Modern textile air conditioners are gradually established with the development of the new China textile industry. Their main task is to create and maintain air conditions that meet certain requirements in the production workshop, so that the temperature, humidity, flow speed and dust in the workshop Concentration and freshness can meet the requirements of production process and human body comfort, and will not change due to outdoor air parameters and various factors in the room.
There are two general effects of textile air conditioning:
First, it meets the temperature and humidity conditions suitable for the textile production process;
Second, improve working conditions, protect employee health, and increase labor productivity.
Therefore, serious research and resolution of air-conditioning energy-saving issues is an urgent task before us. Here is a brief introduction to some measures and methods for energy saving in air conditioning in textile mills.
1. Update of air conditioning equipment:
The fan is the core equipment of the air conditioning system. Most of the original textile air conditioners are Y-type axial flow fans. It is characterized by small air volume, high power consumption, low efficiency, belt drive, high operating cost, and sometimes “coal”. Gray yarn" affects product quality. Later, after being transformed into FZ series axial flow fan, the motor shaft and the air blade are directly connected, no belt drive is needed, and the operation efficiency is improved. The two-speed fan has two speeds, which can meet the needs of different seasons and reduce the need of different seasons. The operating cost, and easy to overhaul, quickly gained promotion (Jinxin Textile Air Conditioning).
During this period, some fan control devices that are more convenient to adjust and save energy have appeared. One is to transform into a variable frequency speed control fan. This can be adjusted by adding a frequency converter or a stepless speed control system. The air volume can be adjusted more freely, realize on-demand adjustment, and energy saving; the second is to use PLC technology to realize unified control and automatic operation of air conditioners such as fans and pumps, so that the operation and operation of each equipment can fully meet the production requirements. As a goal, self-regulation under the centralized command of the central center will further make unmanned adjustment a reality.
The washing chamber is the main place for the textile air conditioner to humidify, dehumidify and cool the air. The development of the washing chamber has also gone through the process from single flow to continuous spray to reverse spray, from double screw centrifugal nozzle to FL swirl nozzle. The ultimate goal is to make the sprayed water droplets smaller, the spray angle larger, and the coverage of the water mist larger; the water curtain formed by the spray makes the sprayed water droplets collide with each other to become finer and atomized to a better extent. The water curtain formed by the cross section of the air-conditioned room allows the air-heat exchange time to be longer and more fully when the air passes through the washing chamber, thereby improving the air-conditioning capability. At present, such a spray-discharge method is more common in China.
2. Reasonable use of return air, temperature and humidity
Reasonable use of return air not only stabilizes the temperature and humidity of the workshop, reduces production fluctuations, improves production quality, but also greatly reduces air conditioning energy consumption. Even in the transition period of spring, summer and autumn and winter, as long as the new and return air ratio and the use of circulating water spray washing air are regulated, the purpose of improving the air supply quality and saving energy can be achieved. Especially in the summer, as the outdoor wet bulb temperature increases, the amount of return air must increase accordingly, otherwise it will cause waste of cooling. Fresh air loads account for a large proportion of air conditioning loads. While meeting the hygiene requirements, we must maintain a positive pressure in the workshop. Under normal circumstances, the fresh air volume can be 10% of the air supply volume of the system. Because the air supply volume of each workshop is generally large, it has met the hygienic requirements of 30m3/h per person.
In the summer, the temperature of the workshop is reduced by 1 °C, and the airflow per 10,000 cubic meters is increased by 1 kW, which is equivalent to 50% of the air conditioning power. In winter, when the base is lowered from 22 ° C to 20 ° C, the heating load can be reduced by about 26% to 31%. Therefore, from the point of view of energy saving, the upper limit of the temperature base in summer and the lower limit of the temperature base in winter are selected. Cotton fiber is a kind of hydrophilic fiber, and its hygroscopic property is strong, so the relative humidity has a greater impact on its performance than temperature. In summer, the humidity in most places is relatively large, so the base of relative humidity can take a higher value; the lower relative humidity in winter should be lower, the dew point temperature is reduced by 2 °C, and the humidification load can be reduced by 5%.
3. Rational use of natural resources
Actively promote deep well recharge technology, use winter energy storage for summer cooling, and summer energy storage for winter heating. In order to effectively use the limited low-temperature winter irrigation well water, comprehensive scheduling should be implemented for the cooling capacity, that is, the mechanical cooling water is used to make the bottoming when watering, and the insufficient part is supplemented by well water. This measure is more important for the implementation of the "low temperature water, small water volume, low dew point" adjustment method. Carry out the principle of “one water and more use”, so that the low temperature water can be spun and reused repeatedly. If the water temperature of the final discharge water is still lower than the surface water, it can also be used as cooling water to improve the efficiency of the refrigeration equipment. Actively promote the secondary spray room and use the cold water. According to estimates, using a two-stage spray room, the amount of deep well water can be saved by about 1/3. Moreover, the cost of upgrading to a secondary spray room on the basis of the first-stage spray chamber is not large, and there is a complete account. The method of directly spraying air with low-temperature water and appropriately increasing the water volume of the water-blocking plate can reduce the air supply volume and water spray volume of the workshop to achieve the purpose of energy saving (Jinxin Textile Air Conditioning).
4. Other influencing factors
Improve the recycling rate of air conditioning water systems. After years of improvement, the recycling rate of air-conditioning water systems of various enterprises has reached a fairly high level, and the water supply and recycling have become a relatively mature textile air-conditioning water supply system. However, with the limited mining and forbidden mining of groundwater, especially urban groundwater, the amount of underground deep well water extraction is reduced. The tap water with high water temperature is used. The air conditioning water that can be used multiple times according to the water source temperature has to be cooled as a unit after one use. Water, or filtered, disinfected and sent to non-potable water systems such as baths, toilets, and greening. The increase in water temperature will greatly reduce the efficiency of use, and the energy costs will increase.