CN113433916B - Chemical plant water circulation control method and equipment - Google Patents

Abstract

The embodiment of the application discloses a method and equipment for controlling water circulation of a chemical plant, wherein the method comprises the following steps: controlling the circulating oil pump to operate based on the temperature of the solar thermal collector so that heat conducting oil circularly flows between the solar thermal collector and the heat exchanger, and heating water in the steam generator through the heat exchanger to generate steam; conveying the steam in the steam generator to a working section needing to use the steam through a steam pipeline; collecting and condensing used steam through a condenser, and conveying condensed water in the condenser to a cooling tower; controlling a first water pump to operate based on the temperature in the cooling tower to deliver the cooling water in the cooling tower to the industrial equipment requiring water; collecting waste water generated by industrial equipment needing water into a waste water treatment device through a pipeline for treatment; and conveying the treated wastewater into a steam generator through a second water pump. The water circulation system is used for solving the technical problems that the existing water circulation system of a chemical plant wastes energy and has a single control mode.

Description

A kind of chemical plant water circulation control method and equipment

technical field

The present application relates to the field of automatic control, and in particular, to a method and device for controlling water circulation in a chemical plant.

Background technique

There are a large number of water equipment and heat-using sections in chemical plants, so chemical plants have very high demand for water resources and thermal energy. In particular, superheated steam is widely used in the production of chemical plant workshops. The production of desulfurization section, ammonium sulfate section and other sections and the heating of each section have great demand for superheated steam. To conserve water resources, each chemical plant has its own water recycling system for recycling wastewater.

In the actual production process, steam boilers generally use natural gas, fuel oil, and electric heating to provide heat, but these energy sources are costly and pollute the environment to a certain extent. After the superheated steam is generated, the waste steam after heating in each section, the waste steam after heating the sulfur-melting kettle in the desulfurization section, and the waste steam after heating the air by the steam heater in the ammonium sulfate section are all discharged into the atmosphere, causing heat energy and water resources. waste. In addition, the existing water circulation system control modes of chemical plants are relatively simple, and most of them can only carry out the water circulation process according to a unified mode, and cannot intelligently control the water circulation system according to the specific situation, resulting in waste of energy consumption.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a chemical plant water circulation control method and device, which are used to solve the following technical problems: the existing chemical plant water circulation system wastes energy and has a single control mode.

The embodiment of the present application adopts the following technical solutions:

On the one hand, an embodiment of the present application provides a method for controlling water circulation in a chemical plant, the method comprising: controlling the operation of a circulating oil pump based on the temperature of a solar heat collector, so that the heat transfer oil is placed between the solar heat collector and the heat exchanger. Circulating flow is carried out to heat the water in the steam generator through the heat exchanger to generate steam; the steam in the steam generator is transported to the section where steam needs to be used through the steam pipeline; the condenser is collected after use The steam in the condenser is condensed, and the condensed water in the condenser is sent to the cooling tower; based on the temperature in the cooling tower, the operation of the first water pump is controlled to deliver the cooling water in the cooling tower to the required In industrial equipment that uses water; the wastewater generated by the industrial equipment that requires water is collected into a wastewater treatment device for treatment; the treated wastewater is transported into the steam generator through a second water pump.

In a feasible implementation manner, the operation of the circulating oil pump is controlled based on the temperature of the solar heat collector, so that the heat transfer oil circulates between the solar heat collector and the heat exchanger, which specifically includes: by installing The first temperature sensor on the solar collector is used to obtain the temperature of the solar collector; when the temperature of the solar collector reaches a first preset threshold, the first circulating oil pump is controlled to start running to The heat-conducting oil is extracted from the heat-conducting oil tank and heated in the solar heat collector; the temperature of the heat-conducting oil in the solar heat collector is acquired through a second temperature sensor installed inside the solar heat collector; When the temperature of the heat-conducting oil in the heat exchanger reaches a second preset threshold, the first circulating oil pump is controlled to transport the heat-conducting oil in the solar heat collector to the heat exchanger; wherein, the heat exchanger is placed in the heat exchanger. in the steam generator.

