阅读说明：本技术 不同负荷和供水温度下供需平衡的循环水系统及控制方法 (Circulating water system with balanced supply and demand under different loads and water supply temperatures and control method ) 是由 蔚海建 于 2021-07-05 设计创作，主要内容包括：本发明公开了不同负荷和供水温度下供需平衡的循环水系统及控制方法,通过控制总厂区循环水泵组的频率或改变循环水进每个生产车间流量控制阀的开度来改变循环水流量大小,当温度或压力触发厂区或厂区内该生产车间敏感区的温度或压力保护值后停止减小总厂区循环水泵组的频率或厂区内该生产车间上流量阀门的开度,此时把总厂区或厂区内该生产车间的生产负荷、供水温度、供水流量和循环水泵组的频率或流量阀门开度建立形成一个映射关系存储到第一数据库中,下次获取第一数据库中已存有的生产负荷和供水温度对应下的数据时,直接调取对应的循环水泵组的频率或流量阀门开度即可,快速降低响应时间,使循环水供需用水达到动态平衡,实现节能的目的。(The invention discloses a circulating water system and a control method for supply and demand balance under different loads and water supply temperatures, wherein the flow of circulating water is changed by controlling the frequency of a circulating water pump group in a main plant area or changing the opening degree of a flow control valve of circulating water flowing into each production workshop, when the temperature or pressure triggers the temperature or pressure protection value of a sensitive area of the production workshop in a plant area or the plant area, the frequency of the circulating water pump group in the main plant area or the opening degree of a flow valve on the production workshop in the plant area is stopped to be reduced, at the moment, a mapping relation is established and formed by the production load, the water supply temperature, the water supply flow and the frequency or the opening degree of a flow valve of the circulating water pump group in the main plant area or the plant area, the frequency or the opening degree of the flow valve of the corresponding circulating water pump group is directly taken and stored in a first database when the data corresponding to the production load, the response time is quickly reduced, the supply and demand of circulating water are dynamically balanced, and the aim of saving energy is fulfilled.)

1. A control method of a circulating water system is characterized by comprising the following steps:

setting a temperature protection value and a pressure protection value of a total plant area or each sensitive area of a production workshop in the plant area;

when the controller simultaneously obtains the production load and water supply temperature data of a certain production workshop in the total factory area or the factory area for query, the data of the production load and the water supply temperature of the production workshop in the total factory area or the factory area are taken as indexes, and whether the data of the water supply flow and the frequency or the opening degree of a flow valve of a circulating water pump set corresponding to the production load and the water supply temperature data of the production workshop in the total factory area or the factory area exist in a first database is queried;

if the first database has data of water supply flow and frequency or flow valve opening of a circulating pump group corresponding to the data of the production load and the water supply temperature of the production workshop in the general plant area or the plant area, the controller controls the frequency or opening flow valve of the circulating pump group under the condition that the circulating pump group or the flow valve is corresponding to the production load and the water supply temperature of the production workshop in the general plant area or the plant area;

if the first database does not have data of water supply flow and frequency or flow valve opening of a circulating water pump set corresponding to the production load and water supply temperature data of the production workshop in the total plant area or the plant area, the frequency of the circulating water pump set in the total plant area or the plant area is controlled or the opening of a flow valve on the production workshop in the plant area is changed, in the process of flow change, when the temperature or pressure of circulating water triggers the temperature or pressure protection value of a sensitive area of the production workshop in the total plant area or the plant area, the reduction of the frequency of the circulating water pump set in the total plant area or the opening of the flow valve on the production workshop in the plant area is stopped, and at the moment, a controller collects the data of the water supply temperature, the water supply flow and the frequency or flow valve opening of the circulating water pump set of the production workshop in the total plant area or the plant area, and collects the data of the water supply temperature, the water supply flow and the frequency or flow valve opening of the circulating water pump set of the production load of the production workshop in the total plant area or the plant area, Establishing a mapping relation among the water supply temperature, the water supply flow and the frequency of the circulating water pump set or the opening degree of a flow valve, and storing the mapping relation in a first database;

and acquiring the production load and water supply temperature data of the workshop in the total plant area or the plant area again for query.

