This site2018-12-25 11:32:18
On-line composite gas detector
Overview of online composite gas detector
The controller displays the gas concentration. When the set alarm concentration is exceeded, the alarm controller sends out an audible and visual alarm signal, outputs a linkage control signal, and controls the fan and other equipment to eliminate danger, thereby ensuring the safe production of the factory. Avoid accidents.
The detector uses an imported catalytic combustion sensor to detect the gas concentration through free diffusion, and has excellent sensitivity and repeatability.
Modular intelligent gas detector (hereinafter referred to as "detector") is a fixed and continuous detection of the concentration of combustible gas, oxygen or toxic gas in the working environment.
how to choose
When using natural gas, artificial gas or gas with a relative density of less than 1, the installation distance between the gas detector and the center of the release source should not be greater than 8m, nor should it be less than 1m. For example, in many refineries and chemical plants, the release of toxic (toxic gas alarm) and explosive (flammable gas alarm) gases from equipment is common, and flammable gas alarms should take full account of all possible situations. If used in an emergency, leak detection and monitoring, pumping, short response time, high sensitivity, and high resolution instruments should be used to easily determine the location of the leak. Commonly used flammable (toxic) gas detection alarm devices are mainly divided into fixed gas detection alarm systems and portable gas detectors.
When testing the reliability of gas detection alarms such as flammable gas detectors, the LPG of the fire truck is in direct contact with the sensor, resulting in damage to the gas sensor and reduction or failure of the detector sensitivity. What is the difference between the temperature of the gas itself and the temperature of the sensor? The temperature of the sensor itself determines its lower display current, and the temperature of the measured gas sample has a certain effect on this. If the flammable gas detector is not located near the flammable gas leaking device or installed near the exhaust fan, the leaked flammable gas cannot spread sufficiently near the flammable gas detector, so the flammable gas detector cannot detect the leakage risk in a timely manner. The second fault alarm: the gas detector is not registered, cause analysis: the gas detector is disconnected or short-circuited with the alarm controller, the solution: (1) check the controller terminals and transmission lines are tight, (2) check the power transmission Whether the line is open or shorted. Accuracy cannot be adjusted for standard gas samples. The explosion-proof hood is heavily dusty and the sensor is aging.
On-line composite gas detectors These gases bring convenience to people's energy, production and life, but they are toxic and flammable chemicals, and they also bury the hidden dangers of fire, poisoning and explosion for users of gas burners. Aiming at the global flammable gas alarm market including China, the United States, Europe and Asia (excluding China), the flammable gas alarm industry analysis report covers product classification, product application, development trends, product technology, competitive landscape, etc., and covers Combustible gas alarm price, cost, gross profit, etc. Combustible gas alarms in major regions and enterprises of the world from 2011 to 2016. Detailed data such as output values.
As the heating season approaches, the haze in Beijing is making a comeback. On November 14, the haze images were removed from their circle of friends, and netizens invented a new "solar term"-Lihaohaze. It is understood that last year, in order to alleviate the haze weather and solve environmental problems, the use of coal instead of gas for heating led to a shortage of natural gas in 2017. With the coming of the heating season this year, analysts in the natural gas industry told reporters that considering last year ’s experience, The government has taken a number of measures this year to ensure that both the supply and demand sides can use the gas smoothly. However, the contradiction between supply and demand this winter cannot be ignored. If the cold weather continues, regional disparities will occur. In fact, the fight to avoid a recurrence of tight gas supplies has been going on since this spring. While increasing domestic natural gas production, China is also actively establishing a diversified overseas supply system. However, some analysts said that no matter how strong the implementation of coal-to-gas conversion in 2018 is, the objective situation of natural gas shortage cannot be fundamentally improved, and natural gas prices are likely to rise in the heating season due to tight natural gas supply. According to the statistics bureau, China's natural gas and electricity production remained stable in October. Data show that the natural gas output in October reached 13.4 billion cubic meters, an increase of 1 percentage point from the same period last month; the average daily output of natural gas reached 100 million cubic meters, with an average annual growth of 100 million cubic meters. From January to October this year, natural gas production was 129.5 billion cubic meters, an increase over the same period last year. In October, natural gas imports were 7.3 million tons, a year-on-year increase of 3 percentage points and a year-on-year decrease of 320,000 tons. In January and October this year, natural gas imports were 72.06 million tons and 72.06 million tons. "The demand for natural gas is seasonal. The demand for natural gas has increased year by year during the winter heating period. The coal-to-gas policy implemented in the past two years has exacerbated the growth of winter natural gas demand. In 2017, China's imports of liquefied natural gas compared to the same period last year. The increase resulted in overloading of the receiving station in the peak season. The utilization rate of LNG receiving stations in Japan, South Korea, and the United Kingdom was stable at 25-40% throughout the year. However, due to the shortage of LNG receiving stations, the capacity of LNG receiving stations