Intelligent ventilation control system for steam engine room of thermal power plant

Abstract

The invention belongs to the technical field of intelligent control, and provides an intelligent ventilation control system for a steam engine room of a thermal power plant, which comprises an environment monitoring assembly, a central processing unit, a roof fan control assembly and a circulating temperature regulation control assembly, the environment monitoring assembly is used for collecting environment data in the steam engine room. The central processing unit is used for determining the target state of each roof fan according to the environment data and generating a first control instruction to the roof fan control assembly; according to the environment data and season information obtained in advance, the target state of each circulating temperature adjusting unit is determined, and a second control instruction is generated and sent to the circulating temperature adjusting control assembly; the roof fan control assembly is used for controlling each roof fan to operate according to the corresponding target state; the circulating temperature adjusting control assembly is used for controlling all the circulating temperature adjusting units to operate according to the corresponding target states. According to the scheme, intelligent management of the environment of the steam engine room is realized, and the collaboration and accuracy of the ventilation control link of the steam engine room are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent control, and particularly relates to an intelligent ventilation control system for a steam turbine building of a thermal power plant. BACKGROUND

[0002] The steam turbine building of a thermal power plant is one of the core areas of the thermal power plant, and a large amount of heat is generated when the internal equipment is running, and there are safety hazards such as hydrogen leakage, so an effective ventilation system is needed to ensure the normal operation of the equipment and the safety of personnel.

[0003] In the related art, the traditional ventilation mode of the steam turbine building of a thermal power plant mainly has the following forms: one is to set a wind guide pipe in the steam turbine building to connect the running layer and the bottom layer, and set an air inlet pipe and a fan in the bottom layer and the running layer respectively to realize the switching of the ventilation mode in different seasons; the other is to introduce fresh air from outside the steam turbine building through a closed pipe, and exhaust indoor polluted air through an air extractor. However, on the one hand, the traditional steam turbine building ventilation system mainly adopts a single ventilation mode, which cannot automatically adjust the ventilation strategy according to the change of environmental parameters, resulting in poor ventilation effect. Especially in summer or winter, it is difficult to effectively adjust the internal temperature of the steam turbine building by relying on the roof fan alone, which affects the equipment operation efficiency and service life. On the other hand, the existing ventilation system lacks coordination between components, and the roof fan, doors and windows and other equipment often run independently, lack unified intelligent control strategy, and it is difficult to achieve optimal ventilation effect and energy utilization efficiency.

[0004] Therefore, the traditional ventilation mode of the steam turbine building of a thermal power plant has the technical problems of low control precision, poor coordination effect and low intelligent degree, and it is difficult to meet the intelligent management requirements of the steam turbine building environment, and the safe operation of the equipment and the efficient use of energy. SUMMARY

[0005] The present application provides an intelligent ventilation control system for a steam turbine building of a thermal power plant to solve the defects of low control precision, poor coordination effect and low intelligent degree of the traditional ventilation mode of the steam turbine building of a thermal power plant.

[0006] The application provides an intelligent ventilation control system for a steam turbine room of a thermal power plant, the top of the steam turbine room is provided with a plurality of roof fans, and the two sides of the steam turbine room are provided with a plurality of circulating temperature regulating units; the system comprises an environment monitoring assembly, a central processor, a roof fan control assembly and a circulating temperature regulating control assembly; the environment monitoring assembly is used for collecting environment data in the steam turbine room; the central processor is used for determining a target state of each roof fan according to the environment data, and generating a first control instruction to the roof fan control assembly according to the target state of each roof fan; determining a target state of each circulating temperature regulating unit according to the environment data and pre-obtained seasonal information, and generating a second control instruction to the circulating temperature regulating control assembly according to the target state of each circulating temperature regulating unit; the roof fan control assembly is used for controlling each roof fan to operate according to the corresponding target state after receiving the first control instruction; and the circulating temperature regulating control assembly is used for controlling each circulating temperature regulating unit to operate according to the corresponding target state after receiving the second control instruction.

[0007] Preferably, the environment data comprises a turbine room temperature and a hydrogen concentration in the steam turbine room; the central processor is used for determining the target state of each roof fan according to the environment data, comprising: comparing the turbine room temperature with a plurality of preset temperature intervals respectively to determine a target temperature interval to which the turbine room temperature belongs; calling a pre-set first reference table to determine a first reference state set of each roof fan corresponding to the target temperature interval according to the first reference table; wherein the first reference table is used to represent the corresponding relationship between different temperature intervals and the reference state of each roof fan; comparing the hydrogen concentration with a plurality of preset concentration intervals to determine a target concentration interval to which the hydrogen concentration belongs; calling a pre-set second reference table to determine a second reference state set of each roof fan corresponding to the target concentration interval according to the second reference table; wherein the second reference table is used to represent the corresponding relationship between different concentration intervals and the reference state of each roof fan; performing a set operation on the first reference state set and the second reference state set to obtain the target state of each roof fan.

