CN204620215U - A kind of wet electrical dust precipitator anode - Google Patents

Abstract

The utility model provides a kind of wet electrical dust precipitator anode, belongs to field of environment engineering.This electric dust-collector anode is made up of more than one anode unit, and anode unit is hexagon alveolate texture, and six limits are 165 degree of circular arcs, and adjacent two sections of circular arcs form 120 degree of angles.This electric dust-collector anode is bamboo composite material.Bamboo composite material thickness is 0.5-2.5mm; Bamboo composite material is the composite formed after thin bamboo strips used for weaving top layer spraying plating high connductivity material Graphene.Not only corrosion resistance is strong, lightweight for the utility model, cost is low, its rigidity with generally use at present rigid anode---fiberglass is suitable; And pliability and corrosion resistance are considerably beyond flexible anode---the cloth bag generally used at present.It is too large that this bamboo composite material anode solves existing anode weight, and pedestal cannot load-bearing, and anode is easily corroded, and cost is high, the problem that energy consumption is large.And the anode after using can resource circulation utilization.

Description

An anode of a wet electrostatic precipitator

technical field

The utility model relates to the field of environmental engineering, in particular to an anode of a wet electric dust collector.

Background technique

In recent years, air pollution has become more and more serious, and it has attracted more and more attention. Sulfur dioxide, nitrogen oxides and inhalable particulate matter are the main components of smog. The first two are gaseous pollutants. They combine with fog to make the sky instantly gray and the air quality worse.

From January 1, 2015, the new environmental protection law and new emission standards for the steel industry were officially implemented. At present, there is still a big gap between the environmental protection level of my country's iron and steel industry and the new environmental protection requirements. Iron and steel enterprises must truly establish the concept of "environmental protection is the lifeline of the enterprise", increase investment in environmental protection, focus on waste gas treatment to implement environmental protection transformation, comprehensively improve the level of environmental protection, and realize green transformation.

In the new standard, the new emission standard for sintering head (pellet) particles is 50mg/m ³ , and the special emission limit is 40mg/m ³ . With wet electrostatic precipitators installed, the particle emission concentration can generally only reach 50-80mg/m ³ , which is difficult to meet the standard. The new emission standards for particulate matter in iron and steel enterprises’ raw material systems, sinter tails, blast furnace casting plants, blast furnace troughs, converter secondary flue gas, and other dust-generating points are 10-30 mg/m ³ , but most iron and steel enterprises’ dust removal systems The design emission concentration is 30-50mg/m ³ . For example, the tail of the sintering machine and a few blast furnaces still use electrostatic precipitators. The emission concentration is higher.

During the development process of most iron and steel enterprises, with the continuous expansion of scale, the processing capacity of the dust removal system is often difficult to meet the actual production needs, or the flue gas collection rate is underestimated in the initial design. As a result, a large amount of smoke and dust generated during the production process cannot be collected and purified by the dust collector, and part of the smoke and dust escapes from the factory building, resulting in unorganized emissions and affecting the company's environmental protection image. In addition, the dust from the material yard on the road in the factory area, the unsealed belt corridor, and the lack of a dust removal system at the transfer station have all resulted in a large amount of unorganized emissions from iron and steel enterprises.

Due to the high desulfurization efficiency of wet desulfurization, there are currently more than 500 sintering (pellet) equipment in China using wet desulfurization technology. Electrostatic precipitator.

Existing wet type electrostatic precipitator has at present, as Chinese patent: CN202876595U " a kind of flexible anode wet type precipitator "; CN203061287U " a kind of flexible anode wet type precipitator of two-way water spray "; Method of use"; CN102872669A "a flexible anode wet dust collector with a hard grid layer"; CN204074267U "wet electric dust collector anode unit".

There are two types of wet dust collectors, flexible anode and rigid anode. The flexible anode is mainly based on the bag filter. The bag filter is easy to be broken down by electricity, and the dust with high humidity is easy to stick to the surface of the bag. The rigid anode is mainly made of FRP, but FRP is expensive, heavy and easy to corrode.

Utility model content

The purpose of the utility model is to solve the problems of heavy weight, easy to corrode, high price, easy to be broken down, easy to stick to the wall and other problems of the anode of the current wet electrostatic precipitator, and a utility model of an anode of the wet electrostatic precipitator.

