Automatic regulation and control system for water temperature balance of steelmaking water system

Abstract

The utility model discloses an automatic regulation and control system for water temperature balance of a steelmaking water system, which belongs to the field of automation control and comprises a control unit, and a water supply pool, a steelmaking production line water network and a cooling tower group which are connected in sequence, the water supply pool is provided with a water replenishing valve, a thermometer and a liquid level meter; the cooling tower group comprises a plurality of cooling towers; and the control unit comprises a PLC (Programmable Logic Controller) and an upper computer which are in data signal connection. Compared with the prior art, the system has the characteristics of balanced and stable water temperature and less manual intervention.

Description

Technical Field

[0001] The utility model relates to an automatic control method, in particular to an automatic water temperature balance control system suitable for a steelmaking water system. Background Art

[0002] The steelmaking water system provides process water for the steelmaking production line. The process has certain requirements for water temperature. Too high or too low temperature will affect the quality of the steel billet. The water in the water system is circulated and the return water temperature is relatively high. The water is cooled by the cooling tower and stored in the water supply pool to supply water for multiple production lines. When the heat generated by the production process, the ambient temperature and the heat dissipation of the cooling tower reach a certain balance, the water temperature will be balanced at a certain temperature value.

[0003] In order to reduce human errors, most of the control in this field is done by subsystem or multi-system. For example, "A Combined High-Purity Cooling Circulating Water System" (CN201510562501.3) controls the system return water temperature through a high-purity water cooling circulating water system, a regulating cooling circulating water system, an auxiliary regulating cooling circulating water system and a water supply system. "A VOD Furnace Steelmaking Cooling Water Circulation System" (CN202311190788.2) adopts a VOD desalted water circulating water system, a VOD turbid circulating water system and a spray clean circulating water system, and uses a semi-closed system for partial circulation. The above systems have complex structures and low water recycling utilization.

[0004] Therefore, there is an urgent need for a relatively simple system that is suitable for automatic control of water temperature balance in steelmaking water systems to ensure stable water temperature balance. Utility Model Content

[0005] The technical task of the utility model is to provide a water temperature balance automatic control system for a steelmaking water system in view of the deficiencies of the above existing technologies, so as to ensure the stable balance of water temperature, reduce manual intervention and save manpower.

[0006] The utility model solves the technical problem through a technical solution: a water temperature balance automatic control system for a steelmaking water system, characterized in that it comprises a control unit, and a water supply tank, a steelmaking production line water network, and a cooling tower group connected in sequence; the water supply tank is provided with a water supply valve, a thermometer, and a liquid level gauge; the cooling tower group comprises a plurality of cooling towers, each of which has a separate cooling tower fan, and each cooling tower fan has a separate control switch; the control unit comprises a PLC controller and a host computer connected with data signals; the water supply valve, the thermometer, the liquid level gauge, and the control switches of the cooling tower fans are respectively connected with the data signals of the PLC controller.

[0007] The optimization solution also includes filters.

[0008] Furthermore, the above-mentioned filter is located between the water supply tank and the water network of the steelmaking production line.

[0009] Compared with the prior art, the utility model has the following outstanding beneficial effects:

[0010] 1. The utility model system automatically adjusts the water supply temperature according to the process requirements, realizes the water temperature balance of the steelmaking water system, reduces the problem of scrap steel caused by too high or too low water temperature, and provides guarantee for the stable quality of steelmaking process;

[0011] 2. The utility model system does not require personnel to pay attention to the temperature changes of the water supply pool in real time to manually start and stop the cooling tower fan, which reduces the workload of operators and saves manpower;

[0012] 3. The application scope of the utility model is not limited to the steelmaking water system, but can be applied to various process water systems for cooling towers. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a hardware flow chart of the utility model.

[0014] Figure 2 It is a schematic diagram of data transmission relationship of the control unit of the utility model.

[0015] Figure 3 It is the upper computer screen of the utility model. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments of the specification. In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0017] In the following embodiments, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model application can be understood according to the specific circumstances.

[0018] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", "end", "side" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the utility model application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the utility model application.

[0019] The utility model is a The system for automatic temperature balance control of steelmaking water system, such as Figure 1 , 2 Shown, including control unit, and Sequentially connected Water supply pool 1, steel production line water network 6, cooling tower group 7. The water supply pool 1, steel production line water network 6, cooling tower group 7 form a closed loop circulation through pipelines.

[0020] The water supply tank 1 is provided with a water supply valve 2, a thermometer 3 and a liquid level meter 4. The thermometer 3 and the liquid level meter 4 are used for temperature and liquid level monitoring, and the water supply valve 2 is responsible for water supply.

[0021] The filter 5 is located between the water supply pool 1 and the steel production line water network 6, and is used to filter the circulating water in the system.