[0008] Further, the roof fan control assembly comprises a plurality of fan control cabinets and a plurality of electric signal detection assemblies; the roof fans are one-to-one corresponding to the fan control cabinets and the electric signal detection assemblies, and the fan control cabinets are connected with the roof fans and the electric signal detection assemblies respectively; the electric signal detection assemblies are used for collecting key electric parameters of the corresponding roof fans and sending the key electric parameters to the fan control cabinets; and the fan control cabinets are used for controlling the corresponding roof fans to operate according to the corresponding target state after receiving the first control instruction, and generating and sending an abnormal warning information to the central processor when determining that the key electric parameters are abnormal.

[0009] Preferably, each circulating temperature regulating unit comprises a circulating water assembly, a cooling fan and an electric valve; the circulating water assembly is used to access lithium bromide chilled water or heating water; the cooling fan is connected to the main pipeline of the circulating water assembly through a branch pipeline; the electric valve is installed on the main pipeline of the circulating water assembly and is used to control the water passage of the circulating water assembly.

[0010] Further, the environmental data comprises the temperature of the machine room; according to the environmental data and pre-obtained seasonal information, the target state of each circulating temperature regulating unit is determined, including: when the seasonal information is summer and the temperature of the machine room is higher than a first temperature threshold, the target state of each circulating temperature regulating unit is determined as accessing lithium bromide chilled water to the circulating water assembly, and the electric valve and the cooling fan are turned on until the temperature of the machine room is lower than a second temperature threshold, the target state of each circulating temperature regulating unit is determined as closing the electric valve and the cooling fan; when the seasonal information is winter and the temperature of the machine room is lower than a third temperature threshold, the target state of each circulating temperature regulating unit is determined as accessing heating water to the circulating water assembly, and the electric valve and the cooling fan are turned on until the temperature of the machine room is higher than a fourth temperature threshold, the target state of each circulating temperature regulating unit is determined as closing the electric valve and the cooling fan; wherein the first temperature threshold, the second temperature threshold, the fourth temperature threshold and the third temperature threshold decrease in turn.

[0011] Preferably, the steam engine room is also provided with a plurality of electric doors and windows, and the system further comprises an electric door and window control assembly; the electric door and window control assembly is connected to the central processor; the central processor is further used to determine the target state of each electric door and window according to the environmental data and the target state of each roof fan, and generate and send a third control instruction to the electric door and window control assembly according to the target state of each electric door and window; the electric door and window control assembly is used to control each electric door and window to act according to the corresponding target state after receiving the third control instruction.

[0012] Further, the environment data comprises: a machine room pressure and a hydrogen concentration; and the central processor determines a target state of each electric door / window according to the environment data and the target state of each roof fan, comprising: comparing the machine room pressure with a preset pressure threshold to obtain a first comparison result; comparing the hydrogen concentration with a preset concentration threshold to obtain a second comparison result; determining a target deviation value according to the first comparison result and the second comparison result; determining an opening / closing state of each electric door / window according to the target deviation value; determining a number of roof fans in the target state of opening according to the target state of each roof fan; determining a target electric door / window in the opening / closing state of opening, and determining an opening degree of the target electric door / window according to the number of roof fans in the target state of opening; and obtaining the target state of each electric door / window according to the opening / closing state of each electric door / window and the opening degree of the target electric door / window.

[0013] Preferably, determining the target deviation value according to the first comparison result and the second comparison result comprises: if the first comparison result is that the machine room pressure is higher than the preset pressure threshold and the second comparison result is that the hydrogen concentration is below the preset concentration threshold, then the target deviation value is obtained by subtracting the preset pressure threshold from the machine room pressure; if the second comparison result is that the hydrogen concentration is higher than the preset concentration threshold, then the target deviation value is obtained by subtracting the preset concentration threshold from the hydrogen concentration; and if the first comparison result is that the machine room pressure is below the preset pressure threshold and the second comparison result is that the hydrogen concentration is below the preset concentration threshold, then the target deviation value is set as a default value.

[0014] Further, determining the opening / closing state of each electric door / window according to the target deviation value comprises: calling a third comparison table established in advance; wherein the third comparison table is used to represent a corresponding relationship between different target deviation values and the opening / closing state of each electric door / window; and determining the opening / closing state of each electric door / window corresponding to the target deviation value according to the third comparison table.

