CN106621665A - Combined ultrafine particle coagulation box - Google Patents

Abstract

Combined ultrafine particle coagulation box, the whole coagulation box is box-type, suitable for installation between electric-bag dust collectors; the coagulation box is composed of an air inlet, an air outlet, a coagulation area and an ash hopper; the air inlet The mouth is the channel after the electrostatic precipitator, and the flue gas comes from the electrostatic precipitator; there are 2~4 sets of horizontal bars in the condensation area, and the horizontal bars are placed horizontally in the condensation area. The air outlet is located in the lower part of the condensation area and above the ash hopper, and is set as a flow channel; the activated carbon and other adsorbents and condensation accelerators can be sprayed into the condensation area through the nozzle through the guide pipe, and after the condensation And then the flue gas enters the bag filter for treatment. The invention has strong pertinence, wide adaptability, optimized structure and good reliability.

Description

Combined ultrafine particle coagulation box

technical field

The invention belongs to the field of flue gas dust removal treatment, and relates to a combined superfine particle coagulation box.

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 CN 102423599 A discloses an electric bag composite purification device and purification method for integrated removal of ultrafine and trace pollutants discharged from industry. Adopting the structural form of adsorbent pre-spraying device, electrostatic precipitator, ultrafine particle coagulation device, adsorbent spraying device and bag dust removal device arranged in sequence along the airflow direction, it provides a compact structure, low operating cost, maintenance and The integrated electric bag composite purification device and purification method are convenient for operation and maintenance, and can efficiently remove ultrafine and trace pollutants while removing constant dust pollutants. The superfine particle coagulation device is composed of positive high voltage discharge electrodes and so on. The superfine particle coalescence device has no specific structure, and does not form a good coalescence condition except charging. Chinese patent CN103007670 A is an electric bag composite dust collector for controlling fine particles and synergistically removing mercury, which relates to industrial dust collectors. The electric bag composite dust collector is equipped with an electric bag transition area, which is set between the electric field area and the bag type dust removal area; the ash hopper is set at the bottom of the shell, and the clean air chamber is set The channel is set on the top of the clean gas chamber and communicated with the clean gas room; the adsorbent injection device and the adsorbent container are set on the top of the transition zone of the electric bag, and the outlet of the adsorbent container is connected with the inlet of the adsorbent injection device . The sorbent can be fully mixed with the flue gas, the sorbent can be distributed more uniformly, and the sorbent can have a better mercury removal effect. There are at least two sets of anode plates and discharge electrodes in the transition zone of the electric bag, and the anode plates and discharge electrodes form an electric field channel.

The above process equipment has complex methods, difficult control and operation, high equipment investment and operation costs.

Therefore, in view of the problems of low coagulation efficiency and complicated process equipment, it is necessary to research and develop ultra-fine particle coagulation boxes 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 or physical and chemical methods, so that they can be successfully removed in the subsequent 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 to propose an ultra-fine particle coagulation box with strong pertinence, wide adaptability, optimized structure, and good reliability for enhanced coagulation.

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

Combined ultrafine particle coagulation box, the whole coagulation box is box-type, suitable for installation between electric-bag dust collectors; the coagulation box is composed of an air inlet, an air outlet, a coagulation area and an ash hopper; the air inlet The mouth is the channel after the electrostatic precipitator, and the flue gas comes from the electrostatic precipitator; there are 2~4 sets of horizontal bars in the condensation area, and the horizontal bars are placed horizontally in the condensation area. The air outlet is located at the lower part of the condensation area and above the ash hopper, which is set as a flow passage, and the condensed flue gas enters the bag filter for processing; the ash hopper is set under the condensation area, and The other ash hoppers of the electric-bag dust collector are flush.

Further, each group of horizontal bars set in the condensation zone is arranged up and down, the angular opening angle of the horizontal bars is 70-120 degrees; the height of the horizontal bars is 10-25 cm; The diameter of the circle is 10~25cm; the height of the corner shape and the circle should be the same; the distance between two adjacent horizontal bars shall be 1.0~2.0 times the height of the horizontal bar; the distance between two adjacent horizontal bars shall be the horizontal 1.0~2.0 times the length of the bar section, and the offset between two adjacent groups of bars is set.

Further, at the entrance of the condensation area, a sieve plate is set to let the air flow pass through; a group of nozzles are vertically set behind the sieve plate, and the nozzles are connected to the air pump through a pipeline, and activated carbon and other adsorbents can be sprayed through the nozzles through the guide pipe. into the condensation zone.

Furthermore, a set of nozzles is set in the condensation area, 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 and sprayed into the condensation. Combined area, forming fog cloud.

The working principle of the condensing box: the flue gas treated by the electrostatic precipitator then enters the condensation zone. At this time, the flue gas is mostly composed of ultra-fine particles. Through collision and condensation under the action of "turbulent coagulation", the ultra-fine particles become large particles, that is, Coarse particles; then enter the follow-up bag filter, the coarse particles are easy for the dust collector to collect dust, thus reducing the emission of ultrafine 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. 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 chemical coagulation, turbulent coagulation is further used to strengthen the overall coagulation effect. The sieve plate plays the role of rectifying and evenly distributing the airflow. When the airflow passes through the circular bar, it is streamlined, which reduces the pressure drop while forming turbulent 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 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 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 40% to 60% compared with that before coagulation, and the mass concentration is higher than that of coagulation The previous drop was 5~15%.