In a feasible implementation manner, the method further includes: when the temperature of the solar thermal collector is not greater than a first preset threshold, controlling the second circulating oil pump to start running, so as to extract the heat transfer oil from the heat transfer oil tank The oil is heated in an electric heater; or, within a preset time when the first circulating oil pump starts to run, the first circulating oil pump and the second circulating oil pump are controlled to run at the same time, so that the heat transfer oil passes through at the same time. The solar thermal collector and the electric heater are heated until the temperature of the heat transfer oil in the solar thermal collector reaches the second preset threshold.

In a feasible implementation manner, before the water in the steam generator is heated by the heat exchanger to generate steam, the method further includes: obtaining the information through a liquid level sensor installed in the steam generator. The water level in the steam generator; when the water level of the steam generator is less than the third preset threshold, the rainwater purification device is controlled to inject purified rainwater into the steam generator; after the rainwater is injected, the steam is generated When the water level of the steam generator is still lower than the third preset threshold, control the backup water storage tank to inject water into the steam generator until the water level of the steam generator reaches a preset stop water injection height.

In a feasible implementation manner, heating the water in the steam generator to generate steam by the heat exchanger specifically includes: establishing the steam of the steam generator based on the steam usage law of each section that needs to use the steam A consumption model; wherein, the influencing factors of the steam usage law include at least one or more of the following: temperature factor, equipment rated steam consumption factor; based on the steam consumption model, determine the current steam consumption of each section; When the amount of steam generated in the generator reaches the amount of steam, the circulating oil pump is controlled to stop running.

In a feasible embodiment, the used steam is collected and condensed by a condenser, and the condensed water in the condenser is transported to a cooling tower, which specifically includes: based on the altitude and geographical location of the chemical plant, Determine the heating month; if the current month does not belong to the heating month, control the first automatic valve of the condenser to open and the second automatic valve to close, so as to transport the condensed water in the condenser to the cooling tower; if The current month belongs to the heating month, and the first automatic valve of the condenser is controlled to be closed and the second automatic valve to be opened, so as to transmit the condensed water in the condenser to the heating circulation system.

In a feasible embodiment, based on the temperature in the cooling tower, the operation of the first water pump is controlled to transport the cooling water in the cooling tower to the industrial equipment that needs water, which specifically includes: The third temperature sensor in the tower obtains the water temperature in the cooling tower; when the water temperature in the cooling tower is lower than the fifth preset threshold, control the operation of the first water pump to make the water temperature in the cooling tower The cooling water is sent to various industrial equipment; wherein, the cooling tower includes the condensed water and the waste hot water produced by other water-using equipment.

In a feasible implementation manner, after controlling the operation of the first water pump, the method further includes: collecting the differential pressure in the water outlet pipe of the cooling tower through a differential pressure flowmeter installed in the water outlet pipe of the cooling tower ; Determine the flow rate in the cooling tower outlet pipe based on the pressure difference and the pipe length ratio resistance of the cold water tower outlet pipe; determine the cooling tower outlet pipe based on the flow rate and the inner diameter of the cold water tower outlet pipe The flow rate in the water pipe; based on the pressure difference, the flow rate and the flow rate, adjust the output frequency of the frequency converter to adjust the rotational speed of the first water pump motor; or, in response to the received frequency conversion command, to the frequency converter Send a signal to adjust the output frequency of the frequency converter to adjust the rotational speed of the first water pump motor.

In a feasible embodiment, before controlling the operation of the circulating oil pump based on the temperature of the solar heat collector, so that the heat transfer oil circulates between the solar heat collector and the heat exchanger, the method further includes : Associate with the ERP management system of the chemical plant, and obtain order information in the ERP management system; analyze the keywords in the order information to obtain the task requirements of the order; if the task requirements include steam usage demand, obtain the time demand in the task demand; and control the operation of the circulating oil pump in advance according to the time demand.

