CN106693579A - Transversely arranged anchored pipeline type ultrafine particle coagulation device - Google Patents

Abstract

A horizontally anchored pipe-type superfine particle coalescer, which is pipe-type and is suitable for installation in the air intake pipe before the main dust collector. The condenser is composed of a charging area and a condensation area. The charging area has a A set of parallel passages between positive and negative phases, with negative plates, positive plates and insulating plates for separation, the dust particles in the flue gas enter the condensation area after being charged; there are 2~4 sets of transverse The horizontal bar is placed horizontally in the condensation area, and the cross-sectional shape of the horizontal bar is horizontally anchored; the flue gas after condensation enters the main dust collector for treatment. The invention has strong pertinence, wide adaptability, simple structure and good reliability.

Description

A Horizontal Anchor Pipeline Ultrafine Particle Condenser

technical field

The invention belongs to the field of flue gas dust removal treatment, and relates to a horizontally anchored pipeline type ultrafine particle condenser.

Background technique

In recent years, there have been more and more smog weather in large and medium-sized cities in China, which has seriously affected the healthy work and life of urban residents. Among them, the high content of PM _2.5 (mainly PM _0.4-1.0 ) in the urban environment is the main cause of smog weather. reason. Therefore, how to control the production of PM _2.5 and reduce its existence has become an urgent problem to be solved.

Chinese patent CN101664623A discloses a fine particle dust collector for industrial smoke control. Specifically, a turbulent vortex mechanism is provided between the outlet of the filter bag dust removal mechanism and the inlet of the induced draft fan through the improvement of the electric bag composite dust collector of the existing two-stage filtration method. The turbulent vortex mechanism includes a turbulent vortex chamber, Fume inlet pipe and fume outlet pipe. The turbulent vortex chamber is in the shape of a bucket with an inverted isosceles trapezoidal cross section, and the bottom of the vortex chamber is connected with the ash chamber. After the second-stage treatment, the dust containing finer particles enters the dust inlet pipe, passes through the wind deflector, deflects the airflow downward, and enters the turbulent vortex chamber, where the finer particles diffuse and collide with the inner wall of the turbulent vortex to promote the fine particles Particle precipitation separates fine particulate matter from the soot. However, in this treatment process, the turbulent vortex chamber is used alone for the physical-chemical coagulation of fine particles, and the coagulation efficiency is not high.

Chinese patent CN103071591A discloses a vortex generating device for agglomerators, including a frame, a motor, a driving shaft driven by the motor, and a driven shaft. At least one transmission chain is arranged between the driving shaft and the driven shaft. A vortex generating sheet is provided, and a dust cleaning device is arranged on the frame next to the vortex generating sheet. However, too many swirls affect the flue gas flow velocity and increase the pressure drop of the condenser.

Therefore, in view of the problems of low coagulation efficiency and complex process equipment, it is necessary to research and develop ultra-fine particle coagulators that strengthen coagulation on the basis of existing technologies. On the basis of the traditional dust collector, it is the current development trend of dust removal technology to add a coagulation treatment device to make the ultrafine particles condense into larger particles through physical methods or physical and chemical methods, so that they can be successfully removed in the main dust collector.

Contents of the invention

Purpose of the invention: The purpose of the invention is to solve the deficiencies of the prior art, and propose an ultra-fine particle coalescer with strong pertinence, wide adaptability, simple structure, and good reliability for enhanced coalescence.

Technical solution: In order to realize the object of the present invention, the present invention adopts the following technical solutions.

A horizontally anchored pipe-type superfine particle condenser, the entire condenser is pipe-type, suitable for installation in the air intake pipe before the main dust collector; the condenser is composed of a charging area and a condensation area; The charging area has a set of positive and negative parallel passages, which are equipped with negative plates, positive plates and insulating plates for separation. The dust particles in the flue gas enter the condensation area after being charged; in the condensation area There are 2 to 4 sets of horizontal bars, which are placed horizontally in the condensation area, and the cross-sectional shape of the horizontal bars is a horizontal anchor shape; the flue gas after condensation enters the main dust collector for treatment.

Furthermore, each group of horizontal bars set in the consolidation zone is arranged up and down, and the cross-sectional shape of the horizontal bars is a horizontal anchor shape, and the horizontal part of the horizontal anchor shape is 20–30 cm long; the anchor hook part of the horizontal anchor shape is Reverse streamlined, with a length of 10-15cm; the height of the anchor hook is the entire height of the bar, which is 10-30cm; the distance between two adjacent bars is 1.0-2.0 times the height of the bar; The distance between two adjacent groups of horizontal bars shall be 1.0~2.0 times of the section length of the horizontal bars, and the offset between two adjacent groups of horizontal bars shall be set.

