Energy-saving and water-saving device for distributed control over industrial circulating water and control method thereof

Abstract

An energy-saving and water-saving device for distributed control over industrial circulating water comprises an operating system, a central computing control system, a PID control system, an on-site execution system I, an on-site execution system II and an on-site instrument system. Detection instruments of the on-site instrument system are distributed at corresponding detection sites in pipelines and circuits of a soft water closed circulation system and corresponding detection sites in pipelines and circuits of a purified water circulation system. In a method for achieving distributed control over the industrial circulating water through the device, based on the principle of centralized management and distributed control, the central computing control system issues an execution instruction to the on-site execution system I and the on-site execution system II according to parameters set by the operating system, meanwhile constantly carries out computation, analysis and comparison on data fed back by the on-site instrument system and the on-site execution system II and a set value, and gives an adjustment and correction instruction so as to guarantee normal operation of the water circulation systems and achieve efficient integration of industrialization and informationalization. The device is completely intelligent, high in automation degree, easy and convenient to operate, efficient, safe, reliable and low in environmental pollution and saves energy and water.

Description

technical field [0001] The invention relates to an energy-saving and water-saving control device and a control method, in particular to an energy-saving and water-saving device and a control method for a distributed control system of industrial cooling circulating water. Background technique [0002] In the process of industrial production, especially in steel, petroleum refining, chemical industry and other industries, the industrial circulating water (cooling circulating water) system as an auxiliary system plays an important role in the protection of process equipment and stable production. The industrial circulating water system mainly includes Soft water (or pure water) closed circulation system, clean water circulation system: [0003] The soft water closed circulation system is responsible for cooling the more important process equipment. In the soft water closed circulation system, the soft water pump transports the soft water to the process equipment to be cooled fo...

AI Technical Summary

Problems solved by technology

[0006]1. The soft water circulation system and the clean water circulation system have a wide range of points. There are many return water cooling equipment such as water pumps, water inlet and outlet valves, cooling towers, and coolers (heat exchangers). The existing control devices are only centralized. Surveillance and some simple remote control also require manual on-site start-stop and conversion. There is no interlocking automatic control function between equipment, slow response, and many human factors, leaving safety hazards for the protection of equipment (especially some important equipment). ;

[0007]2. The existing control device lacks the detection of the return water temperature and the change of atmospheric temperature and humidity, and cannot timely adjust the number of water pumps and valve openings, the number and speed of cooling towers and air cooler fans, and the evaporation and drift of water are too large. Excessive consumption;

[0008]3. In order to ensure safety, the entire system basically adopts the operation mode of large flow rate and low temperature rise (due to safety requirements, manufacturers should reserve 20%-50% safety margin in the design), and these margins are in normal production. If it is not used, it is only needed in the event of an accident such as a sudden leakage of the pipeline, which causes a lot of waste of electric energy during normal operation;

[0009]4. Some cooling circulating water systems adopt the operation mode of more than two pump sets, and the outlet water flow depends on the adjustment of the opening of the outlet valve, and the flow and pressure between the pump sets are inconsistent; some sets of water pump sets are responsible for the cooling of process equipment in multiple areas. There is no heat load feedback adjustment information and means for each process equipment point, the water pump group cannot adjust the optimal water consumption of each process equipment according to the actual load situation, and there is no automatic adjustment means for the water flow and pressure of the water pump, resulting in a lot of waste of water resources

Images