On the other hand, an embodiment of the present application also provides a water cycle control device in a chemical plant, the device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores data that can be Instructions executed by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform any of the above-described embodiments.

The above-mentioned at least one technical solution adopted in the embodiments of the present application can achieve the following beneficial effects:

1. In the embodiment of the present application, the heat-conducting oil is heated by solar energy, and then the heated heat-conducting oil is used to heat the water in the steam generator to generate steam. The use of solar energy as a clean energy can reduce environmental pollution and save energy. When the solar energy is not enough to heat the heat transfer oil to the preset temperature, the electric heat can be automatically turned on to heat the heat transfer oil, thereby ensuring the continuous generation of steam.

2. In the embodiment of the present application, a model is established to predict the amount of steam required by the section that needs to use steam in the chemical plant, and then the amount of steam generated by the steam generator is controlled by controlling the circulating oil pump, thereby avoiding unnecessary steam waste.

3. In the embodiment of the present application, the used waste steam is collected in the condenser to obtain high-temperature condensed water. If it is a heating month, the high-temperature condensed water is transported to the heating circulation system, and if it is not a heating month, the high-temperature condensed water is transported to the cooling tower. After cooling, the cooled water is sent to various water equipment for reuse. Finally, the waste water used by the water equipment is treated to meet the standard and then sent to the steam generator for recycling. This scheme can maximize the utilization of water resources in chemical plants and save water resources.

4. The embodiment of the present application controls each pump and valve in the water circulation system through a complete control system, thereby controlling each node in the water circulation system to automatically operate according to preset rules, and can also flexibly set each pump and valve in the control system. The state and speed of the water circulation system can be controlled to control the operation mode of the water circulation system. It has a variety of control modes and realizes the intelligent operation of the water circulation system of the chemical plant.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments described in this application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort. In the attached image:

1 is a schematic structural diagram of a chemical plant water circulation control device provided in an embodiment of the present application;

2 is a schematic structural diagram of a water circulation system in a chemical plant provided by an embodiment of the present application;

1. Heat transfer oil tank, 2. First circulating oil pump, 3. Solar collector, 4. Steam generator, 5. Heat exchanger, 6. Second circulating oil pump, 7. Electric heater, 9. Condenser, 10 , first condenser valve, 12, second condenser valve, 13, cooling tower, 15, first water pump, 17 waste water treatment device, 18 second water pump, 19, rainwater purification device, 20, rainwater purification device valve, 21 , Spare water storage tank, 22. Spare water storage tank valve;

3 is a flow chart of a method for controlling water circulation in a chemical plant provided by an embodiment of the present application;

FIG. 4 is a schematic structural diagram of another chemical plant water circulation control device provided in the embodiment of the present application.

Detailed ways

Embodiments of the present application provide a method and device for controlling water circulation in a chemical plant.

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described The embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments of the present specification, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

FIG. 1 is a schematic structural diagram of a chemical plant water cycle control device provided by an embodiment of the application. As shown in FIG. 1 , the chemical plant water cycle control device 100 includes a collection device 110 , a PLC controller 120 and a frequency converter 130 .

Specifically, the collection device 110 includes a temperature collection device 111 , a liquid level collection device 112 and a differential pressure flowmeter 113 . The temperature acquisition device 111 includes several temperature sensors, which are respectively installed in the devices that need to measure temperature in the water circulation system of the chemical plant. The liquid level acquisition device 112 includes several liquid level sensors, which are respectively installed in the devices that need to measure the liquid level in the water circulation system of the chemical plant. The differential pressure flowmeter 113 is installed in the water outlet pipeline of the cooling tower.

The PLC controller 120 is used to receive various data collected by the collection device 110, calculate and process the above-mentioned various data, and send frequency conversion instructions to the inverter 130 according to a preset program or according to manually input instructions. The PLC controller 120 is also connected with each automatic valve in the chemical plant water circulation system to remotely control each automatic valve to open or close according to a preset program.