The anode of the wet electrostatic precipitator is composed of more than one anode unit, the anode unit is a hexagonal honeycomb structure, the six sides are 165-degree arcs, and two adjacent arcs form a 120-degree angle. The anode unit is made of bamboo composite material coated with graphene on the surface of bamboo strips. The thickness of bamboo strips is 0.5-2.5mm, the length is 2-10m, and the width is 100-300mm; The upper and lower surfaces of the bamboo strips are single-layer coated, and the bamboo strips themselves are curved sheets.

In order to ensure the dust removal effect and the stability of the equipment, it is necessary to control the length of the bamboo strips. The length of the bamboo strips should not be too short. The shorter the bamboo strips, the more anode units are required, which increases the resistance of the dust collector system, increases energy consumption, and reduces the dust removal effect. The length of the bamboo strips of the utility model is controlled above 2m. After repeated tests and computer simulations, it was found that the length of the bamboo strips should not exceed 10m. Once the length exceeds 10m, the vibration frequency of the anode will increase, and its stability will decrease exponentially.

The width of the bamboo strips is also a major factor to ensure the dust removal effect of the wet electrostatic precipitator and the stability of the equipment. After repeated tests and computer simulations, it was found that the width of the bamboo strips determines the size of the discharge voltage. If the width is too narrow, the required anode units will increase greatly. The minimum width of the bamboo strips is 100mm. If the width of the bamboo strips is too large, the discharge voltage will increase, and various hidden dangers will increase. After repeated tests and computer simulations, it was found that when the width of the bamboo strips exceeds 300mm, the strength of the electromagnetic field around the wet electrostatic precipitator increases significantly, and suddenly rises to 15 times that of 300mm. Considering the safety of the operators, the threshold of the width of the bamboo strips is 300mm.

The beneficial effects of the above-mentioned technical solution of the utility model are as follows:

In the above scheme, the utility model adopts the flexible anode made of bamboo composite material for the shortcomings of the anode of the current wet dust collector, which solves the problems that the current flexible anode is easy to be broken down, the effect of dust accumulation is not good, and it is easy to harden. The new type is cheap, light in weight, easy to install, not easy to corrode, and can be recycled.

Description of drawings

Fig. 1 is a structural schematic diagram of the anode of the wet electrostatic precipitator of the present invention.

Among them: 1-anode unit.

detailed description

In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, the following will describe in detail with reference to the drawings and specific embodiments.

The utility model provides an anode for a wet electrostatic precipitator aiming at the problems that the anode of the existing wet electrostatic precipitator is heavy, easy to corrode, high in price, easy to be broken down, easy to stick to walls and the like.

As shown in Fig. 1, it is a structural schematic diagram of the anode of the wet electrostatic precipitator of the present invention. The wet electrostatic precipitator anode is composed of more than one anode unit 1, the anode unit 1 is a hexagonal honeycomb structure, the six sides are 165-degree arcs, and two adjacent arcs form a 120-degree angle. After computer simulation and repeated tests, it is found that: when the six surfaces have radians and keep them at 165 degrees, the distribution of the electric field is the most uniform and the electric field is 1.5 times stronger than that without radians when the voltage is constant, thus greatly improving the dust removal effect. The flow field test also shows that when the temperature is maintained at 165 degrees, the pressure loss of the flue gas is also the smallest, which effectively reduces the energy consumption of the system. And through computer simulation and repeated tests, it is found that the angle with a radian of 120 degrees, the resistance of the flue gas here will be smaller, and it is not easy to form a dead corner of dust accumulation here, and it is easy to wash, thereby improving the dust removal efficiency.

The front and back of the anode bamboo strips of the wet electrostatic precipitator are evenly coated with a layer of graphene. The resistivity of graphene is the lowest among known conductive substances, and the electron migration speed is also the fastest. After repeated tests, it is found that The electric field of bamboo strips coated with single-layer graphene is 5 times stronger than that of other conductive materials such as graphite, which greatly reduces the discharge voltage, and the energy consumption reduction effect is very obvious.

