Cone-Wallet Drum Vacuum Washing Machine Huo Junjun, Liu Bingzhen, Xu Dongming, Zhang Qi (Anqiu Wenrui Machinery Manufacturing Co., Ltd., Anqiu 262100, Shandong, China) Application and effect.

The cone valve washing machine uses vacuum as the filter power, adopts the conical distribution valve, has a compact structure, and is easy to cooperate with the seal to ensure the degree of vacuum and avoid the string gas. The drum body of the cone valve drum vacuum washer is divided into a number of mutually uncommunicable cells by grid bars, and the cells are connected to the cone valve body evenly distributed around the filter tube through the filter tube. With the rotation of the drum, the cells in turn connect the vacuum zone of the distribution valve spool (divided into the filter zone and the washing zone) and the stripping zone. When the cell is turned to the vacuum filtration zone, the vacuum system sucks. A slurry layer acts on the surface of the mesh; when it is transferred to the vacuum washing section, the waste liquid in the original slurry layer is replaced by the washing liquid after being sprayed with the four-stage washing liquid; finally, the liquid is removed from the pulp section and the blowing system is switched on. , destroy the chamber vacuum, hold the slurry layer, peel the slurry into the discharge chute. The entire washing, concentration and black liquor extraction process of the slurry was completed.

1 Equipment Structure A single pulp washing machine is mainly composed of a drum, a tank body, a distribution valve, a washing device, a stripping device, a transmission device and a screw conveyor. The tandem washer also has a ramming device and a stirring device, and the agitating tank is diluted in the middle. The washer has only one dispensing valve and the filtrate is discharged at one end. The discharge filtrate end is the operating side and the other end is the transmission side.

1.1 Distributing valve Dispensing valve is a very important part of the drum vacuum washer. It is mainly composed of valve core, valve seat and end cap. The valve plug has a 10* cone shape, and it cooperates with the valve of the drum body to form a complete dispensing valve structure. The mating surface of the valve core and valve requires a running clearance of 0.5~0.8mrn and no friction with each other. The valve rotates with the drum, and the valve plug and valve seat are fixed. When each rotation of the drum, the cells on the drum body are respectively connected with the partition of the valve core, and the pulp washing machine successively completes the vacuum filtration, the vacuum washing, and the gas stripping and the like. Distributing valve is vacuum vacuum washer device, there are two ways to generate vacuum: First, the washing machine is installed in the position of the standard 12*, by the black liquid in the water leg when the difference in natural Vacuum; Second, forced vacuum, including the installation of a vacuum pump, receiver, high condenser and collector and a full set of equipment. You can also use both methods at the same time. The general vacuum degree 0. 01 ~ 0.025MP /. Distribution valve structure shown in Figure.

1.2 The function of the tumbler is to filter and wash the slurry and form it on the drum surface.) In 1993, he graduated from the Department of Mechanical and Electrical Engineering of the Heilongjiang Mining Institute and the engineer of mine machinery. He is mainly engaged in the design of papermaking machinery. Tel: 0536 Slurry One end of the drum body is supported by a plain bearing and the other end is supported by a rolling bearing. The drum body is a circular cylinder body and mainly consists of left and right drums, a middle cylinder body and a shaft head. The drum surface is divided into several compartments by grid bars. Each cell has a long circular hole corresponding to the valve body. Connected. When the drum rotates, the filtrate in the compartment passes through each section of the spool one after another, allowing the drum to complete the process of filtration, washing and stripping of the slurry. The filter plate is a new type of stainless steel corrugated filter plate. Its role is to support the filter screen. The assembly form is press-embedded. It has superior anti-filtrate infiltration and increases the effective filtration area.

1.3 The tank body is used to receive slurry and welded with steel plates.

A single washing machine tank is generally used for pulp rinsing or concentrating. It is used to bleach the chlorination section. The medium is acidic (pH: 1.8-2.2), alkaline, and the tank is divided into two types: lining glass steel (or stainless steel) and carbon steel. .