[0015] Preferably, the environment monitoring assembly comprises: a temperature monitoring device, a pressure monitoring device, and a hydrogen monitoring device; the temperature monitoring device is used to collect a machine room temperature in a steam turbine room; the pressure monitoring device is used to collect a machine room pressure in the steam turbine room; and the hydrogen monitoring device is used to collect a hydrogen concentration in the steam turbine room.

[0016] The beneficial effects of the present application are that: by setting the environment monitoring component, the central processor, the roof fan control component and the circulating temperature control component, the intelligent management of the steam turbine room environment is realized, and the problem of low intelligent degree in the traditional steam turbine room ventilation scheme is solved; through the collaborative work of each part, multiple adjustment methods including roof fan control and cooling fan control are provided, the collaboration and accuracy of the steam turbine room ventilation control link are improved; at the same time, the personnel operation comfort is improved, the working environment is improved, and the equipment operation safety in the steam turbine room is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is the overall structure block diagram of the intelligent ventilation control system for the steam turbine room of the power plant provided by the embodiment of the present application;

[0019] Figure 2 is the partial structure schematic diagram of the intelligent ventilation control system for the steam turbine room of the power plant provided by the embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present application more clear, the technical solutions in the present application will be described clearly and completely in the following with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0021] The details of the intelligent ventilation control system for the steam turbine room of the power plant provided by the embodiment of the present application will be described in the following with reference to the drawings. Figure 1 and Figure 2 The details of the intelligent ventilation control system for the steam turbine room of the power plant provided by the embodiment of the present application will be described in the following with reference to the drawings.

[0022] As Figure 1 shown, the embodiment of the present application provides an intelligent ventilation control system for the steam turbine room of the power plant, the top of the steam turbine room is provided with a plurality of roof fans, and the two sides of the steam turbine room are provided with a plurality of circulating temperature units; the system specifically comprises: an environment monitoring component 110, a central processor 120, a roof fan control component 130 and a circulating temperature control component 140.

[0023] The environment monitoring component 110 is used for collecting the environment data in the steam turbine room.

[0024] The central processing unit 120 is used to determine the target state of each roof fan based on the environmental data, and generate a first control instruction to the roof fan control component 130 based on the target state of each roof fan; the central processing unit 120 is also used to determine the target state of each circulation temperature control unit based on the environmental data and pre-acquired seasonal information, and generate a second control instruction to the circulation temperature control component 140 based on the target state of each circulation temperature control unit.

[0025] The roof fan control component 130 is used to control each roof fan to operate according to its corresponding target state after receiving the first control instruction.

[0026] The circulation temperature control component 140 is used to control each circulation temperature control unit to operate according to its corresponding target state after receiving the second control instruction.

[0027] In one embodiment, if Figure 2 As shown, the environmental monitoring assembly 110 specifically includes a temperature monitoring device 210, a pressure monitoring device 220, and a hydrogen monitoring device 230. The temperature monitoring device 210 is used to collect the room temperature within the turbine room 200, the pressure monitoring device 220 is used to collect the room pressure within the turbine room 200, and the hydrogen monitoring device 230 is used to collect the hydrogen concentration within the turbine room 200.

[0028] In practical applications, the temperature monitoring device can use a PT100 platinum resistance temperature sensor with a measurement range of -50°C to 150°C and an accuracy of ±0.1°C. The temperature monitoring device can evenly distribute multiple temperature measurement points within the turbine room. For example, eight temperature measurement points can be arranged at the four corners and the midpoints of the four sides of the turbine room. The temperature data obtained from these multiple temperature measurement points is then averaged to obtain the room temperature, ensuring the accuracy and representativeness of the collected room temperature.

[0029] The pressure monitoring device can use a differential pressure sensor with a measurement range of -500Pa to 500Pa and an accuracy of ±1Pa. The pressure monitoring device can be installed at multiple pressure measurement points within the turbine room. For example, four pressure measurement points can be set up, located at the center of each of the four sides of the turbine room, to monitor the turbine room pressure. In actual applications, the pressure data obtained from multiple pressure measurement points can be averaged to obtain the turbine room pressure.

[0030] The hydrogen monitoring device can use a catalytic combustion hydrogen detector with a measurement range of 0 to 4% volume concentration and an accuracy of ±0.01%. The hydrogen monitoring device can be set up at multiple detection points within the turbine room. For example, six detection points can be set up, mainly distributed around the generator sets and in the turbine room roof area, which are key locations where hydrogen may leak or accumulate.