2. The method for controlling a circulating water system according to claim 1, further comprising the steps of:

when the controller cannot obtain the production load data of a general factory area or a certain production workshop in the factory area and only obtains the water supply temperature data for inquiring, the water supply temperature data of the production workshop in the general factory area or the factory area is taken as an index, and whether the second database has the data of the water supply flow and the frequency of the circulating water pump set or the opening degree of the flow valve corresponding to the water supply temperature data of the production workshop in the general factory area or the factory area or not is inquired;

if the second database has data of water supply flow and frequency or flow valve opening of the circulating water pump set corresponding to the water supply temperature data of the production workshop in the general plant area or the plant area, the controller controls the frequency or flow valve opening of the circulating water pump set or the flow valve in the general plant area or the production workshop corresponding to the water supply temperature of the production workshop in the plant area;

if the second database does not have the data of the water supply flow and the frequency or the opening degree of a flow valve of the circulating water pump set corresponding to the water supply temperature data of the production workshop in the total plant area or the plant area, the circulating water flow is changed by controlling the frequency of the circulating water pump set of the total plant area or changing the opening degree of the flow valve on the production workshop in the plant area, in the process of flow change, when the temperature or the pressure of circulating water triggers the temperature or the pressure protection value of the sensitive area of the production workshop in the total plant area or the plant area, the frequency of the total circulating water pump set of the total plant area or the opening degree of the flow valve on the production workshop in the plant area is stopped to be reduced, and at the moment, the controller collects the data of the water supply temperature, the water supply flow and the frequency or the opening degree of the flow valve of the circulating water pump set of the production workshop in the total plant area or the plant area, and collects the data of the water supply temperature, the frequency or the opening degree of the flow valve of the production workshop in the total plant area or the plant area, Establishing a mapping relation between the water supply flow and the frequency of the circulating water pump set or the opening of the flow valve and storing the mapping relation in a second database;

and acquiring the water supply temperature data of the total plant area or the workshop in the plant area again for query.

3. The method as claimed in claim 1, wherein the controller collects the data of the production load, the water supply temperature, the water supply flow rate, the frequency of the circulating water pump set or the opening degree of the flow valve of the production workshop in the total plant area or the plant area and collects the water return temperature of the production workshop in the plant area or the plant area.

4. The method of claim 3, wherein the difference between the return water temperature and the supply water temperature is mapped as one of the data into the first database corresponding to the production load and the supply water temperature.

5. The method as claimed in claim 2, wherein the controller collects the water supply temperature and water supply flow rate of the production workshop in the main plant area or the plant area and the frequency of the circulating water pump set or the opening degree of the flow valve, and simultaneously collects the water return temperature of the production workshop in the main plant area or the plant area.

6. The method of claim 5, wherein the difference between the supply water temperature and the return water temperature is mapped as one of the data to a second database corresponding to the supply water temperature.

7. A circulating water system adopting the circulating water system control method of any one of claims 1 to 6, comprising a circulating water cooling pipeline, a circulating water main supply pipeline, a circulating water utilization pipeline and a circulating water main return pipeline which are connected in sequence, wherein the circulating water main return pipeline is connected with the circulating water cooling pipeline, the circulating water utilization pipeline comprises a plurality of production workshop circulating water branches which are mutually connected in parallel, each production workshop circulating water branch is provided with a temperature sensitive area and a pressure sensitive area, the production workshop circulating water branches are provided with a flow control valve, a sensitive area temperature sensor, a sensitive area pressure sensor, a branch return water flow sensor and a return water temperature sensor, the sensitive area temperature sensor is arranged in the temperature sensitive area, the sensitive area pressure sensor is arranged in the pressure sensitive area, and a water supply temperature sensor is arranged on the circulating water main water supply pipe.

8. The circulating water system as claimed in claim 7, wherein a total pressure sensor is further provided on the circulating water main supply pipe.

9. The circulating water system of claim 7, wherein the circulating water main return pipe is provided with a main return flow sensor.

10. A circulating water system as claimed in any one of claims 7 to 9, wherein the circulating water cooling pipeline comprises a plurality of cooling towers and a plurality of inverter motor water pumps, the cooling towers are respectively connected with the circulating water main return pipe and the inverter motor water pumps, and the inverter motor water pumps are connected with the circulating water main supply pipe.

Technical Field

The invention relates to the technical field of industrial or commercial circulating cooling water, in particular to a circulating water system with balanced supply and demand under different loads and water supply temperatures and a control method.

Background

A circulating water station is required to be built during industrial production of refining, petrochemical industry, chemical industry, pharmaceutical and chemical industry, steel, power generation and the like, then field equipment is cooled by using circulating water, the circulating amount of the circulating water station is designed according to the maximum production load and the maximum water supply temperature of an enterprise, and on the basis, some surplus water is required. The circulating water is open-type circulation, and is cooled by the cooling tower fan, the water supply temperature of the circulating water is greatly influenced by the external environment, the difference between spring, summer, autumn and winter is large, even the difference between days is large, the water supply temperature is different, the heat exchange efficiency is different, and the water quantity required under the same production load is different. And the production load of enterprises can change along with the change of market environment, but the circulating water quantity is generally controlled according to constant current or constant voltage, intelligent flow distribution can not be carried out according to the condition, and a large amount of energy consumption waste can be caused.