The frequency converter 130 is connected to each oil pump and water pump in the water circulation system of the chemical plant. After receiving the frequency conversion command, it changes the output frequency, thereby changing the speed of the motor in each oil pump and water pump, thereby controlling the liquid flow rate.

FIG. 2 is a schematic structural diagram of a chemical plant water circulation system provided by the embodiment of the application. As shown in FIG. 2 , the heat-conducting oil tank 1 is connected to the oil inlet of the heat exchanger 5 through the solar heat collector 3 and the electric heater 7 respectively, The oil outlet of the heat exchanger 5 is connected with the heat transfer oil tank 1 to form a heat transfer oil circulation route. By controlling the first circulating oil pump 2 or the second circulating oil pump 6, it is possible to control whether the heat transfer oil is heated by solar energy or by electric heat. The heat exchanger 5 is placed in the steam generator 4 for heating the water in the steam generator 4 to generate steam. The steam generator 4 is connected with the steam-using section 8 through a steam pipeline, and the steam-using section 8 is connected with the condenser 9 . The condenser 9 is connected to the heating circuit 11 through a first condenser valve 10 and to the cooling tower 13 through a second condenser valve 12 . The cooling tower 13 is connected to the industrial equipment 16 through the first water pump 15 and the water supply pipeline. The industrial equipment 16 is connected to the waste water treatment device 17 . The waste water treatment device 17 is connected to the steam generator through a second water pump 18 and a water supply pipeline. In addition, the rainwater purification device 19 is connected to the steam generator 4 through the rainwater purification device valve 20 , and the backup water storage tank 21 is connected to the steam generator 4 through the backup water storage tank valve 22 .

Based on the chemical plant water circulation control device 100 shown in FIG. 1 and the chemical plant water circulation system shown in FIG. 2 , a chemical plant water circulation control method provided by the embodiments of the present application can be implemented. As shown in Figure 3, the chemical plant water cycle control method may specifically include S301-S306:

S301 : The chemical plant water circulation control device 100 controls the operation of the circulating oil pump based on the temperature of the solar heat collector 3 , so that the heat transfer oil circulates between the solar heat collector 3 and the heat exchanger 5 .

Specifically, the chemical plant water cycle control device 100 acquires the inner surface temperature of the solar thermal collector 3 through the first temperature sensor installed on the solar thermal collector 3 . When the inner surface temperature of the solar thermal collector 3 reaches the first preset threshold, the first circulating oil pump 2 is controlled to start running, so as to draw the thermal oil from the thermal oil tank 1 to the solar thermal collector 3 for heating. The temperature of the heat transfer oil in the solar heat collector 3 is acquired through the second temperature sensor installed inside the solar heat collector 3 , and when the temperature of the heat transfer oil in the solar heat collector 3 does not reach the second preset threshold, the first temperature sensor is controlled. The circulating oil pump 2 is stopped and started until the temperature of the heat transfer oil reaches the second preset threshold, and then the first circulating oil pump 2 is controlled to start running, and the heat transfer oil is delivered to the heat exchanger 5 .

Further, when the temperature of the solar thermal collector 3 is not greater than the first preset threshold, the PLC controller 120 controls the second circulating oil pump 6 to start running, so as to extract the heat-conducting oil from the heat-conducting oil tank 1 to the electric heater 7 . heating. Alternatively, within the preset time when the first circulating oil pump 2 starts to run, the first circulating oil pump 2 and the second circulating oil pump 6 are controlled to run simultaneously, so that the heat transfer oil is heated by the solar collector and the electric heater at the same time until the solar energy The temperature of the heat transfer oil in the heat collector reaches the second preset threshold.

