With the continuous deepening of China's market economy and the reform of the heating system, energy saving and charging in the heating industry has become a hot topic of universal concern. This article aims at the current situation of heating in northern China and discusses the practical application and effect of IC card control valve in urban district heating. First, the basic working principle of IC card control valve IC card control valve to smart IC card for information carrier, using a card a valve work. The heating management department will first write some relevant information, such as user data, control valve work and the user to buy the thermal time written in the IC card, and then the IC card to transmit these data to the control valve chip. Control valve to accept the data, under the control of the program in accordance with the requirements of the user to complete a series of work, at the same time automatic billing. When the valve with less than the balance of hot time, the control valve will alert the user in advance to remind the user to recharge, shut down automatically when exhausted. Second, the IC card control valve household control prepaid function IC card control valve household control pre-paid management, this management has changed the original heating fee system, on the one hand with the heating households in the payment of heating costs Change from passive to active, how much you use for thermal energy, how much you use your money wisely. On the other hand, the heating sector has saved a lot of manpower and material resources, and fundamentally solved the problem of heating department fees. In addition the IC card control valve can effectively prevent the phenomenon of theft, and its management software, hot "blacklist" query capabilities to promptly analyze and identify potential heat theft. Third, the energy-saving effect of IC card control valve and antifreeze cracking IC card control valve has a very good energy-saving effect, it has two working modes, one is "energy-saving mode" and the other is "normal mode." The heat management department can switch freely between the two modes and set the operating parameters for both modes. In energy-saving mode, users use the IC card after recharge to open the valve, the user can open and close the control valve. When the exhausted heat time or the dry cell battery is insufficient, the valve will be automatically closed, the user can not open the valve at this time, until the user recharge or replace the new battery. In this way, users can open and close the valve according to their needs, saving heat costs, but also save heat. IC card control valve also has a strong room temperature regulation. When the room temperature is high, the user can enable the room temperature adjustment function, the control valve will be turned on for a period of time automatically shut down for a period of time to adjust the room temperature. Thus avoiding the user room temperature is too high and waste heat, but also for the user to save some heat costs. IC card control valve strong pipeline antifreeze function, for the sale of vacant rooms and temporary unoccupied rooms particularly effective energy saving. The control valve keeps the temperature of the room's heating pipes free from frost by automatically turning on for an hour after each shutdown for 1 hour, which not only provides reliable protection of the heating ducts in the user's room but also saves a great amount of heat for the user . Antifreeze crack function or room temperature regulation enabled, each valve open heating IC card control valve will automatically billing, which also ensures that heating units receivable heating costs will not be lost. When the normal mode is selected, the user can not open or close the valve after the user opens the valve by using the IC card after purchasing the heat. However, the valve will close automatically when it runs out of heat. Fourth, the IC card control valve billing and other features IC card control valve billing from the current situation in China's actual heating starting with the regional price, heating area, the use of hot time as a parameter by hot time billing , Has a very wide range of practicality. IC card control valve design of the appearance of the product fully reflects the humane design concept, intuitive display on the LCD screen allows users to control the current state of the intelligent control valve and user information such as remaining hot at a glance. IC card control valve management software, friendly interface, easy to learn, with flexible multi-user network management capabilities, the operator can be very convenient for users to open an account, recharge, make up cards and pin cards and other operations, according to the software user Permission to query user data, statistical analysis of data and report output, the operation is very convenient and quick. V. Summary IC card control valve system on the current heating in several difficult issues, such as: charging difficult, energy saving, measurement, antifreeze cracking and other aspects with strong pertinence and effectiveness. Some of these features are difficult to achieve when heat meters are popularized and applied under the current heating management system in our country. IC card control valve development and application of a modern electronic technology and mechanical automation technology as one of the smart timing of high-tech products, but also the heating sector under the current conditions as a household control heating products a better choice. References [1] Xu Wenfa, Zhao Jiancheng, Li Bin Tao. Preliminary Study on the Management of Household Metering Charges and Related Problems. China Construction Information Heating and cooling special issue. 2001 the first 11 [2] Wang Zhichao, Di Hongfa. Heating metering and charging status quo and problems. District heating. 2003 the third period [3] Xu Wei, Huang Wei, Zou Yu. Progress and Review of Household Metering Technology in Heating System. China Construction Information Heating and cooling special issue.
Pharmaceutical Intermediates
Pharmaceutical intermediates are actually some chemical raw materials or products used in the synthesis process. Chemical products do not need that kind of production license. They can be produced in ordinary chemical plants. As long as they reach some grades, they can be synthesized appropriately.
Types of intermediates
Intermediates refer to semi-finished products, which are intermediate products in the production of certain products. For example, to produce a product, it can be produced from intermediates to save costs.
Intermediates are formed from cyclic compounds such as benzene, naphthalene, anthracene, etc. through sulfonation, alkali fusion, nitration, reduction, etc. For example, benzene is nitrated to nitrobenzene, and then reduced to aniline, which can be chemically processed into dyes, drugs, vulcanization accelerators, etc. Both nitrobenzene and aniline are intermediates.
There are also acyclic compounds such as methane, acetylene, propylene, butane, butene, etc. through dehydrogenation, polymerization, halogenation, hydrolysis and other reactions. For example, butane or butene is dehydrogenated to butadiene, which can be chemically processed into synthetic rubber, synthetic fibers, and the like.
Butadiene is an intermediate.
It originally refers to the intermediate products produced in the process of synthesizing chemical products such as spices, dyes, resins, drugs, plasticizers, rubber accelerators, etc. using coal tar or petroleum products as raw materials. It now generally refers to various intermediate products obtained in the process of organic synthesis.
5-Bromo-2 4-dichloropyrimidine,4-Bromo-2-fluorobenzoic acid,4-Bromo-2-fluorobenzaldehyde,6-(4-Aminophenyl)-4 5-dihydro-5-methyl-3(2H)-pyridazinone
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