In actual production, each set of production device is far away from the circulating water station, and the sizes of the circulating water pipes are different, so that the water supply quantity of the production device close to the circulating water station is far larger than the required quantity, the water quantity of the device farthest from the circulating water station is often insufficient, and the heat exchange efficiency is poor. Moreover, the production load of each set of device varies differently, which further aggravates the water unbalance of each production device.

When the control target is the water consumption of each set of production device or each production workshop in a plant area or a plant, a temperature sensitive area and a pressure sensitive area exist on each set of production device or each production workshop in the plant area or the plant area, the temperature sensitive area is defined to be similar to a wooden barrel principle, when the flow is reduced, the temperature of equipment of the plant area or the production workshop and the device is increased, the area is most sensitive to the reduction of the flow, and the temperature reaches a design protection value firstly; the pressure sensitive area, pressure have represented the lift of water promptly, and at the in-process that reduces flow, its lift also can follow the reduction, and the general peak of using water is exactly the pressure sensitive area, and the circulating water must reach certain flow value promptly, ensures that the highest department can obtain the supply of circulating water in every set of apparatus for producing of whole plant.

Disclosure of Invention

In order to solve the problems, the technical scheme provided by the invention is as follows:

a control method of a circulating water system comprises the following steps:

setting a temperature protection value and a pressure protection value of a factory area or a sensitive area of each production workshop in the factory area;

when the controller simultaneously obtains the production load and water supply temperature data of a certain production workshop in the total factory area or the factory area for query, the data of the production load and the water supply temperature of the production workshop in the total factory area or the factory area are taken as indexes, and whether the data of the water supply flow and the frequency or the opening degree of a flow valve of a circulating water pump set corresponding to the production load and the water supply temperature data of the production workshop in the total factory area or the factory area exist in a first database is queried;

if the first database has data of water supply flow and frequency or flow valve opening of a circulating pump group corresponding to the data of the production load and the water supply temperature of the production workshop in the general plant area or the plant area, the controller controls the frequency or opening flow valve of the circulating pump group under the condition that the circulating pump group or the flow valve is corresponding to the production load and the water supply temperature of the production workshop in the general plant area or the plant area;

if the first database does not have data of water supply flow and frequency or flow valve opening of a circulating water pump set corresponding to the production load and water supply temperature data of the production workshop in the total plant area or the plant area, the frequency of the circulating water pump set in the total plant area or the plant area is controlled or the opening of a flow valve on the production workshop in the plant area is changed, in the process of flow change, when the temperature or pressure of circulating water triggers the temperature or pressure protection value of a sensitive area of the production workshop in the total plant area or the plant area, the reduction of the frequency of the circulating water pump set in the total plant area or the opening of the flow valve on the production workshop in the plant area is stopped, and at the moment, a controller collects the data of the water supply temperature, the water supply flow and the frequency or flow valve opening of the circulating water pump set of the production workshop in the total plant area or the plant area, and collects the data of the water supply temperature, the water supply flow and the frequency or flow valve opening of the circulating water pump set of the production load of the production workshop in the total plant area or the plant area, Establishing a mapping relation among the water supply temperature, the water supply flow and the frequency of the circulating water pump set or the opening degree of a flow valve, and storing the mapping relation in a first database;

and acquiring the production load and water supply temperature data of the workshop in the total plant area or the plant area again for query.

When the controller cannot obtain the production load data of a general factory area or a certain production workshop in the factory area and only obtains the water supply temperature data for inquiring, the water supply temperature data of the production workshop in the general factory area or the factory area is taken as an index, and whether the second database has the data of the water supply flow and the frequency of the circulating water pump set or the opening degree of the flow valve corresponding to the water supply temperature data of the production workshop in the general factory area or the factory area or not is inquired;

if the second database has data of water supply flow and frequency or flow valve opening of the circulating water pump set corresponding to the water supply temperature data of the production workshop in the general plant area or the plant area, the controller controls the frequency or flow valve opening of the circulating water pump set or the flow valve in the general plant area or the production workshop corresponding to the water supply temperature of the production workshop in the plant area;

if the second database does not have data of water supply flow and frequency or flow valve opening of a circulating water pump set corresponding to water supply temperature data of the production workshop in the general plant area or the plant area, the circulating water flow is changed by controlling the frequency of the circulating water pump set in the general plant area or changing the opening of a flow valve on the production workshop in the plant area, in the process of flow change, when the temperature or pressure of circulating water triggers the temperature or pressure protection value of a sensitive area of the production workshop in the general plant area or the plant area, the frequency of the general circulating water pump set in the general plant area or the opening of the flow valve on the production workshop in the plant area is stopped to be reduced, at the moment, the controller collects the data of the water supply temperature, the water supply flow and the frequency or flow valve opening of the circulating water pump set in the general plant area or the plant area, and establishes a mapping relation between the water supply temperature, the water supply flow and the frequency or flow valve opening of the circulating water pump set in the general plant area or the plant area and stores the mapping relation into the second database In a second database;

and acquiring the water supply temperature data of the total plant area or the workshop in the plant area again for query.

