Ammonia nitrogen on-line monitoring and control system and method for ammonia distillation section

Abstract

The invention discloses an ammonia nitrogen on-line monitoring and control system and method for an ammonia distillation section. The system comprises a detection system, a data processing system and a control system. The detection system is used for detecting main process parameters of an ammonia distillation section, and comprises effluent quality detection, temperature detection I, temperature detection II, temperature detection III, inflow water quality detection, pressure detection and ammonia water recovery flow detection. And the data processing system analyzes, learns and optimizes the data obtained from the detection system and outputs an instruction to the control system. The control system is used for accurately controlling process technical parameters according to instructions given by the data processing system, and the process technical parameters mainly comprise alkali liquor flow control, steam flow control, water outlet flow adjustment and water inlet flow adjustment. According to the method, the ammonia nitrogen content in the effluent can be predicted online in real time, and various parameter values in a control system can be automatically adjusted according to the set ammonia nitrogen content in the effluent, so that the purpose of automatic control is achieved. After the method is applied, the ammonia distillation efficiency can be improved, the consumption of raw materials can be reduced, and the generation of secondary wastes can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of measurement and control, and relates to an online monitoring and control system and method for ammonia nitrogen in an ammonia distillation section. Background Art

[0002] With the implementation of national energy conservation and environmental protection policies, and the rapid development of digitalization and intelligence, precise control, reduced energy consumption, improved raw material utilization and product quality have become the top priorities for enterprise development. The ammonia distillation section requires the addition of alkali to convert ammonia nitrogen in the water into free ammonia. Moreover, since ammonia molecules and water molecules have similar structures and very good compatibility, the water temperature needs to be heated to a higher temperature to evaporate the ammonia nitrogen in the water. Therefore, alkali and heat are the main consumption of the ammonia distillation section, which directly determines the operating cost of the ammonia distillation section. At present, it is mainly based on experience control, which cannot meet the needs of high-quality development. Only by using digital and intelligent integrated chemical reaction principles and systematically controlling various process parameters in the ammonia distillation process can energy and raw material consumption be reduced and ammonia distillation efficiency be improved. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of unstable water quality, low ammonia distillation efficiency, and inability to accurately control the amount of steam and alkali in an ammonia distillation section, and to provide an ammonia nitrogen online monitoring and control system and method for an ammonia distillation section. The system and method can predict the content of outlet ammonia nitrogen online, and can also automatically control the ammonia distillation process conditions according to the system given value to meet the demand for outlet ammonia nitrogen content.

[0004] To achieve the above-mentioned purpose, the ammonia nitrogen online monitoring and control system of the ammonia distillation section of the present invention includes a detection system, a data processing system and a control system. The detection system detects the main process parameters of the ammonia distillation section, including: effluent water quality detection, temperature detection I, temperature detection II, temperature detection III, influent water quality detection, pressure detection, and ammonia water recovery flow detection. The data processing system includes an input end and an output end, the input end is connected to effluent water quality detection, temperature detection I, temperature detection II, temperature detection III, influent water quality detection, pressure detection, and ammonia water recovery flow detection; the output end is connected to alkali liquid flow control, steam flow control, effluent flow regulation, and influent flow regulation. The control system includes: alkali liquid flow control, steam flow control, effluent flow regulation, and influent flow regulation.

[0005] Outlet water quality testing and inlet water quality testing include but are not limited to the testing of indicators such as ammonium ions, sulfate ions, hydrogen ions, sulfide ions, thiocyanate ions, cyanide, organic acids, etc. in the water.

[0006] The ammonia nitrogen online monitoring and control system and method of the ammonia distillation section of the present invention comprises the following steps:

[0007] Basic data is obtained through various detection units in the detection system, such as alkali liquid flow control, steam flow control, outlet water flow regulation, and inlet water flow regulation. Then the data is imported into the data processing system from the input end, analyzed, corrected, and optimized by the data processing system, and the output end issues instructions to the control system. Finally, the alkali liquid flow control, steam flow control, outlet water flow regulation, and inlet water flow regulation units accurately control the process technical parameters to achieve the purpose of optimized control.