In one embodiment, if the first preset threshold is 55 degrees Celsius, the second preset threshold is 150 degrees Celsius. When the inner surface temperature of the solar thermal collector reaches 55 degrees Celsius or higher, the PLC controller 120 sends a start instruction to the first circulating oil pump 2 , and the first circulating oil pump 2 extracts the heat transfer oil in the heat transfer oil tank 1 into the solar heat collector 3 Heating is performed, and then the operation of the first circulating oil pump 2 is suspended, so that the heat transfer oil is continuously heated in the solar heat collector 3 . After heating the heat transfer oil to above 150 degrees Celsius, the PLC controller 120 continues to run the first circulating oil pump 2 to pump the heat transfer oil into the heat exchanger 5 . If the current temperature of the inner surface of the solar heat collector 3 does not reach 55 degrees Celsius, the second circulating oil pump 6 is controlled to operate, and the heat transfer oil in the heat transfer oil tank 1 is extracted into the electric heater 7 for heating, and then sent to the heat exchanger. 5 in. In order to save the time wasted by the solar heat collector 3 heating the heat transfer oil to 120 degrees Celsius, before the solar heat collector 3 heats the heat transfer oil to 120 degrees Celsius, the first circulating oil pump 2 and the second circulating oil pump 6 can be controlled to run at the same time until The solar collector 3 heats the heat transfer oil to above 120 degrees Celsius, and controls the second circulating oil pump 6 to stop running.

Further, the chemical plant water circulation control device 100 acquires the water level in the steam generator 4 through the liquid level sensor installed in the steam generator 4 . When the water level of the steam generator 4 is lower than the third preset threshold, the PLC controller 120 controls the rainwater purification device valve 20 of the rainwater purification device 19 to open, and injects purified rainwater into the steam generator 4 . After the rainwater is injected, if the water level in the steam generator 4 is still lower than the third preset threshold, the valve 22 of the backup water storage tank 21 is controlled to open, and the backup water is injected into the steam generator 4 until the steam generator 4 The water level reaches the preset stop filling height.

In one embodiment, if the third preset threshold is 3 meters, the preset stop water injection height is 6 meters. When the liquid level sensor detects that the water level in the steam generator 4 is lower than 3 meters, the valve 20 of the rainwater purification device is controlled to open, and water is injected into the steam generator 4 until the water level reaches 6 meters. If all the purified rainwater in the rainwater purification device 19 has been injected into the steam generator 4, but the water level in the steam generator is still lower than 3 meters, the valve 22 of the backup water storage tank is controlled to open, and the backup water source is injected into the steam generator 4, until the water level in the steam generator reaches 6 meters.

As a feasible implementation manner, the chemical plant water cycle control device 100 is associated with the ERP management system of the chemical plant, and obtains order information in the ERP management system. Then, the keywords in the order information are analyzed to obtain the task requirements of the order. If the task requirement of the order includes the steam usage requirement, obtain the time requirement of the steam usage requirement. According to the above time requirement, the operation of the first circulating oil pump 2 or the second circulating oil pump 6 is controlled in advance.

In one embodiment, if a commodity in the order information needs to be produced in a section using steam, the production time of the section is obtained, and the circulating oil pump is turned on a period of time before the production time. According to the temperature of the solar collector, it is determined whether the first circulating oil pump 2 or the second circulating oil pump 6 is turned on at the same time, and the heat transfer oil is preheated to save production time.

S302: The chemical plant water cycle control device 100 heats the water in the steam generator through the heat exchanger to generate steam.

Specifically, based on the steam usage law of each section that needs to use steam under the condition that the temperature is different and the rated steam consumption of the equipment does not pass, a steam consumption model of the steam generator 4 is established in the PLC controller 120 to predict the chemical industry at the current moment. The steam consumption of each steam section in the plant. Based on the steam consumption model, determine the current steam consumption of each section. When the amount of steam generated in the steam generator 4 reaches the amount of steam, the circulating oil pump is controlled to stop running.

As a feasible implementation, based on the rated steam consumption of the equipment in each section that needs to use steam and the influence of temperature on the steam consumption of the equipment, a mathematical model of steam consumption is established by nonlinear programming technology, and the current environment is input into the mathematical model. temperature, the predicted steam consumption of each section can be predicted, so as to obtain the total steam consumption of each section at the current moment. When the steam generation in the steam generator 4 has reached the total steam consumption, the circulating oil pump can be controlled to stop running. After the circulating oil pump stops running, the high-temperature heat transfer oil can still heat the water in the steam generator 4 for a period of time. A certain amount of steam, thus avoiding the situation of insufficient steam production due to prediction errors.