The method for controlling the circulating water system is further set to acquire the production load, the water supply temperature and the water supply flow of the production workshop in the main plant area or the plant area and acquire the return water temperature of the production workshop in the main plant area or the plant area while acquiring the data of the frequency of the circulating water pump set or the opening of the flow valve.

The circulating water system control method of the present invention is further configured such that a value of a difference between a return water temperature and the supply water temperature is mapped as one of data into a first database corresponding to a production load and a supply water temperature.

The control method of the circulating water system is further set to acquire the water return temperature of the production workshop in the main plant area or the plant area while the controller acquires the acquired data of the water supply temperature and the water supply flow of the production workshop in the main plant area or the plant area and the frequency of the circulating water pump set or the opening of the flow valve.

The control method of the circulating water system of the present invention is further configured such that a value of a difference between a return water temperature and the supply water temperature is mapped as one of data into a second database corresponding to the supply water temperature.

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

(1) when the controller obtains the production load of a corresponding production workshop in a general plant area or a plant area through DCS communication, on the basis of obtaining the production load, the controller controls the frequency or the opening degree of a flow valve of a circulating water pump set to avoid the excessive cooling of equipment or raw materials by changing the circulating water flow when the water supply temperature and the production load are different, in the process of reducing the flow, when the temperature or the pressure is close to a protection value, the controller controls the circulating water pump set or the flow valve to stop reducing the output quantity of circulating water, at the moment, the controller collects the data of the water supply temperature, the water return temperature, the water supply flow and the frequency or the opening degree of the flow valve of the circulating water pump set of the general plant area or the production workshop in the plant area, establishes a mapping relation among the production load, the water supply temperature, the water return temperature, the water supply flow and the frequency or the opening degree of the flow valve of the circulating water pump set in the general plant area or the plant area and stores the mapping relation into a first database, the production load and the water supply temperature are combined and arranged continuously, so that the most energy-saving data of the circulating water pump set or the flow valve can be obtained under the conditions of different production loads and different water supply temperatures. And when the next time the controller obtains the data of the production load and the water supply temperature of the production workshop in the total plant area or the plant area, the data of the production load and the water supply temperature of the production workshop in the total plant area or the plant area is stored in the first database by looking up a table, the controller can directly call the data of the frequency or the flow valve of the circulating water pump set and control the frequency of the circulating water pump set or the flow valve entering the workshop to the corresponding size, and otherwise, a new mapping relation is established and stored in the first database. The frequency of a circulating water pump set or the response time of the opening of a flow valve can be quickly reduced through intelligent management, so that the water supply of a circulating water system and the water consumption required by a field production device reach dynamic balance, and the aim of optimal energy conservation is fulfilled.

(2) When the controller can not obtain the production load of a corresponding production workshop in a factory area or a factory area through DCS communication, the default production load is 100%, the frequency of a circulating water pump set or the opening of a flow valve is operated to the size under the condition of full load of the production workshop, the controller controls the frequency of the circulating water pump set or the opening of the flow valve to change the flow of circulating water according to different water supply temperatures so as to avoid the overcooling of equipment or raw materials, when the temperature or the pressure is close to a protection value in the process of reducing the flow, the controller controls the circulating water pump set or the flow valve to stop reducing the output quantity of the circulating water, and at the moment, the controller collects the data of the water supply temperature, the water return temperature, the water supply flow and the frequency or the opening of the flow valve of the circulating water pump set in the total factory area or the factory area and collects the data of the water supply temperature, the water return temperature, the water flow and the opening of the production workshop in the factory area or the factory area, A mapping relation is established between the water supply flow and the frequency of the circulating water pump set or the opening of the flow valve, and is stored in a second database, and the ranges of different water supply temperatures are continuously collected, so that the most energy-saving data of the frequency of the circulating water pump set or the opening of the flow valve under different water supply temperature conditions are obtained. Therefore, under the condition that the load of the factory area or the production workshop in the factory area cannot be obtained, only the influence of the water supply temperature on the flow required by the production workshop in the factory area or the factory area is considered. When the next time the controller only obtains the water supply temperature data of the factory area or the production workshop of the factory area but cannot obtain the production load data, the data of the water supply temperature of the production workshop in the total factory area or the factory area is stored in the second database through table lookup, the controller can directly call the data of the frequency or the flow valve of the circulating water pump set and control the circulating water pump set or the flow valve to be opened to the corresponding size, and otherwise, a new mapping relation is established and stored in the second database. The frequency of a circulating water pump set or the response time of the opening of a flow valve can be quickly reduced through intelligent management, so that the dynamic balance between the water supply of a circulating water system and the water consumption required by a field production device is achieved, and the purpose of optimal energy conservation is achieved.

