Water quality management device, water treatment system, water quality management method, and program for optimizing water treatment system

• US 10,640,392 B2
• Filed: 06/27/2016
• Issued: 05/05/2020
• Est. Priority Date: 09/18/2015
• Status: Active Grant

• Current Assignee: Mitsubishi Power Limited (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: mitsubishi hitachi power systems, ltd. (Mitsubishi Heavy Industries, Ltd.)
• Inventors: Fujioka, Masanori, Tanaka, Toru, Hamasaki, Akihiro, Sugimoto, Atsushi, Saito, Mayumi, Hamaji, Yoshiyuki
• Primary Examiner(s): Drodge, Joseph W
• Application Number:
  US15/758,860
• Publication Number:
  US 20180282180A1
• Time in Patent Office: 1,408 Days
• Field of Search: 210696, 210739, 210749, 210752, 210 85, 210 961, 210143, 2101981, 210199, 137 2, 137 3, 137 5, 137 88, 137 93, 700 28, 700 44, 700 46, 700 47, 700266, 700273, 700276, 700282, 700285, 3661511, 3661521
• CPC Class Codes: C02F 1/008 Control or steering systems not provided for elsewhere in subclass C02F
• CPC Class Codes: C02F 1/66 by neutralisation; pH adjustment for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58
• CPC Class Codes: C02F 1/685 Devices for dosing the additives
• CPC Class Codes: C02F 1/686 Devices for dosing liquid additives
• CPC Class Codes: C02F 2103/023 Water in cooling circuits
• CPC Class Codes: C02F 2209/006 comprising a software program or a logic diagram
• CPC Class Codes: C02F 2209/40 Liquid flow rate
• CPC Class Codes: C02F 2301/04 Flow arrangements
• CPC Class Codes: C02F 2303/08 Corrosion inhibition
• CPC Class Codes: C02F 2303/20 Prevention of biofouling
• CPC Class Codes: C02F 2303/22 Eliminating or preventing deposits, scale removal, scale prevention C02F1/042, C02F1/4602, C02F5/00 take precedence
• CPC Class Codes: C02F 5/08 Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
• CPC Class Codes: F22D 11/00 Feed-water supply not provided for in other main groups
• CPC Class Codes: F22D 11/006 Arrangements of feedwater cleaning with a boiler
• CPC Class Codes: F22D 11/02 Arrangements of feed-water pumps F22D11/06 takes precedence; pumps per se F04
• CPC Class Codes: F28G 13/00 Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00
• CPC Class Codes: G05B 13/0265 the criterion being a learning criterion

Abstract

A water quality management device is provided with a water quality index value acquisition unit which acquires water quality index values including a makeup water quality index value indicating water quality of makeup water and a circulating water quality index value indicating water quality of circulating water, and a determining unit which determines an amount of concentration control associated with a concentration rate of a circulating water system based on the water quality index values acquired by the water quality index value acquisition unit.

Claims

1. A water quality management system for managing a circulating water system of a plant which includes a circulation line through which circulating water is circulated, a supply line which supplies makeup water to the circulation line, a discharge line which discharges the circulating water from the circulation line, and a chemical injection line which injects a chemical to the circulation line, the water quality management system comprising:

at least one feed pump for supplying water for the circulation water system, at least one valve for draining or blowing down water from the circulating water system, and at least one injection pump for supplying a water treatment chemical to add to the circulating water, and a control system which includes;

a determining unit configured to determine an amount of concentration control, the amount of concentration control being at least one of a concentration rate, an amount of water supply, an amount of drainage water, an amount of chemical injection, an opening of a valve, and power of a pump of the circulating water system;

an acquisition unit configured to acquire plant data on the plant used by the determining unit to determine the amount of concentration control;

a relational storage unit configured to store one or more inference rules concerning a condition of the plant data and a condition of the amount of concentration control when the conditions are satisfied with each other;

an input unit configured to receive an input of an amount of concentration control which satisfies a predetermined limit value and is specified based on the plant data acquired by the acquisition unit;

an updating unit configured to generate a new inference rule based on the amount of concentration control input to the input unit and record the new inference rule at the relational storage unit; and

a controller configured to control, based on the amount of concentration control determined by the determining unit, pumping speed or rate of the at least one feed pump, degree of opening of the at least one valve, and amount of chemical to be injected for the at least one injection pump;

wherein the determining unit determines the amount of concentration control based on the plant data acquired by the acquisition unit and the inference rule stored at the relational storage unit.

