Control system for tail gas absorption in production process

Abstract

The invention relates to the technical field of caffeine production equipment, especially to a control system for tail gas absorption in production process. The control system comprises: a first absorption tower and a second absorption tower; an absorption liquid supply unit, which is used for simultaneously supplying liquid ammonia to the first absorption tower and the second absorption tower soas to allow the liquid ammonia to enter the first absorption tower and the second absorption tower and to be respectively in reverse contact with tail gas of the first absorption tower and the secondabsorption tower; a liquid collection unit, which is used for collecting liquid ammonia after reactions of the tail gas in the first absorption tower and the second absorption tower; a detection unit,which is used for detecting the content of nitrogen oxides at the downstream process of the first absorption tower and the second absorption tower; a signal receiving unit; an identification unit; and execution units, which are used for receiving a first driving signal, a second driving signal and a third driving signal to drive the absorption liquid supply unit to supply the flow of liquid ammonia to the first absorption tower and the second absorption tower at the same moment so as to realize more accurate liquid ammonia consumption control.

Description

technical field [0001] The invention relates to the technical field of caffeine production equipment, in particular to an exhaust gas absorption control system in a production process. Background technique [0002] The production of caffeine products is based on cyanoacetic acid as the starting material, adding dimethylurea and acetic anhydride to prepare 1,3-dimethyl cyanoacetyl urea through condensation reaction; 1,3-dimethyl cyanoacetyl urea is then added with liquid hydrogen Sodium oxide was prepared by cyclization reaction to produce 1,3-dimethyl-4-imidocarbazine (DM 4AU); 1,3-Dimethyl-4-imino-5-isonitrosourazine (DM·NAU) is prepared by nitrosation reaction; a certain amount of nitrogen dioxide, a Nitrogen oxides can be called tail gas. In the prior art, liquid ammonia is mainly used for absorption, and water and nitrogen are generated after the reaction, which can be discharged. However, in practical applications, various raw materials are received, such as starting r...

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Problems solved by technology

[0003] The present invention aims to solve the problem that in the prior art, nitrogen dioxide and nitric oxide are used as tail gas to absorb insufficiently in practical applications, which will cause the discharge of existing tail gas to exceed the standard, and cannot effectively obtain sufficient tail gas absorption. The dosage is also lack of effective control, there is a risk of secondary pollution in the tail gas treatment process, there are technical problems, and a tail gas absorption control system in the production process is provided

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