[0022] The cooling tower group 7 includes a plurality of cooling towers, each of which has a separate cooling tower fan, and each cooling tower fan has a separate control switch.

[0023] The control unit includes a PLC controller and a host computer connected by data signals. The water supply valve 2, the thermometer 3, the liquid level meter 4, and the control switches of the cooling tower fans are respectively connected to the PLC controller data signals. When in use, the control signal of the water supply tank 1 water supply valve 2, the liquid level and temperature detection signal, and the control signal of the cooling tower fans of the cooling tower group 7 are connected to the PLC controller. After data and signal processing, the PLC controller controls the water supply valve 2 and the cooling tower fans, and displays them on the host computer.

[0024] The circulating water is filtered by the filter 5 from the water supply tank 1 and then transported to the steel production line 6 as cooling water for the process and equipment. After passing through the steel production line, the circulating water takes away part of the temperature to play a cooling role. At the same time, the circulating water temperature rises and returns to the water supply tank 1 after being cooled by the cooling tower group 7. The cooling tower group 7 is composed of a certain number of cooling towers (in this embodiment, 9 cooling towers). The water supply tank 1 is equipped with a thermometer 3 and a liquid level meter 4 for temperature and liquid level detection. According to the difference between the actual detected temperature value of the water supply tank 1 and the temperature value required by the process, different numbers of cooling tower fans need to be turned on to ensure that the actual detected temperature is close to the required temperature. Due to the loss of water during the circulation process, the liquid level is detected according to the liquid level meter 4. When the low value is reached, the water supply valve 2 is automatically opened to replenish water. When the high value is reached, the water supply valve 2 is automatically closed to stop replenishing water to maintain the liquid level of the water supply tank 1 within a certain range.

[0025] The utility model discloses a system which automatically adjusts the water supply temperature according to the process requirements, realizes the water temperature balance of the steelmaking water system, reduces the scrap steel problem caused by too high or too low water temperature, and provides guarantee for the stable quality of the steelmaking process. It does not require personnel to pay attention to the temperature changes of the water supply pool in real time to manually start and stop the cooling tower fan, thus reducing the workload of operators and saving manpower.

[0026] Figure 3 It is the host computer screen. The host computer is connected to the PLC, the PLC data is displayed on the host computer screen, and the operator's parameter settings and operation requirements are transmitted to the PLC to achieve human-computer friendly interaction.

[0027] In this embodiment, the display interface is:

[0028] The first grid: "Actual temperature of water supply pool" is PT, which displays the temperature of water supply pool in real time;

[0029] The second grid: "Process required temperature upper limit" or HT, "Process required temperature lower limit" or LT, set according to process requirements; "Single cooling tower cooling value" or △T, when other conditions remain unchanged, each time a cooling tower fan is turned on or off, the water supply pool temperature change value comes from actual production statistical data. When △T changes greatly between different seasons, such as summer and winter, it can be modified. If the change does not exceed 10%, no modification is required;

[0030] The third grid: "Number to be turned on" is PN, and "Number in operation" is SN, which are used to display the number of cooling tower fans that should be turned on and the number of cooling tower fans actually in operation after being processed by the PLC program; 9 circles are used to display the operating status of 1-9# cooling tower fans, red for stopped and green for running.

[0031] When in use, the operator inputs the upper and lower temperature limits required by the process on the host computer screen, and the PLC controls the start and stop of the cooling tower fan, automatically adjusting the actual temperature of the water supply pool between the upper and lower temperature limits required by the process, thereby achieving automatic control of temperature balance.

[0032] In this embodiment, 9 cooling tower fans are taken as an example. In practice, an indefinite number of cooling towers can be equipped according to site needs. The more cooling towers there are, the better the temperature control effect. Moreover, the scope of application of the utility model is not limited to the steelmaking water system, but can be applied to various process water systems where cooling towers are used for cooling.

[0033] It should be noted that the specific embodiments of the present invention have been described in detail. For those skilled in the art, various obvious changes to the present invention without departing from the spirit and scope of the present invention are within the protection scope of the present invention.

Claims

1. A water temperature balance automatic control system for a steelmaking water system, characterized by: It includes a control unit, and a water supply tank, a steel production line water network, and a cooling tower group connected in sequence; The water supply tank is provided with a water supply valve, a thermometer and a liquid level gauge; The cooling tower group includes a plurality of cooling towers, each cooling tower has a separate cooling tower fan, and each cooling tower fan has a separate control switch; The control unit includes a PLC controller and a host computer connected by data signals; the water supply valve, thermometer, liquid level gauge, and each cooling tower fan control switch are respectively connected to the PLC controller data signal.

2. The automatic temperature balance control system for steelmaking water system according to claim 1 is characterized by: Also includes filters.

3. The automatic control system for water temperature balance of steelmaking water system according to claim 2 is characterized by: The filter is located between the water supply tank and the water network of the steelmaking production line.

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