U tube heat exchanger is suitable for the large temperature difference between tube side and shell side. The shell side media is easy to scale and needs cleaning, while the tube side media is clean and not easy to scale. It is also suitable for high temperature, high pressure, fluid corrosive working conditions.
Each heat exchange tube is bent into U-shape, the two ends are fixed in the upper and lower areas of the same Tube Sheet, and divided into two chambers of inlet and outlet with the partition in the tube box. This kind of heat exchanger completely eliminates the thermal stress, the structure is simpler than the floating type, but the tube side is not easy to clean.
The number of tubes is small, the utilization of the tube sheet is not frequent, and the shell side fluid is easy to short circuiting, which is unfavorable to heat transfer. If there is a leak or damage in the tube, the external U-tube can be replaced, while the broken inner tube can not be replaced, only plugged, and one broken U-tube means two broken, so the U-tube easily scrapped.
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The broad shopping malls need to greatly influence the innovation and growth of domestic gas detection instrumentation production companies. The total domestic civil gas detector output increased from 1.9 million units in 2000 to 3.1 million units in 2008. The total industrial gas detector output increased from 170,000 units in 2000 to 960,000 units in 2008.
Gas detection equipment used in the industrial category is dominated by high-end shopping malls for imported products, and many low-end shopping malls are occupied by many domestic small planning companies.
In gas detection instruments and meters, because of the relatively low skill and financial threshold for independent gas detection instrumentation, the companies that produce such gas detection instruments and meters are the most, and many companies only produce such gas detection instruments and meters. At present, the larger domestic manufacturers in this category are Shenzhen Jianda Technology Co., Ltd. and Shenzhen Haoen Industrial Co., Ltd. Shenzhen Jianda Technology Co., Ltd. is the most advanced in terms of skills and quality control, and has more foreign trade and export. Ji'anda Technology has a comparative advantage in high-end industrial detector shopping malls and cooperates with CNPC, Sinopec, South China Gas Industry, and FAW Group.
Industrial gas detection instrumentation has a relatively low skill and capital threshold, and relatively few production companies, and usually has relatively strong strength and planning. The most well-known companies in China are: Shenzhen Jianda Technology Co., Ltd., Beijing Keliheng Co., Ltd., Shenzhen TeAn Electronics Co., Ltd., Chengdu Antrust Electronics Co., Ltd., Harbin Dongfang Alarm Equipment Co., Ltd. and several other companies. In the meantime, Beijing Keliheng is a US-funded company. Its skills in point-type gas detectors are ahead of schedule and it is mainly sold to the metallurgical industry. Shenzhen Jianda Technology Co., Ltd. earlier engaged in gas detection career, the product has a good reputation in the industry, the primary sale of occupations are petroleum, petrochemical, gas, fire and other areas. Henan Hanwei Electronics Co., Ltd. has a complete product line with high performance-to-price ratio. Its sales scope includes petroleum, chemical and metallurgy, mining, gas, and traffic safety. Its market share in industrial portable and other detectors reaches approximately 11% and 9.8% respectively. . Jinan Changqing Computer Co., Ltd. has achieved good results in the field of gas. Many brands of imported products occupy a lot of high-end shopping malls, have a high market share and outstanding quality of reputation, but they are expensive.
From the above data. Domestic gas detection instrument career because of the launch of a shorter time, civil, commercial gas detection equipment skills threshold is low, laws and regulations are not strict, shopping malls are mainly occupied by domestic companies, many small planning companies to split more than half the market share.
The professional market economy of gas detection instruments and meters has broad potential and space for development. It has the opportunity and co-existence, and along with the rapid development of China's economy, the profession is moving toward foreign markets and opens up more space for development.
Rapid development of gas detector industry
The rapid development of gas detectors along with the Chinese economy will also usher in a period of rapid growth. Compared with more than 20% of instrumentation professions in recent years, malls increase their speed. The speed of gas detection instrumentation profession is reaching an astonishing 30%. According to calculations, in the next five years, the scope of the above-mentioned categories of gas detection equipment for home business needs up to more than 10 million units; industrial combustible gas detection equipment needs more than 5 million units, during which the demand for infrared gas detection equipment will reach 1.7 million The capacity of Taiwan (sets) and shopping malls is approximately 6.8 billion yuan; the demand for electrochemical instruments for measuring toxic gases will reach 4 million units (sets), and the mall will have a capacity of approximately 5.6 billion yuan. The shopping malls will have broad prospects and increase agility.