System for recovering foul and waste heat steam from high-consistency pulping production line for pulping by PRC(preconditioning refining chemical)-APMP(alkaline peroxide mechanical pulp)

Abstract

The invention discloses a system for recovering foul and waste heat steam from high-consistency pulping production line for pulping by PRC(preconditioning refining chemical)-APMP(alkaline peroxide mechanical pulp). The system comprises a pipe for delivering the foul heat steam from high-consistency refining, a washing water tank steam pipe, a pipe for delivering the waste heat steam, a chip bin steam pipe, a reboiling furnace and a steam scrubber, wherein the washing water tank steam pipe is the branch of the pipe for delivering the foul heat steam from high-consistency refining, and the chip bin steam pipe is the branch of the pipe for delivering the waste heat steam; the pipe for delivering the foul heat steam and the pipe for delivering the waste heat steam are communicated with the reboiling furnace; the washing water tank steam pipe is communicated with a washing tank; the chip bin steam pipe is communicated with a chip bin; and the reboiling furnace is used for delivering the fresh steam subjected to heat exchange to an alkali recovery plant through a fresh-steam pipe, condensing the waste heat steam subjected to heat exchange into the foul-heat condensed water and delivering the foul-heat condensed water to the alkali recovery plant through a condensed water pipe. The steam is supplied to the washing water tank and the chip bin first, and the total foul and waste heat steam generated from high-consistency refining is shunt, thus the load of the reboiling furnace is reduced, and the left steam is recovered completely without being discharged into air. The system consumes the least energy, is environment-friendly and has significant economic benefits.

Description

(1) Technical field: [0001] The invention relates to a heat recovery system for the papermaking industry, in particular to a PRC-APMP method pulp production line high-concentration mill waste heat and steam recovery system. (2) Background technology: [0002] PRC-APMP chemical-mechanical pulping is a relatively energy-saving, environmentally friendly, and mature advanced pulping method in the world. The main process technology and equipment are provided by the Austrian ANDRITZ company. [0003] As we all know, chemical-mechanical pulp pulping consumes a lot of electric energy. At present, the relatively advanced chemical-mechanical pulp workshop consumes 1150KWH~1200KWH per ton of pulp. In the pulping plant using this technology, the high-concentration mill is the key equipment of the system. 70% of the electricity consumed by pulping in the pulping workshop is consumed by this equipment, and about 85% to 90% of the electricity consumed by the high-consistency mill in the refining ...

AI Technical Summary

Problems solved by technology

[0004] The original supporting heat recovery system cannot completely digest the waste steam generated by the high-consistency mill, and the excess waste steam of about 2 to 3 tons per hour cannot be effectively recycled and can only be discharged to the atmosphere, and the waste steam contains Bleaching chemicals and pulp, causing heat loss and polluting the atmosphere, causing economic losses and not being environmentally friendly

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