The anode of the wet electrostatic precipitator is an equilateral body formed by splicing six 165-degree circular arc plates into an anode unit 1, and a plurality of anode units 1 are combined into a honeycomb shape, and the six inner angles of the honeycomb are all 120 degrees. The cathode line with thorns is placed in the center of the honeycomb anode. The thorns on the cathode line echo the arc part of the anode plate, which increases the discharge intensity, and the graphene on the surface has more influence on the electric field intensity. Very large, due to the increase of the electric field strength, the distance between the cathode and anode can be increased by 5 times compared with the distance between the cathode and anode of the traditional honeycomb anode dust collector, thus greatly improving the dust removal effect. After the gas is ionized in the wet electrostatic precipitator, most of the dust particles in the flue gas are deposited on the bamboo composite anode. When the dust on the anode plate accumulates to a certain thickness, the effect of dust accumulation will decrease. At this time, the flushing process will be started. During the flushing process of the traditional wet electrostatic precipitator, due to the blind area of flushing, it is easy to cause dead ends. After a long time of operation, a large amount of dirt It will greatly affect the dust removal effect. The included angles between the anode plates of the utility model are arc angles, and dust and dirt are not easy to accumulate. The anode of the wet electrostatic precipitator of the utility model is made of bamboo composite material, which has strong corrosion resistance and light weight, so the overall weight of the anode is relatively light, which not only reduces the load bearing of the anode bracket, but also the bamboo composite material can be reused, saving costs . After wet desulfurization, the wet and dusty flue gas flows in the channel between the anodes of the dust collector. Due to the high pressure in the channel, gas ionization will occur and a large number of free electrons, positive and negative ions will be generated. The dust particles in the flue gas will flow in the channel electric field These electrons and positive and negative ions collide with each other to be charged, and then the charged dust particles move to the opposite electrode under the action of the electric field, so that the dust particles in the flue gas are separated from the gas, and the purpose of purifying the gas is achieved. The anode of the utility model is easy to install, and once a certain anode plate is damaged, it is easy to replace. Moreover, due to the natural curvature, the anode plate of the utility model has a large specific surface area and high strength. Under the premise of ensuring the dust removal effect, the corrosion resistance and flue gas impact resistance of the anode of the utility model wet dust collector are better than the traditional ones. Dust collector anode.

In the specific implementation process, take seven anode units 1 as an example to form the anode of the wet electrostatic precipitator. The thickness of the bamboo composite material is 1 mm, the length is 5 m, and the width is 150 mm. The radian of each bamboo strip is 165 degrees. The included angle is 120 degrees, and the upper and lower surfaces of the bamboo strips are coated with single-layer graphene. The cathode line is located in the center of each anode unit from top to bottom, with a length of 5m. The voltage selected in this embodiment is 35,000 volts, the inlet flue gas reaches saturated humidity, the dust content is 70 mg/Nm ³ , and the temperature is 60°C. The flow rate of the flue gas in the direction of the anode plate in the anode channel is 150mm/s, so the dust-laden flue gas completes the adsorption of dust particles on the electrode plate after 3.5s, and the clean flue gas is discharged from the bottom of the dust collector. The dust content of the gas is 3mg/Nm ³ , and after 24 hours, the dust content of the flue gas will reach 30mg/Nm ³ . Start the flushing device and flush for 10 minutes. During the flushing process, the voltage drops to 15,000 volts. When the inlet flue gas condition remains unchanged, the dust content of the outlet flue gas can reach 35mg/Nm ³ during the flushing process.

It can be seen from the above examples that the utility model wet dust collector has high dust removal efficiency, low energy consumption, is not easy to corrode, and has low cost. While meeting the dust removal rate, it can reduce the load bearing burden of the dust collector support to the greatest extent.

The above is a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. And retouching should also be regarded as the protection scope of the present utility model.

Claims (4)

1. A wet-type electrostatic precipitator anode, characterized in that: it is composed of more than one anode unit (1), the anode unit (1) is a hexagonal honeycomb structure, and the six sides are 165-degree arcs, two adjacent sections The arc forms an angle of 120 degrees. 2. The anode of a wet electrostatic precipitator according to claim 1, characterized in that: the anode unit (1) is made of a bamboo composite material made of bamboo strips coated with graphene on the surface. 3. A wet electrostatic precipitator anode according to claim 1 or 2, characterized in that: the bamboo strips forming the anode unit (1) have a thickness of 0.5-2.5mm, a length of 2-10m, and a width of 100mm. -300mm; Graphene is coated on the upper and lower surfaces of the bamboo strips, and it is a single-layer coating. 4. The anode of a wet electrostatic precipitator according to claim 1 or 2, characterized in that: the bamboo strips of the anode unit (1) are in the shape of a curved sheet.