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Feeding system comprising parallel pumps for a continuous digester

一种连续蒸煮器、供给系统的技术，应用在蒸煮器、连续制浆工艺、用碱性化合物预处理等方向，能够解决增大泵送能量、高压星形给料器易受磨损、不节能等问题，达到提高效率、安装成本降低、降低运转成本的效果

Inactive Publication Date: 2011-04-13
METABO PAPER SWEDEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this system proved to have some disadvantages: the high-pressure star feeder was subject to wear and had to be adjusted to minimize leakage from the high-pressure recirculation flow to the low-pressure recirculation
Another disadvantage is that the conveying process must be kept cold so that the conveying does not generate the explosion sound associated with steam implosion
However, this method is not energy efficient as it forces the feed system to pump unnecessarily large volumes of liquid, thereby increasing the pumping energy required to produce a unit of pulp

Method used

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  • Feeding system comprising parallel pumps for a continuous digester
  • Feeding system comprising parallel pumps for a continuous digester
  • Feeding system comprising parallel pumps for a continuous digester

Examples

Experimental program
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no. 1 example

[0055] figure 1 An embodiment of a supply system with at least two pumps connected in parallel is shown. Chips are fed by a conveyor belt 1 to a chip buffer 2 provided on top of an atmospheric pressure processing vessel 3 . In this container, the minimum liquid level LIQ is formed by adding alkaline immersion liquid LEV , the alkaline steeping liquor is preferably the cooking liquor (black liquor) extracted from the filter screen SC2 of the subsequent digester 6 and can be formed by adding white liquor and / or another alkaline filtrate to form a minimum liquor Noodle LIQ LEV .

[0056] by height of wood chips CH LEV The normal control to supply wood chips, the formed wood chip height CH LEV LIQ at the liquid level LEV above.

[0057] The residual alkali content in the black liquor is usually between 8-20g / l.

[0058] The amount of black liquor and other alkaline liquids added to the treatment vessel 3 is regulated by a level sensor 20 which controls at least one flow va...

no. 2 example

[0071] Figure 8 An alternative embodiment of a feed system for a continuous digester without an overhead separator is shown, wherein each pump 12a, 12b pumps the chip suspension to the top of the digester via a first section 13a, 13b of the transfer line; and The first sections of the transfer line from the at least two pumps merge at a confluence point 16 such that the second section 13ab of the transfer line forms a combined second section 13ab before leading to the top of the digester. In order to maintain a constant flow, a supply line 15 is also connected to a junction 16 . In this embodiment, black liquor is withdrawn from line 41 and pump 14 may be used to pressurize the black liquor. However, since the black liquor has reached full digester pressure, there is limited need for pressurization of the liquor.

[0072] All other features of the system are part of the figure 1 corresponding to the system shown in .

[0073] Figure 9 It is shown how the supply lines 15...

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Abstract

The invention relates to a feed system for a continuous digester where at least 2 pumps are arranged in parallel in the bottom of a pre-treatment vessel and where the transfer to the top of the digester takes place without a conventional top separator. The invention makes it possible to provide a feed system with an improved accessibility and operational reliability and being able to operate the main part of the pumps at optimal efficiency even if the production capacity is reduced.

Description

technical field [0001] The invention relates to a feed system according to the preamble of claim 1 for a continuous digester in which wood chips are cooked to produce cellulose pulp. Background technique [0002] In the old traditional feed systems of continuous digesters, high pressure star feeders have been used as sluice feeders to pressurize and deliver the chip slurry to the top of the digester. [0003] Pulp Handbook (Herbert Sixta, 2006) discloses on page 381 this feeding using a high pressure star feeder (high pressure feeder). The main advantage of this supply is that the flow of chips does not need to go through a pump, but is instead conveyed hydraulically. At the same time, high pressure can be maintained without loss of pressure in the transfer cycle into and out of the digester. However, this system proved to have some disadvantages: the high pressure star feeder was subject to wear and had to be adjusted to minimize leakage from the high pressure circulation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C7/06D21C3/24
CPCD21C7/06D21C1/06D21C3/24
Inventor 安德斯·萨缪尔森乔纳斯·赛特艾森丹尼尔·托林
Owner METABO PAPER SWEDEN