2. The water quality management system according to claim 1, wherein

the acquisition unit includes a water quality index value acquisition unit which acquires water quality index values including a makeup water quality index value indicating water quality of the makeup water and a circulating water quality index value indicating water quality of the circulating water, and

the determining unit determines the amount of concentration control based on the water quality index values acquired by the water quality index value acquisition unit.

3. The water quality management system according to claim 2, wherein the water quality index values include a discharge water quality index value indicating water quality of the circulating water discharged from the discharge line.

4. The water quality management system according to claim 1, wherein

the acquisition unit includes an environmental data acquisition unit which acquires environmental data of the plant, and

the determining unit determines the amount of concentration control based on the environmental data acquired by the environmental data acquisition unit.

5. The water quality management system according to claim 1, wherein

the acquisition unit includes an operating data acquisition unit which acquires operating data of the plant, and

the determining unit determines the amount of concentration control based on the operating data acquired by the operating data acquisition unit.

6. A water treatment system comprising:

the water quality management system according to claim 1; and

the circulating water system including the circulation line through which the circulating water is circulated, the supply line which supplies the makeup water to the circulation line, the a discharge line which discharges the circulating water from the circulation line, and the chemical injection line which injects the chemical to the circulation line.

7. A water quality management method of a water quality management system for managing of a circulating water system of a plant which includes a circulation line through which circulating water is circulated, a supply line which supplies makeup water to the circulation line, a discharge line which discharges the circulating water from the circulation line, and a chemical injection line which injects a chemical to the circulation line, the water quality management system comprising at least one feed pump for supplying water for the circulation water system, at least one valve for draining or blowing down water from the circulating water system, and at least one injection pump for supplying a water treatment chemical to add to the circulating water, the water quality management method comprising:

an acquisition step of acquiring plant data on the plant;

an input step of receiving an input of an amount of concentration control which satisfies a predetermined limit value and is specified based on the acquired plant data, the amount of concentration control being at least one of a concentration rate, an amount of water supply, an amount of drainage water, an amount of chemical injection, an opening of a valve, and power of a pump of the circulating water system;

an updating step of generating a new inference rule based on the input amount of concentration control and storing the new inference rule at a relational storage unit which stores one or more inference rules concerning a condition of the plant data and a condition of the amount of concentration control when the conditions are satisfied with each other;

a determination step of determining an amount of concentration control based on the plant data acquired in the acquisition step and the inference rule stored at the relational storage unit, and

a control step of controlling, based on the amount of concentration control determined by the determining step, pumping speed or rate of the at least one feed pump, degree of opening of the at least one valve, and amount of chemical to be injected for the at least one injection pump.

8. A water quality management system for managing a circulating water system of a plant which includes a circulation line through which circulating water is circulated, a supply line which supplies makeup water to the circulation line, a discharge line which discharges the circulating water from the circulation line, and a chemical injection line which injects a chemical to the circulation line, the water quality management system comprising:

at least one feed pump for supplying water for the circulation water system, at least one valve for draining or blowing down water from the circulating water system, and at least one injection pump for supplying a water treatment chemical to add to the circulating water, and a control system which includes;

a relational storage unit configured to store one or more inference rules concerning plant data and an amount of concentration control, the plant data being a plurality of types of variables related to the plant, and the amount of concentration control being at least one of a concentration rate, an amount of water supply, an amount of drainage water, an amount of chemical injection, an opening of a valve, and power of a pump of the circulating water system;

a determining unit configured to determine an amount of concentration control associated with a concentration rate of the circulating water system based on the plant data and the inference rule;

an input unit configured to receive an input of an amount of concentration control which satisfies a predetermined limit value and is specified based on the plant data;

an updating unit configured to generate a new inference rule based on the amount of concentration control input to the input unit and update the inference rule stored at the relational storage unit with the new inference rule; and

a controller configured to control, based on the amount of concentration control determined by the determining unit, pumping speed or rate of the at least one feed pump, degree of opening of the at least one valve, and amount of chemical to be injected for the at least one injection pump.