in our country is limited. Annual utilization The rate is about 60%, well above the average of developed countries. "Some analysts point out. However, some people pointed out that although the market price will gradually rise with the gradual increase in heating demand in the north, due to the central government's full preparations for various enterprises this year, production and imports have increased compared to last year. In addition, the current receiving station has sufficient LNG import reserves in order to reach the peak of winter, and the receiving station is expensive. As a result, last year's growth is difficult to reproduce. China's natural gas imports increased by nearly 40%. As winter approaches, demand for natural gas may rise further. From a regional perspective, the import volume of liquefied natural gas in the northern region increased significantly in 2017, and the four receiving stations in Shandong, Caofeidian, Tianjin, and Dalian jointly increased by 86%. The total import volume of the eastern coastal areas, such as eastern, Zhejiang, Shanghai, and Qidong, totaled Volume increased by 65% year-on-year, and LNG imports in the southern region were relatively stable. The comprehensive growth rate of LNG receiving stations in Fujian, Guangxi, Guangdong, and Hainan was only 13%. Rising crude oil and LNG prices have cost China more. According to statistics, China's oil imports in 2017 were 100 million US dollars, higher than the same period last year, and natural gas imports were 100 million US dollars. These two investments total $ 185.6 billion. By 2018, China's natural gas imports from January to August were 57.18 million tons, an increase from the same period last year; the import value was 1 billion US dollars, which was higher than the same period last year. According to the growth rate in the first eight months of this year, the total imports in the first nine months of this year will exceed the total in 2017. However, China is increasingly dependent on imported natural gas. In 2017, China's apparent natural gas consumption was 235.2 billion cubic meters, while imported natural gas was 87.6 billion cubic meters. Among them, 39.5 billion cubic meters of imported natural gas pipelines, accounting for 45.5% of total imports, and 48.1 billion cubic meters of liquefied natural gas imports, accounting for about 55% of total imports. At present, imported LNG is one of China's major suppliers. According to the statistics of the General Administration of Customs, from January to September this year, China's natural gas imports increased by 34% over the same period of the previous year, reaching 64.78 million tons. Fatih Birol, chairman of the International Energy Agency, predicts that by December, China will overtake Japan as a global natural gas importer. After last winter, for the first time this spring, “South-North Gas” helped North China ’s natural gas supply. As the second largest natural gas supplier and LNG importer CNOOC, it plans to supply 24.6 billion cubic meters in the next heating season from 2018 to 2019. Natural gas increased by 20 million cubic meters compared with the same period last year. The supply of natural gas in the seven northern provinces and cities was 6.1 billion cubic meters, an increase over the same period last year. In order to meet the needs of downstream users, the construction of a pipeline network is particularly important. The executive meeting of the State Council held on August 22 this year put forward the need to promote the coordinated and stable development of natural gas, including strengthening network connectivity. Currently, the process of local network connection is accelerating. Recently, at the Tianjin LNG Port Terminal, the East China Sea Oil Mengxi Coal Gas Pipeline was docked with the Tianjin LNG Pipeline. According to reports, after the completion of the Mengxi Pipeline Interconnected Section, it will be able to supply 8 million cubic meters of natural gas per day to North China during the heating period from this winter to next spring, alleviating the shortage of natural gas supply in the region. With the implementation of the Blue Sky Plan and the implementation of the northern winter clean heating policy, the domestic natural gas market has ushered in a period of rapid development. From the status quo of traditional peak shaving gas sources, imported LNG has become one of the main gas sources. But at this stage, China's imported LNG infrastructure is mainly distributed in the southern region. After entering winter, the natural gas gap in the northern region is large. The existing pipeline transportation and liquid tank truck transportation methods cannot fully release the remaining capacity of the southern terminal in China, so it is necessary to continuously innovate the natural gas transportation model and further promote the construction of natural gas production, supply, supply and marketing systems. Multimodal transport of LNG containers is one of the most popular modes of transport in recent years. Compared with traditional pipeline transportation, LNG storage tanks are more flexible and more suitable for storage and transportation. It is understood that 130 LNG storage tanks will be transported from the LNG receiving station with excess capacity in the South to the North by shipping, with a single tank gasification capacity of 10,000 square meters. It can be used by 500 households in northern rural areas for 5 days during the winter heating peak. Once this new mode of transportation is scaled up and commercialized, it will form an offshore natural gas transportation artery that moves along China's coasts, and will effectively complement traditional land gas pipelines and tank transportation methods. It is understood that the LNG storage tank is safe and reliable. After repeated tests by professional organizations, its overall structure is solid and reliable, and no liquid will volatilize in the tank within 90 days. In this test project, CNOOC installed Beidou locator and liquid level sensor in each oil tank, ensuring that the oil tank can be monitored in real time in any place such as land yard, dock loading and unloading, and shipping, which greatly improves the safety of the entire transportation link Sex.