[0008] The present invention has the following beneficial effects:

[0009] The ammonia nitrogen online monitoring and control system and method for the ammonia distillation section of the present invention can self-correct during operation. The more detection data there are, the more accurate the predicted ammonia nitrogen content in the effluent water is. The ammonia distillation process conditions can be more accurately controlled, and the efficiency of ammonia distillation can be improved while saving steam and alkali usage, greatly reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention.

[0011] Among them: ① alkali liquid flow control ② steam flow control outlet flow regulation ⑨ inlet flow regulation ④ outlet water quality detection ⑤ temperature detection Ⅰ ⑥ temperature detection Ⅱ ⑦ temperature detection Ⅲ ⑧ inlet water quality detection ⑩ pressure detection ammonia water recovery flow detection DETAILED DESCRIPTION

[0012] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0013] refer to Figure 1The online monitoring and control system for ammonia nitrogen in the ammonia distillation section of the present invention includes a detection system, a data processing system and a control system. The detection system detects the main process parameters of the ammonia distillation section, including: effluent water quality detection ④, including but not limited to the detection of ammonium ions, sulfate ions, hydrogen ions, sulfide ions, thiocyanate ions, cyanide, organic acids and other indicators in the water; temperature detection Ⅰ⑤, temperature detection Ⅱ⑥, temperature detection Ⅲ⑦ are respectively the measurement of the temperature of different areas in the ammonia distillation tower; inlet water quality detection ⑧, also to detect the inlet water ammonium ions, sulfate ions, hydrogen ions, sulfide ions, thiocyanate ions, cyanide, organic acids and other indicators; pressure detection ⑩, to detect the pressure in the ammonia distillation tower; ammonia recovery flow detection, to detect the ammonia evaporation recovery amount. The data processing system includes an input end and an output end. The input end is connected to the outlet water quality detection ④, temperature detection Ⅰ⑤, temperature detection Ⅱ⑥, temperature detection Ⅲ⑦, inlet water quality detection ⑧, pressure detection ⑩, and ammonia recovery flow detection; the basic data of each detection unit in the detection system is imported from the input end, and after analysis, correction, and optimization by the data processing system, the output end issues instructions to the control system. The output end is used to execute alkali solution flow control ①, the amount and flow rate of alkali solution added, steam flow control ② the amount and flow rate of added, outlet water flow regulation ③ inlet water flow regulation ⑨ to achieve the purpose of accurately controlling process technical parameters, improving efficiency, and reducing costs.

Claims

1. An online monitoring and control system and method for ammonia nitrogen in an ammonia distillation section, characterized in that: It includes detection system, data processing system and control system. The detection system detects the main process parameters of the ammonia distillation section, including: effluent water quality detection ④, temperature detection Ⅰ⑤, temperature detection Ⅱ⑥, temperature detection Ⅲ⑦, inlet water quality detection ⑧, pressure detection ⑩, and ammonia recovery flow detection. The data processing system includes input and output ends. The input end is connected to effluent water quality detection ④, temperature detection Ⅰ⑤, temperature detection Ⅱ⑥, temperature detection Ⅲ⑦, inlet water quality detection ⑧, pressure detection ⑩, and ammonia recovery flow detection; the output end is connected to alkali liquid flow control ①, steam flow control ②, effluent flow regulation ③, and inlet flow regulation ⑨. The control system includes: alkali liquid flow control ①, steam flow control ②, effluent flow regulation ③, and inlet flow regulation ⑨.

2. The effluent water quality detection and influent water quality detection described in claim 1 include but are not limited to the detection of indicators such as ammonium ions, sulfate ions, hydrogen ions, sulfide ions, thiocyanate ions, cyanide, organic acids, etc. in the water.

3. The online monitoring and control system and method for ammonia nitrogen in an ammonia distillation section according to claim 1 comprises the following steps: Basic data is obtained through various detection units in the detection system, such as effluent water quality detection ④, temperature detection Ⅰ⑤, temperature detection Ⅱ⑥, temperature detection Ⅲ⑦, inlet water quality detection ⑧, pressure detection ⑩, and ammonia recovery flow detection. Then the data is imported into the data processing system from the input end, and after analysis, correction and optimization by the data processing system, the command is issued to the control system from the output end. Finally, the alkali liquid flow control ①, steam flow control ②, effluent flow regulation ③, and inlet flow regulation ⑨ units accurately control the process technical parameters to achieve the purpose of optimized control.

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