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Apparatus and method for comprehensive utilization of thermal energy in chlorine dioxide pulp bleaching

A chlorine dioxide, pulp bleaching technology, applied in pulp bleaching and other directions, can solve problems such as more consumption, achieve the effects of energy saving and environmental protection costs, reducing steam consumption, and reducing costs

Active Publication Date: 2018-01-19
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem in the traditional chlorine dioxide pulp bleaching process is that the temperature of the chlorine dioxide aqueous solution sent to the bleaching section is about 10-15°C, and the low-temperature chlorine dioxide aqueous solution mixed with the pulp will reduce the temperature of the pulp, and the bleaching temperature needs to be Control at around 70°C. Due to the addition of low-temperature chlorine dioxide aqueous solution, the bleaching section needs to consume more steam to ensure the temperature of the bleached pulp. The chlorine dioxide preparation section needs to make normal temperature process water into low-temperature frozen water

Method used

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  • Apparatus and method for comprehensive utilization of thermal energy in chlorine dioxide pulp bleaching
  • Apparatus and method for comprehensive utilization of thermal energy in chlorine dioxide pulp bleaching
  • Apparatus and method for comprehensive utilization of thermal energy in chlorine dioxide pulp bleaching

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Effect test

Embodiment 1

[0033] Such as figure 1 Shown, a chlorine dioxide pulp bleaching heat energy comprehensive utilization device, including pulp pump (1), steam heater (3), mixer (4), bleaching tower (5), heat exchanger one (8), ice water machine (9), the pulp pump (1) is connected to the inlet of the steam heater (3) through the pulp conveying pipe (11), and the outlet of the steam heater (3) is connected to the inlet of the mixer (4) through the pulp conveying pipe (11), The outlet of the mixer (4) is connected to the inlet of the bleaching tower (5) through the pulp conveying pipe (11), the chlorine dioxide conveying pipe (6) is connected to the inlet of the heat exchanger one (8), and passes through the outlet of the heat exchanger one (8) It is connected with the mixer (4), and the process water delivery pipe (7) is connected to the inlet of heat exchanger one (8), and connected to the chiller (9) through the outlet of heat exchanger one (8).

[0034] A method for comprehensive utilization...

Embodiment 2

[0040] Such as figure 1 Shown, a kind of chlorine dioxide pulp bleaching heat energy comprehensive utilization device, on the basis of embodiment 1, steam heater (3) inlet is connected with steam adding pipe (2), ice water machine (9) outlet is connected with ice water delivery Tube (10).

[0041] A method for comprehensive utilization of chlorine dioxide pulp bleaching heat energy using the above-mentioned device, the specific steps are as follows:

[0042] Step 1, pulp conveying, the pulp in the pulp conveying pipe (11) is pumped to the steam heater (3) through the pulp pump (1), and the steam is added into the steam heater (3) through the steam adding pipe (2) to process the pulp Transport to mixer (4) after heating;

[0043] Step 2, heat exchange, process water at 30°C normal temperature enters heat exchanger one (8) through process water delivery pipe (7), 13°C low-temperature chlorine dioxide aqueous solution enters heat exchanger one through chlorine dioxide delivery ...

Embodiment 3

[0047] Such as figure 1 Shown, a kind of chlorine dioxide pulp bleaching heat energy comprehensive utilization device, on the basis of embodiment 1, steam heater (3) inlet is connected with steam adding pipe (2), ice water machine (9) outlet is connected with ice water delivery Tube (10).

[0048] A method for comprehensive utilization of chlorine dioxide pulp bleaching heat energy using the above-mentioned device, the specific steps are as follows:

[0049] Step 1, pulp conveying, the pulp in the pulp conveying pipe (11) is pumped to the steam heater (3) through the pulp pump (1), and the steam is added into the steam heater (3) through the steam adding pipe (2) to process the pulp Transport to mixer (4) after heating;

[0050] Step 2, heat exchange, 28 ℃ normal temperature process water enters heat exchanger 1 (8) through process water delivery pipe (7), 15 ℃ low-temperature chlorine dioxide aqueous solution enters heat exchanger 1 through chlorine dioxide delivery pipe (6...

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Abstract

The invention discloses an apparatus and a method for comprehensive utilization of thermal energy in chlorine dioxide pulp bleaching. Heat exchange is carried out between normal temperature process water, which is used for producing ice water, and a low-temperature chlorine dioxide water solution, which is about to be added to pulp, so that after the heat exchange, temperature of the chlorine dioxide water solution is increased; then the chlorine dioxide water solution is mixed with the pulp, so that usage amount of steam for heating the pulp is reduced; furthermore, after the temperature of the process water is reduced after the heat exchange, the process water is sent to an ice water machine to produce ice water, so that the refrigerating load is reduced since the water inlet temperatureis reduced, thus saving energy.

Description

technical field [0001] The invention belongs to the field of chlorine dioxide pulp bleaching, and in particular relates to a device and method for comprehensive utilization of chlorine dioxide pulp bleaching heat energy. Background technique [0002] Chlorine dioxide has a strong oxidizing ability, high bleaching efficiency, can selectively remove lignin and pigment, no or little damage to fibers, high yield of bleached pulp, high mechanical strength, high whiteness and good stability . It can also effectively reduce the viscosity of papermaking white water, and reduce the acidity, chroma and sodium chloride content of bleaching wastewater. BOD in bleaching wastewater 5 , Low CODcr load, greatly reducing toxic and carcinogenic organic halides (AOX), reducing waste water treatment costs, and reducing water consumption for papermaking. In view of the above advantages, chlorine dioxide pulp bleaching technology has been widely used in the pulp and paper industry. [0003] F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/14
Inventor 王双飞詹磊徐萃声黄丙贵班飞刘良青谭浪
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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