Paper drying energy comprehensive utilization system for steam and hot air combined supply boiler

Abstract

The invention provides a paper drying energy comprehensive utilization system for a steam and hot air combined supply boiler and relates to the field of paper making. The system comprises a hot air supply device, a steam supply device, a hot air utilization device and a steam utilization device. The hot air supply device is connected with the hot air utilization device through a hot air pipeline. The steam supply device is connected with the steam utilization device through a steam pipeline. The hot air supply device and the steam supply device are the same equipment. Steam generated by the steam and hot air combined supply boiler flows to the steam pipeline communicated with the steam utilization device. The steam and hot air combined supply boiler is adopted for generating steam used by the steam utilization device and generating high-temperature hot air used by the hot air utilization device. The steam and hot air combined supply boiler burns clean gas or fuel oil, so that the dust content of smoke is low. Hot air acquired after heat exchange is conveyed to a hot air utilization system. The temperature of the hot air generated by the steam and hot air combined supply boiler is not lower than 300 DEG C.

Description

technical field [0001] The invention relates to a drying and heat energy supply system in the pulping and papermaking industries, in particular to a system that can reduce equipment investment in the field of toilet paper and coated paper production, make full use of exhaust waste heat of a hot air utilization device, and improve heat energy production and utilization efficiency. An integrated system of energy production and utilization that significantly reduces paper drying costs. Background technique [0002] Hot air drying is a commonly used drying method in the pulp and paper industry. During the drying process, the hot air is in direct contact with the pulp or paper to transfer mass and energy. The hot air requires high temperature and cleanliness. [0003] Hot air drying usually uses burners to directly burn natural gas or liquefied petroleum gas, and the high-temperature flue gas produced is used as the drying medium of the drying system. In addition, hot air dryin...

AI Technical Summary

Problems solved by technology

[0007] As mentioned above, the production of toilet paper needs to consume steam and high-temperature hot air. If clean fossil fuels (such as natural gas, liquefied petroleum gas, etc.) are used to burn in natural gas boilers to produce steam for use in drying cylinders, and to produce high-temperature smoke in burners Gas is used as the drying medium for the hot air drying system of the paper machine, and the total consumption of natural gas per ton of paper is often as high as 170-230 NmL (see Table I ), the corresponding drying energy cost per ton of paper is about 600-900 yuan, and the drying cost is very expensive

[0008] The output of toilet paper mills is usually small. Although the unit consumption of steam and electricity for toilet paper production is relatively large, the absolute quantity is not very large. In pure toilet paper mills, there is no condition for configuring self-provided power plants for combined heat and power. It is relatively cheap to obtain There are only two ways of steam, outsourcing or self-provided small steam boilers. In areas with strict environmental protection requirements, coal-fired boilers will be limited, and outsourcing steam will be limited by external conditions. In this way, natural gas ( Generally refers to clean fuel) has become the only energy source for producing steam and providing hot air. Compared with traditional energy sources such as biomass and coal, natural gas is very expensive. China's national conditions of rich coal, little gas, and poor oil determine that natural gas is a scarce resource In the long run, the price will continue to rise. Only using natural gas will inevitably lead to high toilet paper drying costs. In today's fierce market competition, toilet paper manufacturers urgently need a new technology to generate cheap steam and high-temperature hot air. Reduce operating costs and enhance corporate competitiveness

Images