S303: The chemical plant circulation system transports the steam in the steam generator 4 to the section where the steam needs to be used through the steam pipeline; the used steam is collected and condensed through the condenser 9, and the condensed water in the condenser 9 is transported to cooling tower 13.

Specifically, the PLC controller 120 determines the heating month in the chemical plant in advance according to the altitude and geographic location of the location of the chemical plant or according to manually input information. When the circulation system of the chemical plant is running, the PLC controller 120 will determine whether the current month belongs to the heating month, and if it does not belong to the heating month, the first automatic valve of the control condenser 9 is opened and the second automatic valve is closed, that is, the first condenser The valve 10 is opened and the second condenser valve 12 is closed to convey the condensed water in the condenser 9 directly to the cooling tower 13 . If it belongs to the heating month, the first automatic valve of the control condenser 9 is closed and the second automatic valve is opened, that is, the first condenser valve 10 is closed and the second condenser valve 12 is opened, so as to convey the condensed water in the condenser 9 to the heating circuit 11.

In one embodiment, if a chemical plant is located in a northern region or an area with a higher altitude, and the heating months are October, November, December, January, February, March, and April, then during these months The PLC controller 120 determines that the current month belongs to the heating month according to the current month and the pre-stored heating month table, and controls the first condenser valve to close, the second condenser valve 12 to open, and the high temperature condensate generated in the condenser 9 to condense The water will be input into the heating circulation system 11 and mixed with the cold water in the system to obtain water of suitable temperature for heating.

S304: The chemical plant water circulation control device 100 controls the operation of the first water pump 15 based on the temperature in the cooling tower 13, so as to transport the cooling water in the cooling tower 13 to the industrial equipment 16 that needs water.

Specifically, the water temperature in the cooling tower 13 is obtained through the third temperature sensor installed in the cooling tower 13; when the water temperature in the cooling tower 13 is lower than the fifth preset threshold, the first water pump 15 is controlled to operate to The cooling water in cooling tower 13 is sent to industrial equipment 16 . In addition, the cooling tower not only contains the high-temperature condensed water sent from the condenser 9, but also receives the waste hot water generated by each section.

得到冷却塔出水管路中水的流量，其中，Q为流量，S为冷水塔出水管路的管长比阻。然后根据公式

得到冷却塔出水管中的流速，其中，V为流速，d为冷水塔出水管路的内径。Further, the PLC controller 120 collects the differential pressure P in the water outlet pipe of the cooling tower 13 through the differential pressure flowmeter 113 installed in the water outlet pipe of the cooling tower 13 . According to the formula

Obtain the flow rate of water in the outlet pipe of the cooling tower, where Q is the flow rate, and S is the pipe length specific resistance of the outlet pipe of the cold water tower. Then according to the formula

Obtain the flow velocity in the outlet pipe of the cooling tower, where V is the flow velocity, and d is the inner diameter of the outlet pipe of the cooling tower.

Further, compare the differential pressure, flow and flow velocity in the water outlet pipeline of the cooling tower 13 with the pre-stored differential pressure threshold, flow threshold and flow velocity threshold in the PLC controller 120, according to the actual differential pressure, flow, flow velocity exceeding the threshold or If it is lower than the threshold value, the output frequency of the frequency converter is adjusted to adjust the rotational speed of the motor of the first water pump 15 . Or, in response to the received frequency conversion command, a signal is sent to the frequency converter to adjust the output frequency of the frequency converter to adjust the rotational speed of the motor of the first water pump 15 .

S305: The chemical plant water circulation system collects the waste water generated by the industrial equipment 16 that requires water into the waste water treatment device 17 for processing through pipelines.

S306: After the water treatment in the wastewater treatment device 17 reaches the standard, the PLC controller controls the second water pump 18 to transport the treated wastewater into the steam generator 4, thereby completing the water recycling.

