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CN-117534187-B - Water plant automatic chlorination process optimization method, device and storage medium

CN117534187BCN 117534187 BCN117534187 BCN 117534187BCN-117534187-B

Abstract

The invention relates to the technical field of water treatment, in particular to a method and a device for optimizing an automatic chlorination process of a water plant and a storage medium. The method comprises the steps of reading free chlorine content, monochloramine content and free ammonia content from clarified water flow data and filtered water flow data, automatically adjusting the front chlorine adding amount according to the front chlorine adding flow adding ratio, a free chlorine target value and the free chlorine content, calculating and automatically adjusting the current rear chlorine adding amount according to the rear chlorine adding flow adding ratio, a factory monochloramine target value and the monochloramine content, and calculating and automatically adjusting the current rear ammonia adding amount according to the rear ammonia adding flow adding ratio, the factory free ammonia target value and the free ammonia content until the free chlorine content, the monochloramine content and the monochloramine content meet factory requirements. Compared with the prior art, the invention has the advantages of automatically controlling the chlorine adding and ammonia adding amount of the whole disinfection process completely according to the target value of the monochloramine and the free ammonia of the factory water and the water inlet flow of the dosing point, improving the disinfection quality of the factory water and the like.

Inventors

  • DONG LIANG
  • SHI TIANYI

Assignees

  • 上海远动科技有限公司

Dates

Publication Date
20260512
Application Date
20231220

Claims (7)

  1. 1. An optimization method of an automatic chlorination process of a water plant is characterized by comprising the following steps that a clarification tank is sequentially connected with a filter tank, a chlorination point is arranged in front of the clarification tank, a chlorination point and an ammonia point are arranged behind the filter tank, Obtaining clarified water flow data and filtered water flow data, reading free chlorine content from the clarified water flow data, and reading monochloramine content and free ammonia content from the filtered water flow data; adjusting the pre-chlorine adding amount according to the pre-chlorine adding flow adding ratio, the free chlorine target value and the current free chlorine content, judging whether the free chlorine content is within the free chlorine target value range, if so, outputting the pre-chlorine adding amount, otherwise, readjusting the pre-chlorine adding amount; Calculating the current post-chlorination amount according to the post-chlorination flow addition ratio, the factory monochloramine target value and the current monochloramine content, judging whether the monochloramine content is within the factory monochloramine target value range, if so, outputting the post-chlorination amount, otherwise, readjusting the post-chlorination amount; calculating the current post-ammonia adding amount according to the post-ammonia adding flow adding ratio, a factory free ammonia target value and the current free ammonia content, judging whether the free ammonia content is in the factory free ammonia target value range, if so, outputting the post-ammonia adding amount, otherwise, readjusting the post-ammonia adding amount; wherein the pre-chlorine adding flow adding ratio, the post-ammonia adding flow adding ratio, the free chlorine target value, the factory monochloramine target value and the factory free ammonia target value are all preset; the target value of the free chlorine is in the range of 0.3-0.5 mg/L, the target value of the factory monochloramine is in the range of 1.0-1.5 mg/L, and the target value of the factory free ammonia is in the range of 0.1-0.15 mg/L.
  2. 2. The method for optimizing an automatic chlorination process of a water mill according to claim 1, wherein before obtaining the clarified water flow data and the filtered water flow data, pre-chlorination, post-chlorination and post-chlorination are performed according to an initial pre-chlorination amount, an initial post-chlorination amount and an initial post-chlorination amount, respectively.
  3. 3. The optimization method of automatic chlorination process of water works according to claim 2, wherein when ammonia nitrogen in clarified water is zero and factory water is chloramine for disinfection, the initial post-ammonia addition amount is calculated according to the factory monochloramine target value, and the initial post-ammonia addition amount is in direct proportion to the factory monochloramine target value.
  4. 4. The method according to claim 2, wherein the initial post-chlorination amount is calculated based on a difference between the factory monochloramine target value and the free chlorine content.
  5. 5. The method for optimizing an automatic chlorination process of a water works according to claim 1, wherein the pre-chlorination amount is less than 2.3 mg/L.
  6. 6. An automatic chlorination process optimizing device for a water plant, comprising a memory, a processor, and a program stored in the memory, wherein the processor implements the method of any one of claims 1-5 when executing the program.
  7. 7. A storage medium having a program stored thereon, wherein the program, when executed, implements the method of any of claims 1-5.

