A steam power source water vapor anti-corrosion, anti-scaling and anti-salt deposition control system and method

Abstract

The present invention discloses a steam power source water vapor anti-corrosion, anti-scaling and anti-salt deposition control system and method, including a PLC control system, an intelligent water supply and strong alkali addition system, a steam power source water supply pH and flow online database system. The PLC control system is electrically connected to the intelligent water supply and strong alkali addition system, and the intelligent water supply and strong alkali addition system is electrically connected to the PLC control system and the flow online database system respectively. The steam power source water supply pH and flow online database system is electrically connected to the PLC control system. By utilizing the principle of complete ionization of strong alkaline electrolytes in water treatment, the online monitoring of various water and steam indexes under the condition of strong alkali treatment will be more stable and accurate, realizing the precise adjustment and control of key indexes. Through the principle of complete ionization of strong alkali, the addition of strong alkali to the water supply and the timely adjustment according to the change of system operation load are more precise and intelligent, realizing the solution to the industrial problems of anti-corrosion, anti-scaling and anti-salt deposition in the water vapor system of steam power sources.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial production and processing control, and particularly relates to a steam power source water and steam anti-corrosion, anti-scaling and anti-salt deposition control system and method. Background Art

[0002] Steam power sources generally indirectly heat water by means such as coal combustion, nuclear fuel energy release, waste incineration, fuel oil, etc., so that the water is converted into steam for use in steam engines to do work, and the linkage generator is converted into electric energy to complete the conversion of thermal energy - mechanical energy - electric energy; the steam or drives the rotating machine to drive the linkage part to directly do work to complete the conversion of thermal energy and mechanical energy. During the process of water heating and pressurization, a common problem in the world industry has arisen, that is, the oxidative corrosion of the inner wall of metal pipes by high-temperature and high-pressure water and steam, and the deposition and scaling of its corrosion products along with the water and steam cycle, the proliferation of oxide scales leading to pipe bursts and salt deposition in steam turbines and other serious problems. In the traditional process of adding drugs to feed water and boiler water, the water and steam indexes and the measures for feed water anti-corrosion are independent of each other, and there is no interlocking mechanism. The manual preparation of feed water drugs cannot achieve precision and full automation. The on-line monitoring indexes of feed water, boiler water and steam only serve as the basis for on-site monitoring by operators and do not participate in the intelligent feed water treatment adjustment and control, resulting in serious waste of resources. Summary of the Invention

[0003] In order to solve the above problems, the present invention designs a steam power source water and steam anti-corrosion, anti-scaling and anti-salt deposition control system and method.

[0004] In order to solve the above technical problems and achieve the above technical effects, the present invention is realized through the following technical content:

[0005] A steam power source water and steam anti-corrosion, anti-scaling and anti-salt deposition control system and method, including a PLC control system, an intelligent feed water and strong alkali system, an on-line database system for the pH and flow rate of steam power source feed water; the output end of the PLC control system is electrically connected to the input end of the intelligent feed water and strong alkali system, the output end of the intelligent feed water and strong alkali system is respectively electrically connected to the input ends of the PLC control system and the on-line database system for the pH and flow rate of steam power source feed water, and the output end of the on-line database system for the pH and flow rate of steam power source feed water is electrically connected to the input end of the PLC control system;

[0006] The PLC control system includes a PLC calculation module and a control module; the intelligent feed water and strong alkali system includes a conductivity monitoring module, a feed water and strong alkali addition module, a communication port, and an Ethernet interface; the on-line database system for the pH and flow rate of steam power source feed water includes an on-line database module, a data retrieval module, and a data transmission module.

[0007] Further, the communication port is an RS485 port supporting the modbus rtu communication protocol.

[0008] Further, the Ethernet interface supports industrial Ethernet communication protocols such as PROFINET, TCP, UDP, and Modbus TCP.

[0009] Further, the conductivity within the strong alkali addition module of the intelligent water supply system is controlled between 2.5 mS / cm and 3.5 mS / cm, and the pH value of the feed water is controlled between 9.0 and 9.6.