[0031] The central processing unit (CPU) can be an industrial-grade programmable controller (PLC), offering high reliability and anti-interference capabilities. The CPU is equipped with a dual-redundant power supply system to ensure normal system operation even in the event of a single power failure. The CPU also includes a built-in real-time operating system (RTOS) to meet the system's data processing and storage requirements.

[0032] In one embodiment, the environmental data includes the turbine room temperature and hydrogen concentration in the turbine room. The process by which the central processor determines the target state of each rooftop fan based on the environmental data is as follows:

[0033] First, the central processing unit compares the temperature of the computer room with multiple preset temperature ranges to determine the target temperature range to which the temperature of the computer room belongs.

[0034] In this embodiment, the preset temperature ranges specifically include: a low temperature range (below 20°C), a normal temperature range (20°C to 30°C), a high temperature range (30°C to 40°C) and an ultra-high temperature range (above 40°C).

[0035] Then, the central processing unit retrieves a pre-set first comparison table and determines a first reference state set for each roof fan corresponding to the target temperature range based on the first comparison table. The first comparison table is used to represent the correspondence between different temperature ranges and the reference states of each roof fan.

[0036] like Figure 2 As shown, four roof fans may be set, namely, roof fan No. 1 240 , roof fan No. 2 250 , roof fan No. 3 260 and roof fan No. 4 270 .

[0037] For example, when the temperature in the computer room is 35°C, it belongs to the high temperature range (30°C to 40°C). According to the first comparison table, the corresponding first reference state set is: roof fan No. 1 is turned on and runs at 80% speed, roof fan No. 2 is turned on and runs at 80% speed, roof fan No. 3 is turned on and runs at 60% speed, and roof fan No. 4 is turned on and runs at 60% speed.

[0038] The central processing unit then compares the hydrogen concentration with multiple preset concentration ranges to determine the target concentration range within which the hydrogen concentration falls. These ranges include: safe range (0 to 0.5% volume concentration), warning range (0.5% to 1% volume concentration), dangerous range (1% to 2% volume concentration), and emergency range (above 2% volume concentration).

[0039] The central processing unit then retrieves a pre-set second comparison table and determines a second reference state set for each rooftop fan corresponding to the target concentration range based on the second comparison table. The second comparison table is used to represent the correspondence between different concentration ranges and the reference states of each rooftop fan.

[0040] For example, when the hydrogen concentration is 0.7%, which belongs to the warning interval (0.5% to 1% by volume), according to the second control table, the corresponding second reference state set is: the No. 1 roof fan is started and runs at 100% speed, the No. 2 roof fan is started and runs at 100% speed, the No. 3 roof fan is started and runs at 80% speed, and the No. 4 roof fan is started and runs at 80% speed.

[0041] Finally, the central processor performs a union operation on the first reference state set and the second reference state set to obtain the target state of each roof fan.

[0042] In this embodiment, the rule of the union operation is: for the same roof fan, if it is in the on state in both reference state sets, the higher speed value is taken; if it is in the on state in any reference state set, the target state is the on state and the corresponding speed value is adopted.

[0043] According to the above example, after the union operation, the target state obtained is: the No. 1 roof fan is started and runs at 100% speed, the No. 2 roof fan is started and runs at 100% speed, the No. 3 roof fan is started and runs at 80% speed, and the No. 4 roof fan is started and runs at 80% speed.

[0044] In an embodiment, the roof fan control assembly specifically includes: a plurality of fan control cabinets and a plurality of electrical signal detection assemblies.

[0045] Among them, the roof fan is one-to-one corresponding to the fan control cabinet and the electrical signal detection assembly, and the fan control cabinet is connected with the roof fan and the electrical signal detection assembly respectively.

[0046] The fan control cabinet adopts a steel plate structure with an IP54 protection level, and is internally installed with electrical elements such as frequency converters, contactors, circuit breakers, etc. The frequency converter adopts a vector control type frequency converter with a power range of 5.5kW to 22kW, which is suitable for roof fans of different power. The contactor adopts an AC contactor with a rated current of 32A and has an overload protection function. The circuit breaker adopts a molded case circuit breaker with a rated current of 63A and has a short circuit protection function.

[0047] The electrical signal detection assembly is used to collect key electrical parameters of the corresponding roof fan and send the key electrical parameters to the fan control cabinet. The electrical signal detection assembly includes current transformers, voltage transformers, and power analyzers. The current transformer has a transformation ratio of 100 / 5A and an accuracy level of 0.5. The voltage transformer has a transformation ratio of 380 / 100V and an accuracy level of 0.5. The power analyzer can measure parameters such as current, voltage, power factor, active power, and reactive power, with an accuracy of ±0.2%.