A circulating water system adopting a circulating water system control method comprises a circulating water cooling pipeline, a circulating water main water supply pipe, a circulating water pipeline and a circulating water main water return pipe which are connected in sequence, the circulating water main return pipe is connected with a circulating water cooling pipeline, the circulating water pipeline comprises a plurality of production workshop circulating water branches which are mutually connected in parallel, each production workshop circulating water branch is provided with a temperature sensitive area and a pressure sensitive area, a flow control valve, a sensitive area temperature sensor, a sensitive area pressure sensor, a branch return water flow sensor and a return water temperature sensor are arranged on the circulating water branch of the production workshop, the temperature sensor of the sensitive area is arranged in the temperature sensitive area, the pressure sensor of the sensitive area is arranged in the pressure sensitive area, and the water supply temperature sensor is arranged on the circulating water main water supply pipe.

The circulating water system is further provided with a total pressure sensor on the circulating water main water supply pipe.

The circulating water system is further provided with a total return water flow sensor arranged on a total return water pipe of the circulating water.

The circulating water system is further provided with a circulating water cooling pipeline which comprises a plurality of cooling towers and a plurality of variable frequency motor water pumps, wherein the cooling towers are respectively connected with the circulating water main return pipe and the variable frequency motor water pumps, and the variable frequency motor water pumps are connected with the circulating water main water supply pipe.

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

the circulating water system of the invention is provided with a flow control valve, a sensitive area temperature sensor, a sensitive area pressure sensor, a branch return water flow sensor and a return water temperature sensor on each circulating water branch of a production workshop, a water supply temperature sensor is arranged on the circulating water main water supply pipe, a backwater flowmeter and a backwater temperature sensor are arranged on the main backwater pipe, the water supply temperature, the total water supply flow, the return water temperature, the temperature and the pressure of a sensitive area of the plant area, the frequency of a circulating water pump set or the temperature of the supplied water, the return water temperature and the temperature difference of the circulating water branch of each production workshop, the temperature of the sensitive area, the pressure of the sensitive area, the circulating water flow and the opening degree of a flow control valve can be obtained, and the water supply of a circulating water system and the water consumption required by a field production device can be dynamically balanced by matching with the control method of the circulating water system, so that the aim of optimal energy conservation is fulfilled; and the quantity and the power of the variable frequency motor water pumps which are put into operation are controlled according to the total requirement of circulating water of each production workshop.

Drawings

Fig. 1 is a flow chart of a control method of a circulating water system in which the total water consumption of a plant area is taken as a control target in embodiment 1 of the present invention.

Fig. 2 is a flowchart of a method for controlling a circulating water system in which the water consumption of the plant room is taken as a control target for fine management in embodiment 2 of the present invention.

Fig. 3 is a flow chart of a method for controlling a circulating water system according to embodiment 3 of the present invention, wherein the method is aimed at controlling the total water consumption of a plant.

Fig. 4 is a flowchart of a control method of a circulating water system for fine control with the water consumption of the workshop in the plant area as a control target in embodiment 4 of the present invention.

Fig. 5 is a table diagram of a first database established according to the method for controlling a circulating water system in embodiment 1 of the present invention.

Fig. 6 is a second database table diagram established according to the circulating water system control method in embodiment 3 of the present invention.

Fig. 7 is a table diagram of a first database established according to a circulating water system control method in embodiment 2 of the present invention.

Fig. 8 is a diagram of a second database table established according to the method for controlling a circulating water system in embodiment 4 of the present invention.

Fig. 9 is a schematic view of a circulating water system finely managed by taking the water consumption of the workshop in the plant area as a control target in embodiment 5 of the present invention.

Fig. 10 is a schematic view of a circulating water system in which the total water consumption of a plant area is used as a control target in embodiment 6 of the present invention.

Detailed Description

For a further understanding of the present invention, reference will now be made in detail to the embodiments illustrated in the drawings.

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. The terms first, second, and the like in the present invention are provided for convenience of describing the technical solution of the present invention, and have no specific limiting effect, but are all generic terms, and do not limit the technical solution of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solutions in the same embodiment and the technical solutions in different embodiments can be arranged and combined to form a new technical solution without contradiction or conflict, and the technical solutions are within the scope of the present invention.

