CN206810000U - One kind crosses formula speed change ultra-fine grain coalescence case - Google Patents

Abstract

A converging variable-speed superfine particle coagulation box, the whole coagulation box is box-shaped, 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 is the channel after the electrostatic precipitator, and the flue gas comes from the electrostatic precipitator; the condensation area is equipped with a wave-shaped partition, and the dust particles are strengthened and condensed in the channel between the wave-shaped partitions; the gas outlet It is located in the lower part of the condensation area and above the ash hopper. It is set as an overflow channel. Adsorbents such as activated carbon, condensation accelerators, etc. can be sprayed into the condensation area through the nozzle through the guide pipe, and the flue gas after condensation enters the bag dust collector. device for processing. The utility model has strong pertinence, wide adaptability, optimized structure and good reliability.

Description

A converging variable speed superfine particle coagulation box

technical field

The utility model belongs to the field of flue gas dedusting treatment, and relates to an intersection-type variable-speed 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 air chamber and communicated with the clean air chamber; the adsorbent injection device and the adsorbent container are set on the top of the electric bag transition zone, and the outlet of the adsorbent container is connected with the feed port 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.

Utility model content

Purpose of the utility model: The purpose of this utility model 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 purpose of the utility model, the utility model adopts the following technical solutions.

A converging variable-speed superfine particle coagulation box, the whole coagulation box is box-shaped, 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 is the channel after the electrostatic precipitator, and the flue gas comes from the electrostatic precipitator; the condensation area is equipped with a wave-shaped partition, and the dust particles are strengthened and condensed in the channel between the wave-shaped partitions; the gas outlet Located at the lower part of the condensation area and above the ash hopper, it is set as a flow passage, and the flue gas after condensation enters the bag filter for treatment; the ash hopper is set under the condensation area, and is connected with other ash hoppers of the electrostatic-bag filter flush.

Furthermore, the wave-shaped partitions set in the condensation area are arranged horizontally; the waveform changes of the two adjacent wave-shaped partitions are arranged correspondingly, forming a channel for the change of the flow cross section; between the two adjacent wave-shaped partitions Interconnected, there is an intersection section, and the intersection section is set at intervals; the height of the wave-shaped partition is 10-15cm; the distance between two adjacent wave-shaped partitions is 30-40cm.

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 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, channels with constantly changing cross-sections are formed between the wavy partitions, which makes the flow velocity of the passing air constantly change. The particles in it cannot completely change with the change of the flow velocity of the air flow due to the difference in density with the smoke, especially the larger particles have inertia, and the response to speed changes is delayed than that of ultrafine particles. Therefore, when flowing in a corrugated channel, there is an obvious velocity gradient between large particles and ultrafine particles at the point where the velocity of the partial airflow changes. This velocity gradient can increase the probability of particle collision and significantly enhance the coagulation effect. The part where the flow velocity of the partial air flow in the condenser changes becomes the main area where turbulent condensation occurs. There is an intersecting section between two adjacent wavy partitions, so that particles of different sizes are not limited to the original channel, but intersect with the upper and lower channels, further increasing the probability of particle collision, and further reflecting the velocity gradient. 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 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 special structure provided by the utility model, the coagulation efficiency is improved. The number concentration of PM _2.5 in the dust particles is reduced by 40%-60% compared with that before coagulation, and the mass concentration is decreased by 5-15% compared with that before coagulation. .

(2) The condensation tank provided by the utility model significantly reduces the emission of PM _2.5 . The utility model mainly coagulates the superfine particles before the bag filter, so that they can be removed under the action of the bag filter. The removal efficiency of particulate matter reduces the emission of ultrafine 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 utility model is reasonably partitioned and compatible with functions.

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

(5) The condensing tank provided by the utility model reduces investment, simplifies operation, has small resistance loss, reduces pressure, reduces energy consumption, and has low operating costs.

(6) The condensing box provided by the utility model 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 smoke and dust.

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

Description of drawings

Figure 1 is a schematic diagram of the structure of a converging variable-speed ultrafine particle coagulation box provided by the utility model.

In Figure 1: 1: Electrostatic precipitator, 2: Bag filter, 3: Condensation box, 4: Air inlet, 5: Condensation zone, 6: Air outlet, 7: Ash hopper, 8: Wave Separator, 9: guide pipe, 10: nozzle, 11: baffle, A: the place where the flow velocity of the sub-section changes, B, C, D: the different cross-sections of the flow channel, E: the intersection of the sub-section.

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 the condensing box provided by the utility model. 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; the condensation area is equipped with a wave-shaped partition, and the dust particles are strengthened in the channel between the wave-shaped partitions; the gas outlet is located at the lower part of the condensation area and above the ash hopper Through the flow passage, the flue gas after condensation enters the bag filter for treatment; the ash hopper is set under the condensation area, flush with other ash hoppers of the electrostatic-bag filter.

The wave-shaped partitions set in the condensation area are arranged horizontally; the two adjacent wave-shaped partitions are not connected, and the waveform changes correspond to each other, forming a channel for the change of the flow section; the height of the wave-shaped partition is 10cm; The distance between two adjacent corrugated partitions is 30cm. In Fig. 1, the flow velocity of the partial air flow is V _D >V _C >V _B , A is the point where the flow velocity of the partial air flow changes, and E is the intersection of the partial air flow, which is also where the turbulent condensation caused by the velocity gradient mainly occurs area.

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 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%. 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 utility model is used to carry out enhanced coagulation, followed by a bag filter. 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 20mg/Nm ³ , and the removal rate of PM _2.5 is increased by 60%. .

Claims (4)

1. A converging variable-speed superfine particle coagulation box is characterized in that: the whole coagulation box is box-type, suitable for being installed between electric-bag dust collectors; the coagulation box is composed of an air inlet, an outlet Composed of air inlet, condensation area and ash hopper; the air inlet is the passage behind the electrostatic precipitator, and the flue gas comes from the electrostatic precipitator; the condensation area is equipped with a wave-shaped partition, and the dust particles Intensified condensation is carried out in the channel between; the gas outlet is located at the lower part of the condensation area, above the ash hopper, and is set as a flow passage, and the flue gas after condensation enters the bag filter for processing; the ash The bucket is set under the coalescing area and is flush with other dust buckets of the electrostatic-bag filter. 2. The coagulation tank as claimed in claim 1, the wave-shaped partitions arranged in the coagulation area are arranged horizontally; the adjacent two wave-shaped partitions are arranged correspondingly to the wave changes, forming a channel for the change of the flow cross section; Two adjacent wavy partitions are connected, and there is an intersection section, which is set at intervals; the height of the wavy partitions is 10~15cm; the distance between two adjacent wavy partitions is 30~40cm. 3. The condensing tank as claimed in claim 1, at the entrance of the condensing area, a group of nozzles are arranged vertically, the nozzles are connected to the air pump through the pipeline, and adsorbents such as activated carbon can be carried by the air flow and sprayed into the condensing Area. 4. The coagulation tank as claimed in claim 1, at the entrance of the coagulation area, a group of nozzles are vertically arranged, and the coagulation accelerator and water are fully mixed by the liquid distribution pump, and the coagulation accelerator solution after mixing is After atomization, it is connected to the nozzle through the guide tube and sprayed into the condensation area to form a fog cloud.