CN201632329U - Rare earth tungsten thermionic emission type high temperature electrostatic precipitator - Google Patents

Abstract

The utility model discloses a rare-earth tungsten thermoelectron emission type high-temperature electrostatic precipitator, which comprises a dust collector shell, a rare-earth tungsten emitting cathode rod and a rare-earth tungsten dust-collecting cathode rod; , a dust collection area and an exhaust section; the air intake section is provided with an air inlet, and the air outlet section is provided with an air outlet; the rare earth tungsten emission cathode rod is suspended in the charging area, and the rare earth tungsten is suspended in the dust collection area. Dust collecting cathode rod; the lower part of the charging area and the dust collecting area are equipped with dust collecting funnels. On the one hand, the utility model effectively utilizes the waste heat of flue gas and saves energy; on the other hand, because of its high emission current density, the efficiency of capturing dust particles, especially fine particles, is greatly improved. In addition, its operating voltage is low, and the problem of high-temperature electrical insulation is easy to solve, which improves the stability and reliability of equipment operation. The waste heat of the flue gas is effectively utilized to save energy. Since the rare earth tungsten material has good high temperature resistance, the working temperature can reach 1200°C.

Description

Rare earth tungsten thermionic emission type high temperature electrostatic precipitator

technical field

The utility model relates to a coal-fired flue gas dedusting device, in particular to a rare-earth tungsten thermionic emission type high-temperature electrostatic precipitator.

Background technique

In terms of high-efficiency and clean combustion technology of coal, the popular method in the existing technology is to use advanced coal-fired combined cycle power generation technology, such as: integrated gasification combined cycle (IGCC) power generation technology, pressurized fluidized bed combustion (PFBC) combined Cycling power generation technology, etc., in these technologies, high-temperature raw gas (flue gas) must be dedusted and purified before entering the gas turbine to meet its blade protection standards before it can be used. It is not only the prerequisite for the safe and reliable operation of the gas turbine and the extension of its service life, but also greatly reduces the pollutants discharged, which has important environmental protection significance. The higher the flue gas temperature entering the gas turbine, the higher the thermal and overall efficiency of the system. Therefore, developed countries such as Europe and the United States regard high-temperature gas (flue gas) purification technology as one of the key technologies for the commercialization and technological upgrading of coal-fired combined cycle power generation. As a main content of high-temperature purification technology, high-temperature dedusting technology is not only the key to the development of current IGCC and PFBC, but also particularly important for the development of more advanced coal-fired combined cycle power generation technology. In addition, in the chemical industry, some drying systems use high-temperature flue gas at about 1100°C as the medium to directly dry materials. The high-temperature flue gas containing impurities must be purified before it can be put into use.

So far, the existing high-temperature dust removal technologies mainly include: electrostatic dust removal, cyclone dust removal, ceramic filter dust removal, metal felt filter dust removal and moving particle layer filter dust removal. Electrostatic dust removal technology has the advantages of low pressure drop loss, no clogging, large amount of flue gas treatment, and high dust removal efficiency, especially for fine particles. Traditional electrostatic precipitators are all corona electrostatic precipitators based on high-voltage corona discharge, which are suitable for working in medium and low temperature environments below 450°C. At high temperature, the voltage range of its corona operation is reduced, and the corona phenomenon is difficult to maintain; because of its high operating voltage (up to 50-100KV), it is difficult to solve the electrical insulation problem at high temperature.

Utility model content

The technical problem to be solved by the utility model is to overcome the defects of the prior art, and propose a rare-earth tungsten thermionic emission type high-temperature electrostatic precipitator. The thermal electron emission cathode is made of rare earth tungsten composite functional materials, and the temperature of the cathode is increased by using the heat of the high-temperature flue gas itself or other heating methods to emit electrons, charge the dust particles, and then remove them from the flue gas through the action of the electric field force separated and captured.

The utility model of a rare earth tungsten thermionic emission type high temperature electrostatic precipitator comprises a dust collector shell, a rare earth tungsten emission cathode rod and a rare earth tungsten dust collection cathode rod; It is composed of an exhaust section; the air inlet section is provided with an air inlet, and the air outlet section is provided with an air outlet; the rare earth tungsten emission cathode rod is suspended in the charging area, and the rare earth tungsten dust collection cathode rod is suspended in the dust collection area ; The lower part of the charging area and the dust collecting area are equipped with dust collecting funnels.

Suspending the rare earth tungsten emission cathode rod in the charging area and the rare earth tungsten dust collection cathode rod in the dust collection area are: the rare earth tungsten emission cathode rod and the rare earth tungsten dust collection cathode rod use stainless steel suspension rods respectively Suspended in the center of the charging area and the dust collection area, they are all arranged along the axial direction of the dust collector shell.