Example 1

With reference to the attached drawing 1, the technical scheme of the invention is a circulating water system control method, which takes circulating water of a general plant area as a control target and comprises the following steps:

setting a temperature protection value and a pressure protection value of a sensitive area in a total plant area;

when the controller simultaneously obtains the production load and the water supply temperature data of the total plant area for query, the production load and the water supply temperature data of the total plant area are taken as indexes, and whether the first database has the water supply flow and the frequency of the circulating water pump set corresponding to the production load and the water supply temperature data of the total plant area is queried;

if the first database has data of water supply flow and frequency of the circulating pump group corresponding to the data of the production load and the water supply temperature of the total plant area, the controller controls the frequency of the circulating pump group corresponding to the production load and the water supply temperature of the total plant area;

if the first database does not have data of water supply flow and frequency of a circulating water pump set corresponding to the data of the production load and the water supply temperature of the total plant area, the flow of the circulating water is changed by controlling the frequency of the circulating water pump set of the total plant area, in the process of flow change, when the temperature or the pressure of the circulating water triggers the temperature or the pressure protection value of a sensitive area in the total plant area, the frequency of the circulating water pump set of the total plant area is stopped to be reduced, at the moment, the controller collects the data of the water supply temperature, the water supply flow and the frequency of the circulating water pump set of the total plant area, and the production load, the water supply temperature, the water supply flow and the frequency of the circulating water pump set of the total plant area are established to form a mapping relation to be stored in the;

and acquiring the production load and water supply temperature data of the total plant area again for query.

The first database is established by the dead-angle-free combined arrangement of production load and water supply temperature, for example, the production load is 0-100%, the water supply temperature is 0-50 ℃, the water supply temperature range is covered, the accuracy of the production load and the water supply temperature can be set according to actual conditions, the combination of the production load and the water supply temperature is continuously enriched and perfected through the monthly intelligent database establishment, when the controller acquires the data corresponding to the production load and the water supply temperature stored in the first database next time, the frequency of the corresponding circulating water pump set is directly called, the response time of the frequency of the circulating water pump set can be quickly reduced, the water supply of the circulating water system and the water required by a field production device are dynamically balanced, and the flow of the circulating water is controlled and reduced.

As shown in fig. 5, the controller collects the acquired data of the production load, the water supply temperature, the water supply flow and the frequency of the circulating water pump set of the total plant area, and simultaneously acquires the return water temperature of the total plant area, the numerical value of the difference between the return water temperature and the water supply temperature is mapped into a first database corresponding to the production load and the water supply temperature as one of the data, and the mapping relation of a plurality of groups of production loads, the water supply temperature, the temperature difference, the flow, the water pump motor combination, the frequency of the circulating water pump set, the temperature protection value of the sensitive area and the pressure protection value of the sensitive area is established and stored in the first database. The temperature difference is the difference between the return water temperature and the water supply temperature.

According to the formula Q ═ C × L (T1-T2),

q: producing the required cold quantity; l: circulating water flow rate; c: the specific heat capacity of water; t1: circulating water return temperature; t2: the supply water temperature of the circulating water.

The method is characterized in that the method comprises the following steps of obtaining the temperature difference of the circulating water, and establishing a database by taking the temperature difference as one of data, wherein the temperature difference is more suitable for the production load, and the relation between the temperature of the circulating water and the production load and the flow can be more intuitively reflected.

Example 2

With reference to the attached figure 2, the technical scheme of the invention is a circulating water system control method, which takes circulating water of each production workshop in a factory as a control target and comprises the following steps:

setting a temperature protection value and a pressure protection value of a sensitive area in each production workshop in a factory;

when the controller simultaneously obtains the production load and water supply temperature data of a certain production workshop in the plant area for query, and the production load and water supply temperature data of the production workshop in the plant area are taken as indexes to query whether the first database has the data of water supply flow and flow valve opening corresponding to the production load and water supply temperature data of the production workshop in the plant area;

if the first database has data of water supply flow and flow valve opening corresponding to the production load and water supply temperature data of the production workshop in the factory, the controller controls the flow valve opening of the flow valve in the factory according to the production load and water supply temperature of the production workshop;

if the first database does not have data of water supply flow and flow valve opening corresponding to the production load and water supply temperature data of the production workshop in the factory area, the opening of a flow valve on the production workshop in the factory area is changed to change the flow of circulating water, in the process of changing the flow, after the temperature or pressure of the circulating water triggers the temperature or pressure protection value of a sensitive area of the production workshop in the factory area, the opening of the flow valve on the production workshop in the factory area is stopped to be reduced, at the moment, a controller collects the data of the water supply temperature, the water supply flow and the flow valve opening of the production workshop in the factory area, and establishes a mapping relation among the production load, the water supply temperature, the water supply flow and the flow valve opening of the production workshop in the factory area and stores the mapping relation into the first database;

and acquiring the production load and water supply temperature data of the workshop in the plant area again for query.