[0048] Key electrical parameters include motor current, motor voltage, power factor, and bearing temperature. The normal range of motor current is 60% to 110% of the rated current, the normal range of motor voltage is 90% to 110% of the rated voltage, the normal range of power factor is 0.8 to 1.0, and the normal range of bearing temperature is -20°C to 80°C.

[0049] Upon receiving the first control command, the fan control cabinet controls the corresponding rooftop fan to operate according to the corresponding target state. When an abnormality is detected in a key electrical parameter, the cabinet generates and sends an abnormality warning message to the central processing unit. The abnormality warning message includes information such as the abnormality type, abnormal value, and abnormal time.

[0050] For example, if the motor current of rooftop fan No. 1 exceeds 120% of its rated current, the fan control cabinet generates an abnormal warning message, "Rooftop fan No. 1 motor current is too high," and sends this warning message to the central processing unit. Upon receiving the abnormal warning message, the central processing unit displays a warning message on the system monitoring interface and automatically adjusts the operating status of related equipment according to the preset emergency response strategy to ensure safe system operation.

[0051] In some embodiments, such as Figure 2 As shown, a circulating temperature control unit can be installed on each side of the turbine room. Arrows indicate the direction of water flow. Each circulating temperature control unit includes a circulating water assembly 280, a cooling fan 290, and an electric valve 2100. The circulating water assembly 280 receives lithium bromide chilled water or heating water. The cooling fan 290 is connected to the main line of the circulating water assembly 280 via a branch pipe. The electric valve 2100 is installed on the main line of the circulating water assembly 280 and controls the flow of the circulating water assembly 280.

[0052] In this embodiment, the circulating water assembly consists of a main pipe, branch pipes, a heat exchanger, etc. The main pipe adopts DN100 seamless steel pipe, the branch pipe adopts DN50 seamless steel pipe, and the heat exchanger adopts a copper tube aluminum fin structure.

[0053] The cooling fan adopts axial flow fan with air volume of 10000m 3 / h, static pressure is 150Pa, and motor power is 1.5kW. The cooling fan can be connected to the branch pipe through a flange, and a regulating valve can be set on the branch pipe to adjust the amount of water passing through the cooling fan.

[0054] In one embodiment, the environmental data includes the temperature of the computer room. The central processor determines the target state of each circulating temperature control unit based on the environmental data and pre-acquired seasonal information as follows:

[0055] When the season information is summer and the machine room temperature is higher than the first temperature threshold, the target state of each circulating temperature regulating unit is determined as connecting the lithium bromide chilled water to the circulating water assembly, and the electric valve and the cooling fan are turned on until the machine room temperature is lower than the second temperature threshold, and the target state of each circulating temperature regulating unit is determined as closing the electric valve and the cooling fan.

[0056] When the season information is winter and the machine room temperature is lower than the third temperature threshold, the target state of each circulating temperature regulating unit is determined as connecting the heating water to the circulating water assembly, and the electric valve and the cooling fan are turned on until the machine room temperature is higher than the fourth temperature threshold, and the target state of each circulating temperature regulating unit is determined as closing the electric valve and the cooling fan.

[0057] The first temperature threshold can be set to 28℃, the second temperature threshold can be set to 25℃, the fourth temperature threshold can be set to 18℃, and the third temperature threshold can be set to 15℃.

[0058] For example, in summer, when the machine room temperature rises to 29℃, which exceeds the first temperature threshold 28℃, the central processor determines that the target state of the circulating temperature regulating unit is to connect the lithium bromide chilled water to the circulating water assembly, and the electric valve and the cooling fan are turned on. With the operation of the cooling system, the temperature of the machine room gradually decreases, and when the temperature decreases to 24℃, which is lower than the second temperature threshold 25℃, the central processor determines that the target state of the circulating temperature regulating unit is to close the electric valve and the cooling fan.

[0059] In winter, when the machine room temperature decreases to 14℃, which is lower than the third temperature threshold 15℃, the central processor determines that the target state of the circulating temperature regulating unit is to connect the heating water to the circulating water assembly, and the electric valve and the cooling fan are turned on. With the operation of the heating system, the temperature of the machine room gradually increases, and when the temperature increases to 19℃, which is higher than the fourth temperature threshold 18℃, the central processor determines that the target state of the circulating temperature regulating unit is to close the electric valve and the cooling fan.

[0060] In practical applications, the circulating temperature regulating control assembly can include multiple temperature regulating control cabinets, each of which corresponds to control one circulating temperature regulating unit. The temperature regulating control cabinet is installed with programmable controllers, relays, contactors and other electrical elements for receiving and executing the second control instructions issued by the central processor.