Further, at the entrance of the condensation zone, a group of nozzles are vertically arranged, and the nozzles are connected to the air pump through pipelines, and adsorbents such as activated carbon can be sprayed into the condensation zone through the nozzles through the guide pipe.

Further, at the entrance of the condensation zone, a group of nozzles are vertically arranged, and the coagulation accelerator and water are fully mixed by the liquid distribution pump. After the mixed coagulation accelerator solution is atomized, it is connected to the Nozzles are sprayed into the condensation zone to form fog clouds.

The working principle of the condenser: the air flow first passes through the bipolar charging area. The bipolar charging area has a set of positive and negative parallel channels. In this way, the dust particles are half positively charged and half negatively charged. Then enter the coagulation zone, where positively charged particles and negatively charged particles collide and condense under the joint action of "electrostatic coagulation", "turbulent coagulation" and "chemical coagulation", and ultrafine particles become large particles, Referred to as particle coarsening; then it enters the interior of the subsequent main body dust collector (electric precipitator or bag filter), and the coarsened particles are convenient for dust collection by the dust collector, thus reducing the emission of fine particles.

"Turbulent condensation" refers to the change of the flue gas flow through a special structure, forming a state close to turbulence. The main influencing factors of coagulation are particle size, coagulation performance and collision probability of particles. There is no lack of large particles in the dust to be treated, and large particles can be used as nuclei to collide with ultrafine particles to form larger particles. In terms of condensation performance: the airflow first passes through the bipolar charging area to obtain positive or negative charges respectively. In this way, half of the dust particles are positively charged and half are negatively charged. In the condensation zone, the positively charged particles and negatively charged particles have good coagulation performance under the action of "electrostatic force". Turbulence greatly increases the chances of particle collisions in the flue gas. Due to the special structure of the condenser, the intersection of sub-airflows in the condenser becomes the main area where turbulent condensation occurs. On the basis of electrostatic force and chemical coagulation, the overall coagulation effect is enhanced through turbulent coagulation. The cross-sectional shape of the horizontal bar in the condenser is a horizontal anchor shape, and the horizontal part of the horizontal anchor shape plays the role of separating and guiding the airflow; , and the streamlined pressure drop is small, the diverted partial airflow collides with the horizontal and straight airflow relatively strongly, the probability of particle collision is significantly increased, and the optimization of turbulent flow condensation is realized.

The principle of chemical coagulation: the sprayed coagulation accelerator is broken under the action of the atomizer to form a mist cloud with a certain diffusion angle and a high adhesion activity on the surface. The mist cloud is adsorbed on the surface of the fly ash particles, A liquid bridge is formed between them, and in the flue in front of the bag filter, it is transformed into a solid bridge, which promotes the coagulation of particles, makes fine particles form larger agglomerates, and fine particles are adsorbed by coarse particles.

The activated carbon adsorbent injection device used in the present invention sprays powdered activated carbon before the particles are coagulated, and removes mercury in the flue gas through the adsorption of the activated carbon adsorbent. Spraying activated carbon adsorbent in flue gas is one of the most effective methods for mercury removal. The adsorbent is a porous particle with a rich specific surface area formed by modifying and activating fly ash with a certain carbon content. It has ^both physical and chemical adsorption functions. g, the carbon content of fly ash is about 6%~7%.

Beneficial effects: compared with the existing devices, the device provided by the invention has the following advantages.

(1) Through the special angular structure provided by the present invention, a variety of coagulation synergies have improved the coagulation efficiency, and the number concentration of PM _2.5 in the dust particles is reduced by 30% to 50% compared with that before coagulation, and the mass concentration is higher than that of coagulation. And before the decline of 10 ~ 20%.

(2) The present invention mainly condenses the ultrafine particles before the main dust removal device, so that they can be removed under the action of the main dust collector. The device provided by the present invention can improve the removal of ultrafine particles by the main dust collector. Removal efficiency, reduce the emission of ultra-fine smoke. Under the same working condition and collection mode of the main dust collector, the removal rate of PM _2.5 in the dust can be increased by 30% to 50%.

(3) Each part of the condenser provided by the present invention has reasonable divisions and compatible functions.

(4) The condenser provided by the present invention creates conditions for volume reduction of the main dust collector (electric dust collector or bag filter).

(5) The condenser provided by the present invention significantly reduces the emission of toxic heavy metals such as PM _2.5 and mercury.

(6) The condenser provided by the present invention has various functions and flexible adjustment. It can enhance the removal of toxic heavy metals such as mercury and arsenic by spraying activated carbon and other adsorbents. It can strengthen the condensation effect by spraying chemical polymer adsorbents; Compared with the physical control system, on the premise of realizing multi-function, it reduces investment, simplifies operation, has small resistance loss, reduces pressure, reduces energy consumption, and low operating cost.

(7) It is easy to install and has a wide range of applications. It is suitable for pretreatment before various main dust collectors, and also improves the adaptability of electrostatic precipitators or bag filter to various industrial fumes.

