Automatic temperature control system for crystallized phosphoric acid production
A technology of automatic temperature control and automatic control valve, applied in phosphorus compounds, lighting and heating equipment, inorganic chemistry, etc., can solve the problems of inaccuracy and inconvenient operation, and achieve fast heating, rapid switching process and accurate temperature control Effect
Inactive Publication Date: 2012-08-01
WENGFU (GRP) CO LTD
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[0003] The purpose of the present invention is to overcome the defects of the prior art and provide an automatic temperature control system for the production of crystalline phosphoric acid. Quickly heat up in a short time to remove crystal scale, solve the problem of inconvenient and inaccurate manual operation, and there will be no confusion between media
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[0014] attached figure 1 The structure of the present invention is illustrated. A crystalline phosphoric acid production automatic temperature control system of a certain phosphorus industry limited liability company includes a crystallizer 1 and a plate heat exchanger. It is characterized in that there are two plate heat exchangers, one of which is Refrigerating heat exchanger 5, the other is heating heat exchanger 2, cooling heat exchanger 5 is connected with automatic control valve 4, heating heat exchanger 2 is connected with automatic control valve 3, and the crystallizer 1 is connected with circulating water pipe 7. The circulating water pipe 7 is connected with the automatic control valve 6, and the circulating water pipe 7 connects the crystallizer 1, the heating heat exchanger 2 and the cooling heat exchanger 5 in series, and there are three automatic control valves 3, 4 and 6 The automatic control valve signal is connected to the central control DCS.
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The invention discloses an automatic temperature control system for crystallized phosphoric acid production, which comprises a crystallizer and plate-type heat exchangers; and the automatic temperature control system is characterized in that the number of the plate-type heat exchanger is two, one is a refrigerating heat exchanger, and the other one is a heating heat exchanger, the two plate-type heat exchangers are respectively provided with an automatic control valve, the crystallizer is connected with a circulating water pipe, the circulating water pipe is connected with an automatic control valve, the crystallizer and the two plate-type heat exchangers are connected in series by the circulating water pipe, and the three automatic control valves are connected to a central control DCS (distributed control system) by way of signal access. In the process of cooling operation, the DCS emits an instruction, the automatic control valve of the refrigerating heat exchanger is started, and the automatic control valve of the heating heat exchanger is closed; in the process of heating for scale removal, the automatic control valve of the heating heat exchanger is started, and the automatic control valve of the refrigerating heat exchanger is closed; and when the temperature raises to a preset value, the automatic control valve is immediately switched to a cooling state. According to the invention, the operation switching is quick, the crystallization and growing qualities of a phosphoric acid are good, and three mediums can not be confused, thereby ensuring the operation reliability and safety, so that the automatic temperature control system disclosed by the invention is suitable for the automatic temperature control of crystallized phosphoric acid production.
Description
technical field [0001] The invention relates to crystal production by crystallization, in particular to an automatic temperature control system for crystal phosphoric acid production. Background technique [0002] The crystallization method is used to produce crystalline phosphoric acid. Phosphoric acid crystals have high requirements for production equipment. The crystals are difficult to control and the crystallization conditions are harsh. Phosphoric acid crystallization and crystal growth need to be carried out at a relatively low temperature. During the crystallization and crystal growth process, the Crystal scale is formed on the inner wall of the crystallizer, and the thickness of the crystal scale increases with time. The crystal scale attached to the inner wall of the crystallizer will seriously hinder the heat transfer during cooling, so as to affect the cooling rate, prolong the cooling crystallization time, reduce production efficiency and increase production cos...
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IPC IPC(8): C01B25/234F28F27/00
Inventor 刘飞尹峰陶志
Owner WENGFU (GRP) CO LTD