Dyeing waste water heat energy recovery method and recovery system

Abstract

This invention relates to a wastewater recycling method and recovery system of printing and dyeing industry, whose method is: thermal effluent was collected by different temperatures and was transported to at least one heat exchanger unit consisting of two heat exchangers directly or indirectly according to their own different temperatures; then, keep the hot water at different temperature level through the PLC control device, storage and distribute the water to all the requirements machines; the system includes hot collection devices, thermal effluent distribution devices, highly efficient heat exchanger, and PLC control devices. The hot collection devices are composed by sewage collection device at different temperature level. The storage unit of the collecting basin connects with the heat exchanger by at least one sewage pump. In the heat exchanger unit, there are some water heat exchanger channels and circulation channels, in which the hot water circulation pipes connect the production machine directly or indirectly. The system has simple composing, high-heat utilization of sewage, obvious energy saving effect and safe, reliable, easy to use, which can realize centralized control, improve work efficiency, and reduce the utility costs and so on.

Description

technical field [0001] The invention relates to a heat recovery method and a novel heat exchange energy recovery system specially used for waste water in the printing and dyeing industry, and belongs to the technical field of waste heat recovery generated in the production process of textile printing and dyeing enterprises. Background technique [0002] In the prior art, the heat energy recovery of waste water in the printing and dyeing process mainly adopts the following recovery equipment: 1. Install a heat exchange single unit nearby for heat energy exchange for heat water, and directly put the clean hot water generated by the exchange into Use a hot water machine. The advantage of this method is that it is flexible and maneuverable. The disadvantage is that the space next to the machine is small, and it is impossible to install larger heat exchange equipment. It is generally difficult to design a high heat exchange efficiency. Moreover, the working conditions on site are...

AI Technical Summary

Problems solved by technology

Since the selected heat exchange unit adopts large-scale tube-shell-side, spiral-plate type, or uses high-efficiency heat pipe technology, or large-scale heat pump unit for waste heat recovery, the recovery effect is good, but large-scale tube-side-shell-side, spiral-plate type In the poor water quality of printing and dyeing sewage, single blockage is easy to occur, and the high-efficiency heat pipe technology or large-scale heat pump unit has high investment costs and high operating costs. In the poor water quality environment, the sewage needs to be filtered and pre-treated, otherwise it is easy to occur For the generation of scale inhibition, it is also possible to perform conventional heat exchange first and then use heat pump technology to exchange heat after the clean water has obtained heat. It has high technological content, complex equipment process, high power consumption, and large investment.

At present, the heat exchange equipment or heat exchange units used in the textile printing and dyeing industry seldom adopt the method of internal and external forced turbulent flow, or internal turbulent flow or external turbulent flow, and the structure of the exchanger is sealed by tube and shell, cleaning , maintenance is very inconvenient

From the perspective of the development of heat exchangers, most of the heat exchange devices in the early stage have high requirements for pressure design. The designed heat exchangers are strong and durable, but the effective volume is small, the heat exchange tubes and plates are thick, the cost is high, and the heat exchange capacity is limited. Insufficient, poor adaptability to complex and harsh textile printing and dyeing wastewater heat transfer

Images