[0061] In some embodiments, the steam machine room is also installed with multiple electric doors and windows, and the system provided in the embodiment can further include an electric door and window control assembly.

[0062] The electric door and window control assembly is connected to the central processor. In practical applications, the electric door and window can adopt an aluminum alloy frame structure, the door and window panel can adopt tempered glass or aluminum alloy louvers, the driving mode can be electric chain type or electric push rod type, and the adjustable opening angle range can be 0° to 90°.

[0063] The central processor is further configured to determine a target state of each electric door / window according to the environment data and the target state of each roof fan, and generate and send a third control instruction to the electric door / window control assembly according to the target state of each electric door / window. The electric door / window control assembly is configured to control each electric door / window to act according to the corresponding target state after receiving the third control instruction.

[0064] In an embodiment, the environment data specifically includes the pressure in the machine room and the hydrogen concentration. The central processor determines the target state of each electric door / window according to the environment data and the target state of each roof fan, specifically as follows:

[0065] Firstly, the central processor compares the pressure in the machine room with a preset pressure threshold to obtain a first comparison result. The preset pressure threshold can be set to 50 Pa, representing the positive pressure value of the internal environment of the steam machine room relative to the external environment.

[0066] Then, the central processor compares the hydrogen concentration with a preset concentration threshold to obtain a second comparison result. The preset concentration threshold can be set to 0.4% by volume, which is one-tenth of the lower limit of hydrogen explosion (4% by volume), and has sufficient safety margin.

[0067] Next, the central processor determines a target deviation value according to the first comparison result and the second comparison result. The process of determining the target deviation value is specifically as follows:

[0068] If the first comparison result is that the pressure in the machine room is higher than the preset pressure threshold, and the second comparison result is that the hydrogen concentration is below the preset concentration threshold, then the pressure in the machine room is subtracted from the preset pressure threshold to obtain the target deviation value. For example, when the pressure in the machine room is 70 Pa and the preset pressure threshold is 50 Pa, the target deviation value is 20 Pa.

[0069] If the second comparison result is that the hydrogen concentration is higher than the preset concentration threshold, then the hydrogen concentration is directly subtracted from the preset concentration threshold to obtain the target deviation value. At this time, since the processing priority corresponding to the abnormal hydrogen concentration is higher, if the hydrogen concentration exceeds the preset concentration threshold, the target deviation value is determined based on the hydrogen concentration regardless of whether the pressure in the machine room is out of limit. For example, when the hydrogen concentration is 0.6% and the preset concentration threshold is 0.4%, the target deviation value is 0.2%. In order to unify the unit, the system will convert 0.2% into the corresponding pressure value, assuming that the conversion coefficient is 100 Pa / %, then the target deviation value is 20 Pa.

[0070] If the first comparison result is that the pressure in the machine room is below the preset pressure threshold, and the second comparison result is that the hydrogen concentration is below the preset concentration threshold, then the target deviation value is set to a default value. The default value is 0 Pa, indicating that no additional ventilation measures are needed.

[0071] Then, the central processing unit determines the open / closed state of each electric door / window based on the target deviation value. In actual application, the process of determining the open / closed state is as follows:

[0072] The central processing unit retrieves a pre-established third comparison table, which is used to represent the corresponding relationship between different target deviation values ​​and the opening and closing states of each electric door and window.

[0073] like Figure 2 As shown, four electric doors and windows can be set, namely electric door and window No. 1 2110 , electric door and window No. 2 2120 , electric door and window No. 3 2130 and electric door and window No. 4 2140 .

[0074] The target deviation value is determined based on the third comparison table to determine the open / closed state of each electric door and window. For example, if the first comparison result indicates that the machine room pressure is above the preset pressure threshold, and the second comparison result indicates that the hydrogen concentration is below the preset concentration threshold, and the target deviation value is 20 Pa, the corresponding open / closed states according to the third comparison table are: electric door and window No. 1 is open, electric door and window No. 2 is open, electric door and window No. 3 is closed, and electric door and window No. 4 is closed.

[0075] Next, the CPU determines the number of roof fans with a target state of on based on the target state of each roof fan. For example, if the target state of roof fans 1 and 2 is on, and the target state of roof fans 3 and 4 is off, then the number of roof fans with a target state of on is two.

[0076] The central processing unit then determines the target electric windows and doors that are in the open state, and determines the target opening degrees of the electric windows and doors based on the number of roof fans in the open state. For example, if the target electric windows and doors that are in the open state are electric windows 1 and 2, and the number of roof fans in the open state is two, the opening degrees of both electric windows 1 and 2 are determined to be 60% based on the preset correspondence.