(2) The condensation tank provided by the present invention significantly reduces the emission of PM _2.5 . The present invention mainly condenses ultrafine particles before the bag filter so that they can be removed under the action of the bag filter. Removal efficiency, reduce the emission of ultra-fine smoke. Under the same working condition and collection mode of the dust collector, the removal rate of PM _2.5 in the dust can be increased by 40%~60%.

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

(4) The condensing box provided by the present invention creates conditions for the capacity reduction of the electric-bag dust collector.

(5) 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.

(6) The condensing box provided by the present invention is easy to install and has a wide range of applications. It is suitable for pretreatment before various bag-type dust collectors, and also improves the adaptability of electric-bag dust collectors to various industrial fumes.

(7) The condensation box provided by the present invention provides a new idea for the transformation of the electrostatic precipitator.

Description of drawings

Figure 1 is a schematic diagram of the structure of the combined ultrafine particle coagulation box 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: Electrostatic precipitator, 2: Bag filter, 3: Condensation box, 4: Air inlet, 5: Condensation area, 6: Air outlet, 7: Ash hopper, 8: Angular horizontal bar, 9: particles before coagulation, 10: large particles after coagulation, 11: sieve plate, 12: guide pipe I, 13: nozzle, 14: guide pipe II, 15: baffle plate, 16: Circular horizontal bar, A: the area where turbulent condensation mainly occurs.

detailed description

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

Example 1

An industrial smoke and dust waste gas with a treatment capacity of 80,000m ³ /h adopts the condensing box provided by the present invention. The entire condensing box is box-shaped, suitable for installation between electrostatic-bag dust collectors; the condensing box is composed of an air inlet, an air outlet, a condensing area and an ash hopper; the air inlet is the passage behind the electrostatic precipitator, The flue gas comes from the electrostatic precipitator; there are 4 sets of horizontal bars in the condensation area, and the horizontal bars are placed horizontally in the condensation area. The lower part of the merging area and the upper part of the ash hopper are set as flow passages, and the condensed flue gas enters the bag filter for treatment; the ash hopper is set under the condensing area, flush with other ash hoppers of the electrostatic-bag filter .

Each group of horizontal strips set in the condensation zone is arranged up and down, the angular opening angle of the horizontal strips is 90 degrees; the height of the horizontal strips is 15cm; the cross-sectional shape arranged alternately is circular horizontal strips, and the diameter of the circle is 15cm; The distance between two adjacent horizontal bars shall be 1.5 times the height of the horizontal bars; the distance between two adjacent groups of horizontal bars shall be 1.5 times the section length of the horizontal bars. In Fig. 2, A is the region where turbulent condensation mainly occurs.

At the entrance of the condensation area, a sieve plate is set to let the air flow through; a group of nozzles are vertically installed behind the sieve plate, and the nozzles are connected to the air pump through a pipeline, and activated carbon and other adsorbents can be sprayed into the condensation through the nozzles through the guide pipe. Area.

Set a group of nozzles in the condensation area, 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 and sprayed into the condensation area. Fog clouds form. 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%. The flue gas treated by bag dust removal is discharged from the exhaust pipe through the induced draft fan.

The device is used to condense ultra-fine dust into particles with larger particle size, and remove them through the bag filter. The coagulation box provided by the present invention is used to carry out enhanced coagulation, followed by a bag filter. The total dust removal efficiency of the whole process is over 99.98%, the dust emission concentration of the flue gas is less than 20mg/Nm ³ , and the removal rate of PM _2.5 is increased by 60%.

Claims (4)

1. combined ultra-fine grain coalescence case, it is characterised in that：Whole coalescence case is adapted to mount to electricity-bag dust collector in box Between；Described coalescence case is made up of air inlet, gas outlet, coalescence area and ash bucket；Described air inlet is after electric cleaner Passage, flue gas is by electric cleaner；2 ~ 4 groups of horizontal stripes are provided with described coalescence area, horizontal stripe is horizontally placed in coalescence area, it is horizontal The section configuration of bar is angular and circle, and alternate combinations successively；Described gas outlet is located above coalescence area bottom, ash bucket, It is arranged to flow channels, the flue gas after Jing coalescences is processed into sack cleaner；Described ash bucket is arranged at coalescence area Lower section, it is concordant with other ash buckets of electricity-bag dust collector.

2. coalescence case as claimed in claim 1, the every group of horizontal stripe arranged in coalescence area is arranged above and below, the angular angular aperture of horizontal stripe Spend for 70 ~ 120 degree；The height of horizontal stripe is 10 ~ 25cm；The section configuration that alternate intervals are arranged is circular horizontal stripe, and circular is straight Footpath is 10 ~ 25cm；It is angular consistent with circular height；Spacing between adjacent two horizontal stripes takes the 1.0 ~ 2.0 of horizontal stripe height Times；Spacing between two adjacent groups horizontal stripe takes 1.0 ~ 2.0 times of horizontal stripe section length, shifts to install between two adjacent groups horizontal stripe.

3. coalescence case as claimed in claim 1, in the porch in coalescence area, arranges sieve tray, allows air-flow to pass through；After sieve tray Vertically arranged one group of nozzle, nozzle is connected by pipeline with air pump, can be sprayed the adsorbents such as activated carbon by guiding tube Jing nozzles Enter coalescence area.

4. coalescer as claimed in claim 1, arranges one group of nozzle in coalescence area, by with liquid pump by coalescence accelerator and water It is sufficiently mixed, mixed coalescence accelerator solution accesses nozzle Jing after atomization by guiding tube, sprays into coalescence area, forms mist Cloud.