyclone mounted on the demister cylinder, respectively. Fig. 19 shows a comparison of the relative position relationship between the connecting portion 36 between the vane 32 and the central shaft 31 of the two cyclones with different vane rotation modes, which can change the rotation direction of the air flow to achieve the purpose of forcibly disturbing the flow and separating small liquid droplets.

In embodiment 5, the converging/guiding device 2 is connected to the tube bundle cylinder 1 by a bolt (not shown in fig. 15), and 3 to 4 female screw holes are drilled symmetrically with respect to the central axis at the positions opposite to the converging/guiding device 2 and the tube bundle cylinder 1, and are fixedly connected by a bolt in a manner similar to the fixing manner of the swirler 3 and the tube bundle cylinder 1.

In embodiment 5, multistage whirl tube bank defogging section of thick bamboo, including tube bank barrel 1, guiding device 2 that converges, swirler 3 all adopts corrosion-resistant PP material preparation, can satisfy batch production, on-the-spot modularization equipment, low in labor strength, accord with the operating mode requirement of flue gas desulfurization environment.

Embodiment 6

Fig. 20 is a schematic structural view of a tube bundle dedusting and demisting cylinder with a three-stage cyclone structure, which is a core component of the tube bundle dedusting and demisting device according to embodiment 6 of the present invention. The difference from embodiment 5 is that the tube bundle cylinder 1 is assembled in two stages to form a defogging cylinder. Mainly has the following aspects:

as shown in fig. 20, the tube bundle cylinder 1 includes an upper cylinder 12, a lower cylinder 11, and a docking ring 13, which are coaxially disposed. The upper barrel body 12 and the lower barrel body 11 are nested in the butt joint ring 13, the upper barrel body 12 and the lower barrel body 11 are connected through a barrel body contact end face 14 by adopting a sealant, the contact parts of the upper barrel body 12, the lower barrel body 11 and the butt joint ring 13 are sealed through a sealing piece 15, and in the embodiment, the sealing piece 15 is in plastic welding sealing. During field installation, the cyclone 3 and the confluence flow guide device 2 in the upper barrel 12 and the lower barrel 11 are installed according to design requirements, the butt joint ring 13 is sleeved at the upper end of the lower barrel 11 and fixed through a bolt (not shown in the figure), a layer of sealant is coated on the upper end face of the lower barrel 11, then the upper barrel 12 is sleeved in the butt joint ring 13 and fixed through a bolt (not shown in the figure), and finally, the contact part of the upper barrel 12, the lower barrel 11 and the butt joint ring 13 is welded and sealed through plastics.

In embodiment 6, the tube bundle cylinder 1 is assembled by splicing the upper cylinder 12 and the lower cylinder 11, so that the height of the defogging cylinder can be flexibly adjusted according to the field requirement, and the gas-liquid separation effect is achieved. In addition, through the sectional assembly, the production and the transportation are convenient, and the field installation is convenient.

Embodiment 7

Unlike embodiment 5, the speed-increasing gearbox is different in structure. In embodiment 7, the speed increaser 23 is a cylindrical structure and is provided with a speed increasing ring with a height of 10-100 mm, the guide ring 22 and the collector ring 21 are symmetrically designed in a funnel shape, the diameter of the upper opening of the speed increasing ring is the same as that of the inlet of the guide ring 22, the diameter of the lower opening of the speed increasing ring is the same as that of the outlet of the collector ring 21, and the connecting part of the speed increasing ring and the collector ring 21 and the connecting part of the guide ring 22 are in transition connection through an arc.

The speed increaser 23 is expanded into a speed increasing ring with the diameter of 10-100 mm, so that the shaping effect on passing air flow can be better played, and gas-liquid separation is facilitated.

Embodiment 8

Fig. 21 is a schematic structural view of a converging flow guide device for a tube bundle dust and mist removing cylinder, which is a core component of the tube bundle dust and mist removing device according to embodiment 8 of the present invention. The difference between this embodiment and embodiment 7 is mainly in the difference in the structure of the collecting and guiding device 2.

As shown in fig. 21, the collector ring 21 and the guide ring 22 are asymmetric with respect to the speed-increasing gear 23, the speed-increasing gear 23 is provided as a venturi-type speed-increasing gear having a height of 100mm, and the guide ring 22 and the collector ring 21 are asymmetrically designed in a funnel shape. The diameter of an upper opening of the speed increasing ring is smaller than that of a lower opening of the speed increasing ring, the connecting part of the speed increasing ring, the collector ring 21 and the guide ring 22 is in arc transition connection, and the diameter of an inlet opening of the collector ring 21 is the same as that of an outlet opening of the guide ring 22.

Expand the speed increaser into 100 mm's venturi type acceleration ring, except can better exert the plastic effect to the air current that passes through, can also play the further acceleration through the rising speed of air current, increase the collision chance between droplet and acceleration ring inner wall in the air current, prolong the contact surface and the contact time between centrifugal air current and acceleration ring inner wall to, be favorable to liquid separation, improve dust removal defogging effect.