[0077] Finally, the CPU calculates the target state for each power window based on the window's open / closed state and the target window opening. For example, the target state for power window 1 is open at 60%, the target state for power window 2 is open at 60%, and the target states for power windows 3 and 4 are both closed.

[0078] In an embodiment, the electric door and window control assembly comprises a plurality of door and window controllers, each of which corresponds to control an electric door and window. The door and window controller is built-in with a microprocessor and a driving circuit, can receive the third control instruction sent by the central processor, and control the electric door and window to act according to the target state. The door and window controller is also equipped with a position sensor for detecting the actual position of the electric door and window, so as to realize accurate position control.

[0079] To sum up, the intelligent ventilation control system for the steam turbine house of the thermal power plant provided by the embodiment of the present application realizes intelligent management of the environment of the steam turbine house by setting the environment monitoring assembly, the central processor, the roof fan control assembly and the circulating temperature control assembly, solves the problem of excessively high temperature in the traditional steam turbine house, provides multiple adjustment means including roof fan control, cooling fan control and electric door and window control through collaborative work of multiple subsystems, overcomes the single drawback of the traditional adjustment means, automatically opens the roof fan and the electric door and window to forcibly ventilate when the hydrogen concentration exceeds the safety threshold through real-time monitoring of the hydrogen concentration in the steam turbine house by the hydrogen leakage monitoring device, effectively solves the problem of prominent safety hazards, maintains the micro-negative pressure state of the machine room, prevents harmful gas accumulation, guarantees the ventilation effect and personnel safety, improves the personnel operation comfort, improves the working environment, enhances the equipment operation safety, and prolongs the service life of the equipment.

[0080] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An intelligent ventilation control system for a steam turbine building of a thermal power plant, characterized in that, The top of the steam engine room is provided with a plurality of roof fans, and the two sides of the steam engine room are provided with a plurality of circulating temperature regulating units; the system comprises an environment monitoring assembly, a central processor, a roof fan control assembly and a circulating temperature regulating control assembly; The environment monitoring assembly is used to collect environment data in the steam engine room; The central processor is used to determine the target state of each roof fan according to the environment data, and generate a first control instruction to the roof fan control assembly according to the target state of each roof fan; determine the target state of each circulating temperature regulating unit according to the environment data and the pre-obtained seasonal information, and generate a second control instruction to the circulating temperature regulating control assembly according to the target state of each circulating temperature regulating unit; The roof fan control assembly is used to control each roof fan to operate according to the corresponding target state after receiving the first control instruction; The circulating temperature regulating control assembly is used to control each circulating temperature regulating unit to operate according to the corresponding target state after receiving the second control instruction.

2. The intelligent ventilation control system for the steam turbine building of a thermal power plant as claimed in claim 1 wherein, The environment data comprises engine room temperature and hydrogen concentration in the steam engine room; The central processor is used to determine the target state of each roof fan according to the environment data, comprising: Comparing the engine room temperature with a plurality of preset temperature intervals respectively to determine the target temperature interval to which the engine room temperature belongs; Accessing a pre-set first reference table to determine a first reference state set of each roof fan corresponding to the target temperature interval according to the first reference table; wherein the first reference table is used to represent the corresponding relationship between different temperature intervals and the reference state of each roof fan; Comparing the hydrogen concentration with a plurality of preset concentration intervals to determine the target concentration interval to which the hydrogen concentration belongs; Accessing a pre-set second reference table to determine a second reference state set of each roof fan corresponding to the target concentration interval according to the second reference table; wherein the second reference table is used to represent the corresponding relationship between different concentration intervals and the reference state of each roof fan; Performing a set operation on the first reference state set and the second reference state set to obtain the target state of each roof fan.

3. The intelligent ventilation control system for the steam turbine building of a thermal power plant as claimed in claim 1 wherein, The roof fan control assembly comprises a plurality of fan control cabinets and a plurality of electric signal detection assemblies; The roof fan corresponds to the fan control cabinet and the electric signal detection assembly one by one, and the fan control cabinet is connected with the roof fan and the electric signal detection assembly respectively; The electric signal detection assembly is used to collect key electric parameters of the corresponding roof fan and send the key electric parameters to the fan control cabinet; The fan control cabinet is used to control the corresponding roof fan to operate according to the corresponding target state after receiving the first control instruction, and generate and send abnormal warning information to the central processor when it is determined that the key electric parameters are abnormal.