In order to solve the problem of high-temperature electrical insulation, the rusty steel suspenders are fitted with corundum porcelain sleeves to insulate from the dust collector shell.

Its working process is:

The maximum working temperature in the charged area is 1200°C; in the charged area, the rare earth tungsten emitting cathode rod emits thermal electrons uniformly to the surroundings. In order to ensure the stable emission of thermal electrons in a large temperature range, the emitter is connected to the cathode of the power supply, and the charging voltage is controlled between 0-3000V; in the dust collection area, the rare earth tungsten dust collection cathode rod is connected to the cathode of the power supply, and the dust collection voltage Control at 6000-20000V; the outer wall of the dust collector shell is grounded, which serves as the anode of the charging area and the dust collecting area.

After the rare earth tungsten emission cathode is heated, a large number of electrons are emitted, and under the action of the electric field force, the cathode moves directionally to the inner wall of the dust collector shell. The high-temperature dust-laden flue gas flow enters the charging area axially from the air inlet, and the dust in the flue gas captures negative ions or free electrons to charge. After entering the dust collection area, the charged particles move into the dust collector shell under the action of the electric field force The dust particles reaching the inner wall fall into the mouth of the dust collecting funnel under the action of gravity.

The utility model adopts the rare earth tungsten composite functional material to make the thermal electron emission cathode, and uses the heat of the high-temperature flue gas itself or other heating methods to increase the temperature of the cathode to emit electrons, charge the dust particles, and then discharge them through the action of the electric field force. Separated from flue gas and captured. On the one hand, it effectively utilizes the waste heat of the flue gas to save energy; on the other hand, because of its high emission current density (more than 2 orders of magnitude higher than that of the corona electrostatic precipitator), the capture efficiency of dust particles, especially fine particles, is greatly improved. . In addition, its operating voltage is low, and the problem of high-temperature electrical insulation is easy to solve, which improves the stability and reliability of equipment operation. The waste heat of the flue gas is effectively utilized to save energy. Due to the good high temperature resistance of rare earth tungsten materials, the working temperature of rare earth tungsten thermionic emission high-temperature electrostatic precipitators can reach 1200 °C.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a rare earth tungsten thermionic emission type high-temperature electrostatic precipitator of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the utility model is described in detail.

Example

As shown in Figure 1, the rare earth tungsten thermionic emission type high-temperature electrostatic precipitator includes a dust collector housing, a rare earth tungsten emitting cathode rod 1 and a rare earth tungsten dust collecting cathode rod 2; Electric zone 4, dust collection zone 5 and exhaust section 6; the air inlet section is provided with an air inlet 7, and the air outlet section is provided with an air outlet 8; the rare earth tungsten emitting cathode rod is suspended in the center of the charging area by a stainless steel suspender , set along the axial direction of the dust collector housing. In order to solve the problem of high temperature electrical insulation, the stainless steel suspenders are equipped with corundum porcelain sleeves, which are insulated from the dust collector shell. The rare earth tungsten dust collection cathode rod is suspended in the center of the dust collection area with a stainless steel suspension rod, and is arranged along the axial direction of the dust collector shell. In order to solve the problem of high-temperature electrical insulation, the stainless steel suspenders are all equipped with corundum porcelain sleeves to insulate from the dust collector shell. The charging area is provided with a dust-collecting funnel mouth 9, and the lower part of the dust-collecting area is provided with several dust-collecting funnel mouths 9.

Claims (3)

1. rare earth tungsten thermal electron emission type high temperature electrostatic deduster comprises deduster housing, rare earth tungsten emitting cathode bar and the rare earth tungsten cathode rod that gathers dust; It is characterized in that: the deduster housing is made of air inlet section, charging area, dust collection section and exhaust section successively; The air inlet section is provided with air inlet, and the section of giving vent to anger is provided with the gas outlet; The described rare earth tungsten emitting cathode bar of suspention in the charging area, the described rare earth tungsten of the suspention cathode rod that gathers dust in the dust collection section; The bottom of charging area and dust collection section is equipped with the grey bell mouth of collection.

2. according to the described rare earth tungsten of claim 1 thermal electron emission type high temperature electrostatic deduster, it is characterized in that: the described rare earth tungsten of the suspention cathode rod that gathers dust in described rare earth tungsten emitting cathode bar of suspention and the dust collection section in the described charging area, be: rare earth tungsten emitting cathode bar or the rare earth tungsten cathode rod that gathers dust is suspended in the center of charging area and dust collection section respectively with the stainless steel suspension rod, all along the deduster housing shaft to setting.

3. according to the described rare earth tungsten of claim 1 thermal electron emission type high temperature electrostatic deduster, it is characterized in that: described stainless steel suspension rod suit corundum porcelain sleeve pipe, insulate with the deduster housing.

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