Embodiment 9

Fig. 22 to 24 are schematic diagrams showing a converging flow guide device structure for a tube bundle dust and mist removing cylinder and a partially enlarged schematic diagram of a core component of a tube bundle dust and mist removing demister according to embodiment 9 of the present invention. The difference between this embodiment and embodiment 8 is mainly in the difference in the construction of the collecting and guiding device 2.

First, as shown in fig. 22, 3 strip-shaped guide grooves 223 are uniformly and equally spaced on the inner wall of the guide ring 22, as shown in fig. 23, the depth of the guide groove is 2mm, the guide groove has a circular cross section, as shown in fig. 24, the guide groove 223 extends from the guide ring outlet 222 on the inner wall of the guide ring 22 to the guide ring inlet 221, and continues to pass through the inner wall of the accelerating ring downwards along the inner wall of the converging guide device 2, and extends to the inlet end 211 of the converging ring 21 through the outlet end 212 of the converging ring 21. The design can accelerate the separated fogdrops to flow downwards along the diversion trench, thereby avoiding and reducing the secondary entrainment problem of the fogdrops. In addition, evenly distributed's guiding gutter can also prevent the too big problem of liquid film thickness on the barrel inner wall, and dust removal defogging is effectual.

Secondly, the height of the confluence ring 21 is larger than that of the guide ring 22, and the opening diameter of the inlet end 211 of the confluence ring 21 is larger than that of the outlet end 222 of the guide ring 22. The design can play the roles of fully converging air flow and accelerating the air flow to centrifugally separate liquid.

Embodiment 10

Fig. 25 to 26 are schematic structural views of a converging flow guide device for a tube bundle dust and mist removing cylinder, which is a core component of the tube bundle dust and mist removing device according to embodiment 10 of the present invention. The difference between this embodiment and embodiment 9 is mainly in the structure of the flow guide groove 223 of the confluence flow guide device 2.

In embodiment 10, 4 spiral guide grooves 223 are formed in the inner wall of the guide ring 22 at equal intervals, the depth of each guide groove is 4mm, the rotation direction of the spiral is the same as the swirling direction of the passing airflow, and the guide grooves 223 extend from the guide ring outlet 222 to the guide ring inlet 221 in the inner wall of the guide ring 22.

Utilize the utility model discloses flue gas treatment process flow of embodiment is as follows:

flue gas from boiler burning after through denitration treatment, earlier through sack electrostatic precipitator, draught fan induced air, get into dust removal defogging desulfurizing tower again and carry out wet flue gas desulfurization and handle the formation and have certain dirt and the desulfurization flue gas of fog, the desulfurization flue gas is in proper order through tube bank formula dust removal defroster, baffling board defroster further dust removal and defogging after handling, satisfies the ultralow emission requirement of flue gas.

After flue gas enters a desulfurizing tower from a desulfurizing section, the flue gas firstly flows through a transition section, is rectified and uniformly distributed through a gas distribution plate after being accelerated, and then enters a desulfurizing absorption layer, and is fully contacted with sprayed calcium oxide absorption liquid in a distributed calcium oxide spraying system, sulfide in the flue gas is absorbed by the absorption liquid, the desulfurized wet-process desulfurized flue gas rises and enters a demisting section, the flue gas firstly passes through a tube bundle type dust removal demister to carry out three-stage centrifugal cyclone separation and capture large liquid drops, and then passes through a baffle plate demister to capture fine liquid drops, and the rising flue gas forms liquid films on the tube bundle type dust removal demister cylinder wall and the baffle plate demister, then flows into the lower layer of the desulfurizing tower to be converged with the desulfurizing absorption liquid to enter an absorption liquid storage tank.

For the defogging effect of guarantee tube bank formula dust removal defroster section of thick bamboo wall and baffling board defroster, regularly start the wash water system, wash the droplet on tube bank formula dust removal defroster section of thick bamboo wall and baffling board defroster baffling board. The purified flue gas after demisting by the baffle plate demister can be completely removed by dust and fog in the flue gas, and is finally exhausted by an exhaust chimney.

The process the utility model discloses the wet flue gas desulfurization flue gas of handling, through measuring, can thoroughly eliminate the gypsum rain. When the dust content at the inlet of the desulfurization absorption tower is less than or equal to 50mg/Nm³In the meantime, the desulfurizing towerThe concentration of fog drops in the outlet flue gas can be reduced to 75mg/Nm in winter³The concentration of the carbon dioxide can be reduced to 25mg/Nm in summer³The smoke concentration can be reduced to 5mg/Nm by extraction measurement³Thereby ensuring that the dust content at the outlet of the high-efficiency tube bundle type dust and mist removing device is less than or equal to 5mg/Nm³。

Comparative examples

For comparison the utility model discloses and the dust removal defogging effect between the prior art. The applicant to the desulfurizing tower that adopts traditional defogging device, the desulfurizing tower of replacement ridge formula defroster, according to the utility model discloses a defogging result of embodiment 9 (the compound defogging device of tube bank formula dust removal defroster + baffling board defroster) enters the mouth dust content 500mg Nm at the same desulfurizing tower³Comparisons were made. Specific results are shown in table 1.