[0010] A method for controlling steam corrosion, scale, and salt deposition in a steam power source water-vapor system is implemented based on a steam power source water-vapor corrosion, scale, and salt deposition control system, and includes the following steps:

[0011] The intelligent water supply strong alkali system monitors the conductivity data of the special strong alkali for anti-corrosion, anti-scale, and anti-salt deposition of the feed water and feeds it back to the PLC control system for caching;

[0012] The intelligent water supply strong alkali system feeds back the feed water alkali addition data to the steam power source feed water pH and flow online database system for data recording;

[0013] The steam power source feed water pH and flow online database system receives the feed water alkali addition data from the intelligent water supply strong alkali system, matches the optimal pH value and flow value data corresponding to the feed water alkali addition value in the database, and feeds back the matched data to the PLC control system.

[0014] The PLC control system calculates the dosing amount data according to the linear characteristic of the pH value and conductivity to control the optimal feed water strong alkali amount of the intelligent water supply strong alkali system.

[0015] The dosing automatic control logic of the PLC control system adopts the principle of complete ionization of strong alkaline electrolytes, NaOH = Na + + OH - , and its pH value and conductivity show a linear characteristic.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] (1) The present invention efficiently utilizes the original online monitoring system and data of the steam power source water-vapor, participates in the key anti-corrosion, anti-scale, and anti-salt deposition key feed water strong alkali intelligent adjustment and control, and leads industrial production to be more intelligent, high-precision, and fully automated.

[0018] (2) By using the principle of complete ionization of strong alkaline electrolytes in feed water treatment (NaOH = Na + + OH - ), compared with the original treatment of using weak alkali ammonia in feed water, when the water-vapor index is affected by temperature change, its pH value and conductivity are severely affected. Under the condition of strong alkali treatment, the online monitoring of each water and vapor index will be more stable and accurate.

[0019] (3) By utilizing the principle of complete ionization of strong alkaline electrolytes (NaOH = Na + + + OH - -), whose pH value and conductivity exhibit a linear characteristic, the conductivity index is involved in the key indicators for anti-corrosion, anti-scaling, and anti-salt deposition in the water-vapor system, enabling precise adjustment and control between the pH values of the feed water and the boiler.

[0020] (4) Through the principle of complete ionization of strong alkalis, adding strong alkalis to the feed water and timely regulating according to the change of the system operation load are more precise and intelligent, achieving the solution to the problems of anti-corrosion, anti-scaling, and anti-salt deposition in the water-vapor system of steam power sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic diagram of the principle of the water-vapor anti-corrosion, anti-scaling, and anti-salt deposition control system for steam power sources. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present invention will be further described below in conjunction with the embodiments, but the present invention is not limited in any way. Any transformation or substitution based on the teachings of the present invention falls within the protection scope of the present invention. Embodiment

[0024] Refer to Figure 1As shown in the figure, a steam power source water vapor anti-corrosion, anti-scaling and anti-salt accumulation control system and method include a PLC control system, an intelligent water supply strong alkali system, a steam power source water supply pH and flow online database system; the output end of the PLC control system is electrically connected to the input end of the intelligent water supply strong alkali system, and can control the optimal water supply strong alkali amount of the intelligent water supply strong alkali system according to the matching of pH value and conductivity linear characteristic data; the output end of the intelligent water supply strong alkali system is electrically connected to the input ends of the PLC control system and the flow online database system respectively, and the conductivity data is monitored by the intelligent water supply strong alkali system and fed back to the PLC control system for caching, and uploaded to the steam power source water supply pH and flow online database system for data recording; the output end of the steam power source water supply pH and flow online database system is electrically connected to the input end of the PLC control system, and can match the optimal pH value and flow value data corresponding to the water supply alkali addition value in the database, and feed the matching data back to the PLC control system; the PLC control system includes a PLC calculation module and a control module; the intelligent water supply strong alkali system includes a conductivity monitoring module, a pH monitoring module, a water supply strong alkali module, a communication port and an Ethernet interface, the conductivity in the water supply strong alkali module of the intelligent water supply strong alkali system is controlled between 2.5 mS / cm and 3.5 mS / cm, and the water supply pH value is controlled between 9.0 and 9.6; the steam power source water supply pH and flow online database system includes an online database module, a data retrieval module and a data transmission module, the communication port is an RS485 port supporting the modbus rtu communication protocol, and the Ethernet interface supports industrial Ethernet communication protocols such as PROFINET, TCP, UDP, and Modbus TCP, and can realize the transmission and exchange of system monitoring data such as the water supply pH value between the special strong alkali dosing device for water vapor anti-corrosion, anti-scaling and anti-salt accumulation of the enterprise steam power source and the water vapor system.