4. The intelligent ventilation control system for the steam turbine building of a thermal power plant as claimed in claim 1 wherein, Each circulating temperature regulating unit comprises a circulating water assembly, a cooling fan and an electric valve. The circulating water assembly is used for accessing lithium bromide chilled water or heating water, the cooling fan is connected to the main pipeline of the circulating water assembly through a branch pipe, and the electric valve is installed on the main pipeline of the circulating water assembly and used for controlling the water passage of the circulating water assembly.

5. The intelligent ventilation control system for the steam turbine building of a thermal power plant as claimed in claim 4 wherein, The environment data comprises a temperature of the machine room; According to the environment data and pre-obtained seasonal information, a target state of each circulating temperature regulating unit is determined, comprising: when the seasonal information is summer and the temperature of the machine room is higher than a first temperature threshold, the target state of each circulating temperature regulating unit is determined as accessing lithium bromide chilled water to the circulating water assembly, and the electric valve and the cooling fan are turned on until the temperature of the machine room is lower than a second temperature threshold, and the target state of each circulating temperature regulating unit is determined as turning off the electric valve and the cooling fan; when the seasonal information is winter and the temperature of the machine room is lower than a third temperature threshold, the target state of each circulating temperature regulating unit is determined as accessing heating water to the circulating water assembly, and the electric valve and the cooling fan are turned on until the temperature of the machine room is higher than a fourth temperature threshold, and the target state of each circulating temperature regulating unit is determined as turning off the electric valve and the cooling fan; wherein the first temperature threshold, the second temperature threshold, the fourth temperature threshold and the third temperature threshold decrease in turn.

6. The intelligent ventilation control system for a steam turbine building of a thermal power plant as claimed in claim 1 wherein, The steam engine room is also provided with a plurality of electric doors and windows, and the system further comprises an electric door and window control assembly; The electric door and window control assembly is connected to the central processor; The central processor is further configured to determine a target state of each electric door and window according to the environment data and the target state of each roof fan, and generate and send a third control instruction to the electric door and window control assembly according to the target state of each electric door and window; The electric door and window control assembly is configured to control each electric door and window to act according to the corresponding target state after receiving the third control instruction.

7. The intelligent ventilation control system for a steam turbine building of a thermal power plant as claimed in claim 6 wherein, The environment data comprises a pressure of the machine room and a hydrogen concentration; The central processor determines a target state of each electric door and window according to the environment data and the target state of each roof fan, comprising: comparing the pressure of the machine room with a preset pressure threshold to obtain a first comparison result; comparing the hydrogen concentration with a preset concentration threshold to obtain a second comparison result; determining a target deviation value according to the first comparison result and the second comparison result; determining an opening and closing state of each electric door and window according to the target deviation value; determining the number of roof fans in the target state of opening according to the target state of each roof fan; determining a target electric door and window in the opening and closing state of opening, and determining the opening degree of the target electric door and window according to the number of roof fans in the target state of opening; determining the target state of each electric door and window according to the opening and closing state of each electric door and window and the opening degree of the target electric door and window.

8. The intelligent ventilation control system for a steam turbine building of a thermal power plant as claimed in claim 7 wherein, determining a target deviation value according to the first comparison result and the second comparison result, comprising: If the first comparison result is that the machine room pressure is higher than the preset pressure threshold, and the second comparison result is that the hydrogen concentration is below the preset concentration threshold, then the target deviation value is obtained by subtracting the preset pressure threshold from the machine room pressure; If the second comparison result is that the hydrogen concentration is higher than the preset concentration threshold, then the target deviation value is obtained by subtracting the preset concentration threshold from the hydrogen concentration; If the first comparison result is that the machine room pressure is below the preset pressure threshold, and the second comparison result is that the hydrogen concentration is below the preset concentration threshold, then the target deviation value is set as a default value.

9. The intelligent ventilation control system for a steam turbine building of a thermal power plant as claimed in claim 7 wherein, According to the target deviation value, the opening and closing state of each electric door and window is determined, including: A third comparison table is retrieved, wherein the third comparison table is used to represent the corresponding relationship between different target deviation values and the opening and closing state of each electric door and window; According to the third comparison table, the opening and closing state of each electric door and window corresponding to the target deviation value is determined.

10. The intelligent ventilation control system for a steam turbine building of a thermal power plant as claimed in claim 1 wherein, The environment monitoring component includes a temperature monitoring device, a pressure monitoring device, and a hydrogen monitoring device; The temperature monitoring device is used to collect the machine room temperature in the steam turbine room, the pressure monitoring device is used to collect the machine room pressure in the steam turbine room, and the hydrogen monitoring device is used to collect the hydrogen concentration in the steam turbine room.

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