The tank body is composed of three parts: the slurry tank, the drum groove, and the discharge tank. There are two symmetrically arranged slurry inlets below the slurry tank, with a slurry screen on top to buffer the slurry. There are two sewage outlets under the drum tank, and a D/100 port is provided at the tank 30. It is used to control the liquid level. Use, there is a discharge square hole in the middle of the discharge chute, when using the machine outside the pulp, do not open this hole.

Multiple tandem washers are mainly used for the washing of pulp after cooking, such as kraft or alkaline pulping, generally made of carbon steel. There are also intermediate slots between each two tandem washers. The slurry was peeled off from the previous pulp washer at a concentration of 80 to 12%. Here, the black liquor from the lower pump was used to dilute it to a concentration of about 10, which was fully mixed and stirred, resulting in good diffusion conditions. Drum vacuum pumping machine is superior to other processes in the extraction of black liquor, and it is one of the reasons for heavy equipment that has a relatively high extraction rate. There is a sandwich at the bottom of the middle tank. There are two diluent inlets at the bottom of the sandwich. The diluent overflows from a row of rectangular holes at the top of the sandwich. The middle of the tank is separated by steel plates, and the slurry can only pass under the partition. The middle tank has a pressure roller, which rotates in the direction of 51r/rnin counter-wash drum flow, breaks the pulp block stripped from the pulper, and then a stirring roll that turns at 88r/min counterflow. The slurry is crushed into a slurry of uniform concentration to promote black liquor dispersion. The slurry then flows through the lower part of the pulp-retaining plate, overflows the weir plate and enters the drum groove, and is then sucked onto the washing drum of the lower-stage washing machine. This avoids Pulp slurries or internet access are difficult. There are also 2 filling slots below the middle slot. The slurry is used as a cleaning port.

1.4 Washing Device The washing device is to make the slurry layer replace washing. Mainly by the wash pipe, nozzles, distribution pipes, valves and other components. A total of four wash pipes are staggered in the washing zone of the drum, with a distance of 15... to ensure uniform washing of the pulp layer. The water pressure and flow of the wash tube can be adjusted by the respective valves.

1.5 Peeling device The machine uses an air scraper to strip the pulp. It is mainly composed of a fan, an air inlet pipe, a scraper body, a blade and a seal, and is installed in the stripping zone of the drum. The blade and drumhead maintain a spacing of about 6rnrn. Its working principle: the low-pressure air blown out by the fan enters the scraper body cavity from the air inlet pipe, and is discharged from the cavity discharge port, and enters a pressure zone composed of a pulp surface, a blade body surface, a drum surface, etc., and part of the air enters the distribution through the drum surface. The stripping zone of the valve causes the drum vacuum to be destroyed and an air cushion is formed on the pulp surface. A part of the valve is forced to eject from the gap between the blade and the drumhead to lift the slurry layer, peeled by the blade, and then discharged into the slurry slot. .

Transmission The transmission consists of an electric motor and a suspended gear reducer.

The shaft head of the drum directly extends into the reducer gear shaft sleeve, and is connected with a key so that one end of the reducer is suspended on the tumbler shaft and the other end is supported by a vertical column.

The hood machine is made of fiberglass. Take slicing and processing. When the installation is connected with a bolt, the outside of the machine has an exhaust port for users to connect the exhaust pipe. Each washer has one machine.

2 The actual application effects were used by Chenming, Sun and Linqing Paper. The results are shown in the table below.

Cone-Valve Drum Washer Field Operation Condition Technical Index Shandong Shouguang Chenming Shandong Sun Paper Shandong Linqing Paper Pulp Concentration (%) Pulp Concentration (*) Residual Alkali Capacity (f/L) Production Capacity (t/ d) Black liquor concentration () The cone valve drum vacuum washer can be used in a single unit or multiple units in series. Its structure is reasonable, the performance is superior, the production capacity is large, the black liquor extraction rate is high, the pulp washing quality is uniform, and the fiber loss is small. Application performance has reached the leading domestic level. Applicable to all kinds of slurry washing, the degree of slurry cleaning, extraction of black liquor concentration, reduce paper industry black liquor pollution. With the increasing demand for resources and environmental protection, the country has far-reaching significance in solving the paper mill wastewater pollution, protecting the natural environment and benefiting future generations. Therefore, the social benefits of the project are very significant, and the application prospect is very broad.

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