Energy saving | Regarding the secondary use of energy in the textile industry

Textile refers to a kind of fiber or fiber assembly of multi-scale structure processing technology.Whether it is dyeing, drying, sizing, printing and dyeing are inseparable from the support and cooperation of steam boiler.The textile industry belongs to a relatively large industrial category. it consumes a large amount of energy.Therefore, the energy saving and emission reduction of the textile industry is particularly important.

In the textile industry, boilers mainly use small and medium-sized steam boilers.They often use natural gas as fuel.Because the textile industry consumes more energy, so in the process of energy consumption, the waste of energy is also more obvious.

How to make full use of energy effectively? we can improve the thermal efficiency of the boiler from the perspective of energy output. We can also carry out secondary energy saving in the energy application link. EPCB selects the research on energy saving application in the concentrated light lye link in the textile printing and dyeing industry to help the textile printing and dyeing industry save operating costs.

Secondary utilization of energy in textile printing and dyeing industry

At present, most of the printing and dyeing enterprises, mercerizing machine with 80% of the alkali, the light alkali returned by the mercerizing machine after the expansion evaporator concentration repeated use.In the process of concentration, the condensed water and cooling water can output 80% of the heat energy of the expansion evaporator .If we can use this part of heat energy fully, it is of great significance for enterprises energy saving, reduce consumption and improve product quality.

The heat loss caused by heat dissipation in the expansion evaporator in the process of light alkali concentration accounts for about 20%, and this heat energy can be reused.

Energy saving: the heat energy of the expansion evaporator that can be used twice

1. Steam condensate: high temperature pure water, all used for mercerizing machine washing box spray water.

2. Cooling water: with the same quality of production water supply, the maximum use for mercerizing machine and dyeing line with hot water washing box, as well as workers’ daily bathing and winter heating water source.

3. Steam alkali cooling water: distilled water with alkali content of 0.05g/L, all used for the combination of boiling and bleaching and water washing tank.

Energy saving application case of expansion evaporator

At present, the annual output of a company is 40 million meters. It produces all kinds of agricultural machinery weaving materials with cotton, polyester and elastic as raw materials within 1.8m gate width. It has two combination lines of desiccating and bleaching, one pair of straight-roll and stretch-roll pin-mercerizing machines, two pairs of pure cotton and polyester cotton dyeing lines, and two sets of JKZ-216 expansion evaporators.

Taking two months operation as the reference data, the production cost can be saved at least 147,000 yuan per month by making good use of the heat energy of the expansion evaporator.

(This data comes from a printing and dyeing company in Shanxi. If you need a detailed implementation plan, please contact EPCB.)

The expansion evaporator outputs condensed water and cooling water for secondary utilization, the supporting facilities are simple and reliable, the investment cost is low, and the corresponding printing and dyeing enterprises can be transformed and implemented.Belong to basic investment, investment, permanent income.Steam, steam light alkali condensate water and cooling water are used in different machines to reduce the energy consumption in the production process. All suitable printing and dyeing enterprises can carry out supporting transformation.


According to the latest research report of textile economic research center shows: China’s textile industry total energy consumption accounted for 4.3% of the total national industrial energy consumption, scale above the enterprise water consumption accounted for 8.51% of the national industrial enterprises, waste water discharge accounted for 10% of the total national industrial waste water discharge.In general, most textile printing and dyeing enterprises have insufficient investment in energy conservation and emission reduction, and the overall work of energy conservation and emission reduction in the industry still has a long way to go.