Boiler tubes is a one of seamless pipe. Manufacturing methods is the same as seamless tube, but it has the stringent requirements for manufacture of steel pipes. According to the temperature level,boiler tube is divided into general boiler tubes and high pressure boiler tube.
Boiler Tube,Boiler Seamless Tube,High Pressure Boiler Pipe,Boiler Seamless Steel Pipe Shandong Guanzhou Iron and Steel Group Co., Ltd. , https://www.guanzhousteel.com
Two treatments were set up in the test, one was to construct a small arch shed to cover the shading net, and the other was to cover the shading net as a control. On October 16, 2011, after the first week of cutting, the autumn tea plantings were divided into 2 plots. One plot covered the insulation film and shade net (shading net in the outer layer) at the same time as a greenhouse; another plot Keep unchanged as a control. Temperature and humidity recorders are placed in the shed to record the temperature and humidity of the air every hour. After 3 weeks of treatment, 21 tea plants were randomly selected from the treatment of the greenhouse and the control, and the plant height and callus rate were counted. At the same time, another 200 tea plants were harvested for each treatment. The sprouts were carefully peeled from the tea plants and immediately frozen in liquid nitrogen, and then stored at -70°C until use.
Through real-time temperature and humidity records of the temperature and humidity recorder, it was found that the treatment of the greenhouse can significantly increase the temperature and humidity needed for the growth of the tea seedlings. Taking the change in temperature and humidity of the insulation shed and the control on October 24 as an example, the insulation shed can increase the temperature by 1.7 to 12.6°C, with an average increase of 5.15°C and a humidity of -12.5% ​​to 37.6% with an average increase of 5.10%. The data collected was particularly significant at 8 to 17 hours (daytime), indicating that the insulation shed has a good effect of heat preservation and moisturizing.
Temperature and humidity recorder results show. Temperature and humidity are the main environmental factors that determine the growth rate and geographical distribution of tea plants. The early stage of tea growth requires higher temperature and humidity. Therefore, the use of heat preservation sheds can better solve the requirements of high temperature and high humidity for the growth of autumn and winter tea seedlings. Photosynthesis ability has extremely important significance for the growth of seedlings. Tea cuttings will consume the nutrient of stems and their mother leaves firstly after transplanting. On the one hand, roots will absorb water and various mineral elements. On the other hand, the sprouts of axillary buds will be supplied to form more leaves for photosynthesis. Therefore, rapid sprouting of axillary buds facilitates the plant to obtain more photosynthetic products. This study shows that high temperature and high humidity induce the synthesis of a large number of photosynthetic related genes and promote the growth of tea plants. This result is consistent with previous studies.
Production methods:
①general boiler tube temperature is below 350 ℃, using hot-rolled pipe or cold drawn tube manufacture Steel Pipe.
â‘¡ high-pressure boiler tube is used often in conditions of high temperature and high pressure pipe, the effect of high temperature flue gas and water vapor, oxidation and corrosion. Steel pipe with high rupture strength, high resistance to oxygen corrosion and have good organizational stability.
Boiler tubes purposes:
â‘ general boiler tubes is mainly used to manufacture water wall tubes, tubes in boiling water and super heated steam pipe, super heated steam locomotive boiler tubes, large and small smoke pipe and pipe arch brick.
â‘¡ high-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air guide tubes, main steam tubes, etc. for high-pressure and ultra-high-pressure boilers
Category:
General boiler tubes and high pressure boiler tube boiler tubes is exposed to high temperature performance. Boiler tubes in general, or high-pressure boiler tubes according to their use can be divided into a variety of steel pipe.
Temperature and Humidity Recorder Studying the Effect of Temperature and Humidity on Bud Germination of Tea Seedlings
The cutting of tea seedlings is affected by temperature and humidity. Therefore, the management of temperature and humidity after tea cuttings is particularly important. By constructing a heat preservation shed, the temperature and humidity in the shed can be effectively increased, and the growth of tea plants can be promoted. However, there is a lack of research on the molecular mechanism of temperature and humidity affecting the growth of tea plants. The temperature and humidity recorder can accurately measure the temperature and humidity data and provide data support for tea tree cutting protection.