In addition, FIG. 4 is a schematic structural diagram of another chemical plant water cycle control device provided by an embodiment of the application. As shown in FIG. 4 , the chemical plant water cycle control device 400 includes at least one processor 401 ; and communicates with at least one processor 401 A connected memory 402; wherein the memory 402 stores instructions executable by the at least one processor 401, the instructions being executed by the at least one processor 401 to enable the at least one processor 401 to:

Based on the temperature of the solar collector, control the operation of the circulating oil pump, so that the heat transfer oil circulates between the solar collector and the heat exchanger, so as to heat the water in the steam generator through the heat exchanger to generate steam; The steam line transports the steam from the steam generator to the section where the steam needs to be used; the used steam is collected and condensed by the condenser, and the condensed water in the condenser is transported to the cooling tower; based on the temperature in the cooling tower , control the operation of the first water pump to transport the cooling water in the cooling tower to the industrial equipment that needs water; collect the wastewater generated by the industrial equipment that needs water into the wastewater treatment device through the pipeline for treatment; pass the second water pump to The treated wastewater is sent to the steam generator.

In the embodiment of the present application, the heat-conducting oil is heated by solar energy, and then the water is heated by the heat-conducting oil to generate steam, which saves energy. The used waste steam is not discharged into the air, but the steam is collected and condensed, and then the condensed water is reused in the heating system, or reused in the water equipment through cooling, and finally the purified wastewater is recycled The recycling of water resources is formed in the steam generator, which realizes the multi-use of one water, and saves the energy to the greatest extent, which is of great positive significance. In addition, the intelligent control of the water circulation system is realized through the control device controlling the valve, water pump or oil pump in the whole process, which can realize automatic operation or manual control of each node. The control modes are various, and the user experience is greatly improved.

Each embodiment in this application is described in a progressive manner, and the same and similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the apparatus, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for related parts.

The foregoing describes specific embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that in the embodiments and still achieve desirable results. Additionally, the processes depicted in the figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

The above descriptions are merely examples of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and variations can be made to the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included within the scope of the claims of the present application.

Claims (8)

1. A method for controlling water circulation in a chemical plant, the method comprising:

controlling a circulating oil pump to operate based on the temperature of the solar thermal collector so that heat conducting oil circularly flows between the solar thermal collector and a heat exchanger, and heating water in a steam generator through the heat exchanger to generate steam;

conveying the steam in the steam generator to a section needing to use the steam through a steam pipeline;

the method comprises the following steps of collecting used steam through a condenser, condensing the steam, and conveying condensed water in the condenser to a cooling tower, and specifically comprises the following steps:

determining a heating month based on the altitude and the geographical position of the location of the chemical plant;

if the current month does not belong to the heating month, controlling a first automatic valve of the condenser to be opened and a second automatic valve of the condenser to be closed so as to convey the condensed water in the condenser to a cooling tower;

if the current month belongs to the heating month, controlling a first automatic valve of the condenser to be closed and a second automatic valve of the condenser to be opened so as to convey the condensed water in the condenser to a heating circulating system;

controlling a first water pump to operate based on the temperature in the cooling tower to deliver the cooling water in the cooling tower to an industrial facility requiring water;

collecting the pressure difference in the water outlet pipe of the cooling tower through a pressure difference flowmeter arranged in the water outlet pipe of the cooling tower;

determining the flow in the cooling tower water outlet pipe based on the pressure difference and the pipe length specific resistance of the cooling tower water outlet pipe;

determining the flow velocity in the cooling tower water outlet pipe based on the flow and the inner diameter of the cooling tower water outlet pipe;

adjusting the output frequency of a frequency converter based on the pressure difference, the flow and the flow speed to adjust the rotating speed of the first water pump motor; or responding to the received frequency conversion instruction, sending a signal to a frequency converter, and adjusting the output frequency of the frequency converter so as to adjust the rotating speed of the first water pump motor;

collecting the wastewater generated by the industrial equipment needing water into a wastewater treatment device through a pipeline for treatment;

and conveying the treated wastewater into the steam generator through a second water pump.

