CN207024989U - A kind of streamline ductwork formula ultra-fine grain coalescer - Google Patents

Abstract

A streamlined pipe-type ultra-fine particle coalescer, which is pipe-type and is suitable for installation in the 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, The parallel channels between the negative and negative phases 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; The bar is placed horizontally in the condensation area, and the cross-section of the bar is in the shape of a streamlined missile head; the condensed flue gas enters the main dust collector for treatment. The utility model has strong pertinence, wide adaptability, simple structure and good reliability.

Description

A streamlined pipeline ultrafine particle coalescer

technical field

The utility model belongs to the field of flue gas dedusting treatment, and relates to a streamlined 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 downwards, 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.

Utility model content

Purpose of the utility model: The purpose of this utility model 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 coagulation.

Technical solution: In order to realize the purpose of the utility model, the utility model adopts the following technical solutions.

A streamlined pipe-type ultra-fine particle coalescer, the entire condenser is pipe-type, suitable for installation in the intake pipe before the main dust collector; the condenser is composed of a charging area and a condensation area; the charging area There is a group of positive and negative parallel passages with negative plates, positive plates and insulating plates for separation. The dust particles in the flue gas enter the condensation area after being charged; the condensation area is equipped with 2 ~4 groups of horizontal bars, horizontal bars are placed in the condensation area, the cross-section shape of the horizontal bars is streamlined missile head shape; the flue gas after condensation enters the main dust collector for treatment.

Further, each group of horizontal bars set in the coalescence zone is arranged up and down, the cross-sectional shape of the horizontal bars is 10-15 cm long for the missile head, and 20-30 cm long for the horizontal part; the height of the horizontal bars is 15-30 cm; The distance between two horizontal bars shall be 1.0 to 2.0 times the height of the horizontal bars; the distance between two adjacent groups of horizontal bars shall be 1.0 to 2.0 times 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 is like a missile head, and the missile head is streamlined, which is convenient for airflow diversion, and the streamlined shape has a small pressure drop. The horizontal part of the bar section plays the role of separating and guiding the airflow. The streamlined horizontal bar makes the air flow separate and close alternately, realizing the optimization of turbulent flow condensation.

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 adopted in the utility model is to inject powdered activated carbon before the particles are coagulated, and remove 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 utility model has the following advantages.

(1) Through the angular special structure provided by the utility model, various coagulation synergies can improve the coagulation efficiency, and the number concentration of PM _2.5 in the dust particles is reduced by 30%~50% compared with that before coagulation, and the mass concentration is higher than that before coagulation. Decrease 10~20% before coagulation.

(2) The utility model mainly condenses the ultrafine particles before the main body dust removal device, so that they can be removed under the action of the main body dust collector. The device provided by the utility model can improve the performance of the main body dust collector on ultrafine particles. The removal efficiency is high, and the emission of ultrafine smoke is reduced. 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 utility model is reasonably partitioned and compatible with functions.

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

(5) The condenser provided by the utility model significantly reduces the emission of PM _2.5 and mercury and other toxic heavy metals.

(6) The condenser provided by this utility model has various functions and flexible adjustment. It can be sprayed into activated carbon and other adsorbents to enhance the removal of mercury, arsenic and other toxic heavy metals, and sprayed into chemical polymer adsorbents to enhance the coagulation effect; Compared with the pollutant control system, on the premise of realizing multiple functions, 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 streamlined pipeline type ultrafine particle coalescer provided by the utility model.

Fig. 2 is a schematic diagram of the coagulation principle of ultrafine particles in the utility model.

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

Below in conjunction with accompanying drawing and specific embodiment, further illustrate the utility model.

Example 1

An industrial smoke and dust waste gas with a treatment capacity of 80,000m ³ /h adopts a streamlined pipeline 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 streamlined missile head; the condensed flue gas enters the main dust collector for processing.

Each group of horizontal bars set in the condensate area is arranged up and down, the cross-sectional shape of the horizontal bar is 10 cm long for the missile head, and the length of the horizontal part is 20 cm; the height of the horizontal bar is 20 cm; the distance between two adjacent horizontal bars is taken as 1.0 times the height of the horizontal bars; the distance between two adjacent groups of horizontal bars is 1.0 times the length of the horizontal bar section, and the two adjacent groups of horizontal bars are misplaced. In Fig. 2, A is the region where turbulent condensation mainly occurs.

At the entrance of the condensation area, 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 zone, 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.

The ultra-fine particle coalescer provided by the utility model is used to strengthen the coalescence, followed by the main dust collector. The total dust removal efficiency of the whole process is more than 99.98%, the dust emission concentration of the flue gas is less than 30mg/Nm ³ , and the PM in the exhaust flue gas _2.5 The removal rate increased by 50%.

Claims (4)

1. A kind of 1. streamline ductwork formula ultra-fine grain coalescer, it is characterised in that：Whole coalescer is in duct type, is adapted to mount to In admission line before main body deduster；Described coalescer by charging area and coalescence district's groups into；Described charging area has one The positive and negative alternate parallel channels of group, inside set negative plate, positive plate and the insulation board for separating, the dust granules in flue gas Enter coalescence area after charged；2 ~ 4 groups of horizontal stripes are provided with described coalescence area, horizontal stripe is horizontally placed in coalescence area, and horizontal stripe breaks Face is shaped as fairshaped guided missile head；Flue gas after coalescence is handled into main body deduster.
2. 2. coalescer as claimed in claim 1, it is characterised in that：The every group of horizontal stripe set in coalescence area is arranged above and below, horizontal stripe Section configuration nose of missile length be 10 ~ 15cm, a length of 20 ~ 30 cm of horizontal component；The height of horizontal stripe is 10 ~ 20cm；It is adjacent Spacing between two horizontal stripes takes 1.0 ~ 2.0 times of horizontal stripe height；Spacing between two adjacent groups horizontal stripe takes horizontal stripe section length 1.0 ~ 2.0 times, shift to install between two adjacent groups horizontal stripe.
3. 3. coalescer as claimed in claim 1, it is characterised in that：In the porch in coalescence area, vertically arranged one group of nozzle, spray Mouth is connected by pipeline with air pump, and acticarbon is sprayed into coalescence area through nozzle by guiding tube.
4. 4. coalescer as claimed in claim 1, it is characterised in that：In the porch in coalescence area, vertically arranged one group of nozzle, by Coalescence accelerator and water are sufficiently mixed with liquid pump, mixed coalescence accelerator solution is accessed after atomization by guiding tube Nozzle, coalescence area is sprayed into, form mist cloud.