A method for automatically adjusting the liquid level of the standpipe of medium-consistency slurry pump
An automatic adjustment, thick pulp pump technology, applied in valve details, pump control, pulp bleaching, etc., can solve problems such as inability to pump, large conveying resistance, production obstacles, etc., and achieve the effect of simple and easy technical means and high degree of automation
Active Publication Date: 2017-11-07
佛山市新纸道环保科技有限公司
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Problems solved by technology
However, when the rotational speed decreases to a certain value, due to the characteristics of high air content, high viscosity, and large conveying resistance of the medium-consistency pulp, it is easy to fail to pump, which brings obstacles to production.
Another adjustment method is to adjust the valve opening, that is, to fix the medium-consistency slurry pump speed, adjust the valve opening according to the change of the liquid level to adjust the slurry flow rate to stabilize the medium-consistency standpipe liquid level, but the flow rate change has a relatively large impact on the valve opening. Sensitive, frequent adjustment of the valve opening will easily cause subsequent pressure and flow fluctuations. When the valve opening is too large, it will easily cause steam recoil, slurry recoil and other production failures
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[0022] Such as figure 1 shown. The invention discloses a method for automatically adjusting the liquid level of the standpipe of a medium-consistency pump. The automatic control process of the liquid level of the medium-consistency standpipe 4 is through interlocking the rotation speed of the medium-consistency pump, the opening of the valve 2 behind the pump and the opening and closing of the lower dilution water valve 3. Control the medium-concentration standpipe 4 liquid level; divide the medium-concentration standpipe 4 liquid level into: self-regulating area b-a, high liquid level area a-aa, high and high liquid level area aa-aaa, low liquid level area b -bb, bb-bbb in the low and low liquid level area; it can be realized through the following steps:
[0023] Step 1: When the liquid level is within the self-regulating area, the rotation speed of the medium-consistency pump 1 and the opening of the valve 2 behind the pump remain unchanged from the original input value;
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The invention discloses a medium consistency pump vertical pipe liquid level automatic regulation method.The liquid level of a vertical pipe is controlled by interlinking the rotational speed of a medium consistency pump, the opening degree of a valve behind the pump and a lower dilution water valve switch.The liquid level of the vertical pipe is divided into a self-regulation area, a high liquid level area, a super high liquid level area, a low liquid level area and a super low liquid level area.In the self-regulation area, the input values of the opening degree of the valve and the rotational speed are kept unchanged, and a system conducts self-regulation.In the high liquid level area and the low liquid level area, the system conducts regulation according to the PID rotational speed.In the super high liquid level area and the super low liquid level area, the system conducts regulation through a PID valve.The medium consistency pump vertical pipe liquid level automatic regulation method is high in automation degree, a person is not needed for special nursing, and the medium consistency vertical pipe can be stabilized at the target liquid level.
Description
technical field [0001] The invention relates to the field of pulping and papermaking, in particular to a method for automatically adjusting the liquid level of a standpipe of a medium-consistency pulp pump. Background technique [0002] During the production process of medium-consistency bleaching, due to the unstable flow rate or concentration of incoming pulp, the liquid level of the medium-consistency standpipe often fluctuates, which is unfavorable to the subsequent production process. The existing automatic adjustment methods are mainly divided into two types, one is frequency adjustment, that is, the opening of the valve is fixed, and the frequency of the motor is adjusted according to the change of the liquid level to change the speed of the medium-consistency slurry pump, so as to achieve the purpose of adjusting the flow rate and stabilizing the liquid level of the standpipe . However, when the rotational speed decreases to a certain value, due to the high air cont...
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IPC IPC(8): D21C9/10F04D15/00F16K31/02
CPCD21C9/10F04D15/0066F05D2270/02F05D2270/706F16K31/02
Inventor 李军李智陈克复徐峻莫立焕冯郁成
Owner 佛山市新纸道环保科技有限公司