Energy-saving environment-friendly continuous cooking process

Abstract

The invention discloses an energy-saving environment-friendly continuous cooking process. A following process line mainly comprises a volume measurer (1), a screw feeder (2), a low-pressure cooking section (3), a pressure feeder (4), an ordinary cooking section (5), a slurry blowing vertical pipe (6), a blowing tank (7), a breather valve (8), an explosion-proof device (9) and a steam pressurization device (10). The process is characterized in that the low-grade waste steam of the blowing tank is recovered and pressurized for low-pressure cooking by special process equipment and a special process flow; and the whole steam utilization flow from feeding, low-pressure cooking, ordinary cooking and slurry blowing to the pressure recycling of the waste steam is airtight and cyclic, and the discharge of waste heat stream and ozone is avoided, so that the process aims of energy saving and environmental protection are fulfilled.

Description

technical field [0001] The invention relates to an energy-saving and environment-friendly continuous cooking process, which belongs to the field of pulp and paper making, and is suitable for recycling waste heat and air purification of continuous cooking and cooking in pulp and paper making, and can also be used in other similar energy-saving environments. Background technique [0002] Pulping and papermaking horizontal tube continuous cooking (hereinafter referred to as continuous cooking) technology is widely used in my country, and its development has a history of more than 50 years. The main features of continuous steaming are continuous feeding and continuous pulping, smooth process and stable pulp quality. [0003] The general process of continuous steaming is: raw material slicing→dry preparation→wet preparation→screw dehydration conveying→slab meter→screw feeder→horizontal tube continuous steamer (composed of 3-5 horizontal tubes)→slurry spraying Put the standpipe →...

AI Technical Summary

Problems solved by technology

This treatment process has caused a great loss of waste heat. Although the amount of steam discharged per unit time is small, the total loss is very large because of the continuous discharge. According to relevant estimates, it is equivalent to one-third of the steam used for cooking. once lost

Moreover, this waste heat steam contains a large amount of malodorous hydrogen sulfide gas, which will cause serious environmental pollution if discharged into the atmosphere, which is a prominent technical problem in energy conservation and environmental protection.

Images