Description of drawings

Fig. 1 is a schematic diagram of the structure of a horizontally anchored pipe-type ultrafine particle coalescer provided by the present invention.

Fig. 2 is a schematic diagram of the coagulation principle of ultrafine particles in the present invention.

In Figure 1, 2: 1: charging area, 2: condensation area, 3: negative plate, 4: insulating plate, 5: positive plate, 6: horizontal bar, 7: guide tube, 8: nozzle, 9: Particles before coagulation, 10: Coagulated large particles after coagulation, A: The main area where turbulent coagulation occurs.

detailed description

The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

Example 1

An industrial flue dust waste gas with a processing capacity of 100,000m ³ /h adopts a horizontal anchor type pipeline type ultrafine particle condenser. The entire condenser is in the pipeline type, installed in the main dust collector - electrostatic precipitator, in the intake pipe before; the condenser is composed of a bipolar charging area and a condensation area; the bipolar charging area has a set of positive and negative Alternate parallel channels, with negative plates, positive plates and insulating plates used for separation, the dust in the flue gas enters the condensation area after being charged; there are 3 sets of horizontal bars in the condensation area, and the cross-sectional shape of the bars is It is in the shape of a horizontal anchor; the condensed flue gas enters the main dust collector for treatment.

Each group of horizontal bars set in the congealing zone is arranged up and down. The cross-sectional shape of the horizontal bars is a horizontal anchor shape, and the horizontal part of the horizontal anchor shape is 30 cm long; the anchor hook part of the horizontal anchor shape is reverse streamlined. , the length is 10cm; the height of the anchor hook part is the entire height of the horizontal bar, which is 20cm; the distance between two adjacent horizontal bars is 1.5 times the height of the horizontal bar; the distance between two adjacent horizontal bars is taken as horizontal 1.5 times the length of the bar section, and the offset between two adjacent groups of horizontal bars is set. In Fig. 2, A is the region where turbulent condensation mainly occurs.

At the entrance of the condensation zone, a group of nozzles is vertically set up, and the coagulation accelerator and water are fully mixed by the liquid distribution pump. After the mixed coagulation accelerator solution is atomized, it is connected to the nozzle through the guide pipe, sprayed Into the condensation area, forming fog clouds. The mass percentage of the coagulation accelerator in water is 1.5%; the volume percentage of the coagulation accelerator solution in the flue gas flow is 0.1%. After the flue gas has been treated by electrostatic precipitator, the flue gas that has been purified and meets the emission standard is discharged from the exhaust pipe through the induced draft fan.

Using the condenser provided by the present invention to carry out enhanced condensation, followed by the main dust collector, the total dust removal efficiency of the whole process is over 99.98%, the dust emission concentration of the flue gas is less than 30mg/Nm ³ , and the removal rate of PM _2.5 in the exhaust flue gas is improved 50%.

Claims (4)

1. a kind of horizontal anchor type duct type ultra-fine grain coalescer, it is characterised in that：Whole coalescer is in duct type, is suitable to install In admission line before main body deduster；Described coalescer by charging area and coalescence district's groups into；Described charging area has One group of positive and negative alternate parallel channels, inside sets negative plate, positive plate and the insulation board for separating, the dust in flue gas Grain enters coalescence area after charged；2 ~ 4 groups of horizontal stripes are provided with described coalescence area, horizontal stripe is horizontally placed in coalescence area, horizontal stripe Section configuration is horizontal anchor；Processed into main body deduster through the flue gas after coalescence.

2. coalescer as claimed in claim 1, the every group of horizontal stripe set in coalescence area is arranged above and below, and the section configuration of horizontal stripe is Horizontal anchor, a length of 20 ~ 30 cm of horizontal component of horizontal anchor；The grasp part of horizontal anchor is in backward aerofoil, and length is 10~15cm；The height of grasp part is the whole height of horizontal stripe, takes 10 ~ 30cm；Spacing between adjacent two horizontal stripes takes horizontal stripe 1.0 ~ 2.0 times of height；Spacing between two adjacent groups horizontal stripe takes 1.0 ~ 2.0 times of horizontal stripe section length, two adjacent groups horizontal stripe Between shift to install.

3. coalescer as claimed in claim 1, in the porch in coalescence area, vertically arranged one group of nozzle, nozzle passes through pipeline It is connected with air pump, the adsorbents such as activated carbon can be sprayed into coalescence area by guiding tube through nozzle.

4. coalescer as claimed in claim 1, in the porch in coalescence area, vertically arranged one group of nozzle, by will be solidifying with liquid pump And accelerator and water are sufficiently mixed, after mixed coalescence accelerator solution is through atomization, nozzle is accessed by guiding tube, sprayed into solidifying And area, form mist cloud.