The difference between embodiment 2 and embodiment 1 lies in the difference of control targets, and accordingly the output object is controlled to be changed from the circulating water pump set to the flow valve, that is, the frequency of the circulating water pump set and the opening of the flow valve are consistent in both the database establishment and the table lookup method, and are not described again.

As shown in fig. 6, the controller collects data of production load, water supply temperature, water supply flow and opening of the flow valve of the production workshop in the plant area, and simultaneously collects return water temperature of the production workshop in the plant area, and a value of a difference between the return water temperature and the water supply temperature is mapped into a first database corresponding to the production load and the water supply temperature as one of the data. The temperature difference is the difference between the return water temperature and the water supply temperature.

Example 3

With reference to fig. 3, embodiment 3 is expanded on the basis of embodiment 1, and further includes the following steps:

when the controller cannot obtain the production load data of the total plant area and only obtains the water supply temperature data for inquiring, the water supply temperature data of the total plant area is taken as an index, and whether the second database has the data of the water supply flow and the frequency of the circulating water pump set corresponding to the water supply temperature data of the total plant area is inquired;

if the second database has data of water supply flow and frequency of the circulating water pump group corresponding to the water supply temperature data of the main plant area, the controller controls the frequency of the circulating water pump group under the condition that the water supply temperature of the main plant area corresponds to the circulating water pump group;

if the second database does not have data of water supply flow and frequency of a circulating water pump set corresponding to the water supply temperature data of the total plant area, the frequency of the circulating water pump set of the total plant area is controlled to change the flow of the circulating water, in the flow change process, when the temperature or pressure of the circulating water triggers the temperature or pressure protection value of a sensitive area in the total plant area, the frequency of the total circulating water pump set of the total plant area is stopped to be reduced, at the moment, the controller collects the data of the water supply temperature, the water supply flow and the frequency of the circulating water pump set of the total plant area, and establishes a mapping relation among the water supply temperature, the water supply flow and the frequency of the circulating water pump set of the total plant area and stores the mapping relation into the second database;

and acquiring the water supply temperature data of the total plant area again for query.

The first database is established by the dead-angle-free combined arrangement of production load and water supply temperature, for example, the production load is 0-100% and the water supply temperature is 0-50 ℃, the water supply temperature range is covered, the accuracy of the production load and the water supply temperature can be set according to actual conditions, the combination of the production load and the water supply temperature is continuously enriched and perfected through the intelligent database establishment in the year-round period, when the controller acquires the data corresponding to the production load and the water supply temperature existing in the first database next time, the frequency of the corresponding circulating water pump group is directly called, the frequency of the circulating water pump group can be quickly responded to the corresponding value, the water supply of a circulating water system and the water required by a field production device are dynamically balanced, and the flow of circulating water is controlled and reduced; and a second database is additionally arranged and is established under the condition that the load of the production workshop cannot be obtained, the establishment mode is similar to that of the first database, the difference is that the parameter of the production load is ignored, only the influence of the water supply temperature on the flow required by the production workshop is considered, and the frequency of controlling the circulating water pump set is also the same principle. The technical scheme in the embodiment 3 is that when the production load and the water supply temperature are obtained simultaneously, the pump set frequency or the valve opening corresponding to the first database is called or a mapping relation is established and stored in the first database; and when the production load cannot be obtained and only the water supply temperature is obtained, the pump set frequency or the valve opening corresponding to the second database is called or a mapping relation is established and stored in the second database.

As shown in fig. 7, the controller collects the acquired data of the water supply temperature, the water supply flow and the frequency of the circulating water pump set of the total plant area, and simultaneously collects the water return temperature of the total plant area, the numerical value of the difference between the water return temperature and the water supply temperature is mapped into a second database corresponding to the water supply temperature as one of the data, and a mapping relation of a plurality of groups of water supply temperatures, temperature differences, flow rates, water pump motor combinations, the frequency of the circulating water pump set, a temperature protection value of a sensitive area and a pressure protection value of the sensitive area is established and stored in the second database.

Example 4

With reference to fig. 4, embodiment 4 is expanded on the basis of embodiment 2, and further includes the following steps:

when the controller cannot obtain production load data of a certain production workshop in the plant area and only obtains water supply temperature data for inquiring, the water supply temperature data of the production workshop in the plant area is taken as an index, and whether data of water supply flow and flow valve opening corresponding to the water supply temperature data of the production workshop in the plant area exist in a second database or not is inquired;

if the second database has data of water supply flow and flow valve opening corresponding to the water supply temperature data of the production workshop in the factory, the controller controls the flow valve opening of the flow valve corresponding to the water supply temperature of the production workshop in the factory;

if the second database does not have data of water supply flow and opening of a flow valve corresponding to the data of the water supply temperature of the production workshop in the factory area, the opening of the flow valve on the production workshop in the factory area is changed to change the flow of circulating water, in the process of changing the flow, when the temperature or pressure of the circulating water triggers the temperature or pressure protection value of a sensitive area in the production workshop in the factory area, the opening of the flow valve on the production workshop in the factory area is stopped to be reduced, at the moment, the controller collects the data of the water supply temperature, the water supply flow and the opening of the flow valve of the production workshop in the factory area, and establishes a mapping relation among the water supply temperature, the water supply flow and the opening of the flow valve of the production workshop in the factory area to be stored in the second database;

and acquiring the water supply temperature data of the workshop in the plant area again for query.

