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Replacement cooking pulping method

A replacement cooking and pulping technology, which is used in the regeneration of pulping liquid, pulping of cellulose raw materials, textiles and papermaking, etc., can solve the problems of restricting the number of cooking pots, high investment cost, affecting production, etc. The effect of shortening, less dosage, and environmental protection

Inactive Publication Date: 2011-08-17
白福安
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the hot black liquor tank and the warm black liquor tank are pressure vessels with large volumes, and the investment cost is high; at the same time, when one cooking pot is replaced, other cooking pots cannot occupy the hot black liquor tank and warm black liquor tank, so the production operation It is not easy to stagger, which restricts the number of cooking pots on a production line and affects production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: a kind of displacement cooking pulping method, adopts a cooking pot, comprises the following steps:

[0033] 1. First steam a pot of material with the traditional steaming method, and replace the hot black liquor to the hot black liquor tank before discharging.

[0034] 2. Pot loading: put the raw materials into the cooking pot, and add warm black liquor at the same time;

[0035] 3. Warm charging: close the lid valve, pump the black liquor in the warm black liquor tank from the bottom of the cooking pot, the black liquor will be filtered from the top through the grate in the pot, and then discharged from the top of the pot, and then flow back to the warm black liquor tank for continuous circulation Stop the cycle until the temperature difference between the two sides is 0-10°C.

[0036] 4. Substitution and temperature rise, the hot black liquor from the hot black liquor tank is sent to the bottom of the cooking pot after being exchanged by the first heat...

Embodiment 2

[0044] Embodiment 2: a kind of displacement cooking pulping method, adopts 4 cooking pots, comprises the following steps:

[0045] First cook one or two cooking pots with the traditional cooking method. The cooking time should be staggered to facilitate operation. When the H factor of one of the cooking pots reaches 800-1200. Assuming it is the second cooking pot and there is black liquor in the warm black liquor tank,

[0046] Pot loading: put the raw materials into the first cooking pot, and add warm black liquor at the same time;

[0047] Warm charging: close the lid valve, pump black liquor into the warm black liquor tank from the bottom of the cooking pot, filter it through the grate in the pot from the top, discharge it from the top of the pot and return it to the warm black liquor tank, and continue to circulate until the temperature difference between the two sides is 0-10 °C to stop the cycle. Close the inlet and outlet valves;

[0048]The temperature is raised by ...

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Abstract

The invention discloses a replacement cooking pulping method. The method comprises the following steps of: filling warm black liquid into a pan; filling the warm black liquid; replacing and raising temperature; filling hot white liquid; raising temperature; preserving heat; before emptying materials, replacing heat; and emptying the materials. In the method, the black liquid replaced by a high-temperature-section distilling pan is subjected to heat exchange by a heat exchanger and then is fed into a low-temperature-section distilling pan, the temperature and the pressure of the black liquid are reduced before the black liquid enters the low-temperature-section distilling pan, a water attack phenomenon is avoided, a production process is easy to control, and the production cost is obviously reduced. The heat of the black liquid discharged before the materials are emptied is recovered, so when the materials are emptied, the temperature in the material emptying process is very low, the discharged flash steam is very few, and the method is favorable for protecting environment.

Description

technical field [0001] The invention relates to a cooking pulping method, in particular to a displacement cooking pulping method. Background technique [0002] At present, the cooking processes commonly used in my country's pulp and paper enterprises include steaming ball gap cooking and cooking pot gap cooking. Ball steaming gap cooking has the disadvantages of large floor area, low output, and high energy consumption. With the continuous expansion of papermaking enterprises, the steaming ball gap cooking process can no longer meet the requirements of large-scale and large-scale papermaking enterprises. [0003] The RDH cooking process requires huge investment, complicated operation, and strict safety requirements. The DDS cooking process is an improvement on the RDH process. Compared with the RDH cooking process, it saves energy. These two cooking processes are strictly operated and require very high reliability for the automatic control system and valves. If you don't pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/22D21C11/00
Inventor 白福安
Owner 白福安
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