Voltage and current stabilizing device for medium consistency pulping feedstock

Abstract

The invention provides a voltage and current stabilizing device for medium consistency pulping feedstock, which is connected with the feeding end of a medium consistency disc grinder. The voltage and current stabilizing device is characterized by comprising a medium consistency pump and a buffer, wherein the medium consistency pump is connected with the buffer; the inlet end of the buffer is connected with the medium consistency pump through a pipeline, the outlet end of the buffer is connected with the medium consistency disc grinder, and the inlet end and the outlet end of the buffer are respectively provided with a pulp feeding regulating valve and a pulp discharging regulating valve which are used for controlling paper pulp flow. The invention effectively regulates the paper pulp pressure between the medium consistency pump and the medium consistency disc grinder and the pulsation of the paper pulp flow so that the delivery of paper pulp inside a pulping system is stable, thereby improving the pulping effect of the medium consistency disc grinder and also greatly prolonging the service life of grinding teeth of a grinding disc.

Description

technical field [0001] The invention relates to papermaking beating technology, in particular to a pressure and flow stabilizing device for feeding medium-consistency beating. Background technique [0002] Medium-consistency beating has been more and more widely used in my country's paper industry in recent years. At present, the beating concentration of medium-consistency disc refiners is generally 6% to 12%. Due to the poor fluidity of pulp under this concentration, the general low The thick pulp pump cannot pump, so there are two ways to solve the medium-consistency beating pulp transportation. In the existing medium-consistency beating process, there are two methods. One is to use the self-priming force of the medium-consistency disc refiner to transfer the The medium-concentrated slurry is sucked into the disc refiner, such as the disc refiner pulping and pressure stabilization method and its device with the application number of 200410052441.2. This device can make the d...

AI Technical Summary

Problems solved by technology

[0002] Medium-consistency beating has been more and more widely used in my country's paper industry in recent years. At present, the beating concentration of medium-consistency disc refiners is generally 6% to 12%. Due to the poor fluidity of pulp under this concentration, the general low The thick pulp pump cannot pump, so there are two ways to solve the medium-consistency beating pulp transportation. In the existing medium-consistency beating process, there are two methods. One is to use the self-priming force of the medium-consistency disc refiner to transfer the The medium-concentrated slurry is sucked into the disc refiner, such as the disc refiner pulping and pressure stabilization method and its device with the application number of 200410052441.2. This device can make the disc refiner work under a relatively stable flow rate and pressure when beating, but the device The slurry in the intermediate transition tower must have a slurry level of more than 5 meters to ensure that the slurry flows to the mouth of the disc refiner. Therefore, the investment in equipment using this method will be large, and the concentration of the slurry generally cannot exceed 8%.

Another method is to use a medium-concentration pump to pump the slurry. This method can solve the problem of slurry supply when the slurry concentration exceeds 8%. However, in the actual application of production, it is found that this slurry supply method has pressure and flow The problem of large fluctuations even causes the disc mill to fail to work normally. This is mainly because it is difficult to achieve stable working conditions in production, and there will be fluctuations. At the same time, the medium-concentration pump amplifies this fluctuation. Improvement, the slurry pumping slurry flow is a kind of pulsating flow, so, using the medium-consistency pump to directly pump the feed will make the pulp feeding pressure and pulp flow rate of the medium-consistency disc refiner vary greatly, and the pulp flow rate The variation reaches ±30%, which increases the load variation of the medium-consistency disc refiner, so the refining process is difficult to control and directly affects the refining effect

This is also the reason why it is difficult to promote the use of medium-consistency beating in a large area when the concentration is greater than 8%.

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