TABLE 1 comparison of dedusting and demisting effects before and after improvement of desulfurizing tower technology

Traditional demisters rely on the inertia and gravity effects of the liquid droplets in the flue gas to operate. The design flow rate is generally selected to be between 3.5 and 5.5 m/s. The working principle and the running flow rate of the reentrant demister determine that fine liquid drops cannot be removed, and even a multilayer ridge type zero remover cannot realize the outlet dust concentration of 10mg/Nm³. And adopt the desulfurizing tower of the technological transformation of the compound dust removal defogging of tube bank formula dust removal defroster + baffling board defroster to carry out the dust removal defogging integration desulfurizing tower after the technological transformation to the baffling board, can realize the coupling effect of tube bank defogging and baffling board defogging, exhanst gas outlet dust concentration can reach 5mg/Nm³The following. In addition, the tube bundle type dust removal demister and the baffle plate demister are combined for dust removal and demisting, and the washing frequency, the washing water amount and the number of the electric valves of the washing water are all less than those of a conventional ridge type demister.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flue gas treatment system comprises a cloth bag electric dust remover, an induced draft fan, a dedusting and demisting desulfurization tower and a discharge chimney which are connected in sequence;

the dedusting and demisting desulfurization tower comprises a desulfurization section (81), a demisting section (83) and a flue gas collecting section (84); and the demisting section (83) is provided with a tube bundle type dust removal demister and a baffle plate demister (9), and the baffle plate demister (9) is arranged 1-1.8 m above the tube bundle type dust removal demister.

2. The flue gas treatment system according to claim 1, wherein the demisting section (83) is further provided with a flushing water system (7) comprising an upper water pipe (71), a flushing water pipe and spray heads which are connected in sequence, wherein the spray heads respectively flush the tube bundle dust and baffle mist eliminator and the baffle mist eliminator (9) through a water spray head (73), an upper spray head (76) and a lower spray head (74).

3. The flue gas treatment system of claim 1, wherein a desulfurization absorption layer (89) is arranged in the desulfurization section (81), a gas distribution plate (811) is further arranged 1.5-2.5 m below the desulfurization absorption layer (89), and a plurality of gas flow holes (8111) with the diameter of 2-5 cm are uniformly distributed on the gas distribution plate (811).

4. The flue gas treatment system of claim 3, wherein the upper side and the lower side of the gas distribution plate (811) are divided into a plurality of # -shaped gas flow channels by a plurality of gas baffles (8113) and gas flow partition plates (8112) which are connected in a cross-wise manner, and the length, the width and the height of each gas flow channel are respectively 20-40 cm, 20-40 cm and 10-20 cm.

5. The flue gas treatment system of claim 4, wherein two pairs of baffle through holes are symmetrically formed in the gas baffle (8113) at intervals of 20-40 cm on each of the upper side and the lower side of the gas distribution plate (811), the airflow partition plate (8112) is an I-shaped partition plate, two pairs of partition through holes are symmetrically formed in the end plates on the two sides of the airflow partition plate (8112), the baffle through holes on the upper side and the lower side of the gas distribution plate (811) correspond to the partition through holes, and the gas baffle (8113) and the airflow partition plate (8112) are fixedly connected through a bolt (8114) and a nut (8115).

6. The flue gas treatment system according to claim 3, wherein a flue gas inlet (85) is arranged at the lower part of the desulfurization section (81), a transition section (82) with a trapezoidal longitudinal section is further arranged between the flue gas inlet (85) and the gas distribution plate (811) in the desulfurization section (81), and the height of the transition section (82) is 100-200 cm.

7. The flue gas treatment system according to any one of claims 1 to 6, wherein the lower edge of the baffle plate (91) of the baffle plate demister (9) is a downwardly convex arc-shaped structure (92), and the arc-shaped structure (92) is arranged in the center of the lower edge of the baffle plate (91) or is arranged at an interval of 40-50 cm.

8. The flue gas treatment system according to claim 7, wherein a groove-shaped guide rod (93) is connected to a lower edge arc-shaped structure (92) of the baffle plate (91), the guide rod (93) extends downwards to be connected with the tube bundle type dust and mist removal device below, and the guide rod (93) is made of PP material.

9. The flue gas treatment system according to claim 8, wherein the upper end of the diversion rod (93) is connected with the lower edge arc-shaped structure (92) of the baffle plate (91) through a buckle (94), the lower end of the diversion rod is fixedly connected with the upper vent hole (42) of the upper fixing plate (4) of the tube bundle type dust and mist eliminator through a connecting piece (95), and the lower end of the diversion rod (93) extends downwards to the inner wall of the tube bundle type dust and mist eliminator.

10. The flue gas treatment system according to claim 1 or 9, wherein the tube bundle type dust and mist removal device comprises an upper fixing plate (4), tube bundle mist removal cylinders and a lower fixing plate (6), the tube bundle mist removal cylinders are connected in parallel through the upper fixing plate (4) and the lower fixing plate (6), and the upper fixing plate (4) and the lower fixing plate (6) are square plates with side length larger than the outer diameter of the tube bundle mist removal cylinders.