[0025] Specific application when the present invention is used:

[0026] During specific application, the conductivity monitoring module of the intelligent water supply strong alkali system monitors the conductivity data of the special strong alkali for water vapor anti-corrosion, anti-scaling and anti-salt accumulation of the water supply and feeds it back to the PLC control system for caching. At the same time, the water supply alkali addition data is uploaded to the steam power source water supply pH and flow online database system in the cloud through the communication port or Ethernet interface, and data recording is carried out through the online database module. The data retrieval module of the steam power source water supply pH and flow online database system matches the optimal pH value and flow value data corresponding to the water supply alkali addition value in the database, and feeds the matching data back to the PLC calculation module of the PLC control system through the data transmission module. The PLC calculation module calculates the dosing amount data according to the linear characteristic of the pH value and conductivity, and controls the optimal water supply strong alkali amount of the intelligent water supply strong alkali system through the control module.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steam power source water vapor anti-corrosion, anti-scaling and anti-salt deposition control system, characterized in that: It includes a PLC control system, an intelligent water supply strong alkali system, an online database system for the pH value and flow rate of the steam power source water supply; the output end of the PLC control system is electrically connected to the input end of the intelligent water supply strong alkali system, the output end of the intelligent water supply strong alkali system is respectively electrically connected to the input ends of the PLC control system and the online database system for the pH value and flow rate of the steam power source water supply, and the output end of the online database system for the pH value and flow rate of the steam power source water supply is electrically connected to the input end of the PLC control system; The PLC control system includes a PLC calculation module and a control module; the intelligent water supply strong alkali system includes a conductivity monitoring module, a water supply strong alkali addition module, a communication port, and an Ethernet interface; The conductivity in the water supply strong alkali addition module of the intelligent water supply strong alkali system is controlled between 2.5 mS / cm and 3.5 mS / cm, and the water supply pH value is controlled between 9.0 and 9.6; The online database system for the pH value and flow rate of the steam power source water supply includes an online database module, a data retrieval module, and a data transmission module; The system is used to execute the following control methods: a. The intelligent water supply strong alkali system monitors the conductivity data of the special strong alkali for anti-corrosion, anti-scaling, and anti-salt accumulation in the water supply and feeds it back to the PLC control system for caching; b. The intelligent water supply strong alkali system feeds back the water supply alkali addition data to the online database system for the pH value and flow rate of the steam power source water supply for data recording; c. The online database system for the pH value and flow rate of the steam power source water supply receives the water supply alkali addition data from the intelligent water supply strong alkali system and matches the optimal pH value and flow rate data corresponding to the water supply alkali addition value in the database, and feeds back the matching data to the PLC control system; d. The PLC control system calculates the dosage data based on the linear characteristics of pH value and conductivity to control the optimal water supply and alkali dosage of the intelligent water supply and alkali enhancement system; the dosing automatic control logic of the PLC control system adopts the principle of complete ionization of strong alkaline electrolyte NaOH=Na + +OH - , its pH value and conductivity show a linear characteristic.

2. The steam power source water vapor anti-corrosion, anti-scale and anti-salt deposition control system according to claim 1, characterized in that: The communication port is an RS485 port and supports the modbus rtu communication protocol.

3. The steam power source water vapor anti-corrosion, anti-scale and anti-salt deposition control system according to claim 1, characterized in that: The Ethernet interface supports industrial Ethernet communication protocols such as PROFINET, TCP, UDP, and Modbus TCP.

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