The difference between embodiment 4 and embodiment 3 lies in the difference of control targets, and accordingly the output object is controlled to be changed from a circulating water pump set to a flow valve, and the two methods are consistent in establishing a database and searching a table, and are not repeated again.

As shown in fig. 8, the controller acquires the data of the water supply temperature, the water supply flow and the opening of the flow valve of the production workshop in the plant area, and acquires the water return temperature of the production workshop in the plant area, and the value of the difference between the water return temperature and the water supply temperature is mapped into a second database corresponding to the water supply temperature as one of the data, and for example, a production workshop a in the plant area is used to establish a plurality of sets of mapping relationships of the water supply temperature, the temperature difference, the flow rate, the opening of the flow valve, the temperature protection value of the sensitive area and the pressure protection value of the sensitive area, and store the mapping relationships into the second database.

Example 5

With reference to fig. 9, the technical scheme of the present invention is a circulating water system using a circulating water system control method with refined management of each workshop water consumption as a control target, comprising a circulating water cooling pipeline 1b, a circulating water main water supply pipe 2b, a circulating water pipeline 3b and a circulating water main water return pipe 4b which are connected in sequence, wherein the circulating water main water return pipe 4b is connected with the circulating water cooling pipeline 1b, the circulating water pipeline 3b comprises a plurality of production workshop circulating water branches 31b which are connected in parallel, each production workshop circulating water branch 31b is provided with a temperature sensitive area and a pressure sensitive area, the production workshop circulating water branch 31b is provided with a flow control valve 311b, a sensitive area temperature sensor 312b, a sensitive area pressure sensor 313b, a branch water flow sensor 314b and a return water temperature sensor 315b, sensitive area temperature sensor 312b sets up temperature sensitive area, sensitive area pressure sensor 315b sets up in pressure sensitive area, be provided with water supply temperature sensor 21b and total pressure sensor 22b on the circulating water total delivery pipe 2b, the total wet return of circulating water 4b is provided with total return flow sensor 41b, circulating water cooling pipeline 1b includes a plurality of cooling tower 11b and a plurality of inverter motor water pump 12b, cooling tower 11b respectively with the total wet return of circulating water 4b with inverter motor water pump 12b is connected, inverter motor water pump 12b with the circulating water total delivery pipe 2b is connected.

Example 6

With reference to fig. 10, the technical scheme of the present invention is a circulating water system using a circulating water system control method with plant total water consumption as a control target, comprising a circulating water cooling pipeline 1a, a circulating water main water supply pipeline 2a, a circulating water using pipeline 3a, and a circulating water main water return pipeline 4a which are connected in sequence, wherein the circulating water main water return pipeline 4a is connected with the circulating water cooling pipeline 1a, the circulating water using pipeline 3a comprises a plurality of production device circulating water branches 31a which are connected in parallel, a production device circulating water branch 31a with a temperature sensitive area and a production device circulating water branch 31a with a pressure sensitive area are arranged in the plurality of production device circulating water branches 31a, a flow change sensitive area heat exchange device is arranged on the production device circulating water branch 31a with the temperature sensitive area, a sensitive area temperature sensor 311a is arranged on the flow change sensitive area heat exchange device, the production device is characterized in that a pressure-sensitive area pressure sensor 312a is arranged on a circulating water branch 31a of the production device with the pressure-sensitive area, a water supply temperature sensor 21a is arranged on a circulating water main water supply pipe 2a, a return water temperature sensor 41a and a total return water flow sensor 42a are arranged on a circulating water main return pipe 4a, a circulating water cooling pipeline 1a comprises a plurality of cooling towers 11a and a plurality of variable frequency motor water pumps 12a, the cooling towers 11a are respectively connected with the circulating water main return pipe 4a and the variable frequency motor water pumps 12a, and the variable frequency motor water pumps 12a are connected with the circulating water main water supply pipe 2 a.

When the water consumption of each workshop is taken as a control target to carry out fine management, the change of the circulating water quantity of each production workshop causes the change of the circulating water demand of a main factory, and the controller can control the circulating pump group according to the most energy-saving control method of the circulating pump group with the Chinese patent number of 201710815497.6, so that the purpose of best energy saving is achieved.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.