Description

Water plant automatic chlorination process optimization method, device and storage medium Technical Field The invention relates to the technical field of water treatment, in particular to a method and a device for optimizing an automatic chlorination process of a water plant and a storage medium. Background Along with the implementation of new edition 'sanitary Standard for Drinking Water', the conventional index of disinfectant in drinking water is increased from 1 item (free chlorine) to 4 items, and monochloramine, ozone and chlorine dioxide are added. And the unconventional indexes such as ammonia nitrogen, chloromethane and the like which are disinfection byproducts are increased, the limit values of part of projects are stricter, and the disinfection process and the chlorination method of water supply enterprises need to be adjusted and optimized. In tap water disinfection, disinfection in the form of free chlorine or total chlorine (chloramine) is commonly used. Total chlorine and free chlorine are easily analyzed, whether in an on-line chlorine residual meter or in a laboratory, but monochloramine cannot be identified. The total chlorine in the new disinfectant is monochloramine, so that the adding ratio of the chlorine to the ammonia is required to be reasonably controlled to be 3.5-5:1. At present, free ammonia is used for adjusting the chlorine/ammonia adding ratio in fewer domestic water plants, namely, a small amount of free ammonia is required to be maintained in water so as to ensure that residual chlorine generated in the water is monochloramine. Free ammonia is NH 3/NH4+ in water that can bind to chlorine. When the ammonia chloride adding ratio is more than 5:1, the free ammonia is close to zero, so that part of monochloramine is converted into dichloramine, the tap water has bad smell and bad taste, when the ammonia adding amount is excessive, the water temperature is more than 15 degrees especially in summer, part of free ammonia is converted into nitrite, the nitrite concentration is increased, and the monochloramine is reduced. In severe cases, the retention time of the water in a pipe network (a pump station reservoir) is too long, residual chlorine is low or is close to zero, and potential risks are formed for water supply safety. In the existing automatic chlorine adding and ammonia adding process flow of the water plant, the automatic adding control mode is that the front chlorine adding/back chlorine adding/ammonia adding refers to the raw water inflow flow, the chlorine adding and ammonia adding amount is automatically controlled by manually setting the flow adding ratio, the chlorine adding/ammonia adding ratio is manually adjusted according to the free chlorine of the precipitated water and the total chlorine after filtering, but staff on duty cannot correctly and reasonably adjust the adding ratio according to the change of monochloramine and free ammonia, the automatic chlorine adding operation condition is that the front chlorine adding is three sodium hypochlorite metering pumps (350L/h), the back chlorine adding is three sodium hypochlorite metering pumps (150L/h), the back ammonia adding is newly modified (20L/h) ammonium sulfate metering pumps, and the three automatic chlorine adding operation modes are two-in-one. Free chlorine (HClO) generated by adding chlorine at the break point is used as a main disinfectant, ammonia is added after filtering to supplement chlorine, and factory water is sterilized by monochloramine (NH 2 Cl). In the process flow, the break point chlorine adding can automatically add chlorine by the flow adding ratio and the free chlorine feedback, but for chloramine disinfection, the existing automatic chlorine adding has the problems that firstly, operators are unclear how to reasonably control the chlorine ammonia adding ratio according to the target value of residual chlorine leaving a factory, secondly, according to the total chlorine feedback, the free ammonia limit value is not considered, safety measures for preventing dichloramine and ensuring the biological stability of drinking water are not provided, so that the residual chlorine stability is low, the safety is not high, and the automatic chlorine adding control is difficult to be truly applied to a water works. The above problems are also a bottleneck which plagues and restricts the domestic automatic chlorine addition for a long time. Therefore, how to reasonably control the chlorine adding ratio according to the target value of residual chlorine from the factory and consider the limit value of free ammonia, and improve the accuracy, reliability and safety of automatic chlorine adding control becomes a problem to be solved in the field. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a method, a device and a storage medium for optimizing the automatic chlorination process of a water plant, the method adopts a computer program to automaticall