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Comparison between electric tar precipitator and mechanical tar remover for separating tar droplets in HVDC power plant

  • Publisher: Yan Wenhua

    Release date: September 16, 2020
  • Separation of tar droplets in HVDC power plant Electric tar precipitator Compared with mechanical tar remover

    Electric tar precipitator It refers to the coke oven gas primary cooling equipment which uses high voltage DC electric field to separate tar droplets and gas.

    Compared with mechanical tar remover, electric tar precipitator has the characteristics of tar removal, low resistance loss and large gas treatment capacity. It can not only meet the requirements of gas quality in the subsequent process, improve the product recovery rate, but also significantly improve the operating environment.

    There are three types of structure of electric tar precipitator, including concentric circle type, tubular type and honeycomb type. No matter which structure, its working principle is to apply high-voltage direct current between the metal wire and the metal tube wall to maintain an electric field sufficient to ionize the gas and form a corona region.

    Working mechanism

    Gas discharge process: under normal circumstances, the gas is not conductive, but under the action of high-voltage electric field, the electrons inside the gas will get enough energy to become electrons and conduct electricity, which is called spontaneous ionization phenomenon. Spontaneous ionization of gas is based on inhomogeneous electric field. In the uniform electric field, with the increase of voltage, as long as any point between the ionization occurs, the charged ions will be filled immediately, and the gas in the whole space will be broken down. At this time, the current increases sharply and forms spark discharge. In the inhomogeneous electric field, the electric field intensity decreases with the set distance.

    Choice in industry

    In addition, the corona discharge voltage can be much higher than that of corona discharge under the same conditions.

    Comparison between electric tar precipitator and mechanical tar remover for separating tar droplets in HVDC power plant

    The main factors affecting the performance of electric capture are as follows

    Due to the influence Electric tar precipitator There are many factors affecting the operation performance. Please inform the density, viscosity, specific resistance, gas temperature, pressure, humidity, flow rate and impurity concentration of dust and droplets when selecting the model.

    Electric tar precipitator is used in the gas station. When the gas containing tar and solid particles enters the electric tar remover evenly through the gas separator, the DC voltage in the high-voltage electric field is high 40-60KV Under the action of the negative corona, the gas around the corona is ionized and a large number of electrons and positive ions are generated - In the process of gas flow, tar is attracted by electrons and positively charged ions to form electronic tar particles and positively charged tar particles. Under the action of high voltage electric field, these charged particles move towards them relatively, that is, the negatively charged tar particles move to the precipitation, and the positively charged tar particles move to corona Other tar particles are absorbed to form larger particles. The precipitate is absorbed and adheres to the pipe wall. The tar is removed by its own weight.

    The main task of this section is to transport and condense gas ; Separation, storage and transportation of tar and tar residue ; Removal of tar droplets and naphthalene from gas. Selection of indirect horizontal tube primary cooler for gas ; Centrifugal gas pressure blower is selected ; The removal of tar mist and naphthalene in coal gas is selected by honeycomb type electric tar precipitator.

    Process flow: the raw gas from the coke oven is separated by gas-liquid separator, and the separated raw gas enters the primary cooler in parallel. The separated tar and tar residue enter the mechanized clarifier for separation.

    The upper and lower sections of the primary and lower water coolers are divided into two sections 82℃ reach 45℃ Circulating water from 32℃ Rise to 40℃ Then, the gas enters the lower section of the primary cooler to exchange heat with the cooling water in the pipe 45℃ reach 22℃ Cooling water from 16℃ Rise to 23℃ After the gas parallel into the honeycomb electric tar precipitator, to remove the tar droplets and naphthalene in the gas, after the electric capture of the gas into the centrifugal blower for pressure. The pressurized gas is sent to the desulfurization section.

    The gas condensate separation of the primary cooler flows out from the upper and lower sections of the primary cooler. After passing through the water seal tank of the primary cooler, the separation enters the condensate circulating tank of the upper and lower sections. The separation is pressurized by the upper and lower condensate circulating pumps and sent to the upper and lower sections of the primary cooler for spraying. In this way, the remaining part is pumped to the mechanized clarifier by the lower condensate circulating pump.

    Comparison between electric tar precipitator and mechanical tar remover for separating tar droplets in HVDC power plant

    The tar and tar residue separated from the gas-liquid separator flow to the mechanized clarifier. After clarification, it is separated into three layers, the upper layer is tar, the middle layer is tar, and the base layer is tar residue. The separated overflow flows to the circulating tank, and then the coke oven raw gas is pumped by circulating pump. When the primary cooler and electric tar precipitator need to be cleaned, a part of it should be drawn out from the back of the circulating pump and cleaned regularly. The remaining ammonia will be pumped to the separation tank after the rest of desulfurization is pumped. When the gas collecting pipe is blocked, a part of the gas collecting pipe is flushed by high-pressure pump. The separated tar is sent to the tar tank by tar pump regularly. The separated tar slag is sent to the coal yard for blending and coking. Through honeycomb Electric tar precipitator The collected tar is discharged into the electric water trap sealing tank. When the sedimentation pipe is scoured by circulation, the flushing liquid also enters the electric water catching sealing tank , It is pumped to the mechanized clarifier by the electric water catching sealing tank .

    Hebei Shouyang environmental protection equipment Co., Ltd. has been committed to the research, development, installation and production of environmental protection dust removal, waste gas, desulfurization and denitration engineering equipment for many years, mainly including boiler dust collector, bag filter, filter drum dust collector, cyclone dust collector, wet electrostatic precipitator, electrostatic precipitator and waste gas odor purifier. At the same time, our company produces dust collector bag and dust collector framework With the cooperation of high-tech engineers and excellent production and installation team, the company has been highly praised by the industry and customers

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