2. The chemical plant water circulation control method according to claim 1, wherein the circulating oil pump is controlled to operate based on the temperature of the solar thermal collector so that the heat transfer oil circularly flows between the solar thermal collector and the heat exchanger, and specifically comprises:

acquiring the temperature of a solar heat collector through a first temperature sensor arranged on the solar heat collector;

under the condition that the temperature of the solar thermal collector reaches a first preset threshold value, controlling a first circulating oil pump to start running so as to pump heat conduction oil into the solar thermal collector in a heat conduction oil tank for heating;

acquiring the temperature of heat conducting oil in the solar heat collector through a second temperature sensor arranged in the solar heat collector;

under the condition that the temperature of the heat conduction oil in the solar heat collector reaches a second preset threshold value, controlling the first circulating oil pump to convey the heat conduction oil in the solar heat collector to the heat exchanger; wherein the heat exchanger is disposed in the steam generator.

3. The chemical plant water circulation control method according to claim 2, further comprising:

under the condition that the temperature of the solar heat collector is not greater than a first preset threshold value, controlling a second circulating oil pump to start to operate so as to pump heat conduction oil into the heat conduction oil box to be heated in the electric heater; or,

and controlling the first circulating oil pump and the second circulating oil pump to simultaneously operate within the preset time when the first circulating oil pump starts to operate, so that the heat conduction oil is simultaneously heated by the solar heat collector and the electric heater until the temperature of the heat conduction oil in the solar heat collector reaches the second preset threshold value.

4. The chemical plant water circulation control method according to claim 1, wherein before the water in the steam generator is heated by the heat exchanger to generate steam, the method further comprises:

acquiring a water level in a steam generator through a liquid level sensor installed in the steam generator;

controlling a rainwater purification device to inject purified rainwater into the steam generator under the condition that the water level of the steam generator is smaller than a third preset threshold;

and under the condition that the water level of the steam generator is still smaller than the third preset threshold after rainwater is injected, controlling the standby water storage tank to inject water into the steam generator until the water level of the steam generator reaches a preset water injection stopping height.

5. The chemical plant water circulation control method according to claim 1, wherein the step of heating the water in the steam generator by the heat exchanger to generate steam specifically comprises the following steps:

establishing a steam usage model of the steam generator based on a steam usage rule of each section needing to use steam; wherein the influence factors of the steam use rule at least comprise one or more of the following factors: temperature factors and equipment rated steam consumption factors;

determining the steam consumption of each current working section based on the steam consumption model;

and controlling the circulating oil pump to stop running under the condition that the steam generation amount in the steam generator reaches the steam consumption.

6. The method as claimed in claim 1, wherein the step of controlling the operation of the first water pump based on the temperature in the cooling tower to deliver the cooling water in the cooling tower to the industrial equipment requiring water comprises:

acquiring the water temperature in a cooling tower through a third temperature sensor arranged in the cooling tower;

under the condition that the water temperature in the cooling tower is lower than a fifth preset threshold value, controlling a first water pump to operate so as to convey cooling water in the cooling tower to each industrial device; wherein, the cooling tower comprises the condensed water and waste hot water generated by other water-using equipment.

7. The method for controlling water circulation in a chemical plant according to claim 1, wherein before controlling the operation of the circulating oil pump to circulate the heat transfer oil between the solar thermal collector and the heat exchanger based on the temperature of the solar thermal collector, the method further comprises:

associating with an ERP management system of a chemical plant, and acquiring order information in the ERP management system;

analyzing the keywords in the order information to obtain the task requirements of the order;

if the task requirement comprises a steam use requirement, acquiring a time requirement in the task requirement;

and controlling the circulating oil pump to operate in advance according to the time requirement.

8. A chemical plant water circulation control apparatus, characterized in that the apparatus comprises:

at least one processor; and the number of the first and second groups,

a memory communicatively coupled to the at least one processor; wherein,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a method of controlling water circulation in a chemical plant according to any one of claims 1 to 7.

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